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RHYTHM. 
 
 BY 
 
 THADDEUS L. BOLTON, 
 
 Demonstrator and Fellow in Psychology, Clark University, Worcester, Mass. 
 
 Approved as a thesis for the degree of Doctor of Philosophy 
 at Clark University, Worcester, Mass. 
 
 Q. Stanley Hall. 
 
 (Reprinted from the American Journal of Psychology, Vol. VI. No. 2.) 
 
 PRESS OT F. S. BLANCHARD AHD COMPANY, 
 WORCESTER. 
 
 
3>fc 
 
 Gift 
 The University 
 
 ?2%'05 
 
RHYTHM. 
 
 By Thaddbus L. Bolton, 
 
 Demonstrator and Fellow in Psychology, Clark University. 
 
 Reprinted from The American Journal of Psychology, Vol. VI., No. 2. 
 
 Introduction. 
 
 Although experimental psychology began more than a 
 hundred years ago through the discovery of the personal 
 equation, it has as yet covered but a small portion of the field 
 of mental phenomena. The nature of sensation, the time- 
 relations of mental phenomena, memory, association, space 
 and time concepts have been carefully studied by many 
 eminent scientists. But the whole field of the emotions has 
 been practically a mare clausum for psychologists. Several 
 attempts to study and determine the nature of the simplest 
 aesthetic forms have been reported ; theories of pleasure and 
 pain, supported by some experimental observations, have been 
 advanced, but no serious attempt has been made to submit 
 the emotions to experimental investigation. Every psycholo- 
 gist recognizes the necessity of doing so and that it is the 
 most important field of mental phenomena, and that, until 
 psychologists can reduce the motions to some semblance of 
 order or more ultimate principles, experimental psychology 
 can be said to cover only a part of the field of mental life. 
 Every one is waiting for some one else to point out the way. 
 There seems to be a general feeling that when once an en- 
 trance has been effected, the greatest difficulty will have been 
 
2 BOLTON : 
 
 surmounted and the whole field will yield to experiment. In 
 a measure this is the true view to take, and yet certain of the 
 emotions are as distinctly separated from others as the whole 
 field is from that of the memory. 
 
 When the demand for such a study is so great, and students 
 are being urged to make a trial, that one who does attempt it, 
 though he fail, cannot be accounted rash. 
 
 The experimental study of rhythm which is to be presented 
 in this paper, is an attempt to push the lines of exact science 
 a little farther forward into a field that borders more closely 
 upon the field of aesthetics than any other that experimental 
 psychologists have tried. The attempt is to be made to re- 
 duce rhythm to a more fundamental activity of mind. The 
 pleasure that individuals take in the rhythmic flow of words 
 and sounds has been ascribed by one to the ' ' Unifying Ac- 
 tivity of the Feelings, ' ' by another to a " Sense of Order, ' ' 
 and by still another to ' ' The Feelings of Equality. ' 7 Such 
 explanations as these do not meet the question at all, unless 
 it can be shown that such activities or feelings are ultimate 
 facts of mind. If they are ultimate facts of the mind, it will 
 be necessary, in order to make the explanation complete and 
 valid, to show how they underlie other activities, for it is not 
 to be supposed that any fundamental activity will manifest 
 itself in a single phenomenon which bears no relation to 
 other phenomena. Such does not seem to have been done by 
 those who have offered explanations of the rhythms in speech, 
 and the problem remains just where it was taken up. To re- 
 gard rhythm as the manifestation or the form of the most 
 fundamental activities of mind, seems a clearer view and to 
 offer less difficulties than to regard it as an ultimate fact in 
 itself. The problem, then, is to show how and to what extent 
 it underlies mental activity, and, as preparatory to this, what 
 part it plays in physiology and nature. Is there not some 
 universal principle which is adequate as an explanation of 
 rhythm in general? 
 
 Ehythm is so universal a phenomenon in nature and in 
 physiological activity, and underlies so completely speech, 
 that I desire to call attention to some of its manifestations in 
 detail before presenting the experimental study. 
 
 Rhythms in Nature : — Natural phenomena very generally, 
 if not universally, take a rhythmic form. There is a periodic 
 recurrence of a certain phenomenon, sometimes accompanied 
 by others, going on continuously in all that pertains to 
 nature. Motion, whether in the broader field of the universe 
 or upon the earth, is very generally periodic. Light, heat, 
 sound, and probably electricity, are propagated in the form of 
 waves. A falling body does not follow a straight line, 
 
RHYTHM. 3 
 
 neither does a rifle bullet describe a simple curve which is the 
 resultant of the combined forces of gravity and the initial 
 velocity. Mr. Herbert Spencer has treated this subject in 
 his " Principles of Philosophy " at considerable length, and 
 has left but little that can be said here. Although he does 
 not say so in so many words, he seems to hold that it is the 
 only possible form of activity ; continuous motion is an im- 
 possibility. 
 
 7 The cosmic rhythms, however, are the most fundamental and 
 important of natural phenomena. They may be shown to 
 underlie in a measure and be the cause of many other rhythms 
 in plant and animal life. The regular alternation of light and 
 darkness due to the rotation of the earth upon its axis is tbe 
 most striking rhythm in the cosmos. The two periods of 
 light and darkness constitute a unit — the day — which re- 
 mains always the same in length. Days are grouped into 
 months by the revolution of the moon about the earth, and 
 into years by the revolution of the earth about the sun. 
 These periodic changes have had a tremendous influence 
 upon animal and plant life, and have stamped their impress 
 upon all living organisms in the most striking manner ; 
 some, however, upon certain organisms more than upon others. 
 In the vegetable kingdom some plants show a daily growth 
 and repose; their flowers bloom in the morning and close 
 before the evening. Some turn their petals towards the sun, 
 and make a daily revolution in order to keep them so. In 
 certain latitudes all vegetation shows normal periods of 
 growth and fruitage which are not necessarily cut short or 
 lengthened by early or late frosts. It requires a certain time 
 for development without regard to the character of the season. 
 The lunar period is known to influence the blooming of 
 flowers. A species of Chinese roses blooms with a monthly 
 regularity during the season. 
 
 The influence of these cosmic rhythms is not less upon the 
 animal kingdom. The daily rhythm causes the daily periods 
 of sleep and waking, from which no terrestrial creatures of 
 the higher types are exempt. The periods of sleep and wak- 
 ing are not determined by the effect of light and darkness as 
 are the movements of many plants. The lunar period has had 
 a far-reaching effect upon animal creatures, especially as re- 
 gards reproduction and the nervous system. The periods of 
 gestation and the recurrence of heat and menstrual flow in 
 both human beings and animals bear a very close and strik- 
 ing relation to the lunar period. The period of gestation in 
 some lower mammalian animals is one month. In the higher 
 forms it is a certain number of months. The time of incuba- 
 tion is with some species of fowls a month, but it seems to 
 
4 BOLTON : 
 
 conform in general to a period of days which is a certain 
 multiple of seven, seven being one-fourth of a lunar month. 
 Fourteen, twenty- one and twenty- eight days are very common 
 periods of incubation. The year exercises a still wider in- 
 fluence upon the animal kingdom. The normal life of most 
 species of insects terminates in a single year. The frog 
 becomes nervous and irritable with the approach of spring, 
 although the conditions under which it is kept may not 
 change. The polar bear goes into hibernation, even though 
 he has not made the proper preparation in the way of a store 
 of fat. The migrations of birds are not necessarily prompted 
 by the signs of approaching winter. Animals breed generally 
 in the spring — a fact which cannot find sufficient explanation 
 in the influence of a warmer temperature. It has been fairly 
 established that growth is more rapid during the summer 
 months. 
 
 Although we find that these cosmic rhythms have stamped 
 themselves upon the organism more or less permanently, 
 they have wielded a far mightier influence upon the minds of 
 men. Among primitive peoples that were rich in imagina- 
 tive power, they have given rise to the most elaborate and 
 beautiful systems of mythology and worship that the world 
 has ever seen. It is a common speculation in childhood 
 that, endowing animals at birth, as children do, with rational 
 intelligence, but with a total lack of experience, the young 
 creature must be driven to strange thoughts and speculations 
 when the first light of day breaks in upon him, or when dark- 
 ness approaches for the first time. What can be the thoughts 
 of such a creature when he experiences the change of seasons 
 or the first snow storm 1 ? No objects that are presented to 
 the child so stimulate his thought and become such food for 
 his fancy as the heavenly bodies and cosmic phenomena. 
 Many of their minds are filled with myths about the stars 
 that are as original and beautiful in conception, though lack- 
 ing in detail, as much of the Greek mythology. 
 
 The recurrence of the day of the year upon which some 
 event has happened is commemorated as a day of joy or 
 sorrow according to the nature of the event. All national 
 and religious festivals recur once a year. Among primitive 
 peoples worship takes place always at the same time of day 
 or year, and the same might be said of most enlightened 
 people. There seems now, and always has seemed, a 
 peculiar appropriateness in performing certain duties at the 
 same time of day or year, although it does not necessarily 
 depend upon the nature of the weather or of the event. The 
 Christian Sabbath and other religious festivals, both savage 
 and civilized, find their origin in the nature worship of the 
 sun and the moon. 
 
RHYTHM. 5 
 
 There are still other rhythms in the cosmos which seem to 
 exercise an influence upon mankind. Sun spots make their 
 appearance in great numbers once in about eleven years, and 
 the attempt has been made to connect these with great 
 financial disasters and religious awakenings which seem to 
 recur in the same time. The social customs of the race 
 show similar changes, which may prove to have some con- 
 nection with sun spots. The coincidence warrants an in- 
 vestigation and allows speculation. 
 
 Upon the morbid side science has made discoveries of the 
 most striking character. Even from the earliest times a 
 periodicity has been observed in certain forms of insanity 
 and in other mental diseases. These have been confirmed by 
 later investigations. 1 Both crime and suicide show a 
 periodicity which corresponds with the year, and another 
 which corresponds to the larger period of sun spots. 
 
 Physiological Rhythms : — ~Ro fact is more familiar to the 
 physiologist than the rhythmic character of many physio- 
 logical processes. In physiology it means the regular alter- 
 nation of periods of activity and periods of repose or of lesser 
 activity. The term is also applied to any alternation of 
 activity and repose, whether it is regular or not. These 
 periods of activity and intervals of repose may succeed one 
 another at very small intervals of time, as in the case of a 
 clonic contraction of the muscle, or at very much greater 
 intervals, as in the case of sleep and waking, or better still, in 
 the periods of growth in children. Several of the most vital 
 and important bodily activities are distinctly rhythmical, and 
 will serve as types of all physiological rhythms. Of these, 
 might be mentioned the pulse, respiration, walking and 
 speech. The first two are involuntary actions, which in the 
 very nature of the organism must be more or less rhythmical. 
 Such actions are controlled by the lower nerve centres, and 
 the organs concerned in them are connected in a reflex arc 
 with these nerve centres. Habits are in the nature of invol- 
 untary actions. Of these, walking and speech are the most 
 important and are true types of rhythmical activity. In each 
 there is a series of coordinated muscles in which the contrac- 
 tion of one is the signal for the contraction of the next in the 
 series, the last acting as a stimulus to the first. 
 
 Independent of the regular beat of the heart and forming a 
 kind of higher grouping of these beats, the arteries undergo 
 continuously rhythmical contractions and dilations of their 
 
 1 Dr. Koster, "Uber die Gesetze des periodischen Irreseins und 
 verwandter Nervenzustande." Bohn, 1882. 
 Dr. Ludwig, " Periodischen Psychosen." Stuttgart, 1878. 
 
6 BOLTON : 
 
 walls, now increasing and now decreasing the blood supply. 
 These may be observed with a glass in the arteries of a frog's 
 foot or a rabbit's ear, occurring about once a minute. They 
 may be made to cease entirely by cutting off the nerves going 
 to these organs. 1 These arteries are controlled by the vaso- 
 motor system, and the rhythmic contractions of the arteries 
 seem to indicate a rhythm in the activity of the nerve 
 centres. As we shall see later, there is some ground for 
 believing that all nervous action is rhythmical. Eegular 
 contractions occur in the heart of some animals after they 
 have been removed from the body, and are found to be due 
 probably to the presence of nerve ganglia in these organs. 2 
 The effect of deficient arterialization upon the vaso- motor 
 system is to cause a rise in the curve of blood pressure. 
 This curve, then, shows certain undulations, which have 
 been called Traube-Hering curves, from their discoverer. 
 This result is obtained by cutting the vagi nerve and 
 stopping respiration. The venus blood then acts as a 
 stimulus upon the vaso-motor centres in the medulla, 
 which causes these rhythmic movements. "This rhythmic 
 rise 3 must be due to the rhythmic contraction of the arteries, 
 and this is caused by a rhythmic discharge from the vaso- 
 motor centres." " The vaso-motor nervous system is apt to 
 fall into a condition of rhythmic activity." A similar 
 phenomenon has been thought to be observed in regard to 
 the spinal cord. 
 
 When the spinal cord 4 of a dog, cat or rabbit was cut, 
 rhythmical contractions of the sphincter ani and of the 
 vagina appeared. These contractions vary in number, but 
 are generally about twenty per minute for the sphincter ani 
 and four per minute for the vagina. The centre for these 
 contractions was found to be in the spinal cord, about the 
 level of the sixth and seventh lumbar vertebrae in rabbits and 
 of the fifth lumbar vertebra in dogs. 
 
 1 Foster's "Physiology," 6th Ed. p. 307. 
 
 Dr. Ellis, working under Dr. Bowditch, has studied these contrac- 
 tions in the web of a frog's foot with the microscope. He says that 
 cutting the sciatic nerve does not stop them, and concludes that 
 they are due to peripheral centres, unless he be allowed to suppose 
 that automatic contractility is a property of smooth muscle tissue. 
 Plethysmographic and vaso-motor experiments with frogs. Jour, 
 of Phys. Vol. VI. No. 6, p. 437. 
 
 2 Foster's "Physiology," 6th Ed. p. 357. 
 3 Foster's "Physiology." 6th Ed. p. 622. 
 
 4 Isaac Ott, "Observations upon the Physiology of the Spinal 
 Cord." Studies from Biol. Lab. at Johns Hopkins University. 
 No. II. 
 
RHYTHM. 7 
 
 Fatigue shows itself to be a rhythmical process. Dr. 
 Lombard 1 worked upon the flexor muscle of the second 
 finger. After contracting the muscle several times, lifting 
 each time a weight, he gradually lost the power of further 
 contraction, but he continued to make the effort at regular 
 intervals of two seconds. In a short time he regained his 
 former power, which he maintained for several minutes, and 
 then gradually lost it again. About five periods of alter- 
 nating loss and recovery took place in twelve minutes. By 
 variations in the methods of experimentation, the different 
 factors are eliminated, and he is able to conclude that the 
 centre of voluntary control is unaffected, but that this 
 periodicity is dependent upon " alterations which take place 
 in some of the mechanisms between the areas of the brain 
 originating the will impulses and the centrifugal nerves." Dr. 
 Hodge 2 found that when he stimulated the spinal ganglia of a 
 cat continuously with an interrupted current, no change 
 of the cell took place. When he applied his interrupted 
 current for a quarter of a second and allowed the cell to rest 
 three-quarters, a change took place in the nucleus of the cell. 
 These experiments are inconclusive, as in the first case the 
 animal was given curari and in the second it was not. Dr. 
 Burgerstein 3 tested a number of school children by their 
 ability to multiply and add figures for four successive periods 
 of ten minutes, with five minutes' interval between the 
 periods of work. During the third period there was a 
 marked falling off in the amount of work accomplished and 
 an increase again during the fourth period. He argues that 
 the pupils became fatigued during the first two periods, and 
 that the third was a period of recovery, since the normal 
 amount of work was shown again in the fourth. 
 
 The secondary rhythm observed in the circulation occurs 
 also in respiration. Under ordinary circumstances respira- 
 tion follows a rhythm of about fifteen or twenty a minute. 
 During certain diseases and sleep a secondary rhythm — 
 Cheyne-Stokes 4 curves — appears in respiration. The respira- 
 tory movements decrease in depth until they disappear entirely. 
 After an interval of a few seconds a slight movement occurs. 
 This is followed by others, which increase in strength until 
 they become normal and sometimes abnormally strong. Two 
 explanations are offered : first, a waxing and waning in the 
 nutrition of the respiratory centres, and second, a rhythmic 
 
 1 Warren P. Lombard, M. D., "Effect of Fatigue upon Muscular 
 Contractions." Amee. Jour, op Psy. Vol. III. 
 
 2 " Microscopical Study of Changes due to Functional Activity in 
 Nerve Cells." Jour, of Morphology, Vol. VII. 
 
 3 Die Arbeitskurve einer Stunde. Zeitschr.f. Schulges. IV. 9, 10. 
 
 * Foster's " Physiology," 6th Ed. p. 605. 
 
8 BOLTON : 
 
 increase and decrease in the inhibitory impulses playing upon 
 the centres. The latter explanation is favored. This, 
 however, simply assigns the rhythmic action to some other 
 centre and does not explain the phenomenon. A certain 
 amount of secondary rhythm takes place in the breathing of 
 hibernating animals. Bespiration appears almost to cease 
 and then to start again, but it is generally slower during 
 hibernation. 
 
 Growth appears to take place rhythmically. Distinct 
 periods of activity and rest occur in the embryonic develop- 
 ment of some species that have been observed. This has 
 been seen in the segmentation of pulmonates' eggs. 1 It is no 
 less true of the amblystoma. In these the periods of activity 
 last from five to fifteen minutes, and are succeeded by inter- 
 vals of repose lasting about forty-five minutes. The activity 
 of the protoplasm offers a resistance which must be overcome 
 by the energy arising from the assimilation of the granular 
 food material, which disappears as development proceeds. 
 During the period of repose the energy is accumulating from 
 this assimilation, which, when it becomes sufficient, overcomes 
 the resistance, and activity sets in. This is taken to be a type 
 of physiological and nervous activity, which will serve to 
 explain certain phenomena of rhythm. This rhythm in 
 growth, which is observed in the embryonic development, is 
 characteristic of the physical and mental growth of children. 
 For several years previous to puberty, great increase in 
 stature is observed, puberty itself being a period of slow 
 growth. From fifteen to eighteen is another period of growth, 
 in which the full stature is generally reached. The mental 
 character of children shows also periods of activity and 
 repose. 2 The bright child becomes dull and the tidy slovenly. 
 The leader in the athletic sports is now lazy and moping. 
 Memory is dow predominant, and now reason. The child 
 passes from one form of activity to another. The line of 
 development goes zigzag to its goal. 
 
 Other examples of involuntary action might be mentioned. 
 These are the peristaltic contractions of the intestines, labor 
 pains, the recurrence of heat and of the menstrual flow, and 
 the secretions of the digestive cell. In these cells the secre- 
 tions are kept up for about six hours, when a period of repose 
 of about twenty-four hours follows. 3 
 
 1 W. K. Brooks, " Fresh Water Pulmonates." Studies from 
 Biol. Lab. at Johns Hopkins Univ. Vol. II. 
 
 2 G. Siegert, ''Die Periodicitat in der Entwickelung des Kindes- 
 natur." 
 
 3 J. M. Langley and Sewell, "Histology and Physiology of Pepsin- 
 forming Glands." Phil. Trans. Vol. CLXXII. pp. 663-711. London, 
 1882. 
 
RHYTHM. 9 
 
 From this review it may be safely said that nervous action 
 in general, and especially of the lower and vaso-motor centres, 
 is rhythmical. This form of activity results from the resist- 
 ance which the nervous substance offers to a stimulus. A 
 certain amount of energy is necessary to overcome this 
 resistance. This fact is brought out by the experiments of 
 Helmholtz 1 and Sterling upon the summation of stimuli. 
 Helmholtz found that when he stimulated a nerve going to a 
 muscle by a submaximal stimulus and then added another 
 stimulus at any time afterward within four seconds, he ob- 
 tained a contraction. If he used a maximal stimulus in the 
 first place and then added another stimulus during the latent 
 period, it produced no effect upon the contraction due to the 
 first stimulus. But if the second stimulus was added after 
 the latent period, the effect was a greater contraction than 
 that which followed the first stimulus alone. Submaximal 
 stimuli 2 following one another, even as slow as one per second, 
 will produce a contraction after a time. As the frequency of 
 the stimulus increases, the effect is much more marked. It 
 is much better to increase the frequency of the stimulus with- 
 out increasing the strength than to increase the strength 
 alone. Sterling adds further that all muscular and nervous 
 action is due to summated stimuli — a conclusion that denies 
 the possibility of contractions due to one instantaneous shock 
 or at least does not explain them. Dr. Ward 3 determined 
 that between the rates of .4 sec. and .03 sec. a contraction 
 always followed a given number of stimuli. Above and be- 
 low these limits the number might vary. In the same line is 
 the work of Drs. Kronacker and Hall. 
 
 It has been held by Sterling and others that when a stimu- 
 lus is applied directly to the cortex, no matter what the rate, 
 the brain sent out rhythmic impulses always at a constant 
 rate. Dr. Limbeck 4 conducted a series of experiments upon 
 the brain and spinal cord, in which he finds that the brain 
 and spinal cord send out just as many impulses as they 
 receive. Faster rates than thirteen shocks per second for 
 the cortex and thirty-four for the cord, gave smooth curves. 
 
 1 Helmholtz, "Berichte der Berliner Akad." 1854, p. 358. 
 
 2 W. Sterling, " Uber die Summation electrischer Hautreize." 
 Berlin. Berichte d. Sachsgelschaft d. Wissenschaft. December, 
 1874, p. 372. 
 
 3 Dr. Ward, " Uber die Auslosung von Reflexbewegungen durch 
 einer Summe schwacker Reize." Archiv fur Anatomie und Physiol- 
 ogic 1880, p. 72. 
 
 Hugo Kronacker und G. Stanley Hall. Die willkurliche Muske- 
 laction. Archiv fiir Anatomie und Physiologie, 1879. 
 
 4 Dr. R. U. Limbeck, " Uber den Rhythmus centralie Reize." 
 Archiv fiir experimentale Pathologic Bd. XXV. H. 2. 
 
10 BOLTON : 
 
 The difference between the rates for cortex and cord is worthy 
 of note in consequence of the close correspondence of the 
 number of shocks for the cortex and the rate of the most 
 rapid voluntary control ; while involuntary and clonic con- 
 tractions which find their seats in the lower centres and in 
 the cord may be much faster. In this connection the atten- 
 tion of the reader is called to that portion of the experimental 
 study in which the rate of clicks at which rhythmical grouping 
 ceases is set forth. It is not far from ten a second. This is 
 also near the lowest rate at which air vibrations give the 
 impression of a musical tone. 
 
 The theory of summated stimuli which was advanced by 
 Wundt, and which is generally accepted, is based upon the 
 resistance which a central cell offers to a stimulus. The in- 
 coming stimulus is not communicated directly to the cell. 
 The afferent nerve does not terminate in the cell, but breaks 
 up into branches, which form a kind of envelope about the 
 cell. The efferent nerve takes its rise in the nucleus of the 
 cell and proceeds towards the periphery. If the stimulus is 
 weak, it does not penetrate through the surface of the cell to 
 the nucleus, but only part way. It sets up a kind of disturb- 
 ance around the surface of the cell and, should another stimulus 
 follow before the disturbance has subsided, it adds to the 
 effect already produced. Eepeated stimuli still further in- 
 crease the disturbance until it penetrate to the nucleus of 
 the cell, when it causes the cell to discharge into the efferent 
 nerve. This serves very well for summated stimuli, but 
 other phenomena of just the opposite nature require ex- 
 planation. There are the soothing effects of slow and gentle 
 stroking or patting, such as hypnotizers and nurses use upon 
 their subjects. The general fact seems to be that the stimu- 
 lus must not rise much above the threshold, and be sufficiently 
 slow, that there shall be no summation. As we shall see later, 
 any repeated stimulus tends to take the form of a muscular 
 movement accompanying it. If this stimulus becomes 
 gradually slower, it leads finally to the concept of rest, and 
 being accompanied by muscular movements, these movements 
 must finally cease. Increased quietude follows the slowly 
 decreasing movements, until before a great interval of time 
 has elapsed the body falls into a state of rest. The stimulus 
 must in any case be sufficient to command the attention of 
 the subject to the exclusion of the disturbing effects of other 
 stimuli coming from without and from the involuntary pro- 
 cesses of the body. Let us return now to the nerve cell, to 
 find if there are any processes going on which will throw 
 light upon the problem. A weak stimulus is continually 
 playing upon the cell from without, but never rises sufficiently 
 
RHYTHM. 11 
 
 in strength to penetrate beyond the periphery of the cell or 
 in rapidity to bring about a summation. The effect of each 
 stimulus subsides before the following one reaches the cell. 
 The peripheral area must soon become fatigued so that it is no 
 longer able to respond to the stimulus, and yet it is sufficiently 
 strong to command the attention in so far as to distract it 
 from other stimuli coming from within. This is the condition 
 of quietude in the cell which is manifest in the muscle. 
 
 Attention and Periodicity : — The most casual observer will 
 discover that his attention is discontinuous and intermittent. 
 It manifests itself in a wave-like form. It is a series of 
 pulses. The mind does not rest for any length of time upon 
 a single object. New phases and relations must continually 
 appear, or the object is dropped, that another may be taken 
 up. ' ' No one can possibly attend continuously to an object 
 that does not change." 1 This process has been described as 
 a "fly and perch." Charles Pierce says in his "Philosophy 
 of Attention" that there is "no continuum." This periodicity 
 in attention has been observed by Helmholtz 2 with the 
 stereoscope and commented upon at considerable length. 
 The phenomenon is called retinal rivalry. Mr. T. Eeed 3 re- 
 cords some observations which he made in combining two 
 stereoscopic views, which were ruled, the one with vertical, 
 and the other with horizontal lines. He finds that the whole 
 field will be occupied for a time with one view, and then this 
 gives way for the other, which lasts an equal time. They seem 
 to change without voluntary effort and even in spite of one's 
 efforts to keep one view in the field. The full time for a 
 change from one to the other and back again is from twelve 
 to sixteen seconds for different subjects. The pulses of at- 
 tention, however, seem to succeed one another at much 
 shorter intervals. Two seconds seem a long time to hold 
 any object which has no relation before the attention. James 
 says : " There is no such thing as voluntary attention sus- 
 tained for more than a few seconds at a time." Does it not, 
 then, seem reasonable that during each wave or pulse of 
 attention only one undivided state of consciousness can arise? 
 The waxing and waning of attention seem to mark a change 
 from one object of consciousness to another. The object of 
 the state may be very complex, but it stands as a unit in 
 consciousness. The problem of the relation of the parts of 
 the object by which a great many may be allowed to stand as 
 
 1 James, " Psychology," Vol. I. p. 420. 
 2 " Physiologische Optik," Sec. 32. 
 ■" Nature," August 1, 1887. 
 
12 BOLTON : 
 
 a unit in consciousness and be grasped in a single state, is of 
 the most vital importance, but it must be deferred until later, 
 when the normal period of a wave of attention will also be 
 discussed. 
 
 Rhythmic Speech: — The most distinguishing, and in many 
 respects the most important, function of the human body is 
 vocal utterance and articulate speech. Being an involuntary 
 and habitual function in a large measure, it might be expected 
 upon a priori grounds to be rhythmical. Speech becomes 
 rhythmical not simply by sounds succeeded by pauses, but 
 also by the regular recurrence of strongly accented sounds in 
 a series. Aside from the simplest shout or exclamation of 
 joy or pain, all vocal utterances are primarily rhythmical. 
 Every word that contains more than one syllable consists of 
 strong and weak syllables. These accents occur upon every 
 other syllable in varying intensity, or at most the accented 
 syllables are separated by two unaccented syllables. As 
 regards vocal utterances, they can be considered from four 
 different aspects — their regular succession, intensity, pitch 
 and quality. The problem in a philosophical treatment of 
 rhythmic speech is to determine the value of these properties 
 of sound as unifying elements in a rhythmical production. 
 It will be necessary first to inquire which is the most funda- 
 mental, and secondly, where each enters and the part it plays 
 in the development of literature. We must seek also other 
 unifying principles, if such there be. Of these, we might 
 now mention the logical meaning of words — the theme — and 
 aesthetic forms. As we are concerned in speech in so far only 
 as rhythmical effects are aimed at, we shall speak only of 
 poetry. By what coordinations and subordinations of sounds 
 with respect to their properties and meanings is the whole 
 structure of the poem held together ? It is the same problem 
 which Plato discussed as the one and the many. Kant put 
 the same question by asking how the mind made a unity out 
 of a manifold. We have to ask how the mental span becomes 
 so enormously increased as to grasp such a poem as Words- 
 worth's " Intimations of Immortality from the Eecollections 
 of Childhood," or Milton's " Paradise Lost." How is the 
 carrying power of the mind increased to such an extent? 
 The answer is to be found in the fact that unities are formed 
 out of the simplest elements of speech by coordinating some 
 with others in respect to their time relations ; secondly, 
 unities are formed of unities by subordinating them with 
 respect to their intensities, and sometimes, their time values; 
 thirdly, by coordinations and subordinations with respect to 
 intensities and qualities, higher unities still are formed ; and 
 
RHYTHM. 13 
 
 fourthly, by coordinations and subordinations with respect 
 to theme and aesthetic forms, the greatest unities are accom- 
 plished. In the first place vocal utterances are related as 
 regards time, that is, the same sound may recur at regular 
 intervals, in which case the series thus formed might be 
 termed a rhythmic series — a series which may become 
 rhythmical. In the next place this series might be made up of 
 louder and weaker sounds alternating with each other. The 
 series would then be composed of groups of sounds and might be 
 called a rhythmical series. This is a rhythm in speech. If 
 now the louder sounds in each group were given different 
 intensities, these smaller groups might be brought into larger 
 groups still. In this way the mental span may be made to 
 extend itself over a very large number of simple impressions. 
 The principle is very clear, and one will see at a glance that 
 if intelligible sounds were used and qualitative changes em- 
 ployed, the mental span might be almost indefinitely extended. 
 The carrying power of the mind, however, does not rest 
 wholly in any case upon a single fact, if we make the excep- 
 tion that vocal utterances must be carefully timed in a 
 rhythmic series. Quality and pitch changes accompany 
 changes in intensity, so that the subordination of one sound to 
 another and their consequent unification with respect to 
 intensity is always dependent upon pitch and quality changes 
 as well. For this reason it is impossible to treat each 
 properly by itself. 
 
 Time-relations : — In order for vocal utterances to form a 
 rhythmic series, they must occur at regular intervals of time 
 which cannot exceed or fall much below certain limits. We 
 may, however, upon the analogy of physiological rhythms, re- 
 gard a series of sounds recurring at stated intervals as a rhyth- 
 mical series, and also regard the recurrence of accented sounds 
 as forming a secondary rhythm out of the primary. This is 
 carrying the rhythmical idea farther than has been customary, 
 and while it is more nearly correct, it would not be generally 
 understood. The question of the time values of vocal utter- 
 ances for rhythmical purposes cannot be answered upon an 
 examination of poetry itself. Although the Greeks and 
 Eomans assigned exact values to all syllables in their lan- 
 guage, there is reason for believing that such values did not 
 arise naturally, but were assigned when they began to specu- 
 late upon poetry. No such relations exist among the sylla- 
 bles of modern languages, and in English they never did. 
 We must then dismiss the subject of time and its significance 
 and revert to it as the subject permits. 
 
14 BOLTON : 
 
 Intensity of Sounds: — The mind accomplishes its first 
 real unification of sounds by subordinating them with respect 
 to their intensities. A rhythm in speech means a series of 
 groups of sounds. Each group may contain two or more 
 sounds, generally not more than four. Two sounds, one 
 strong and one weak, the one succeeding the other in time, 
 cannot give an idea of a rhythm, but two groups of two 
 such sounds certainly can. This being the simplest possible 
 rhythm, we should expect that it would be the earliest 
 form in which literature appeared. Since we have not 
 probably any extant specimens of the first literary productions, 
 for they were not committed to writing, we must judge from 
 those which have come down to us from later periods, and 
 from the literature of primitive peoples and of children, 
 what the earliest form was. In this way it has been proved 
 that our surmise, which was made upon a priori ground 
 simply, is correct. The oldest extant specimens of English 
 poetry are generally composed of verses of two sections, 
 which are separated by a pause in the middle. Each section 
 generally contains four, sometimes six, syllables, two of 
 which are unaccented and two accented. The first section 
 was emphatic and corresponded to the accented syllable in 
 the smaller division ; the second section received less stress 
 and was less important. The two formed a kind of balance 
 structure, in which the first section contained a rise and the 
 second a fall. 
 
 helle heafas: hearde nithas. 
 wer leas werod: waldend sende. 
 graes ungrande: gar secg theahte. 1 
 
 " Our Anglo-Saxon 2 poems consist of certain versicles, or, 
 as we have hitherto termed them, sections, bound together in 
 
 pairs by the laws of alliteration For the most part 
 
 these sections contain two or three accents, but some are 
 found containing four, or even five. The greater number of 
 these sections may be divided into two parts, which generally 
 
 fulfill all the conditions of an alliterative couplet " 
 
 These are the rules that Guest gives according to which the 
 elementary sections were constructed : 1. " Each couplet of 
 adjacent accents must be separated by one or two syllables 
 which are unaccented, but not by more than two." 2. u No 
 section can have more than three or less than two accents. " 3. 
 ' 'No section can begin or end with more than two unaccented 
 syllables." " When the accents of a section are separated 
 
 1 These lines are copied just as they appear in Guest's "His- 
 tory of English Rhythms," p. 189. 
 
 2 Guest's "History of English Rhythms," p. 158. 
 
RHYTHM. 15 
 
 by two unaccented syllables, the rhythm has been called 
 triple measure ; and the common measure, when they are 
 only separated by a single syllable." The greater propor- 
 tional number of accents makes the movement slower, and 
 adapts the measure for more solemn and graver subjects. 
 The triple measure is more suited to lighter themes. The 
 verse of the common measure is made more energetic by be- 
 ing begun and closed with accented syllables. They are 
 abrupt when too short, and become feeble when too long. 
 There was considerable variety of rhythm as early as the 
 fifth century, ' ' as there certainly was in the seventh century, 
 when Csedmon wrote." 1 "It is, however, probable that the 
 rhythms were of a simpler and of a more uniform character. ' ' 
 .... " Most of the alliterative couplets have only four 
 accents — very few, indeed, have so many as six." 
 
 The phenomenon of accompanying the changes of intensity 
 in a series of sounds with muscular contractions, led to the 
 early association of dancing with musical and poetical 
 recitation. Indeed, if we accept the current theory of the 
 origin of language as arising during the celebrations of 
 victory, dancing precedes even language. Just as an 
 animal jumps and frisks about as an expression of pleasure 
 at seeing his master, so our ancestors danced for joy over a 
 victory, or in the worship of their deity. They emitted cer- 
 tain vocal utterances in company with the tramping of the 
 feet, which in time came to have definite meanings and also 
 took on the rhythm of the dance. This rhythm was scarcely 
 more than the simple swaying of the body or the lifting of 
 one foot and now the other. Variations in the dance might 
 occur either in taking several steps forward and then several 
 backward, or to the right and to the left. These variations 
 would produce corresponding effects in the vocal accompani- 
 ment. The step of one foot would be stronger and a more 
 intense sound made to correspond to it. In the same way 
 either the forward or backward movement would become the 
 more important and give rise to the distinction of thesis and 
 arsis of the verse. Further groupings of the verses might 
 take place in the same way. The two-rhythm was appar- 
 ently the prevailing rhythm in the history of our language, if 
 not in some others. The most common foot in our literature 
 of all times, and a very common foot in the Greek literature, 
 consisted of two syllables ; two feet entered into the section, 
 and two sections formed an alliterated couplet or verse. It 
 is the simplest possible rhythm, and corresponds to the leg- 
 pendulum with which the language was so intimately asso- 
 ciated in its earlier history. 
 
 1 Guest's "History of English Rhythms," p. 169. 
 
16 BOLTON : 
 
 Noire 1 believes that language took its rise in the concerted 
 action of many persons. In this way the individual finds 
 that what belongs to him is the common character of others. 
 Such utterances as "hi-ho" are taken to be the first begin- 
 nings of language, and they originate during concerted action. 
 Any sound that is to become intelligible must first be ex- 
 perienced in company and then by the individual alone. But, 
 as the example shows, such utterances are rhythmical. 
 Here it is the rhythm of heaving sails or anchor, which is 
 seen among sailors. 
 
 Variations in the number of syllables to the accent would 
 be a necessity as a relief from the monotony of two syllables 
 to the accent, and so, too, the number of accents to the sec- 
 tion would be increased on account of the abruptness of the 
 doubly accented section. Taine 2 in speaking of early Saxon 
 poets says : ' ' His chief care is to abridge, to imprison 
 thought in a kind of mutilated cry." "They (Saxons) do 
 not speak, they sing or rather shout. Each little verse is an 
 acclamation which breaks forth like a growl. Their strong 
 breasts heave with a groan of anger or of enthusiasm. A 
 vehement or indistinct phrase or expression rises suddenly, 
 almost in spite of them, to their lips." After the people be- 
 came settled down in their new homes, they lost the ruder and 
 rougher characteristics, and such wild outpourings would be 
 no longer suited to their milder spirits. The changes that 
 took place in the development of our literature are due in 
 some measure to the change in the life and habits of the 
 people. 
 
 There still remain in our poetical compositions certain 
 evidences of some, at least, of the stages through which our 
 poetry has passed. The choruses in many of our hymns are 
 still made up of non- sense syllables. Irish melodies and 
 popular songs retain this feature. Children's poetry — by 
 that I refer to such poetry as they enjoy and recite for their 
 own amusement — has a large element of purely unmeaning 
 sounds in it. Savage dances are often accompanied by 
 recitations in which no meaning has been discovered. Again, 
 savages and children are frequently found repeating for their 
 own amusement a series of non- sense syllables in rhythmical 
 form. The accents are very strongly marked, and frequently 
 enforced by alliteration. The incoherent chatter of a maniac, 
 or the sound of a foreigner speaking his language to one who 
 is unacquainted with the language, is distinctly rhythmical. 
 It is more like a chant, and children frequently remark upon 
 
 1 Ludwig Noire, " Max Miiller and the Philosophy of Language." 
 
 2 Taine, " Introduction to the History of English Language." 
 
EHYTHM. 17 
 
 it. It appears, then, that vocal utterances which are kept 
 up for a considerable time fall into a rhythmical form. Such 
 being the natural tendency of speech, it would conform itself 
 to any rhythm with which it might be associated, and as vocal 
 utterances were always accompanied by the dance, it would 
 take on the rhythm of the dance, which in its earliest forms 
 we have seen reason to believe was the leg-pendulum. 
 
 The poetry of children shows a character very similar to 
 early English poetry. It consists often of a two- section verse 
 which is strongly alliterated, and in which the rhythm is 
 perfectly clear. The familiar incantation rhyme shows this 
 characteristic very well. 
 
 Sticks and stones 
 May break my bones, 
 But names will never hurt me. 
 
 Again, 
 
 Jack and Jill 
 
 Went up the hill 
 To fetch a pail of water; 
 
 Jack fell down 
 
 And broke his crown 
 And Jill came tumbling after. 
 
 At the beginning of each couplet there is wanting one 
 syllable. Their poetry is usually accompanied by marching 
 or by clapping of the hands, so that they require an accented 
 syllable at the beginning. The verse is, then, an alternation 
 of accented and unaccented syllables ; occasionally only two 
 unaccented syllables occur between two accents. We have 
 in the first couplet what was found to be a prominent 
 characteristic of early English poetry. 
 
 E. B. Taylor in his ' 'Anthropology' ' asserts that while meter, 
 and by that he means lines regularly measured in syllables, is 
 an evidence of civilization, one of its earliest developments is 
 matched and balanced sounds. The Australian savage sings 
 at the end of his verse, ' 'A bang ! A bang ! ' ' Certain of the 
 North American Indians sing in choruses, u N yah eh wa! 
 Nyah eh wa!" The chorus of a New Zealand song is 
 " Ha-ah, ha-ah, ha-ah, ha!" A feature extremely common 
 in barbaric song is a refrain of generally meaningless sylla- 
 bles. Guest, 1 speaking of our early poetry, says, "I have 
 hazarded the opinion that these short, abrupt and forcible 
 rhythms were the earliest that were known to our language. 
 They are such as would naturally be prompted by excited 
 feeling, and well fitted for those lyrical outpourings which 
 form the earliest poetry of all languages." The abruptness 
 
 Quest's "History of English Rhythms," p. 365. 
 
 2 
 
18 BOLTON : 
 
 is felt by children, so that not more than a single couplet 
 appears without the intervention of a different kind of verse. 
 Shakespeare 1 adopted this measure in his descriptions of 
 fairyland, and it is now become the fairy dialect of the 
 English language. 
 
 Qualities of Sounds : — Qualities of sounds are quite as 
 important as unifying elements as their time and intensity 
 relations, and were quite as early regarded. This is mani- 
 fest from the frequent recurrence of the same sound at the 
 beginning of Anglo-Saxon and Germanic verses. This is 
 alliteration. The two sections of the verse, while contrasted 
 in intensity, were coordinated by the recurrence of the same 
 sound. The origin of alliteration is involved in some 
 mystery, and yet the savage shouts just quoted point out a 
 possible origin. The emotional shout of an animal for a 
 given state is always the same ; but for the savage, who 
 possesses greater powers of utterance, emotions find various 
 expressions, or at least, if the expression begins with the 
 same sound, it ends differently. Although the New Zealand 
 savage shouts "Ha-ah" several times in succession, he 
 closes with " Ha!" When the child torments his companion 
 in the midst of misfortune, he says " Goody, goody gout." 
 Other expressions of a similar character, but used with a 
 different purpose, are "higelty, pigelty," "hee-ho," etc. 
 In modern poetry alliteration has given place in a very large 
 measure to final rhyme, which has become the unifying factor 
 for the verse generally in English poetry and always in 
 French. The qualities of sounds gave rise to melody in 
 speech, which is common to both poetry and music, and it is 
 as melody that the qualities of sounds play the most impor- 
 tant part. 
 
 Spencer holds, in his essay upon the origin of music, that 
 different emotional states produce different intonations and 
 changes in pitch, quality and loudness of vocal utterances. 
 In the savage dances of victory, worship, and love, emotional 
 speech grew up, and from this music arose. Originally 
 music was recitative — a mere chant. Chinese aud Hindoo 
 music is still so. This recitative speaking grew " naturally 
 out of the modulations and cadences of strong feeling." The 
 Quaker preacher who speaks only when moved by religious 
 emotion, speaks with a recitative intonation, and church 
 services of the present day are generally read so. This is 
 really melody. Eecitative speaking, or emotional speech, 
 constitutes the whole of savage poetry. 
 
 Poetry and music among primitive peoples were the same. 
 Poetry was either sung or chanted, and it was not until a 
 
 1 Guest's "History of English Rhythms," p. 179. 
 
RHYTHM. 19 
 
 later period that they became separated. With the discovery 
 of the musical instrument, the people saw that a melody was 
 just as well expressed by simple tones as by intelligible 
 syllables, and music took up its own lines of development. 
 
 The Emotional Effects of Rhythm upon Savages and 
 Children ; — There is no more striking fact in the whole field 
 of rhythm than the emotional effect which rhythms produce 
 upon certain classes of people, savages and children. Atten- 
 tion has already been called to the psychological phenomenon 
 of accompanying the changes of intensity in a series of 
 sounds by muscular movements. So strong is this impulse 
 in all classes of people that no one is able to listen to music 
 in which the rhythm is strong and clear without making 
 some kind of muscular movements. With some people 
 these movements tend to increase in force until the whole 
 body becomes involved and moves with the rhythm. The 
 accents in the rhythm have the effect of summated stimuli, 
 and the excitement may increase even to a state of ecstasy 
 and catalepsy. Although the regular recurrence of the ac- 
 cented syllable is the most important element, the qualita- 
 tive changes aid in bringing about the emotional states. 
 Soothing effects result from certain rhythms, as is shown in 
 the lulling and patting of the baby to sleep. The early 
 hypnotizers resorted to the gentle stroking of their subjects. 
 Savages are well aware of the exciting effects of certain 
 rhythms, and are accustomed to use them to bring about the 
 state of frenzy in which their priests give their prophecies 
 and in which religious dances are danced. Mr. Ellis, J who 
 has made a study of some tribes in Africa, says, " Music 
 amongst the Thsi-speaking tribes is limited to airs possess- 
 ing an obvious rhythm. Such airs seem to appeal to the 
 primitive sense common to all people, but upon savages, that 
 is, upon children with the possession and power of men, its 
 influence is immense, and the state of excitement into which 
 an assemblage of uncivilized people may be wrought by the 
 mere rhythm of drums and the repetition of a simple melody 
 
 would hardly be credited With some races this known 
 
 emotional influence of music has been utilized with three 
 objects, viz., to stimulate the religious sentiments, the mar- 
 tial spirit, and the sexual passions." 
 
 In the Yatiati 2 dance among the Indians of British Colum- 
 bia, the tribe assembles outside of the chief's house in which 
 the dance is to be held, and with fists and sticks they beat 
 the time on the walls as they enter, singing the dancing 
 
 1 A. B. Ellis, "The Thsi-Speaking Peoples of the Gold Coast of 
 West Africa," p. 325. 
 
 3 Franz Boas, Jour, of Amer. Folk-lore, Vol. I. p. 49. 
 
20 BOLTON : 
 
 song. The dancers who are on the inside are worked up 
 into a frenzy. The gentle striking at first, gradually increas- 
 ing in violence, and the slow approach and the assemblage of 
 the tribe, wrought in the dancers a pitch of excitement which 
 forced them to rush out after a time and begin the dance, 
 jumping about in the wildest fashion. Such dances cease 
 only with the complete exhaustion of the dancers. 
 
 The Patagonian wizard x begins his performance with drum- 
 ming and rattling, and keeps it up till the real or pretended 
 epileptic fit comes on by a demon entering him. Among the 
 wild Yeddas of Ceylon the devil dancers have to work them- 
 selves into paroxysms to gain the inspiration whereby they 
 profess to cure their patients. With the furious dancing to 
 music and the chanting of attendants, the Bodo priests bring 
 on a fit of maniacal possession. The excitement is allowed 
 to continue until the prophet falls to the ground in a 
 swoon. When the Alfurus of the Celebes invite their deity 
 to descend among them, the priests, standing about the chief 
 priest, upon whom the deity is to descend, chant some 
 legends. A slight twitching of the limbs marks the beginning 
 of the possession. The priest turns his face towards heaven, 
 the spirit descends upon him, and with terrible gestures he 
 springs upon a board and beats about with a bundle of leaves, 
 and leaps and dances, chanting some legends. He falls in a 
 swoon, and the sounds he emits are interpreted as the will of 
 the spirit. 
 
 George Catlin 2 says dancing is always accompanied by the 
 singing of mysterious songs and chants, which are perfectly 
 measured and sung in exact time to the beat of the drum, 
 always with an invariable set of sounds and expressions. 
 
 The religious services and singing among the Shakers are 
 often accompanied by dancing, and more frequently by beat- 
 ing of the time by all the members of the congregation. The 
 excitement among them never rises to an extreme degree. A 
 highly civilized people is not easily affected by mere rhythms. 
 A simple tone is not so expressive as it is to the lower 
 classes of people. The negro preacher often resorts to reci- 
 tative speaking to produce the desired emotional state in his 
 hearers, which is generally known as the " power." He selects 
 some short sentence, often unimportant, such as " Moses 
 went up into the mountain," and repeating this, at first 
 softly, he gradually raises his voice to the highest pitch, at 
 the same time increasing his gesticulations. The more ex- 
 citable of his audience are thrown into a paroxysm ; the con- 
 
 1 E. B. Taylor, " Primitive Culture." 
 
 2 George Catlin, " Letters and Notes upon the Manners and Cus- 
 toms of North American Indians." 
 
EHYTHM. 21 
 
 tagion spreads so that sometimes the whole audience is in- 
 volved. Evangelists among all classes of people rely more or 
 less upon the emotional effect of rhythmical speaking. 
 Street hawkers and fakirs generally speak with a recitative 
 intonation. Their success depends very largely upon their 
 success in alluring and holding the attention of the crowd by 
 the manner and intonation with which they speak. 
 
 The effect of rhythm and clearly accented music is no 
 greater upon primitive peoples than upon children. Al- 
 though children are not allowed to go into ecstasies, the 
 clapping of the hands to the recitation of u Peas porridge 
 hot" is akin to the terrible leaping and gesticulations of the 
 savage to the accompanying tom-tom and the chanting of his 
 ancient legends. The child usually begins his recitation of 
 " Peas porridge hot " rather slowly, and as he continues he 
 grows in excitement and enthusiasm, his gestures become 
 more violent and rapid, until he breaks down in the excite- 
 ment. It is a well-known fact among school teachers that 
 young children become excited whenever they sing rhymes 
 with a strongly accented rhythm. Several have made this 
 observation during the singing of a certain line in Theodore 
 Tilton's "Baby Bye." The line in which the excitement 
 reaches its climax is, 
 
 There he goes 
 On his toes 
 Tickling baby's nose. 
 
 This is a type of the fairy measure. The accents are 
 strong, and every line is preceded by a pause, and at the 
 same time all the lines are rhymed. Both the rhyme and the 
 pause lend an intensification to the rhythm that is sufficient 
 to call out the greatest excitement in the fairy people. In 
 Bobert Browning's poem of the " Pied Piper of Hamlin," 
 whose charm was rhythm, occurs this remarkably rhythmical 
 passage, and taken with the context might easily cause some 
 emotional excitement : 
 
 Into the streets the piper stept, 
 Smiling at first a little smile, 
 As if he knew what magic slept 
 In his quiet pipe the while. 
 
 I have the testimony of an eminent educator that, when he 
 read these lines, and he is an effective reader, his boy, a 
 youngster of five or six years, would run away and hide 
 where he could not hear the reading. He was apparently 
 unable to bear the strain of the excitement. In later years 
 the boy could not tell why he did so, except that it disturbed 
 him. 
 
22 BOLTON : 
 
 The use by children of incantation rhymes for purposes of 
 injury and torment to their companions is interesting in this 
 connection. The habit of rhyming is almost instinctive with 
 them. Imagine the effect of such a couplet as this upon the 
 child to whom it is addressed : 
 
 Good night, 
 Rosie Wright. 
 
 Again, any name may be put in certain adaptive rhymes 
 which are current among children. These, however, are not 
 so effective as the instance cited above. They admit of 
 retort. The drawling out of a name in a sing-song measured 
 tone is very effective, and the easy adaptation of some names 
 makes the child who is unfortunate in having such a name an 
 object of torment. 
 
 The Place of Rhythm in Music and Poetry. Music : — We 
 have seen how music and poetry took their rise together 
 from the emotional utterances of savages during the dance, 
 and how these emotional utterances gradually took the form 
 of recitative speaking. This gave rise to the melody, though 
 it was not disassociated from the meaning of the words. 
 With the discovery of the musical instrument came the 
 discovery that a melody might be sustained by simple tone 
 intensities. Although music finds its essential basis in 
 rhythm, its distinctive feature is the melody combined with 
 harmony. The melody is constituted of a succession of tones 
 which are significant of an emotional state, and when several 
 melodies are combined and sung together, they give rise to 
 harmony. This combination of melodies depends upon the 
 pitch of the sounds. The melodies in harmony are all 
 subordinated in different degrees to one dominant melody 
 which is higher in pitch than the others. The unifying ele- 
 ment here is pitch. This is the only distinctive use that is 
 made of it in either music or poetry. The most important 
 and fundamental unifying principles underlying music is the 
 time, without which there can be no music. Musical tones 
 must be exactly timed, if one is to get the conception of a 
 melody from a series of tones. When they are exactly timed 
 they may be farther unified by regular changes of intensity 
 which group the sounds into measures. The most common 
 measures that occur in music are 2-4, 3-4, 4-4, and 6-8 time. 
 In what might be termed the natural system of accents, the 
 first note in each measure receives a strong accent. This is 
 really the only accent in 2-4 time. In 3-4 time the second 
 note also receives an accent, but it is weaker than the first. 
 In 4-4 time there are four grades of intensity. The first note 
 is the strongest, the third next, the second is weaker still, 
 
RHYTHM. 23 
 
 and the fourth is the weakest of all. In 6-8 time the third, 
 fifth and sixth are of about equal intensity, and weak. The 
 first is strongest, the fourth is next, and the second weaker 
 though stronger than the third. An equal amount of time is 
 given to each measure — that is, the strong accent occurs at 
 regular intervals — but the distribution of this time among 
 the notes in a measure may be greatly varied ; the separate 
 notes, however, always bearing constant and simple relations 
 to one another. The smallest fraction that may express the 
 relations of these notes is 1-64, and this appears only in 
 instrumental music. In poetry, as we shall see, there is not 
 so much freedom ; it has deviated less from the primal 
 rhythmic stock from which both spring. For many centuries 
 music consisted wholly of melodies, or of a single melody. 
 The idea of combining or singing several melodies at the same 
 time came very much later. This is harmony. It reached its 
 highest development about Elizabeth's time, when the at- 
 tempt was made to combine as many as forty melodies. A 
 much smaller number was found to give better effect, and the 
 number now used is generally only four. Symphony was a 
 still later development, but the general feeling among mu- 
 sicians now is that it culminated in Beethoven, and its 
 further development in music is impossible. Although the 
 term has had several significations in the history of music, 
 in Beethoven it was the combination of several themes in 
 such a way as to bring about a succession and combination of 
 strong emotional states. The musician who desires now to 
 produce new effects, turns to the Volks-Lieder for a theme. 
 He aims at variations of the rhythmical effects and introduces 
 new harmonies. Mendelssohn is said to have remarked, 
 when he heard some of the negro melodies of our slaves, that 
 here was a field for a great musical talent. Wagner, taking 
 the suggestion, has made such an adaptation of the Hunga- 
 rian melodies, and with what success the musical world is well 
 aware. Wagner has made a real advance, and for some time 
 musical composition will follow his lead. Although 
 there is a feeling among musicians that rhythm is distasteful, 
 it is more apparent than real. It is the regular monotonous 
 recurrence of the same rhythm without sufficient variations 
 that is displeasing and not the rhythmic flow itself. 
 
 Rhythms in Poetry: — We have already seen that when 
 language appeared as literature, it took the form of the 
 simplest possible rhythm. Even then it was the vocal 
 accompaniment of a dance, and there are many analogies to the 
 simple swaying of the body or the tramping of the feet in the 
 march. There were no fixed rules in regard to the number 
 of syllables to the measure. The verse, so far as we can 
 
24 BOLTON : 
 
 speak of a verse, consisted of an alternation of accented and 
 unaccented syllables. Very generally it began and ended 
 with an accented syllable, so that a pause occurred between 
 each verse. The line of development along which poetry 
 followed was an increase in the number of unaccented sylla- 
 bles as compared with the accented, and also an increase in 
 the number of accents to the verse ; the verse preserving for 
 some time the same balance of structure that it had in the 
 beginning. The number of accents then might be four, six 
 or eight; the latter number never became popular, for the 
 reason, it would seem, that it exceeded the normal mental span. 
 This even and balanced structure could not hold out forever ; 
 a demand for variety and the influence of foreign rhythms con- 
 tributed to overthrow it, so that Chaucer wrote altogether in a 
 verse of five accents, but he still retained the middle pause. 
 This came after the second accent or just before the third, 
 though sometimes after the third also. There were many 
 verses in which the first section more generally contained 
 three accents. 
 
 Guest takes no account of the measures or feet in English 
 verse. He divides lines into three general classes : Those 
 that begin with an accented syllable, those that begin with 
 one unaccented syllable, and those that begin with two unac- 
 cented syllables. The varieties in each of these classes 
 depend upon the position where the variation occurs from the 
 form in which the verse sets out. Should the verse begin 
 with an accented syllable and continue with an alternation of 
 accented and unaccented syllables, it would constitute one 
 variety. If, however, two unaccented syllables occur between 
 any two accents, it would constitute a different variety accord- 
 ing as the two unaccented syllables occur between the first 
 and second accents, the second and third, and so on through 
 the verse. Early poetry was sung to the accompaniment of 
 the harp and hence was sung in exact time. On this account 
 Guest says that up to the fourth century, English rhythms 
 were temporal and then became accentual. Previous to that 
 time the syllable had a time value. This, however, is not to 
 be taken in any absolute sense. Poetry was chanted in a. 
 kind of trance state, and the reciter aimed to produce such a 
 state in his audience. For this purpose the thought was of 
 minor importance. Great dependence was placed upon the 
 rhythmical flow, and doubtless a very exact time was given to 
 the syllables that the movement might be clearer. A rhythm 
 which depends wholly upon either the time element or the 
 accent, is certainly less forcible than one which combines both 
 factors. It must be conceded that though some regard was 
 paid to the time of syllables, no such exact time was main- 
 
RHYTHM. 25 
 
 tained as modern musicians keep in their music. Perfect 
 time is the result of the application of scientific methods to 
 music. Poetry has never lost the time element entirely, for 
 accents that occur at irregular intervals could not have been but 
 very displeasing, and they are now. It is reported of some of 
 our modern poets, and especially of Tennyson, that they read 
 their poems with the strictest observance, not only of the ac- 
 cents, but of the time, showing that they regarded the time ele- 
 ment of great importance. Many readers and teachers of 
 English poetry pay little heed to the regular recurrence of the 
 accent. For them the thought is the chief element in poetry, 
 and in attempting to bring that out, they disregard the rhythmi- 
 cal flow. But when the proper observance of the thought does 
 violence to the rhythm, the poet must be adjudged lacking 
 poetic inspiration, and to that extent his poetry is not true 
 poetry. It is to the great renown of Chaucer, Milton and 
 Shakespeare that there is such a perfect adaptation of the 
 rhythm to the theme in hand, and any lack of observance of 
 the accents by the reader betrays his want of understanding 
 of that which he reads. The strict observance of time in 
 music and the unity of origin of poetry and music, which 
 argues that time was once an essential element of poetry, show 
 that the time element is still there, unless it can be shown 
 when and why it has dropped out. Poetry has admitted 
 fewer variations and allows a greater prominence to the 
 rhythmical flow than music. It must be admitted, however, 
 that the thought has taken the place of the melody to a 
 great extent as the unifying element, but it cannot be allowed 
 to take the place of other factors. Whenever it does, just so 
 soon the composition fails of being in any sense poetry. 
 
 Alliteration, which was very prominent in Anglo-Saxon, 
 was gradually lost. The influence of the church and of Latin 
 scholarship aided somewhat in this movement, but as the 
 Anglo-Saxon element prevailed against all foreign influences 
 in the political and social affairs, it won the day in the 
 struggle against the Norman and Latin languages. Our lan- 
 guage remains essentially Anglo-Saxon, and alliteration, 
 though less common, is still a prominent feature of our 
 poetry. Originally, alliterated syllables marked the beginning 
 of the section and constituted the unifying factor of it, but 
 there was no strict observance of such a principle, except that 
 the alliterated syllables were accented. They might come 
 anywhere within the section. The use of alliteration by later 
 English poets was to place the alliterated syllables away from 
 the beginning of the section and to put them in the same verse. 
 The purpose of alliteration is not to coordinate two sections 
 •or two lines, but, by intensifying certain accents in the verse, 
 
26 BOLTON : 
 
 to make a more perfect subordination of them, or to make a 
 more perfect unity of the line. Final rhyme succeeded allit- 
 eration. The chief reason seems to have been for a more 
 emphatic or distinguishing mark of the rhythm than could be 
 obtained through accents alone; especially when run-on 
 lines came to be used and the thought was about to usurp 
 everything. When two successive sentences or words begin 
 with the same sound, it interferes with the understanding of 
 them. Both the reader and hearer are more likely to con- 
 found them. For this reason alliteration must give way r 
 except for purposes of emphasis, when the thought becomes 
 of the first importance. Simple intensities are not sufficient 
 as unifying factors ; they cannot be properly subordinated to 
 give unity to the line. It is interesting to note how the change 
 from alliteration to rhythm has come about. In the early poet- 
 ry, the alliterated syllables came at the beginning of the verse, 
 but in modern poetry the rhymed syllables, which are their 
 successors, come at the end. We shall see later how the begin- 
 ning and end of rhythmical groups run into one another 
 and become indistinguishable. The same is to be observed 
 with reference to the feet. The accents in the feet become 
 transposed. Although it seems probable that the foot in 
 early poetry and the measure in all music began with the 
 accented sound, the accented syllable in English poetry is 
 more generally the last, and in Latin and Greek poetry it was 
 quite as frequently the last as the first. The series of accented 
 syllables in the verse and of articulate sounds in the foot seem 
 to appear as a series of stimuli which are to be summated. 
 The two sections of the verse in old English were made to 
 rhyme with their last syllables, and were then written as two 
 verses. Two such couplets together form the most common 
 stanza in English poetry. Instead of writing the members of 
 each couplet next to each other, they are made more fre- 
 quently and quite generally to alternate. 
 
 JEsthetic Forms : — That which binds the four verses into a 
 stanza is not wholly the interelation and balance of the two 
 rhyming couplets. The members of the two couplets are fre- 
 quently made to begin, the one with an accented syllable and 
 the other with an unaccented syllable. Sometimes this, and 
 sometimes a less number of accented syllables, make the 
 lengths of the alternate lines less — a fact that gives artistic 
 form to the verse when it is properly printed. It becomes 
 then an appeal to the eye as an aesthetically beautiful form. 
 This principle was seized upon by our poets during the six- 
 teenth century, and carried to an extreme as regards form 
 alone, which could not be sustained by the thought. The 
 
RHYTHM. 27 
 
 poem had nothing but form. The principle of form becoming 
 a unifying factor for a poem is perfectly true, and effective 
 use is made of it in modern poetry. Among the older poets, 
 George Herbert introduced many novelties into the forms of 
 stanza. He relied upon both rhymes and artistic forms. 
 Some of his stanzas take the form of a vase, an hour-glass, 
 a pyramid and an inverted cone. Although they read 
 smoothly, one cannot help but feel that his attempt at aesthetic 
 forms has destroyed the beauty of the poems. 
 
 The sonnet 1 is probably the most organic of all poems. 
 While the theme is very essential in binding the whole 
 together, the lines are coordinated in the most intricate way 
 by rhymes. A rhyme- scheme runs through the whole, 
 which, when represented by letters, or dots of different 
 sizes, or lines of different lengths, forms an artistic group, 
 obeying the laws of principality, subordination, etc. The 
 number of accents to the line is varied in some cases in such 
 a way that it lends a kind of subordination of some lines to 
 others, or of all to one or two. 
 
 Theme : — Little or no regard is paid to the thought in a 
 poetical recitation by children or by primitive peoples. They 
 delight in the emotional effect of sounds properly measured 
 and balanced. With the growth of literature the thought has 
 gradually become more important until it is about to usurp 
 everything. The unity of the stanza and of the verse very 
 generally depends upon it. Higher unities of the stanza — 
 poems — depend entirely upon the theme. The attempts to 
 coordinate stanzas by rhyming their last lines have not 
 proved a great success. The strength of the connection is 
 often lost. If the thought in the verse or stanza is allowed 
 to become the prevailing element, the poetry becomes 
 measured prose. Poetry arose in a kind of trance or highly 
 emotional state, and for centuries it was used to produce 
 such states in others. The whole structure is calculated to 
 produce emotion, and for that reason it cannot easily become 
 the medium of expression for the intellect. There must be a 
 mutual dependence between the thought and the form, or 
 they result in mutual destruction. 
 
 Under the influence of the church and Latin scholarship, 
 English poetry became, or at least the attempt was made to 
 conform it to certain rules of Latin prosody. English 
 critics, misunderstanding probably both English and Latin 
 poetry, tried to make the former conform to the rules of the 
 latter. And there are many persons now who cannot see 
 
 1 The reader is referred to Prof. Corson's " Primer of English 
 Verse" for a treatment of the stanza and sonnet. 
 
28 BOLTON : 
 
 why the rules of Latin prosody are not universal. A verse 
 beginning with an accented syllable and consisting of an 
 alternation of accented and unaccented syllables, was trochaic 
 measure, and the accented syllable was double the length of 
 the unaccented. If two unaccented syllables were used be- 
 tween two accents, it was the substitution of a dactyl for a 
 trochee. In this case, if the syllables preserved their proper 
 time values according to the Latin prosody, four time- units — 
 the dactyl — would appear in the place of three — the trochee. 
 This, however, did not strike the critics as forming a defect 
 in the rhythm, and the error has gone on. It is the current 
 view among respectable English authorities to-day. In order 
 not to keep the reader in suspense about so disputed and 
 important a point, let me say what seems to be the true view. 
 As the simplest time-unit of Greek poetry was a short 
 syllable, and whatever value in time was given to it in a 
 verse, that value must be maintained throughout, so the 
 simplest unit of English poetry is the time between two 
 accents — the foot is the simplest unit in the verse — and this 
 must be constant. The time is apportioned among the 
 syllables that are present between the accents, whatever the 
 number. From the very nature of the accent the syllable 
 receiving it will be longer relatively, though it does not bear 
 a constant and simple relation to the length of the unaccented 
 syllables. "Besides the increase 1 of loudness and the 
 sharper tone which distinguishes the accented syllable, there 
 is also a tendency to dwell upon it, or, in other words, to 
 lengthen the quantity. We cannot increase the loudness or 
 the sharpness of the tone without a certain degree of muscu- 
 lar action ; and to put muscular action into motion requires 
 time." 
 
 Another fact which has been greatly overlooked in the 
 study of English rhythms, and which has led to much con- 
 fusion and erroneous speculation and criticism of some poets, 
 is the sectional pause, which allows two accented syllables to 
 stand together in the verse. It was very common in Anglo- 
 Saxon poetry, and disappeared almost entirely under the 
 influences spoken of above. Shakespeare made free use of it, 
 and for a lack of this knowledge, critics assert that he made 
 use of false accents. Csedmon placed it before words upon 
 which he desired to have a strong emphasis. It occurs be- 
 fore names of the deity. Guest says it owes its existence to 
 the "emphatic stop," and is really the greatest departure 
 from the rules of accent, which were observed with much 
 care by the Saxon poets. It has been revived by more 
 
 1 Guest's " History of English Khythm," p. 75. 
 
RHYTHM. 29 
 
 recent poets, and effective use is made of it. The value of 
 this pause is the great emphasis it lends to the word follow- 
 ing, and my purpose in dwelling upon it now is that it will 
 come up again prominently in the experimental study. 
 
 Another question which connects itself very closely with 
 this point of accent and pauses, is the foot or measure 
 division of the line. Guest does not recognize such a 
 division as the foot. The line is an alternation of accented 
 and unaccented syllables, and he does not mention the fact of 
 these forming groups which in Greek prosody were called 
 feet and in music are termed measures. There seems to be 
 no question that readers do make such groups by placing a 
 slight pause either after or before the accented syllables. 
 The Greeks associated these groups with a complete step in 
 the march, and since in matters of aesthetics it is a rash thing 
 to dispute or deny the accuracy of their judgments, we must 
 regard the foot as a real division of their verse and inquire 
 whether the lack of quantity in English syllables has any- 
 thing to do with the absence of the foot division. The 
 English verse is made up of a series of syllables in which 
 every other one is uttered with greater intensity than the 
 rest. The accented syllable requires more time, and the 
 unaccented syllable unites or fuses with it into an organic 
 group. These groups are then apparently separated by 
 pauses. In French poetry there are no accented syllables, 
 and the foot division is not recognized at all. This gives 
 English poetry a kind of intermediate position between 
 Greek and French poetry. The question of a foot division 
 cannot be finally answered from an examination of our 
 poetry, except as has already been said, such divisions are 
 invariably made. The question will find its final answer in 
 the experimental investigation. 
 
 Another problem which follows closely upon this is, what 
 is the inherent nature of a group in a rhythmical series, or, 
 what is the relation of the different syllables to one another 
 in the poetical foot, and what determines the length of it? 
 
 The length of sentence 1 in prose is found not to deviate 
 long from an average. Long sentences may prevail in an 
 author for a few pages, but they are sure to be followed by 
 short ones in sufficient number to balance the long ones. 
 There appears a kind of rhythm in which long and short 
 sentences succeed one another. This rhythm is constant for 
 the same author ; his earlier and later writings show no 
 difference in the length of sentences. The writers of the 
 more ancient prose show a greater average length of sentence 
 than our more recent writers. 
 
 1 L. A. Schurmann. University Studies, Nebraska University, 
 Vol. I. 
 
30 BOLTON : 
 
 There have been several attempts in late years to con- 
 struct philosophies of English verse. Several of these will 
 be taken up and their more salient features presented. The 
 purpose is not to give a complete review of the books, but to 
 call attention to a few facts which will supplement the work 
 that has gone before. 
 
 The Science of English Verse by Sidney Lanier: — A simple 
 auditory impression recurring at regular intervals of time 
 furnishes the essential conditions of a rhythm. Of the four 
 properties of sounds — duration, intensity, pitch, and tone- 
 color — the mind can and does form exact coordinations of 
 duration, pitch, and tone-color ; intensities cannot be com- 
 pared with exactness. The regular recurrence of sounds and 
 silences constitutes primary rhythm, and a grouping of these 
 sounds by means of intensity, pitch, or tone-color, consti- 
 tutes secondary rhythm — the bar in music and the foot in 
 poetry. For purposes of verse, syllables correspond to 
 sounds and bear relations to one another in point of time, 
 which are expressed by the simple numbers 1, 2, 3, 4, etc. 
 The regularly recurring syllables of a sentence, whether prose 
 or poetry, constitute a primary rhythm, " which the 
 rhythmic sense of man tends to mould into a more definite, 
 more strongly marked and more complex form, that may be 
 called secondary rhythm. " ' < The tendency to arrange any 
 primary units of rhythm into groups, or secondary units of 
 rhythm, is so strong in ordinary persons that the imagination 
 will even affect such a grouping when the sounds themselves 
 do not present means for doing it." Accent simply 
 arranges the ' ' materials already rhythmical through some 
 temporal recurrence." As the comprehension of a series of 
 sounds is rendered more easy by grouping, so the compre- 
 hension of a series of these groups is rendered more easy by 
 again grouping these groups into tertiary rhythms. Allitera- 
 tion, the recurrence of emphatic words and punctuation 
 marks signify the tertiary group. The fourth order of rhyth- 
 mical grouping is the line which, except in the case of run- 
 on lines, completes a logical division of the sentence. Lines 
 are again grouped into couplets by tone-color coordinations. 
 The fifth order of rhythmical grouping is the stanza, and a 
 complete poem is spoken of as the sixth order. 
 
 The effort of the author, in his treatment of the foot, is to 
 make the rhythmical accent and grouping correspond to the 
 logical accent and meaning. For this purpose he treats at 
 length the iambic foot, it being the most common in English 
 poetry. Making use of musical terms, this foot is equivalent 
 to three eighth notes, and its typic form is one eighth note 
 
RHYTHM. 31 
 
 iollowed by a quarter note. Instead of the eighth note, the 
 foot may contain two sixteenth notes, and instead of a quarter 
 note, there may be two eighth notes, or a dotted eighth and a 
 sixteenth. The foot may also contain three syllables, each 
 being equivalent to one eighth note, or four syllables, but 
 the four must be read in the time of three eighth notes. 
 In the place of any note, may be substituted a rest of equal 
 length. An anapaest or dactyl cannot take the place of ar 
 iambic or trochaic foot, since the former are equivalent to f oui 
 time-units and the latter to three. He says there are two kinds 
 of rhythm only — 3-rhythm and 4-rhythm. All other kinds 
 resolve themselves into these two ; 2-rhythm is really 
 4-rhythm, and 5-rhythm is equivalent to a 3-rhythm and a 
 2-rhythm combined. 
 
 A Primer of English Verse by Hiram Corson ; — The 
 object of verse to him is "the expression of impassioned 
 and spiritualized thought. ' ' It originates in ' ' the unify- 
 ing activity of feeling and emotion." Upon whatever 
 objects " feeling 1 or emotion is projected, or with what it is 
 incorporated — it is unifying. " u The insulated intellect, in 
 its action, tends in an opposite direction — that is, in an analytic 
 direction. When feeling is embodied in speech, that speech 
 is worked up ... . into unities of various kinds." The primal 
 unity is the foot, which is combined u in a still higher unity 
 which is called the verse, and this in turn is combined into a 
 still higher unity, which is called the stanza." " Ehythm is 
 a succession and involution of unities, that is, unities within 
 unities." It applies to a succession of either feet, verses or 
 stanzas. Each class of unities has its combining principles ; 
 that of the foot is accent. Melody is the combining principle 
 for the syllables. Alliteration is a common and effective 
 form of consonantal melody. The combining agencies of the 
 stanza are harmony and rhyme. Individual verses may 
 be melodious, but when several are taken together they lack 
 harmony. Ehyme is also an enforcing agency of the individ- 
 ual verse, and the emphasis resulting is neutralized in pro- 
 portion as the verses are separated. Blank verse depends 
 u upon the melodious movement of the individual verses, 
 pause melody, and the general harmony or toning." Varia- 
 tions of the theme-meter produce important effects. "The 
 feelings of the reader of English poetry get to be set, so to 
 speak, to the pentameter measure, as in that measure the 
 
 1 This is the author's great mistake. No such distinction can be 
 drawn between feeling as unifying and intellect as analytic. Both 
 analysis and synthesis are equally properties of the intellect, and 
 it is difficult to conceive how the feelings can accomplish a synthe- 
 sis or unify anything. 
 
32 BOLTON : 
 
 largest portion of English poetry is written." The intro- 
 duction of any other than the theme-meter gives an emphasis 
 to the thought. The substitution of a different foot gives a 
 variety ' ' which is essential to harmony. ' ' The shifting of 
 the regular accent gives a special enforcement, either logical 
 or aesthetic. " There should never be a non- significant 
 departure from a pure monotony. ' ' 
 
 Rationale of English Verse by E. A. Poe: — Verse originates 
 with the human enjoyment of equality. Unpracticed ears ap- 
 preciate simple equalities. Practiced ears appreciate equalities 
 among equalities ; they are able to compare two sets of equals. 
 The rudiments of all verse may possibly be found in the spon- 
 dee. In this, the mind finds its first pleasure in the equality 
 of two accented syllables. A collection of two spondees — two 
 words of two equal syllables — forms the second step in the 
 development of the verse. A third step would be found in 
 the juxtaposition of three words. This, however, gives the 
 idea of a monotone, a relief from which is found in words 
 of different accents — iambics. A dactyl might be employed 
 as a further relief from the monotone. A sequence of words 
 of any sort would form a monotone, if they were not curtailed 
 or defined within certain limits. This gave rise to the lines, 
 the terminations of which are again determined by equalities 
 in length, and marked by equalities — likenesses in sound. 
 Every foot in the same verse requires equal time. A three 
 syllable word may appear as iambic or trochee, providing 
 that two syllables can be read in the time of one. Blending 
 is an unwarranted liberty. He states this general principle : 
 The substitution of a foot, the sum of whose syllabic times is 
 equal to the sum of the syllabic times of the foot substituted, 
 is allowed with this restriction only, that the regular foot 
 shall continue long enough or be sufficiently prominent to 
 leave no doubt of the kind of verse. He says " that rhythm 
 is erroneous, which any ordinary reader can, without design, 
 read improperly. ' ' The real test of the perfection of a verse 
 is the pleasurable feeling it yields. 
 
 Classical Poetry: — Classical Greek poetry was either 
 chanted or sung, and for that reason was exactly timed. 
 There was really no difference between a poetical recitation 
 and a song. The simplest elements in the measure, accord- 
 ing to which poetry was sung, was a time-unit equivalent to 
 one eighth note. By combining these time-units into groups, 
 they formed the measure or foot. A group of several feet 
 constituted the section, and two sections entered into the line, 
 a certain number of which were united into strophes or 
 stanzas. A time value was given to all syllables and words 
 
RHYTHM. 33 
 
 in the language ; they were either long or short. A short 
 syllable was equivalent to one time-unit, and a long to two. 
 Various measures were employed. They might be equal to 
 two, three, four, five or six time-units. The most common 
 measures contain three or four time-units. The three time- 
 unit foot most generally contains two syllables, one long and 
 one short, or one short and one long. The four time-unit 
 foot contains two or three syllables, generally two long, or 
 one long and two short, or two short and one long. 
 "When only one long syllable occurred in the foot, it received 
 an accent ; when there were two in the foot, the first received 
 the accent. The accented portion stood as the thesis, and 
 the unaccented as the arsis. In the same way the two sec- 
 tions of the verse stood as thesis and arsis. The thesis came 
 first. The middle pause did not usually divide the verse 
 into two equal divisions. The first was the shorter, the 
 pause coming within the third foot. Except as showing a 
 perfect subordination to a chief accent, and a slight anacrusis 
 at the close, the verses had no distinguishing marks ; they 
 were not rhymed, and very rarely alliterated. 
 
 The number of feet in a verse varied with different kinds 
 of poetry, two being the smallest and six the greatest. 
 The kind of foot with which the measure set out was 
 not always maintained. Any other foot agreeing with the 
 theme-foot in position of accent, and in the number of time- 
 units, might be substituted. As such agreements in the 
 kind of feet were few, there could be very little variety in the 
 verse. 
 
 Greek poetry was not allowed to develop long untram- 
 meled by rules. A rigid philosophical system was imposed 
 upon it, and all future poetry was made to conform to this 
 system. But it would be difficult to say that Greek poetry 
 suffered from the restriction. It prevented novelty for 
 novelty's sake, but allowed great freedom where freedom was 
 most needed. 
 
 There are several facts in the history of rhythm that are 
 interesting, both for the subject in hand and for psychology 
 in general. Soon after the idea of varying the number of 
 syllables in a foot had become known, and its effects appre- 
 ciated, there arose a kind of mania for verses which contained 
 a variety of feet. They were characterized as "tumbling 
 verses ' 7 from the peculiar effect they gave rise to. This was 
 a discordant and unpleasurable feeling. There was really no 
 rhythm to them, and they never became popular. The same 
 took place in regard to the length of line. Various novelties 
 were introduced, when a longer line than that of the earliest 
 poetry was found more pleasing and less abrupt. Verses of 
 
 3 
 
34 BOLTON : 
 
 six and seven accents were tried , and verses containing two 
 sections, each of which was an alliterated couplet, having 
 four or six accents, appear in some authors. No new com- 
 bining agency was employed, and probably for that reason 
 the verses exceeded the mental span. Had the older poets 
 grasped the principles of unifying their lines by rhyme, or by 
 proper subordination of the sections, they might have made 
 such long verses a success. In the same line were the 
 attempts at aesthetic forms, which have already been spoken 
 of. 
 
 Experimental Investigation. 
 
 HI This work was undertaken with several objects in view. 
 The first and most important object was to determine what 
 the mind did with a series of simple auditory impressions in 
 which there was absolutely no change of intensity, pitch, 
 quality or time-interval. Each separate impression was to 
 be indistinguishable from any or all the others. Eegular 
 variations with respect to the intensity or time-interval of 
 the sounds in this series, which will be called a rhythmic 
 series, were then to be tried separately and together, with 
 the purpose of determining what values these properties of 
 sound have in forming a rhythmical series — that is, a series 
 of groups of impressions — out of a rhythmic series. It was 
 seen at the outset that it would be practically impossible with 
 the apparatus at our disposal to employ pitch variations, and 
 for that reason no attempts were made with variations in 
 pitch. Variations in quality or tone-color were contemplated, 
 but the experiment was not carried out, first on account of a 
 lack of time, and secondly of proper apparatus. The results 
 of the first experiment anticipated much that was to be tried 
 in the later experiments. As the work progressed, new 
 problems were suggested for investigation until the narrow 
 limits within which the work was begun were greatly over- 
 stepped. These problems will be taken up in what seems to 
 be their proper order, and the results presented. 
 
 Apparatus : — The click of an electric telephone when con- 
 nected in an induction circuit is constant in intensity, pitch 
 and quality, when breaks occur in the primary circuit, pro- 
 viding the primary circuit is constant. The click is not the 
 same in intensity when the primary circuit is made as it is 
 when the primary circuit is broken. For this reason, the 
 sound at the break only could be utilized. It is perfectly 
 constant and stronger in intensity than the click at the make. 
 It varies directly in intensity with variations in the strength 
 
RHYTHM. 
 
 35 
 
 of the current and changes slightly in pitch and quality with 
 variations of intensity, but the pitch and quality are always 
 the same with the same intensity of current. A break at 
 regular intervals in the primary circuit, when the secondary 
 circuit is closed, the secondary circuit being open when the 
 primary was closed, was all that was necessary to furnish 
 the required series of auditory impressions with which the 
 investigation might begin. 
 
 A chronograph after the pattern devised by Wundt 1 and 
 
 FlGUBE I. 
 
 built by C. Krille, furnished a constant power. Figure I« 
 gives a general view of the whole apparatus as it was used in 
 this experimental investigation. 
 
 PThe drum- shaft was slipped off the drum and five arms, 
 two and one-half inches long were put upon it by passing the 
 shaft through a hole near one end. Each arm was provided 
 with a set screw, that the arm might be held in position and 
 
 Js^This apparatus will be found fully described in the second volume 
 of Wundt's Physiologische Psychologic, p. 279. 3d ed. 
 
36 
 
 BOLTON 
 
 its position changed at will. They were set at equal distances 
 apart along the shaft, and their points separated by 72 
 degrees, so that the space about the shaft was divided equally 
 into five divisions. (See Figure II.) Corresponding to 
 
 Figure II. 
 
 H 
 
 Figure II. shows the operations of the keys. 
 
 A. Drum- shaft. 
 
 B. The wooden arm on the drum-shaft. 
 
 C. The dotted line represents the following point of the arm. 
 
 D. The continuous line represents the leading point. 
 
 E. The dotted line indicates the position of the arm when the 
 key is pressed down. 
 
 F. The key bearing the platinum points, which project below 
 and are connected by the wire indicated by K. The dotted line 
 below shows the position of the key when the platinum points dip 
 in the mercury. 
 
 H. The rubber elastic which caused the key to react. 
 
 I. The rod upon which the key turned. 
 
 L. The mercury cup. 
 
 M. The wire connections. 
 
 each arm were two keys placed in such a position on the top 
 of the chronograph that as the shaft revolved the ends of the 
 arms came in contact with the ends of the keys and pressed 
 them downward about half an inch to allow the arm to pass 
 by in its revolution. The keys, which were ten in number, 
 two to each arm, were made of strips of wood, six inches 
 long and a half inch wide, and hinged horizontally upon a 
 steel rod two inches from one end in such a way that the ends 
 might move up and down. To the short ends were attached 
 elastics, which caused the long ends with which the arms 
 came in contact to rise up after they had been released by 
 the arms on the drum- shaft. They were prevented from rising 
 up too far by a piece of wood placed above them. Each arm 
 
RHYTHM. 
 
 37 
 
 bore two points, the one about an inch to one side and ten 
 degrees in advance of the other. The leading point came in 
 contact with one key and pressed it down in advance of the 
 other. As each point was broad, covering about twenty 
 degrees of the circle described by the end of the arm, the first 
 key would remain down until after the other had been pressed 
 down. As both points upon each arm were of the same width, 
 the key first pressed down would be released before the other. 
 Near the long end, each key carried two platinum points 
 which projected downward below the key, and which were 
 connected at the upper ends by a wire. When the keys came 
 down, the platinum points dipped into cups of mercury, which 
 rested upon the top of the chronograph. ( See Figure II. ) 
 These mercury cups were made by boring holes into the side 
 
 Figure III. 
 
 Figure III. shows the electrical connections. 
 
 A. The strip of hard rubber. 
 
 B. The battery. 
 
 C. The mercury cups. 
 
 E. 1, 2, 3, 4, 5. The primary coils. The double rings about 1 
 represent the induction coil. 
 
 K. The key-board. 
 
 The primary circuit is represented by light lines indicated by Y, 
 and the secondary circuit by a heavy line, X. 
 
 T. The telephone. 
 
38 BOLTON : 
 
 of a strip of hard rubber, five- eighths of an inch thick. Holes 
 were drilled into the edge of the rubber opposite the mercury 
 cups and copper wires inserted, which were connected with 
 the battery and induction coils in the manner which is 
 schematized in Figure III. Beginning at the left hand end 
 (marked "L") of the hard rubber strip, the first pair of 
 opposite cups and each alternate pair along the strip were 
 connected with a coil of wire on one side, and with the battery 
 on the other. For purposes to be described later, were five 
 coils of wire which might be connected with these mercury 
 cups. The coil and the battery were connected, thus completing 
 the primary circuit. The other pairs of opposite cups which 
 alternated with these were all connected together on the one 
 side with an induction coil, and on the other with the tele- 
 phone. The induction coil and the telephone were joined, 
 thus completing the secondary circuit. The ten keys corre- 
 sponded to the ten pairs of mercury cups. When the first 
 key at the left hand, and each alternate key thereafter, 
 was pressed down by the arms on the drum- shaft so that 
 the platinum points dipped into the mercury, it would 
 close the primary circuit, for these keys joined the opposite 
 mercury cups which were connected with the battery. When 
 the second key at the left hand, and each alternate key there- 
 after was pressed down, it would close the induction cir- 
 cuit. Key 1 at the left hand end of the strip of hard rubber 
 matched the first pair of opposite cups of mercury and was 
 paired with key 2, which matched the second pair of the 
 opposite cups of mercury. These first two keys were operated 
 by the first arm at the left hand end of the drum- shaft. The 
 other four pairs of keys were operated by the other four arms 
 on the drum- shaft. Let us consider now only the first pair 
 of keys and the first arm at the left. As the shaft revolves, 
 the point of the arm which was in advance of the other was 
 made to come in contact with the long end of key 1, and 
 pressed it down. After coming in contact with key 1, 
 the point of the arm could move through an arc of ten 
 degrees, keeping the platinum points in the mercury, and 
 thus closing the primary circuit, before the second point of 
 the same arm would come in contact with key 2. When 
 the keys were pressed down sufficiently to make the cir- 
 cuit, the points of the arm were made to slide by the ends of 
 the keys in such a way that the key was not released 
 until the arm had moved through an arc of twenty degrees. 
 A further revolution of ten degrees by the arm would press 
 key 2 down sufficiently to close the secondary circuit. If, 
 now, the arm continues to revolve, key 1 would be released 
 and rise up, breaking the primary circuit, but key 2 would 
 
RHYTHM. 39 
 
 remain down while the arm moved through an arc of ten 
 degrees, keeping the secondary circuit closed for a time after 
 the primary circuit was broken. This would give a sound in 
 the telephone. The same process would be repeated with 
 each of the five pairs of keys and their corresponding arms. 
 If, now, the arms were set at an equal number of degrees apart 
 and the drum- shaft were made to revolve at a uniform rate, 
 the clicks in the telephone would be separated by equal inter- 
 vals of time, and not varying in intensity, pitch or quality, 
 these clicks would form the required series of auditory 
 impressions. If a change in intensity is desired, as it was, 
 the five wires connecting the different pairs of mercury cups 
 might each be connected with the five different coils which 
 were referred to above. These were set at different distances 
 from the induction coil (see Figure III.). As the different 
 primary coils were of the same size, the strength of the 
 induced current, and therefore the intensity of the sound, 
 would depend upon the distance at which the primary coils 
 were placed from the induction coil. They were placed at 
 just sufficient distance apart to make the sounds easily dis- 
 tinguishable from one another in a graded series of intensities. 
 By means of the key-board (marked "K") it was possible to 
 connect all the five wires in any way that was desired with 
 the five primary coils. The clicks might all be of the same 
 intensity, all different, or of two, three or four different inten- 
 sities. Whatever the variation, according to this arrange- 
 ment it would recur every fifth click. When variations every 
 fourth or third were desired, three or four arms were set upon 
 the drum-shaft and only three or four pairs of keys operated. 
 If the arms were separated by an equal number of degrees, 
 the series of clicks would still be regular. Two kinds of 
 arms were employed, those with a single end and those with 
 a double end. (Figure II. represents the double ended 
 arm.) By using both single and double ended arms on the 
 shaft, and operating the five pairs of keys, it was possible to 
 get an arrangement by which variations in intensity might 
 occur every sixth or eighth click. Taking all the possible 
 arrangements together, the operator might introduce a more 
 intense click every two, three, four, five, six or eight clicks. 
 Again, he might make a series of clicks which were composed 
 of two, three, four or five different intensities of sound. 
 
 By making the number of degrees between the arms on the 
 drum- shaft different, a difference in time- interval between 
 the clicks was produced. In the same way as with the dif- 
 ferent intensities, a longer interval of time might be made to 
 recur every two, three, four, five, six or eight clicks. 
 
40 BOLTON : 
 
 The rate at which the drum- shaft revolved determined the 
 rate of the clicks in the telephone. This was controlled by 
 the fan regulator upon the chronograph. Faster or slower 
 rates were obtained by using smaller or larger fans. The 
 rate was determined by counting the clicks in the telephone 
 by a stop-watch. Eates between one click in two seconds 
 and ten in one second were possible. As the rate was a very 
 important factor, it will be given in all cases in the presenta- 
 tion of results. The " time" will indicate the interval be- 
 tween two clicks. The battery used consisted of 36 cells of 
 the "Watson's patent. 
 
 A further method of testing the accuracy of the setting of 
 the arms upon the drum- shaft, which was done with a pro- 
 tractor, was to connect a time-marker in the primary circuit 
 and take the record upon a drum along with a tunning-fork. 
 It was found that setting might be accurate, but the drum- 
 shaft might vary between one and two hundredths seconds in 
 six seconds. 
 
 There is one particular in which an improvement might 
 have been made in the apparatus. It was this : When the 
 primary circuit was made, though the secondary circuit was 
 open, a faint sound was heard in the telephone with close 
 attention. The induction coil acts as an electric condenser, and 
 the telephone being extremely sensitive, betrayed the presence 
 of a weak current. This might have been avoided by making 
 a break in both wires leading to the telephone, in such a way 
 that the telephone would be wholly disconnected from the 
 induction coil, when the primary circuit was made. During 
 the entire experiment, only a single subject detected the 
 presence of this sound, and for that reason it may be disre- 
 garded. The telephone was placed in a different room from 
 the chronograph, where there was as little disturbance from 
 other noises as possible, especially from any noises that were 
 in the least suggestive of a rhythm. 
 
 When the experiment first began, the apparatus was set so 
 that about three or four clicks to the second were heard in 
 the telephone. The subjects were not informed in any par- 
 ticular in regard to the experiment. They were invited to be 
 seated and listen to the telephone. This they did, taking 
 very generally a rather critical attitude. They were then 
 invited to say anything that suggested itself to them, what- 
 ever the character. These statements were all carefully 
 recorded, and will be given in substance. The sounds sug- 
 gested most generally and immediately the clock. Other 
 suggestions were: slowly dripping water, galloping horse, 
 pile-driver, etc. After the subjects had been seated for a time, 
 during which it was apparent they were making a critical 
 
RHYTHM. 41 
 
 study of the nature of the sounds, the statement most gener- 
 ally given, and voluntarily, was that the sounds were all 
 alike, and seemed to be separated by the same interval of 
 time. After this statement the subject paused, as if most 
 that could be said had been said. In some cases they asked 
 for particulars in regard to what they should look for. Some- 
 times, however, they went on to say that there was an 
 apparent change of intensity in the sounds ; the clicks seem 
 to group themselves by twos or fours, as the case might be ; 
 generally, however, it required some kind of a suggestion to 
 direct the attention of the subject to the grouping of the 
 sounds. An indirect method was preferred to a direct one. 
 In cases where the subject had spoken of the clicks seeming 
 like the clock ticks, they were asked if there was the same 
 difference of intensity or quality in the sounds as was 
 apparent in the clock ticks. This suggestion was sufficient 
 in many cases. The subject directed his attention then to 
 the matter, and if there was any tendency to make groups of 
 the clicks, it was apparent in a few moments. Sometimes it 
 was remarked that they had noticed such a grouping, but 
 had regarded it as a freak of their imagination, and did not 
 think it worth mentioning. Another method of directing the 
 attention of the subject to the grouping was to make a refer- 
 ence to the fact that they had said the sounds were all alike, 
 and then to ask why they had said sounds and not sound ; 
 did they suppose there was more than one sound ? In this 
 case also, they replied frequently that they imagined that 
 there was more than one sound, but did not think it worth 
 while to mention the fact. In some cases it was sufficient to 
 ask the subjects to count the clicks as they heard them, and 
 then to ask how they counted. The reply was that they 
 counted four or two, as the case might be, and then began 
 again. Again it was noticed that the subject was uncon- 
 sciously keeping time, with the foot tapping to every fourth 
 or every second click. Such a subject was asked why he 
 tapped every fourth or second click, and so his attention was 
 directed to a grouping that was going on unconsciously. 
 Such indirect methods were usually successful, but there were 
 several cases in which indirect suggestions of this sort failed 
 of their purpose. Direct methods of tapping a rhythm with 
 the fingers or counting did not suggest anything beyond the 
 clock tick to two subjects. These persons possessed no 
 appreciation of music at all ; they could not " carry a tune," 
 and yet were able to recognize some of the common airs when 
 they were sung or whistled. The general statement of the 
 remarks and answers of each subject will be given as fully as 
 it seems necessary. They will be abridged as far as possible, 
 
42 BOLTON : 
 
 but the special features in the answers of each subject will be 
 mentioned. The treatment of special phases of these results 
 will follow, and then will be taken up the result of special 
 investigations that were suggested during the first part of the 
 experiment. 
 
 Subject 1. Some musical talent and training. 
 
 Time, .23 sec. The first suggestion was a 4-group. Subject 
 could suggest groups of two, three, five and six, but when he made 
 no suggestion either by tapping or counting, he returned to a 
 4-group. The third in each 4-group was accented, 1 but it was pos- 
 sible in the later experiments to accent any member of the group. 
 In general the first in all forms of grouping was accented. The 
 3-group was unpleasant and the 5-group was very difficult to main- 
 tain. Time, 1.14 sec. The most natural form of grouping was by 
 two. It was possible to get a 4-group, but when the subject made 
 no suggestion of any other group, he returned to the 2-group. 
 Time, .167 sec. The 6-group was most easily suggested. It had the 
 appearance of being composed of two 3-groups. The subject showed 
 a tendency with this rate to group the 3 and 4-groups into higher 
 groups. Eight-groups of threes and 4-groups of fours succeeded very 
 well. It was not so easy or natural to make higher groups of fours. 
 Time, 1. sec. This rate produced a drowsy feeling. The subject 
 was inclined to make each click stand as the accented click in a 
 3-group, supplying the unaccented sounds between the accented in 
 imagination. When the subject was tired he noticed a tendency to 
 change the grouping frequently from two to three, and vice versa. 
 The subject showed a strong tendencjr towards 4-grouping in pref- 
 erence to all other forms of grouping, and yet during one experi- 
 ment, when the time was -208 sec, he found a 3-group more pleas- 
 ant than either a 2-group or a 4-group. The rate was too fast for 
 easy grouping by two. When he counted objects he counted them 
 by fours. Time, .323 sec. The subject was disposed to make a 
 4-group, and, even when every third sound was made more intense 
 than the others, he persisted in saying that he grouped them by 
 fours, but that there was probably a longer interval in the series 
 which disturbed the smoothness of his 4-groups. When his atten- 
 tion was called later to the accented clicks, he made no further 
 mistakes of longer intervals for accented sounds. 
 
 Subject 2. Some musical talent and training. Accustomed to 
 introspective work. 
 
 Time, .323 sec. The subject grouped by twos, visualizing the 
 pendulum. 2 He could suggest groups of three and four easily, the 
 four being more difficult than the three. Time, .263 sec. He 
 grouped the clicks by four, but the 4-groups were divided into two 
 2-groups. Time, .208 sec. This rate yielded easily and naturally to 
 a double 3-grouping. When he first listened to the telephone after 
 
 'This accent consisted of an apparent increase in intensity with a change in pitch and 
 quality. 
 
 2 Almost every subject either visualized the pendulum or spoke of the pendulum-swing 
 movement sometime during the experiments. In either case it was a form of grouping. 
 When the rates were slow, the subject visualized the clock pendulum and made one 
 click come near the completion of each half swing. The clicks were then grouped by 
 two and were called the clock tick. In my own case and in some others there was a 
 strong tendency to sway the body with the pendulum. This was called the pendulum- 
 swing movement by the different subjects. It was quite visible at times. By this pen- 
 dulum-swing movement groups of two, three, four, six or eight were frequently grouped 
 into 2-groups. The first group, then, in the 2-group was accented or more emphatic than 
 the other, and a distinct pause seemed to follow the second group. 
 
RHYTHM. 43 
 
 either a change of rate or at the beginning of a new experiment, 
 the clicks did not group themselves, but in a short time the tendency 
 to group increased until it required the greatest efforts to hear the 
 clicks as a uniform series. The subject was able to hear the 
 clicks as a uniform series, only by imagining some one pound- 
 ing in the distance. It required a mental picture of some object- 
 ive thing that was perfectly uniform. When he gave himself up and 
 listened to the series as a whole, he fell into some kind of grouping, 
 which might or might not continue for any length of time. He had 
 a strong tendency to shift from one grouping to another. He com- 
 pared it to the optical illusion of the "stairs." The double 2-group is 
 confounded sometimes with the double 3-group. Time, .187 sec. 
 The subject said he got a compound 2 and 3-group, which by actual 
 count of the accents to which he tapped with the fingers, showed 
 he was making a double 4- group. 1 This subject was strongly dis- 
 posed to double groups of all sorts. Time, .323 sec. At this rate the 
 2-group was most naturally accompanied by the mental image of 
 the clock. Time, .263 sec. This yielded most easily to a 4-group, 
 which took the form of two groups of twos. Time, .167 sec. This 
 rate yielded at first to a 6-grouping, which was divided into two 
 groups of threes, but it did not persist there ; he returned to a double 
 2-group. 
 
 The pulse seemed at times to impose a grouping in which the 
 clicks coming nearest in time to the heart-beat was accented. 
 When the subject gave his attention to breathing, it more generally 
 conformed itself to some grouping that was already going on. 
 Inhalation lasted during a 4-group and exhalation during a 3-group. 
 
 Subject 3. Considerable musical talent and training. 
 
 Time, .5 sec. The subject's first suggestion was of a 2-group, but 
 he immediately decided that a 4-group was more natural. He was 
 able to count almost any rhythm at this rate as far as twelve, and 
 the clicks seem to group themselves with the count. At first the 
 groups were apparently separated by a longer interval, which the 
 subject believed in the first place to be real. He was disposed to 
 regard the 4-group as the most satisfactory. Any grouping was 
 plainer when he counted. Diaphragmatic movements also accompany 
 the grouping. With indifferent attention there was no grouping. 
 The 4-group usually contained two accented clicks, either the first 
 and the third or the second and the fourth. The former were pre- 
 ferred. This rate was found to be most pleasing. It was animating. 
 The 5-group was difficult to get. A slight pause occurred between 
 the groups in every form of grouping. In the presence of the 
 chronograph, which gave a 6-rhythm which was composed of two 
 3-groups, the subject still grouped by four for a time, but this 
 tendency was finally overcome and the series yielded to the sugges- 
 tion of the chronograph. 
 
 When every fourth was accented, the subject being unaware of 
 this accent, said that the 4-group only was possible, for there 
 appeared to be a longer interval between every four clicks which 
 made any other grouping impossible. When the accent was 
 strengthened, he said the interval had been lengthened. This long 
 interval might come anywhere within the group of four, but it more 
 generally came between the groups. When two stronger clicks 
 followed by two weaker ones formed the series, the subject said the 
 
 'It is not unfrequent for a subject to mistake the actual grouping which he is making. 
 Sometimes a subject is so disposed to a particular number that he persists in saying 
 that he gets groups of that number, when it is perfectly evident a greater or less number 
 of clicks according to the circumstances is grouped with the accented clicks to which 
 he taps. 
 
44 BOLTON : 
 
 rate was slower. He grouped the series by fours, but it appeared 
 as though two long sounds followed by two short ones formed the 
 group. When three strong sounds and one weak one formed the 
 series, he still grouped by four. The first two in each group seemed 
 to be of the same length, the third was longer and the fourth very 
 short. During all the experiments the subject confounded stronger 
 clicks with long intervals, and was never able to tell the difference 
 between a strong sound and a long interval. He was surprised 
 when told afterwards that the longer interval had been caused by 
 accenting one sound. Time, 2.304 sec. The subject visualized the 
 pendulum, but said the pendulum seemed to reach its full swing 
 before the click corresponding to the swing was heard. The clicks 
 seemed to delay too long. Time, .323 sec. Every third sound was 
 accented. The subject had a strong mental habit for grouping by 
 fours and was greatly puzzled by this accent on every third, which 
 he said was a longer interval and broke up his tendency to form 
 groups of fours. Time, .208 sec. Every third was accented. The 
 subject forms 6-groups, which were accented upon the first and 
 fourth and a long interval appeared between the groups of six. 
 Time, .137 sec. When the series was composed of clicks of three 
 different intensities repeating themselves in the same order, the 
 3-groups were again grouped by four generally, though the subject 
 could suggest groups of three 3-groups. 
 
 Subject 4. Some musical talent. 
 
 Time, .288 sec. The clicks suggested the clock-tick. The subject 
 could group them by twos, but he found it more natural to groap by 
 fours. It has long been a mental habit with him to make groups of 
 four of any objects or impressions that would admit of any kind of 
 grouping. He counts by four and groups the puffs of a locomotive 
 by four. Four objects or impressions of any sort standing together 
 have always arrested his attention. He found it possible to group 
 these clicks by two, three or five when he made a suggestion either 
 by counting or tapping with the fingers, but when the suggestion 
 was stopped he returned to a 4-group. In every kind of grouping 
 the first sound was always accented. Time, ,115 sec. The subject 
 said the grouping was by four and was requested to tap the 
 accented click in every group. In six trials for five seconds each, 
 he tapped just five times during each trial, showing he made a group 
 of four in one second. The actual number of clicks to the second 
 being 8.6, it was apparent that he was making a much larger group 
 than four, probably an 8-group. When asked to make a 3-group 
 and tap the accented click in each group, the results were nineteen 
 taps in fifteen seconds, showing that his groups were not far from 
 six instead of three clicks to the group. 1 
 
 The 3-group was really a 4-group in many cases. Between each 
 group of three occurred one click, of which no account was taken. 
 It seemed to him something like this when he counted : 1, 2, 3, 1 — 
 1,2,3,1-1,2,3,1. 
 
 When the subject gave attention to the pulse, the number of 
 clicks coming between the beats of the heart formed a group. The 
 click which came nearest in time to the heart-beat seemed always 
 to correspond to it. The breathing adjusts itself to the 4-rhythm. 
 Inhalation lasts during one group of four, and exhalation during 
 another. In this way the 4-groups were grouped by two. Time, 
 .156 sec. By forming a mental image of the pendulum, or of some 
 object moving up and down, he was able to make double 4-groups, 
 
 'It is probable that the primary grouping was two, and these groups of two were then 
 united into larger groups of three and four. 
 
RHYTHM. 45 
 
 which corresponded to the full swing of the pendulum. These 
 three rates were given in rapid succession. Time, .536 sec. The 
 4-group was very clear. Time, .268 sec. The 4-group was un- 
 pleasant at first, but he gradually became accustomed to it. At 
 first the rates seemed too fast. Time, .536 sec. With this latter rate 
 the 4-group seemed to divide into two groups of two during the 
 second trial. Time 1.072 sec. The 2-group seemed most natural 
 and the subject felt a strong tendency to form higher groups of 
 twos. After the subject became accustomed to this rate, he was 
 more inclined to form 4-groups than 2-groups, but still the third 
 and fourth clicks seemed at times more like a 2-group than a part 
 of a 4-group. The general effect of this last rate was soothing. 
 Time, 1.66 sec. This rate was soporific ; it was possible to form a 
 2-group, but he did not do so spontaneously. Time, .323 sec. The 
 subject grouped the clicks by four and found difficulty in suggest 
 ing a 3-group. When every third was accented, he persisted in 
 grouping by four. Again he was asked to suggest a 3 -grouping, 
 and he succeeded in doing so. The subject was unaware of the 
 accent, and expressed surprise that he could group by three, and 
 found it easier than grouping by four. The following rates were 
 given in rapid succession. Time, .268 sec. The 4-group was very 
 clear and pleasant. Time, .17 sec. The subject grouped by fours, 
 but felt a confused irritating feeling. There was something added 
 onto each group of four. Time, .134 sec. This rate recalled the 
 sound of a locomotive. He visualized a revolving wheel, during 
 each revolution of which he counted four. Time, .116 sec. He 
 still groups by four, but the 4-groups are grouped by two, a strong 
 and weak group together. When every eighth was accented, he 
 grouped by eight. There was a distinct pause along with the 
 accented sound. Time, .134 sec. Every eighth was accented. The 
 8-group divided into two 4-groups, with, a pause after the second 
 group. The 4-groups were grouped by two with the pendulum 
 swing. Time, .268 sec. Every eighth was accented. The subject 
 grouped by four and associated the pendulum swing with the 
 groups of four. 
 
 Subject 5. Some musical talent. 
 
 Time, .288 sec. The subject was most naturally disposed to a 
 4-group, and found it difficult to get any other. Time, .78 sec. The 
 2-group was most natural with this rate. The 3-group was pleasant 
 and easy when it was suggested. Time, 1.44 sec. It was easy to 
 form 2-groups, but other groups were impossible. These three 
 rates were given in rapid succession. Time, .353 sec. The 4-group 
 was most natural. Time, .183 sec. The 8-group was most agree- 
 able with this rate. Time, .156 sec. The subject found the 8-group 
 most natural. 
 
 Time, .3 sec. When every fifth was accented, the subject made 
 groups of four, accenting the four, and said that there was a rest 
 between each group. He found it quite as easy also to accent the 
 first. When his attention was called to this pause between the 
 groups, he decided that the groups contained five clicks, in which 
 the fourth was accented. When the first and third clicks were 
 made more intense, the subject was greatly puzzled for a time, but 
 decided that the series was compounded of a 2-group and a 3-group. 
 
 Time, .969 sec. He was able to form 3 and 4-groups. The series 
 was associated strongly with the clock, and for that reason the 
 4-group tended strongly to divide into two 2-groups. Time, .323 
 sec. He found the 4-group most natural and pleasant, and when 
 
46 BOLTON : 
 
 he attempted to form groups of three, they would immediately run 
 into fours. Time, .208 sec. The subject formed a long group of the 
 clicks which he thought was an 8 -group. The rate was too fast for 
 easy grouping by four, and his attention seemed to waver between 
 a 4-group and a longer one which he thought was an eight. 
 
 Subject 6. Some musical talent and training. 
 
 Time, .3 sec. "When the subject first listened to the telephone he 
 found no tendency to form groups of these clicks. Even after 
 repeated suggestions the subject did not comprehend what was 
 desired or to be looked for. He was asked to tap an accompani- 
 ment to the sounds with four fingers. After a time he found 
 himself accenting the third, and grouping the sounds by four. 
 When he tried the suggestion with three fingers it did not succeed 
 very well. When two were tried, the subject decided that the 
 4-group was a combination of two 2-groups. In the same way he 
 was able to group the sounds by six, but the groups divided easily 
 into two 3-groups. On the whole the 2-group was the most 
 natural with this rate. Time, .156 sec. The 4-group prevailed and 
 easily combined into 8-groups. Time, .78 sec. The 2-group was 
 most natural, but the subject was able to suggest the 3-group easily. 
 Time, 1.44 sec. Even a 2-group was difficult to get. The time 
 seemed to be too long. Time, .353 sec. Groups of two, three and 
 four were all possible. The first click in all groups was accented, 
 and the third also in the 4- groups. When he suggested a 6-group, it 
 divided easily into two 3-groups or three 2-groups. The 8-group di- 
 vided readily into two 4- groups. It was difficult to get a 5- group. The 
 5-group tended to run into a 6-group, which then divided easily into 
 two 3-groups. Time, .288 sec. The 4-group was most natural, and 
 readily combined into double 4-groups. Time, .156 sec. The 6-group 
 was most natural. When the telephone was disconnected and the 
 chronograph continued to run, the grouping always began with the 
 first click in a new group. Time, .78 sec. The 2-group was the 
 most natural. Time, 1.66 sec. There was no spontaneous grouping 
 with this rate. It was too slow. The subject found it convenient 
 to regard the click as an accented click in a 4-group, supplying the 
 three intermediate sounds in imagination. Time, .323 sec. At this 
 rate, the subject showed strong tendency to muscular movements, 
 either to tap with the finger or toe upon the accented click, some- 
 times to nod the head or sway the body. He found this rate very 
 favorable for voluntary changes of the grouping, which he did 
 either by counting or tapping with the fingers. The general 
 emotional effect was depressing. 
 
 The pendulum-swing movement or 2-rhythm was an important 
 factor in all his groups. The 6-group was usually composed of two 
 3-groups, and the 8-group of two 4-groups. Time, .167 sec. The 
 4-group was very clear and pleasant, and the subject tended to 
 group them by the motions of the pendulum. When every third 
 click was strengthened, the subject grouped by threes, and made 
 the 3-groups follow the motions of the pendulum. In this way the 
 series produced an exciting effect. Time, .134 sec. The 4-group 
 was plain and distinctly grouped by twos by the pendulum-swing. 
 This rate was also exciting and animating. When every sixth click 
 was accented, the grouping lost its exciting effect. When the 
 series was composed of clicks of three intensities, the strongest 
 first, the clicks were grouped primarily by threes and these 
 3-groups were again grouped into 4-groups. When the time was 
 changed to .167 sec, and three grades of intensity retained, the 
 higher grouping of 3-groups by four ceased. Time, .137 sec. When 
 
RHYTHM. 47 
 
 every sixth click was accented, the series was grouped by six, and 
 the six groups were again grouped by the motions of the pendulum. 
 Time, .167 sec. Every sixth was accented. The grouping was still by 
 six, but the 6 -groups did not group by two. With the slower rate 
 the 6-groups did not seem so compact as with the faster rate. 
 Time, .208 sec. Every sixth was accented. The 6-group was diffi- 
 cult to grasp. The time was too long and the group tended to 
 divide into two 3-groups. Time, .263 sec. Every sixth was 
 accented. There was greater difficulty still in grasping the 6-group, 
 on account of the tendency to divide the group into two 3-groups. 
 Time, .323 sec. Every sixth was accented. The subject now 
 grouped the series by four in spite of the accent upon every sixth. 
 When the subject heard the sound of the chronograph, which was 
 rhythmical, he grouped the clicks according to this rhythm, which 
 in this case was a double 3-rhythmical. Time, .3 sec. Every fifth sound 
 was accented. The subject grouped by fours, but the accent came 
 in a different place in each group. It shifted one place further to 
 the right. When a 6-group was suggested to the subject, the 
 accent changed its position in the opposite way. It shifted its 
 position one place to the left in each group. 
 
 Subject 7. Some musical talent and training. 
 
 Time, .3 sec. Almost immediately the series divided into groups 
 of four, and soon after the 4-groups were grouped by two. With 
 the suggestion of tapping, the subject was able to group by two, 
 three or five. Time, .78 sec. The 2-group could be suggested 
 only with difficulty. The 3 and 4-groups were not at all pleasant. 
 Time, .156 sec. There was no distinct grouping. The series seemed 
 to rise and fall in intensity at regular intervals. At times he had a 
 "dreadful" feeling that the chronograph was slowing up and about to 
 stop. The subject had observed this grouping of sounds in the puffing 
 of a locomotive. He had not noticed a definite number in the group. 
 The sounds simply rise and fall in intensity. Speaking of the 
 8-group, the subject said he had a feeling of not being able to 
 " round up " until he came to eight. It seemed natural to stop at 
 eight, and start over again. This group was accompanied by a 
 feeling of completeness. During inhalation, the clicks seemed to 
 come faster, and slower during exhalation. In all forms of group- 
 ing the subject felt a muscular sensation in the stomach and intes- 
 tines. He also felt a strong tendency to beat time with the thumb. 
 He had been taught to do so when quite young. 
 
 Four- grouping is a kind of mental habit with him. When the 
 series was accented upon every fifth, he still grouped by four, 
 making a pause between each group in which he pronounced the 
 word "and:" 1, 2, 3, 4, and 1, 2, 3, 4, and 1, 2, 3, 4. In the same 
 way the 3-group appeared as 1, 2, 3, 1, — 1, 2, 3, 1, — 1, 2, 3, 1. In the 
 4-group the first and third were always accented. In other groups 
 the first was accented. When the rate was .72 sec. or .156 sec. the 
 grouping did not come without suggestion by muscular movement 
 or counting ; with intermediate rates the grouping by four was 
 wholly involuntary. 
 
 The subject could group 4-groups by two very easily, but it 
 required an effort to group them by four, or 8 -groups by two. The 
 8-group was generally composed of a more and a less emphatic group 
 of four. 
 
 Time, .268 sec. A double 4-group was the most natural and easy. 
 One group was more emphatic than the other. Time, .263 sec. 
 Though the time was only slightly changed, the subject thought the 
 previous double 4-group changed into a more perfect 8-group. 
 
48 BOLTON : 
 
 There was not such a strong division into two 4-groups. Time, .208 
 sec. This rate gave a " better 8-group " than the previous one. 
 Time, .167 sec. The groups did not separate distinctly. There was 
 a kind of confused feeling about the clicks. Time, .137 sec. The 
 confused feeling with the previous rate was more apparent still. 
 When every sixth was accented, he grouped by six and the 
 6-groups were grouped by two with the pendulum- swing movement. 
 
 Subject 8. 
 
 Time, .3 sec. The subject took a critical attitude. He had no 
 preference for any grouping. He could count any number as far as 
 ten, and the series seemed to group itself according to the count. 
 In the longer groups, groups of two were frequent. Time, .156 sec. 
 The 8-group was the most suitable. It was composed of two 
 4-groups, and each4-group of two 2-groups. Time, 1.44 sec. It was 
 not possible to form any grouping. The rate was too slow. The 
 subject has noticed rhythms in the sounds of a mill-wheel, locomo- 
 tives and fans. He was not aware of any definite grouping of the 
 sounds. 
 
 Subject 9. Considerable musical talent. Long and careful training 
 in music. Accustomed to introspective study. 
 
 Time, .3 sec. The subject adopted a critical attitude and gave his 
 attention to the nature of the sounds. At first he was inclined to 
 believe that they were all alike in intensity, but then he thought 
 every third was stronger than the rest. For a time the interval 
 between the clicks seemed to be irregular, but he soon discovered 
 that this irregular interval might occur anywhere he chose to put 
 it. In a short time his tendency to find groupings of the clicks 
 grew so strong that it required an effort to hear the series uniform. 
 Such an effort was akin to the feeling of ''looking long into the 
 future." The grouping tendency had to be restrained. Time, .3 
 sec. The 4- group was so plain that he did not discover the fact 
 that it was imaginary and was completely surprised that the illusion 
 was so complete. It was then more than ever an effort to hear a 
 uniform series of single impressions. He said, ''I find no rhythm as 
 long as I hold my breath and stick to it." "I get hold of one click 
 to compare it with the succeeding clicks, but I can't hold onto more 
 than eight or nine." The simple suggestion of any grouping was 
 sufficient to produce that grouping. Groups of two, three, five, six 
 and eight follow immediately the suggestion of any of them. A 
 group of seven was more difficult. Groups of all numbers were 
 generally accented upon the first, but the accent could be volun- 
 tarily changed. In the 8-group the subject had a tendency to accent 
 every other one. The grouping was generally accompanied by 
 visible motions of the head and lips. A slight feeling of muscle 
 tension in the ear and back of the scalp marked one group from 
 another. There was a feeling of innervation of the muscles con- 
 nected with attention. 
 
 When the attention was directed to respiration the grouping was 
 not affected. Respiration was more inclined to follow the group- 
 ing. The heart-beat coming in about the same time as the accent 
 in a 4-group, tended to coincide with it. Time, .2 sec. The tendency 
 to group was still present in a small degree. The sound was 
 quieting. It suggested slowly dripping water. Time, 1.5 sec. The 
 suggestion was of a big clock. After listening to a fast rate for a 
 time and then to the rate of .687 sec, he decided that he felt no 
 tendency to group the sounds of the latter. Time, .116 sec. The 
 most natural group was eight, with a slight tendency to divide into 
 
RHYTHM. 49 
 
 two 4-groups. Time, .134 sec. The subject found a 4-group more 
 natural than an 8 with this rate ? but felt some tendency to make a 
 double 4-group instead of a simple 4-group. Time, .116 sec. An 
 8-group composed of two 4-groups was most pleasant. Time, .268 
 sec. His most pleasant group was two, but these groups tended to 
 combine to form double 2-groups. When two strong clicks followed 
 by two weak ones formed the series, he grouped by fours, but 
 accented the second and fourth. He described the phenomonon as 
 a summation in the second : "The after-image of the first was left 
 to the second to increase its strength." When the subject heard 
 the rhythm of the chronograph, he grouped the sounds accordingly. 
 
 Subject 10. Some musical talent and training. 
 
 Time, .3 sec. The 4-group appeared immediately. The subject 
 could suggest other groups of three, five, six and eight. The 3- 
 group was accented upon the first, and the 4-group upon the first and 
 third. During one experiment the subject said the accents in the 
 4-group were not distinguishable, but the groups were separated by 
 a slight interval. The 5-group was accented upon the first and 
 fourth, the 6-group upon every other one, and the 8-group was a 
 repetition of two 4-groups. Higher groups of threes as far as four 
 were easily obtained. The first and third groups of threes were 
 accented. Higher groups of fours were not easy or distinct. 
 During all the experiments unconscious movements in the tongue 
 were present. A slight muscular contraction took place with the 
 accented click. Other movements of the head, trunk, feet 
 and hands were visible, and the subject found it difficult to restrain 
 them. Time, .134 sec. These sounds were grouped by eight and 
 the grouping was pleasant and animating. Time, .156 sec. The 
 first suggestion was of a 6-group. The 8-group was difficult. Time, 
 .268 sec. This yielded to a 4-group, which the subject said required 
 about the same time as the previous 8-group. Time, .78 sec. The 
 2- group was the only one practicable. The suspense for others was 
 too great. Time, .116 sec. During this experiment the rate yielded 
 most easily to a double 4-group, and when the time was changed to 
 .45 sec. he had a similar feeling with the group of two, but one click 
 stood in the place of the 4-group with the previous rate. 
 
 Time, .116 sec. Every eighth was accented. The subject got a 
 very pleasant and "harmonious" 8-group. Time, .134 sec. Every 
 eighth was accented. The subject was less animated. He said, 
 "The group was more staid and steady. It had lost its tones." 
 Time, .17 sec. Every eighth was accented. It now required an 
 effort of attention to get the 8-group. It grew more pleasant as 
 the subject became accustomed to it. Time, .268 sec. Every eighth 
 was accented. The grouping was by four. Sometimes the subject 
 accented every other one and felt. disposed to count thus : one and 
 two and three and four, and repeating this between the accented 
 clicks. 
 
 Subject ll. 1 Some musical talent and training. 
 
 Time, .5 sec. The 4-group suggested itself immediately. The 
 first and third clicks were accented, the first stronger than the 
 third. Sometimes the third might be stronger than the first. It 
 was possible to accent the second and fourth. When the subject 
 gave close and critical attention to the sound, there was no tendency 
 to grouping. The grouping seemed most clear with an indifferent 
 state of mind; He showed a decided preference for 2 and 4-groups. 
 Time, .25 sec. The 4-group was most natural. Time, .115 sec. This 
 
 •The subject knew beforehand that this was to be an experiment ia the rhythmical 
 grouping oi: sounds. 
 
50 BOLTON : 
 
 rate yielded to an 8-grouping, each group being composed of four 
 strong and four weak sounds. At other times with this rate the 
 sounds seemed to rise and fall at regular intervals, which the subject 
 described as a waxing and waning of the attention. Time, .167 
 sec. The subject grouped by four, but felt a straining for a larger 
 group. Time, 1.67 sec. He grouped by two and visualized the 
 pendulum. One click came during each half swing. When the 
 subject gave attention to his breathing, he made an inspiration last 
 during the time of one click, and expiration during the time of 
 another. The first click was louder than the last. Time, .115 sec. 
 When the subject gave attention to his pulse the groups corre- 
 sponded to the time of the heart-beats. The click which came near 
 the beat was louder and became the first in the group. The pulse 
 seemed to reinforce the sensation of the sound. When the attention 
 was directed to respiration, the clicks increased in intensity during 
 inspiration and were grouped by two and decreased in intensity 
 during expiration. He visualized a curved line which rose during 
 inspiration and fell during expiration. Smaller undulations in the 
 larger curve corresponded to the 2-group. A melody always 
 appears to him as a zigzag line, in which the rises correspond with 
 every two notes. Time, .156 sec. He grouped the clicks by eight 
 and visualized an ellipse with four points upon either side. The 
 clicks seemed to locate themselves on these points. 
 
 The subject showed a strong tendency to muscular movements. 
 He felt an impulse to dance, clap the hands and tap the toes and 
 fingers upon the accented click. When the rate was .286 sec, this 
 tendency to muscular movements was stronger than with the other 
 rates. There was something animating about this rate. 
 
 Time, .3 sec. Every fifth was accented. The clicks were 
 grouped by five. The accented click always appeared as the 
 fourth in the 5- group and longer than the others. When this 
 click was further increased in intensity, it seemed very much 
 longer than the rest and appeared as an extraneous sound 
 which did not enter into the group. The other four sounds then 
 formed a group by themselves. When every sixth was accented, 
 the accented sound again appeared as an extraneous sound. It 
 simply disturbed his mental habits of forming some other groups. 
 When two clicks in every five were made stronger with one weak 
 click between the two strong ones, the grouping was still by five 
 but it was a combination of a 2-group and a 3- group. When three 
 strong and two weak clicks formed a group, it was composed then 
 of a 3-group and a 2-group. The 3-group contained two strong 
 sounds and one weak, and the 2-group one strong and one weak. 
 A short pause came after the fourth sound, which made it impossible 
 to make the 5 -group appear as composed of a2-groupand a3-group. 
 Time, .268 sec. Every third sound was accented. This accent 
 simply broke up the tendency of the subject to group by four and 
 did not compel him to group by three. When every sixth was 
 accented, he grouped by six, and accented the first and fifth, but 
 there was a strain towards a 4-group. Time, .167 sec. Every sixth 
 was accented. With this rate the 6 -group was pleasant and did 
 not tend so strongly towards a 4-group. Time, .137 sec. Every 
 sixth was accented. The 6-group was pleasant, and it tended 
 to unite into higher groups of two with the pendulum- swing move- 
 ment. 
 
 Time, .208 sec. When the subject listened to the sound of the 
 chronograph, which made a distinct and strong 8-rhythm, he was 
 unable to form any other group than eight. The 8-group was com- 
 posed of two 4-groups, the first of which was much stronger than 
 
EHYTHM. 51 
 
 the second. When he listened to the chronograph, which gave a 
 6-rhythm, which was composed of two 3-rhythms, he was unable 
 for a time to get anything but a 6-group, but this faded out with 
 continued effort and gave place to his previous 4-groups. The 
 4-groups were then grouped by two with the swing of the pendulum. 
 Time, .134 sec. Every eighth was accented. The grouping was by 
 eight, and the 8-groups were then grouped by two. 
 
 Time, .116 sec. Every eighth was accented, and the grouping 
 was by eight, and pleasant. Time, .134 sec. Every eighth was 
 accented. The subject took no spontaneous interest in the 8-group 
 at this rate. The period seemed to be too long. "It breaks off 
 with a dead end," he said. Time, .17 sec. Every eighth was 
 accented, but the grouping was by fours. The accented click was 
 simply a disturbing element. The series did not group easily by 
 either four or eight. Time, .208 sec. Every eighth was accented. 
 The grouping at this rate was distinctly by four. The accented 
 click acted somewhat as a disturbing element. When every fourth 
 was accented at this rate, the 4-grouping became pleasant, and the 
 accented sound was the first in each group. The 4-groups were 
 grouped by two with the swing of the pendulum. Time, .17 sec. 
 Every fourth was accented, but the time seemed to be too fast for 
 a pleasant 4- group. 
 
 When every sixth was accented, and the time .323 sec, the 
 grouping was by three, but the tendency to a 4-grouping was so 
 strong that it was possible to get a 4-group in which every sixth 
 sound was accented, the accented sound shifting its position in the 
 group. The accented click seemed longer, and a longer interval 
 followed it. When a very weak sound was followed by a very 
 intense one, the sound of the loud click spread itself over the 
 weaker one. 
 
 Subject 12. Considerable musical talent and great interest in 
 music. Accustomed to introspective study. 
 
 Time, .3 sec. The subject began immediately to count the clicks, 
 accenting every third. He unconsciously rocked himself in the 
 chair to keep time. He thought the rate slowed up at times and 
 then quickened again. The grouping was changed from three to 
 four by simply thinking of the number. He believed there was 
 some unconscious muscular movement about the change from one 
 rate to another. He could suggest a change by simply tapping with 
 his fingers. When he changed from a 3-group to a 4-group, the 
 4-group seemed too long at first, though he became accustomed to 
 it. In a short time the grouping seemed to change of itself into 
 three and then again into four. The 4-group was inclined to fall 
 into two 2-groups, the subject unconsciously nodding his head to 
 every other sound. He was able to suggest a 5-group, in which 
 the first and third were accented, the third more strongly. 
 He could accent any click in the group, but the first and the third 
 seemed easiest. Time, .156 sec. The 6-group appeared imme- 
 diately and spontaneously, and then broke up into two 3- groups. 
 He suggested a double 4-group, which gave rise to a feeling of a 
 slower pace. It was not so distinct as the double 3-group. This 
 had a kind of impelling force. The subject attempted to step in 
 time with the double 3-group, and then with the 4-group. The 
 double 3-group required a sprightly step. It was exciting. The 
 4-group at this rate did not appeal to him; it didn't take hold. This 
 rate was more stimulating than the previous one. Time, .115 sec. 
 The subject dropped into a 4-group, but the three was found more 
 stimulating. It was difficult, however, for him to put aside the 
 
52 BOLTON : 
 
 previous rate, and adapt himself to the new one. One click in 
 each group, however, seemed distinctly louder than the rest. 
 "When he grouped by four, it easily passed into an 8-group, but the 
 8-group was not so clear as the 6-group. He imagined a wheel 
 going around, making six clicks to a revolution. When he changed 
 the telephone from one ear to the other, the grouping changed 
 from six to a double 4-group, and persisted for a time. The 5-group 
 came only with difficulty. Time, .76 sec. The grouping was by 
 twos. The subject imagined the clock at home. The 3-group was 
 suggested by an image of a musical conductor beating time. Time, 
 1.44 sec. The subject gets the rhythm of the pendulum swing with- 
 out suggestion. He suggests also a 3-group, which recalls the time 
 of church music. Time, 1.66 sec. He finds it easy to imagine inter- 
 mediate sounds between the actual clicks, and these he groups by 
 three, the real click being the accented click in the 3-group. Time, 
 .286 sec. In order to obtain a notion of a rhythmic series — one of 
 uniform intensity — the subject turned his attention backward, and 
 saw a series of images to which he was adding one all the time. He 
 throws his attention upon what comes, and studies the nature of 
 the noise to see if the timbre is the same. It is a comparative 
 effort. But in spite of all efforts the series groups into a 2-group 
 at times. When a relay sounder was connected in the circuit of 
 a vibrator, which made 20 vibratious to the second, the subject 
 was still able to effect a grouping of the sounds into either 3 or 
 4-groups by tapping with the fingers upon the table. When he 
 dispensed with the suggestion, the clicks of the relay signal were 
 perfectly uniform, except perhaps a slight waxing and waning in 
 intensity, due probably to the waxing and waning of the attention 
 towards the sound. There was no real grouping. 
 
 When a longer interval was introduced every fourth, the clicks 
 came in a group of four, but there was nothing satisfactory about 
 the group. The clicks did not form an organic group. Each group 
 of four stood rather as a single compound impression. There 
 was no organic relation between the separate clicks in the group. 
 When the rate was rapid, the groups of four were grouped into 
 higher groups, the groups of four standing as single impressions. 
 When the rate was slow the long interval might come between the 
 groups or anywhere within it. There was something wanting, 
 something to be looked for in the interval. 
 
 As the nature of the group, the subject described his feeling as a 
 tendency to go back when he had heard three or four clicks, as the 
 case might be. He says he has a "mouthful" — a unity — and when 
 he has one, he seeks to get another. The same process continues 
 to repeat itself. When he directed his attention to the timbre of 
 the click, he got no grouping, but when he looked at the series as a 
 whole, the grouping was clear and spontaneous. There was not, 
 however, necessarily an accent in the group. 
 
 Subject 13. Considerable musical talent and training. A lover 
 of 2-4 music. 
 
 Time, .285 sec. It suggests the gallop of a horse — a short gallop 
 — and the clock. There is a breathless feeling about it. It is the 
 sound of car wheels — the whole train. It has a double vibration. 
 The clicks are grouped by two or by four. The group seems to 
 close with a rising inflection ; the last is apparently accented 
 lightly, as the first is strongly. The 2-group prevailed over the 
 four. Parts of "Erl King" are suggested by this grouping. An 
 objective suggestion was displeasing to the subject. The subject 
 preferred a mental suggestion in order to change the grouping from 
 two to anything that was desired. By such a suggestion the sub- 
 
RHYTHM. 53 
 
 ject was able to get most any group up to eight. The eight group 
 was not clear ; the accents were not sufficiently prominent. The 
 shorter measures are more strongly accented. Time, .115 sec. 
 This rate had a bad effect ; it was tormenting. The grouping was 
 by four of a particular pitch, followed by four of a lower pitch. 
 The subject might group the clicks by two in the same way, but 
 with less clearness. Time, .352 sec. This rate suggested something 
 going around, and every other sound was accented. When the 
 3-group was suggested, the first click was accented, and the group 
 closed with a rising inflection. Higher groups of 3- groups could be 
 obtained as far as four. The groups seemed to rise and fall in inten- 
 sity. At this rate also the short groups were more strongly 
 accented than the long. When the subject suggested a 4-group, 
 the first and the third were accented, the first probably stronger. 
 The 4- groups may be grouped again by four. Twenty was the 
 greatest number of clicks that the subject could grasp easily in 
 this way. The grouping becomes lost and disconnected with larger 
 numbers. The first groups in the larger groups were of greater 
 intensity, and the last of a lesser intensity. The intensity of each 
 succeeding group seemed to be less. This rate was said to have the 
 most " aesthetic effect." Time, .268 sec. The 2-group was most 
 easy ; a double 2-group was pleasant. The general effect of this 
 rate was a hurried feeling. The previous rate had been restful. 
 Time, .156 sec. The 4-group was most natural, and was accented upon 
 the first and the third. The 6-group appeared without volun- 
 tary effort. There may have been a mental suggestion of the six. 
 Time, .78 sec. There was no real grouping. It seemed painfully 
 slow. Time, 1.44 sec. The subject supplied two intermediate 
 sounds between the clicks, and grouped by three. The actual click 
 was the accented sound in each group, and came first. Time, 1.66 
 sec. The subject supplied three intermediate sounds between the 
 clicks, and grouped by fours. The real sound came first. Time, .134 
 sec. The double 4-group was most natural, and the subject breathed 
 with it. When every eighth was accented, the subject did not 
 become aware of the accent. The grouping was spoken of as being so 
 strong that it could not be gotten rid of. The groups of eight were 
 grouped by two with the swing of the pendulum. The clicks in the 
 8- group seem to decrease in intensity from the beginning to the 
 end. Time, .116 sec. Every eighth was accented. The movement 
 was the same as with the previous rate, or perhaps in place of the 
 pendulum movement the subject visualized an object moving up 
 and down, the upward motion lasting during the time of an 
 8-group, and the downward motion during another 8-group. 
 There was apparently a longer pause after the second group. The 
 subject felt a strong tendency to nod the head, and keep the time 
 by tapping the toe. Time, .17 sec. Every eighth was accented. 
 The 8-group lacked completeness. It was not so smooth as 
 the 8-group before ; it was distinctly divided into two 4-groups. 
 The accented sounds were generally unpleasant. The subject " has 
 not the restful impression of evenness" which had characterized 
 the uniform series. 
 
 Time, .323 sec. When the clicks were all of the same intensity, 
 the slightest suggestion of any sort was sufficient to cause the clicks 
 to fall into the group suggested. Even when the attention of the 
 subject was not called to a suggestion, and the subject apparently 
 did not attend, it would change the grouping to that suggested. 
 
 At times the subject had a feeling which was described as 
 " awful," that the chronograph was slowing up and about to stop. 
 When stronger clicks were introduced, the effect was unpleasant. 
 
54 BOLTON : 
 
 The following rates were given in rapid succession: Time, .268 sec. 
 The clicks were grouped by two, and the 2-groups seemed to rise 
 and fall in intensity at regular intervals. Subject could suggest 
 other groupings, but it drifted back to this, unless the subject kept 
 up the suggestion of some other. Time, .208 sec. The grouping 
 was by four. The rate was unpleasantly fast for a time. Time, 
 .134 sec. The grouping was by four ; the 4- groups seemed to rise 
 and fall in intensity, every other one being more intense. The 
 subject unconsciously breathed with this secondary grouping. 
 Every eighth was made more intense. The subject did not detect 
 the accent, but said the grouping by eight was so clear that it could 
 not be avoided. The 8-groups tended to group into 2-groups. 
 Time, .116 sec. Every eighth was accented. The clicks were 
 grouped by eight, and the 8-groups were grouped by a wave-like 
 motion. There appeared to be a longer interval between every 
 two groups. Time, .17 sec. Every eighth was accented. The 
 grouping was primarily by two, and the 2-groups were grouped by 
 four. The intensity of the clicks seemed to decrease from the 
 beginning to the end. The grouping was rough in comparison with 
 that for the previous rate. This form of grouping gave place finally 
 to a double 4-grouping, and the subject was strongly inclined to 
 keep the time by nodding or tapping with the toe. Especially 
 strong was this impulse when strength of the accent was increased. 
 Time, .208 sec. Every eighth was accented. The 8-group was now 
 more distinctly divided into two 4-groups. This grouping had 
 more " dignity and force, but was not so tripping as the fast rate 
 was." The 8-group was not so complete as it was with the faster 
 rates. 
 
 Subject 14. Some musical talent and training. 
 
 The first suggestion of a grouping was by eight, and the 8-group 
 was divided into two 4-groups. When a 2-group was suggested 
 the subject agreed that he could get it, but the 2-groups were again 
 grouped by two into 4-groups, and the 4-groups by two into 
 8-groups. A 6-group was suggested by counting six, but there 
 seemed to be a division corresponding to 4-groups. The subject 
 was under the impression for a time that there was a longer interval 
 or four different intensities of sounds which made this 4-grouping. 
 The 4-group was accented upon the first and the third. The 
 3-group did not succeed very well. The subject seemed to have a 
 habit of forming groups of two, and the strongest kind of a sugges- 
 tion was not sufficient to put it aside for a 3-group. Time, .156 sec. 
 The 8-group, which was divided into two 4-groups, was the most 
 natural, and seemed to prevail over all others. Time, .78 sec. 
 The 2-group was most easily obtained, but it was possible to sug- 
 gest either a 3-group or a 4-group. The subject was not sure 
 whether he preferred a 2-group to a 4-group. He also found the 
 3-group quite pleasant. Time, 1.44 sec. The 2-group was most 
 natural, and the subject could still suggest either a 3 or a 4-group, 
 but when he dispensed with suggestion, he returned to the 2-group. 
 
 The subject has noticed rhythms in the sound of mill wheels. 
 When he gave his attention to these sounds he visualized a series 
 of points on a fine which he counted by four or two. When he was 
 asked to count a series of dots, he said they were divided off into 
 twos by a bracket above them. It has always been a habit with 
 him to count objects by two. 
 
 When every fifth was accented, he grouped by five; the accented 
 click came fourth in the group, and it seemed longer than the rest. 
 When the accented click was made more intense still, its time 
 seemed longer than the rest. When one of the five was made 
 
RHYTHM. 55 
 
 weaker than the rest, they formed a somewhat irregular group that 
 was unpleasant. The weak sound caused a disturbance in the group 
 which was not present when a louder sound was introduced. 
 When all the clicks were made more intense, the rate seemed to be 
 slower than at other times. 
 
 Subject 15. Some musical talent and training. 
 
 Time, .3 sec. The sound suggested the clock. It was more easy 
 and natural to regard every other one stronger. Groups of three, 
 four and five were suggested. The 4-group was the most natural; 
 the first and third clicks were accented. At times the 4-group 
 seemed to divide into two 2-groups. When the subject attempted to 
 compare the 3-group with the 4-group in point of their agreeable- 
 ness, the three group appeared as three, with one sound coming 
 between the groups, thus : 1, 2, 3, 1, — 1, 2, 3, 1, — 1, 2, 3, 1. This 
 extra sound seemed to occupy a blank space between the three 
 groups. During other experiments afterwards, the 3-group 
 appeared in this form. The 4-groups were easily grouped by two. 
 They would combine into no higher groups as simple 4-groups. 
 The subject was able with great effort to combine two double 
 4-groups. When the subject counted objects, he usually grouped 
 them by twos. The objects seemed to be joined together by bars. 
 Time, .57 sec. This rate was very quieting. The 4-group was most 
 natural. The first and third or the second and fourth might be 
 accented. A longer interval appeared between the separate groups. 
 A long interval generally follows the accented click whether it is 
 imaginary or real. The subject regards real accents as extraneous 
 intruders. They introduce a long interval, and for that reason the 
 series seems irregular. By irregularity he understood a difference 
 in time interval of the clicks. The accented click seemed nearer 
 to the preceding click than the others. When two real accents o f 
 unequal intensity were put into a group of eight, the interval fol- 
 lowing the more intense click was the longer, and gave to a series 
 a very irregular appearance. When the accented clicks were 
 dropped out, the series became regular again. 
 
 Time, .268 sec. This rate was very favorable for voluntary 
 changes of grouping. He could suggest any grouping that he might 
 desire within limits. During every experiment the subject mani- 
 fested a strong tendency to some kind of muscular movements. 
 Any kind of muscular contractions would suffice as a suggestion of 
 a grouping. He said he either counted the clicks or made the 
 proper muscular adjustments for counting. There was mental 
 counting always at the start. He made unconscious movements 
 with the eyelids. Motions of the head were clearly visible the 
 whole time. When the subject was asked to restrain all movements 
 of which he was conscious, he said there was great difficulty in 
 keeping the grouping. The telephone was disconnected, and the 
 subject was requested to restrain his muscular movements or 
 attempts to count. When the telephone was connected again, he said 
 that the grouping had kept up during the interval. Although he 
 had restrained all visible motions, slight muscular contractions 
 were observed in the eyelids at the proper intervals of the accented 
 clicks. He said it was possible to keep the grouping by imagining 
 a series of colors passing before the eyes. He spoke of a feeling in 
 the eyes as " muscular color sensation." He seems to have felt an 
 adjustment of the muscles ordinarily used in visual attention. At 
 no time was he conscious of the muscular contractions of the mus- 
 cles in the eyelids. 
 
 Time, .57 sec. Every fifth was accented. The series was grouped 
 by five and the accented click came anywhere in the group. It was 
 
56 BOLTON : 
 
 more generally and naturally near the first place. Time, .268 sec. 
 The 3-group could be suggested, and was more naturally accented 
 upon the first, sometimes upon the third. The 6-group was strongly 
 accented upon the third and slightly upon the first and fifth. With 
 a uniform series, the 5-group required a distinct effort and was then 
 accented upon the last. In general the long and complicated 
 groups were less differentiated; they ran together. The 6-group 
 broke up into two 3-groups and the 8 group into two 4-groups. 
 A 7-group was very difficult to get. It would run readily into an 
 8-group. Time, .134 sec. Every eighth was accented. The 8-group 
 was pleasant at this rate. When the time was .116 sec. and every 
 eighth accented, there was a tendency to group the 8-groups by two. 
 During a subsequent experiment when the time was .116 sec, the 
 series seemed to rise and fall in intensity with no definite grouping. 
 Whenever an accent was put in, it made the series irregular and 
 unpleasant. The series became pleasant in proportion as it was 
 uniform, and with this rate the subject perceived only a rhythmic 
 rise and fall in intensity. 
 
 Subject 16. Considerable musical talent and training. 
 
 Time, .3 sec. His first suggestion was that every other one was 
 stronger in intensity, the stronger one coming first in the group of 
 two. For a time, the subject did not discover that the sounds were 
 uniform. He could suggest a 4-group, in which the first and third 
 were accented, the first stronger than the third. It was difficult to 
 get a 5-group, but when the subject did, the accents were upon the 
 first and third. The 2-groups might be grouped by fives, in which 
 case the first and third 2-groups were more intense than the others; 
 4-groups of twos were accented upon the first and third 2-groups; 
 2 and 3-groups of twos were accented upon the first. Higher 
 groups of 3-groups as far as five were possible. The accents were 
 the same as for higher groups of twos. Three-groups of three were 
 the most pleasing. Higher groups of four were more difficult. The 
 accents could not be kept clear. From early childhood, the subject 
 has observed and taken pleasure in the rhythms in the sounds of 
 the fanning mill, feed cutter and other machinery. The 4-rhythm 
 was the prevailing rhythm with him. The puffs of the locomotive 
 are grouped by fours, the first and the third being accented, the 
 first stronger than the third. He associates the pendulum with the 
 2-group. With the 4-group, he associates the locomotive or a 
 wheel turning around, making four sounds to each revolution. The 
 3-group generally requires attention to keep it and a suggestion to 
 begin. The 5-group breaks up into a 2-group and a 3-group. The 
 6-group generally divides into two 3-groups. Time, .176 sec. This 
 rate seemed most favorable for a 6-group. It was composed of two 
 3-groups, the subject visualizing the pendulum which grouped the 
 3-groups by two. In general, the subject preferred short groups to 
 long ones. The shorter groups were simpler. He preferred also his 
 own accents to real accents. When he listened to the sound of the 
 chronograph, which was distinctly rhythmical, he grouped the 
 sounds accordingly. When he was dull and tired, faster rates were 
 generally more satisfactory. 
 
 The following rates were given in rapid succession: Time, .323 
 sec. The clicks were grouped most easily by the pendulum-swing 
 movement. The subject could visualize a revolving wheel which 
 made four strokes during each revolution and thus group by four. 
 Time, .263 sec. The 4-grouping was decidedly pleasant and com- 
 pelling. It required an effort of attention to group by three. He 
 visualized the locomotive wheel with the 4-group. He could group 
 the clicks by two with a pendulum- swing movement, but "it was 
 
RHYTHM. 57 
 
 too fast to be real natural." Time, .137 sec. This was " a train at 
 full speed." The rate was more pleasant and enlivening than any 
 previous rate. It required very little effort of attention to get 
 either a 3 or 4-group. A 6-group was easily suggested, but the 
 group divided easily into two 3-groups. Time, .208 sec. The 6-group 
 was less easy than it was with the previous rate. Time, .137 sec. The 
 clicks grouped readily by three or four. Higher grouping of 3-groups 
 by two or three required a suggestion to start, and it seemed 
 to continue of itself ; 4-groups might be grouped by the pendulum- 
 swing movement. Every sixth was accented. The 6-grouping was 
 necessary and pleasant. The accented sound took away the effort 
 that had been required before for a 6-grouping. The 6-group might 
 be divided into three 2-groups or two 3-groups. The accented sound 
 always came at the beginning of the 6-group. Time, .167 sec. 
 Every sixth was accented. The 6-group divided easily into three 
 2-groups or two 3-groups. Time, .323 sec. Every sixth was 
 accented. The grouping was by two. The accented sound 
 grouped the 2-groups by three. The span for a 6-group was 
 disagreeable. It was too long. The accented sound might be over- 
 looked and the series grouped by four. Time, .167 sec. Every 
 sixth was accented. It was less easy to overlook the accented 
 click than before. The accent forced a grouping by three. 
 
 Time, .263 sec. It was most natural to group by two with the 
 pendulum-swing. Time, .208 sec. A 4-group was most easy. 
 When the subject heard the chronograph, which gave a 6-rhythm 
 compounded of two 3-rhythms, he grouped the sounds accordingly. 
 Time, 134 sec. A 3 or a 4-group was equally pleasant and easy. 
 The sound of the chronograph, which now gave an 8-rhythm com- 
 pounded of two 4-rhythms, compelled a grouping of the sounds 
 accordingly. The following rates were given in rapid succession 
 during a single experiment: Time, .268 sec. A 2 or a 4-group 
 was easy. A 3-group could be suggested. Time, .208 sec. A 
 3- group was suggested, but a 2 or a 4-group was easier. Time, .17 
 sec. A 3 or a 4-group was equally pleasant and easy. There was 
 no preference. Time, .116 sec. The series could be grouped by 
 three or four. When every eighth was accented, the grouping was 
 by eight. At first, the 8-group divided into two 4-groups. This 
 disappeared, and the 8-group became pleasant and agreeable. Time, 
 .134 sec. Every eighth was accented. The 8-group divided easily 
 into two 4-groups. The span was too long. There was no satisfac- 
 tion in the 8-group, for the accent did not come soon enough. 
 Time, .208 sec. Every eighth was accented. This was distasteful. 
 The feeling of suspense present before was greater still. Time, .268 
 sec. Every eighth was accented. The suspense was still greater, 
 and the 8-group broke up into two 4-groups. Time, .116 sec. There 
 was no accent. This rate, which had given before an agreeable 
 8-group, when every eighth was accented, yielded to an 8- grouping. 
 There was a slight tendency for the 8-group to divide into two 
 4-groups, the first of which was more emphatic. 
 
 Subject 17. Some musical talent and training. Accustomed to 
 introspective study. 
 
 Time, .3 sec. In the first place, the grouping was by two, and 
 almost immediately and without effort it changed to a 4-group. 
 When each click was attended to separately, they all appeared to 
 be of the same intensity. Suddenly the subject began to group by 
 four. He felt a tendency to count it off to himself. Sometimes the 
 4-group appeared as two 2-groups. Then he thought there was an 
 irregular interval — a difference in the time of the clicks. He then 
 imagined that a fainter sound was heard between the actual clicks. 
 
58 BOLTON : 
 
 Each click was grouped with the fainter sound following it, and 
 these groups grouped by two. Breathing seemed to accommodate 
 itself to the 4- group; inhalation lasted during one group of four 
 and exhalation during another. When every third was accented 
 and time .208 sec, the subject felt a strong tendency to inhale dur- 
 ing one group and exhale during another. 
 
 Each group is attended with the feeling of having completed a 
 member of the rhythm. The groups stand out as unities — as wholes 
 — and as each group becomes complete, there is a striving for the 
 next. The subject has a tendency to count the clicks by fours or 
 other numbers. When he attempts to suggest a 3-group, the third 
 click seems to repeat itself thus: 1, 2, 3, 3, — 1, 2, 3, 3, — 1, 2, 3, 3. 
 He succeeded, however, in getting a real 3-group by counting and 
 nodding the head with the accented click. When he attempted to 
 group by five, the accents seemed to crowd along until it brought 
 six into the group. The first three clicks seemed to come in the 
 time of two and the rest were irregular. When he succeeded in get- 
 ting a 5-group, it was accented upon the second. 
 
 Time, .965 sec. The 2-group was the most natural, but it was 
 imperfect. Time, 1.615 sec. The subject was able by strong effort 
 to group by two, but the sounds seemed more naturally to appear 
 uniform. 
 
 Subject 18. No musical talent and no interest in music. 
 
 Time, .352 sec. This was a very pleasant rate. Other rates 
 seemed either too slow or too fast. By no suggestion could any 
 kind of grouping of the sounds be effected. The subject declared 
 that they were all uniform in intensity. 
 
 Subject 19. Some musical talent and in training at the public 
 school. 
 
 Time, .268 sec. The subject likened the series to dropping water. 
 It was suggested to him that perhaps some sounds were louder than 
 others, when he said that every fourth seemed louder. Again it was 
 suggested that possibly every third was louder, but the subject 
 would not agree to it. When every third was strongly accented, 
 the grouping was by three. When the accent was dropped out, the 
 subject returned to a 4-group. When he listened to the sound of 
 the chronograph, which was making a double 3-rhythm, he 
 grouped the sounds accordingly. 
 
 Subject 20. Some musical talent and good training. 
 
 Time, .268 sec. The sound was likened to dropping water. It was 
 suggested that the clicks grouped together in some way, and the 
 subject replied that they were grouped by four. Again it was sug- 
 gested that some other grouping was possible. This, the subject 
 said, was by three. After reflecting and counting for a moment, 
 the grouping was thus: 1, 2, 3, 1—1, 2, 3, 1—1, 2, 3, 1. The first and 
 third were accented in the 4-group. 
 
 Subject 21. Physicist. 
 
 Time, .30 sec. The sound suggested the pendulum. A loud click 
 corresponded to one swing and a soft to the other. He visualized a 
 conical pendulum, which struck at several points in its swing and 
 thus grouped the sounds by other numbers than two. He seemed to 
 attend now to the series of clicks and then to relax and attend 
 again. During the " strains of attention," he might grasp three or 
 four clicks. A feeling of relief followed each strain of the attention. 
 All the muscles of the body seemed to point toward the source of 
 the sound. They alternately contract and relax with the successive 
 strains of the attention. The first click in each group was accented. 
 
 Subject 22. Some musical talent. 
 
RHYTHM. 59 
 
 Time, .3 sec. The clicks were grouped by four. Time, .78 sec. 
 This rate was too slow for any grouping. It did not even suggest 
 the clock tick. Time, .156 sec. This rate was too fast for easy 
 grouping in any way. 
 
 Subject 23. 
 
 Time, .268 sec. The prevailing group was four. It was difficult 
 to suggest any other. The sound of the chronograph, which gave a 
 6-rhythm compounded of two 3-rhythms, was scarcely sufficient to 
 break down the tendency to group by four. The subject had 
 worked in the same room with the chronograph, and had become 
 more accustomed to the 8-rhythm than to any other which the 
 chronograph made. 
 
 Subject 24. 
 
 Time, .268 sec. The clicks grouped immediately by two. There 
 seemed to be a difference in quality. When every fourth was 
 accented, they were grouped by four. A longer interval preceded 
 the accented click. When every eighth was accented, the clicks 
 were grouped by eight and a longer interval preceded the louder 
 sound. 
 
 Subject 25. Some musical talent and training. 
 
 Subject has noticed his tendency to group objects and sounds 
 before the experiment. Objects passing rapidly before the eyes 
 are grouped by eight, those passing slower, by four, and those 
 passing very slowly, by two. Time, .78 sec. Every other sound 
 appeared to be of sharper tone than the rest. The sharper toned 
 click grouped with a weaker and came first. Time, .115 sec. He 
 grouped by eight. When he gave attention to the pulse, he seemed 
 not to hear the clicks coming near or just after the heart-beat. 
 The clicks between the heart-beats were more distinct. No 
 grouping of the sounds would persist long. The accented sound 
 in the group generally came first, but it might come anywhere in 
 the group. 
 
 Subject 26. Some musical talent and training. Laboratory boy. 
 
 Time, .323 sec. The most natural form of grouping was by two. 
 The first was accented. When he suggested a 3-group, the rate 
 seemed to be slower, and then the clicks seemed to be of the same 
 intensity. When every third was accented, the accented click 
 came first in the group, and was preceded by a longer interval. 
 In whatever position an accented click stood, it was preceded by a 
 longer interval. With uniform sounds the 4-group was accented 
 upon the first and third ; the first was stronger than the third. 
 
 Subject 27. Some musical talent and training. 
 
 Time, .3 sec. The most natural form of grouping was by two. 
 The first was accented. He was able to suggest groupings by three 
 or four. The first sound in either group was accented. By tapping 
 with five fingers, and striking much harder with the fifth he was 
 able to suggest a 5-group. It seemed to be a matter of the imagi- 
 nation largely whether there was a rhythm. When he thought of 
 a clock or some other rhythmical machine, the series tended to 
 group according to the suggestion. The sound was most naturally 
 associated with dropping water. 
 
 Subject 28. No musical talent. 
 
 Time, .536 sec. It was possible to group the series by three, four 
 or five. The 4-group was most natural. From early childhood the 
 subject has observed the 4-rhythm in the puffing of the locomotive 
 especially, and in later years the same rhythm has been observed 
 in clocks, metronome, hammering, walking, and in all auditory 
 impressions that approach a regularity in sequence. The rhythm 
 is clearest in the sound of the locomotive. The first and third 
 
60 BOLTON : 
 
 sounds in the group are accented ; the first is generally more 
 strongly accented than the third. When the sounds of the loco- 
 motive become very rapid there is no definite grouping, simply a 
 periodic rise and fall in intensity. Time, .268 sec. This was 
 especially favorable for the 4-group, and the 3-group could not be 
 easily suggested. Time, .208 sec. The 4-group was most natural. 
 It was possible to suggest a 2-group by striking heavily on every 
 other sound. The grouping, however, was very monotonous. Both 
 the 3 and the 5-group were very difficult. Time, .268 sec. Although 
 the 3-group was difficult at this rate before, it could be easily sug- 
 gested this time. Time, .17 sec. The clicks were grouped by four 
 and the 4- groups tended to group by two with the pendulum- swing 
 movement. If the grouping was held down to a plain four, it be- 
 came unpleasantly monotonous. Time, .134 sec. The series tended 
 to appear in the form of a periodic rise and fall in intensity. The 
 periods were about equal to the time of an 8-group, and with a slight 
 voluntary effort the series grouped by eight. The 8-groups tended 
 to group by two with the pendulum- swing movement. During a 
 subsequent experiment with the same rate, the subject felt a ten- 
 sion in the eye muscles which grouped the series by eight ; four 
 sounds occurred during the upward movement and four during the 
 downward. 
 
 Subject 29. Some musical talent and training. 
 
 Time, .268 sec. When the subject thinks of a clock the series 
 groups by two, but when he thinks of hammering, the clicks 
 appear to be of the same intensity. He could suggest a 3 or 
 4-group, but the 2-group was most natural. Time, .208 sec. He 
 finds it easy to count almost any rhythm as far as nine. The longer 
 rhythms tend to divide into shorter ones. The subject found it 
 difficult to keep from thinking of a clock tick, which suggested the 
 2-group. Time, .17 sec. The subject still grouped by two and 
 thought the rate seemed to be faster when he grouped by two than 
 when he suggested other groups. 
 
 Subject 30. No musical talent. 
 
 Time, .268 sec. By no suggestion was it possible for the subject 
 to effect any kind of grouping of the sounds. It appeared as a dead 
 monotonous series, with which he could not avoid the association 
 of a pile-driver. 
 
 Many other persons who simply came in as visitors, were experi- 
 mented upon with results which confirmed the foregoing records. 
 No especial account was taken of them. More than fifty persons 
 in all were experimented upon, and only two failed to effect some 
 kind of grouping in the clicks which they heard. In general it may 
 be said that the younger and less educated yielded more easily and 
 quickly to the suggestion of a rhythmical grouping. 
 
 The first point in the preceding records to which attention 
 is called is the rhythmical grouping of the sounds. The 
 grouping was the same in every case. It was accomplished 
 by accenting regularly certain sounds more than others. 
 The weaker or less accented sounds seem to run together 
 with the stronger, and to form organic groups which are 
 separated from one another by intervals which are apparently 
 longer than the interval which separates the individual clicks. 
 Such rhythmical grouping has been observed frequently at 
 other times by many persons. Several of the subjects testify 
 
RHYTHM. 61 
 
 -to have known of their tendency to group the puffs of the 
 locomotive, even in early childhood, and they have taken 
 great delight in it. With us this habit of grouping the puffs 
 of the locomotive when it was starting slowly or pulling up a 
 grade became so strong, even in early childhood, that it led 
 to all kinds of speculation as to the cause. The puffs are 
 grouped by four. The first and third are accented, the 
 first generally stronger than the third. No other grouping 
 ever seemed possible until it was found in the experimental 
 work that the tendency to group by four was only a habit or 
 association. The puffs of a locomotive may now be grouped 
 by two or three, but the association of the drive-wheel making 
 one revolution to four sounds renders any other form of 
 grouping than by four difficult. When the engine runs very 
 fast, the sounds seem to rise and fall in intensity at regular 
 intervals. 
 
 A kind of rhythm is also observed in the noise of mill- 
 wheels. The winnowing machine and feed cutter, such as 
 are found upon many farms, produce a rhythmical sound 
 which few persons fail to observe. Long association in early 
 childhood with such rhythms stamps them upon the mind so 
 firmly that they become a mental habit. Children either 
 fancy or perceive rhythms in many sounds ; they indicate 
 this by their attempts to reproduce the sound of machinery 
 or of locomotives. Some railroad engineers believe their 
 engines sing tunes. The same engine under like circum- 
 stances always sings the same tune. 
 
 Several experimenters have also observed this same group- 
 ing of rhythmic sounds. In the work undertaken by 
 Dietze 1 in Wundt's laboratory upon the Umfang of con- 
 sciousness, this rhythmical grouping of the sounds of the 
 metronome was observed and employed to determine the 
 length of the mental span. The grouping was accomplished 
 by intensifying voluntarily certain sounds and subordinating 
 others to it. By grouping the sounds first by eight and then 
 the groups of eight by five, it was possible to grasp forty 
 sounds. Wundt says it is impossible to restrain this group- 
 ing absolutely. It may be confined to a 2-group, beyond 
 which it cannot go within certain limits. Four sec. is the lower 
 limit, and .11 sec. is the upper limit. The most favorable 
 rate is .2 to .3 sec. Wundt refers this grouping to the ripen- 
 ing of the concept on the wave of apperception. As we shall 
 see later, it is possible to restrain this tendency to group 
 sounds. The difficulty was with Wundt's apparatus. The 
 two sounds heard during a complete swing of the pendulum 
 
 1 "Wundt, Physiologische Psychologie, Vol. II. p. 73. 
 
62 BOLTON : 
 
 of the metronome are not of the same intensity or quality, 
 and hence the impossibility of restraining the grouping by two. 
 
 Angell and Pierce, x in their experiments upon attention, 
 state that one subject noticed a rhythm in the sounds with 
 which he felt a tendency to muscular contraction — nodding of 
 the head and beating time with the fingers. 
 
 In neither of these experiments could the experimenters be 
 sure that there was not some difference in the sound which 
 would suggest a rhythm. The importance of an absolutely 
 uniform series of sounds cannot be too strongly insisted upon. 
 A difference in sounds which would ordinarily remain 
 unnoticed, is sufficient to suggest a rhythm. This will be 
 seen when we come to discuss the voluntary changes of the 
 grouping and the ease of suggesting such a change. In the 
 present experiments the greatest precaution was used against 
 any variation in the sounds that would suggest or impose a 
 grouping. The only possible source of such a variation 
 would come from a difference in the resistance between the 
 mercury and platinum. If the mercury were dirty or the 
 platinum points were not sufficiently immersed to form a 
 good contact, or the mercury were to adhere to the points as 
 they were withdrawn, a difference in the intensity of the 
 sound might be heard. The mercury was carefully cleaned 
 every few days, or fresh mercury put in. The platinum 
 points were filed smooth and kept brushed. Strong elastics were 
 attached to each key, so that when the keys were released there 
 was no delay about reacting. If then there were any varia- 
 tions, since there were five sets of keys, it ought to recur 
 every fifth sound ; but as a 5-rhythm was always found very 
 difficult, and a 2, 3 and 4-rhythm easy, we have strong 
 ground for believing that any variations except those which 
 were intended were so small as to have no influence upon the 
 rhythmical grouping. We have, then, the testimony of all the 
 subjects that the clicks seemed uniform in intensity. 
 
 Subject 2 always heard a uniform series for a time after a 
 change of rate, or at the beginning of a new experiment. 
 His tendency to group was so strong that he could avoid it 
 only by imagining some one pounding in the distance, or 
 some objective thing that was perfectly uniform. Sub- 
 ject 3 did not feel any tendency to group the sounds until 
 after he had tried several suggestions. Subject 9, taking a 
 critical attitude, was inclined to believe for a time that the 
 clicks were all of the same intensity. After a few moments 
 it required an effort, which was like " looking long into the 
 
 American Journal op Psychology, Vol. IV. pp. 534 and 539.. 
 
KEYTHM. 63 
 
 future," to avoid a grouping. " I find no rhythm," he says, 
 " as long as I hold my breath and stick to it." When sub- 
 ject 11 gave close and critical attention to the sound, there 
 was no grouping. In order to get a notion of a rhythmic 
 series — one of uniform intensity — subject 12 turned his atten- 
 tion " backward " and saw a series of images to which he 
 was adding one all the time. He throws his attention upon 
 what comes, and studies the nature of the sounds to see if the 
 timbre remains the same. Subject 1 7 says that when each 
 click was attended to separately, they all appeared to be of 
 the same intensity. He said he experienced no such difficulty 
 in avoiding a rhythm as the statement of Wundt had led him 
 to suppose. Subject 25 could group the sounds, but he was 
 more inclined not to do so. If he suggested a grouping, it 
 did not persist. Subject 27 found it more natural to associate 
 the sound with dripping water. Subject 29 made the series 
 appear uniform when he thought of hammering. Subjects 18 
 and 30 could not effect any grouping at all. Upon this 
 evidence we may safely rely upon having secured a series of 
 impressions that was uniform for sensation. It is also true 
 that though the rhythmical grouping of a series of uniform 
 sounds is difficult to avoid, this tendency may be restrained 
 within the limits spoken of by Wundt. Our own experience 
 tallies with those above. When the attention is directed to 
 each single impression, and an attempt made to study the 
 timbre, it is possible to restrain the rhythmical grouping of 
 the sounds. But when the series is attended to as a whole, 
 this grouping takes place involuntarily. 
 
 The character of the sound employed in the experiments of 
 Dietze differed greatly from that used in these experiments. 
 The click of the telephone is about as simple and instantaneous 
 a sound as it is possible to produce. The plate in the 
 telephone vibrates a very short time. For that reason its 
 chief characteristic is intensity ; it does not persist long 
 enough to establish its pitch and timbre. The mind has very 
 little to work upon. It can construct variations only in 
 intensity, for which reason the carrying power is greatly 
 reduced. The sounds can be subordinated with respect to 
 intensity only, and unless great intensive variations can be 
 made, the mind will lose its grasp, and the grouping break 
 up into single impressions. This phenomenon was observed 
 several times, and in particular by subject 15. The sound of 
 the metronome which Deitze employed is full and rich and 
 has greater carrying power. Any experiments upon the 
 carrying power of the mind must take into consideration the 
 character of the sound. Dietze was able, by strong voluntary 
 effort, to carry the grouping much farther than any subject in 
 
64 BOLTON : 
 
 this experiment was able to do with the clicks of the tele- 
 phone. The explanation is to be found partly in a differ- 
 ence between the two sounds and partly in a different method. 
 The subject in these experiments was requested to group the 
 sounds, not by voluntary effort, but only so far as it was 
 found easy and spontaneous. There was no attempt to force 
 the grouping as far as possible, or even to force the grouping 
 at all. It was the spontaneous and involuntary grouping 
 that was studied. 
 
 In a study like this, which is purely introspective, the 
 experimenter must rely upon the integrity of his subjects. 
 There is and can be no test of the accuracy or truth of the 
 results, except the uniformity which they show. If, however, 
 each subject is unaware of the object to be obtained by the 
 experiment, and of the opinions of every other subject, and 
 renders his judgment without any interest in the results or 
 without any preconceived notions of the experiment, the 
 judgments are no more subject to error, and have about 
 the same value as judgments in psycho-physical experi- 
 ments. Certain attitudes, habits, and characteristics of mind 
 do, however, affect results in certain ways which are injurious 
 to the experiment. Some attention was paid to the attitude 
 and method of the subjects in making judgments. A few words 
 in regard to this may not be out of place. There are three 
 classes of psychological subjects. The first includes those 
 persons who yield immediately to any suggestion that is 
 offered. This attitude results, then, from a social practice. 
 In society, people do not wish to antagonize others. They 
 instinctively give assent to any opinion. In an experimental 
 investigation, if the operator will just give the slightest hint 
 of his theory or preference they will add the weight of their 
 opinions. If the operator leads them into giving an opinion 
 which is opposed to his theory, ' ' consistency becomes a 
 jewel;" they stick to their opinion stoutly. If the experi- 
 ment shows plainly that they are wrong and it is preposterous 
 to hold such a view, they make a compromise with their 
 former position and try to excuse themselves for having been 
 led astray. They remain respectfully silent afterward and 
 avoid, if possible, giving an opinion. If they are forced to 
 make a judgment, they do it tentatively ; they are not sure. 
 Of a number of possible views they cannot make up their 
 minds which is the correct one. They generally hair- split 
 until they find out someone's opinion and then agree with that. 
 
 The second class of subjects includes those who take a mod- 
 erately critical attitude. They are concerned in others' 
 opinions in so far only as other • opinions suggest different 
 points of view. They give their own opinions when they 
 
RHYTHM. 65 
 
 have considered all the phases of the experiment that are sug- 
 gested to them. They are unconcerned about the outcome of 
 the experiment. They are not dogmatic ; they might have a 
 different opinion under different circumstances or with further 
 consideration. In the light of the evidence before them, they 
 hold to a certain view. 
 
 The third class includes those persons who are excessively 
 critical. They incline always to an opposite view. The 
 experiment is not conducted properly to suit them ; they are 
 not in their best mood for judgment. They are sure to take 
 ground against some one's opinion. If they cannot get any 
 clue to others' opinions, they are doggedly silent or quibble, 
 and refuse to answer except they qualify their answers to 
 such an extent that the answer means nothing. This class of 
 subjects is intellectually dishonest. If they are compelled 
 to answer, they indulge in hair-splitting differences between 
 their opinions and those of some others. 
 
 When the experimenter is compelled to rely entirely upon 
 the judgment of his subjects, he must study them carefully 
 and use the opinions of certain subjects in so far only as he 
 finds that they harmonize with the general results. It is a 
 fact which every psychologist must understand that certain 
 classes of persons are incapable of introspection. The first 
 class to which we referred are unfitted, because of habits of 
 too free judgment and of always agreeing with others. The 
 third class are rendered unfit for introspection from habits of 
 too free judgment in regard to matters that concern themselves, 
 and from an unnatural bias toward the negative. They are 
 inclined to make too much of their individual opinions. In 
 making out the results, the investigator cannot rely much upon 
 individual opinion. Where there is almost perfect uniformity, 
 the results may be given in tabulated form ; but a large space 
 must be given to merely individual opinion. 
 
 We have then to inquire first in regard to the certainty of a 
 rhythmical grouping of a series of absolutely uniform sounds. 
 The point does not need argument ; the preceding records show 
 how strong is this tendency. Only three out of fifty or more 
 persons tested would agree that it was easier to hear each 
 click separately. In addition to the records given above, 
 several subjects were asked to give a written statement of 
 their impressions of the experiment. In one case definite 
 questions were asked in writing. 
 
 (A) u As far as I can recall my impressions at the different 
 occasions on which I listened to the series of sounds from 
 your apparatus, they appeared to me always as a sequence of 
 groups containing the same number of elements. The excep- 
 tional cases where the impression was that of a sequence of 
 
66 BOLTON : 
 
 single sounds, were those in which the period of the sequence 
 was at its longest. For any given rate there was in general 
 one certain number of elements of which the groups more 
 naturally consisted than any other: but I found, too, that the 
 sequence took on instantly the character of almost any other 
 grouping that was suggested, whether by word or sound. As 
 to the psychological nature of this phenomenon of grouping, 
 it is a difficult matter to give an opinion. I found the effort to 
 determine whether or no there were any recurrent differences of 
 sensation in the sequence a great strain upon the powers of 
 attention. The grouping had in general the appearance of 
 being forced on the mind by the sounds rather than that of 
 being imposed on them by it." 
 
 (B) "A series of clicks may be given in such manner that 
 by giving the closest possible attention they seem to be 
 uniform both as to intensity and interval. This degree of 
 tension (of attention) can, however, be maintained for only a 
 few seconds. When the attention is moderate, the clicks tend 
 to fall into rhythmic groups, the number of clicks falling into a 
 group varying with the rate of the clicks. Slower than a cer- 
 tain rate no rhythm is felt. With more rapid rates two clicks 
 form a group, the accent falling on the first and an interval 
 occurring after the second. Faster still, four clicks form a 
 group with accent, primary on the first and secondary on the 
 third, and an interval after the fourth. This seems a very 
 pleasing rhythm to me, more so than any other. A still more 
 rapid rate gives eight in a group. This becomes visualized 
 quite strongly in my case. It is exceedingly difficult for me 
 to hold the series of clicks out of some of these rhythms. 
 They fall into one or the other types (according to rate) 
 almost irresistibly. At some rates I was able to get a 
 3-rhythm, accented strongly on the first." 
 
 (C) " With regular ticks within certain limits, I do not 
 perceive them as distinct separate ticks, but from the first I 
 group. With slower rates, the grouping is two by two, which 
 passes very easily into four, subdivided into two. With 
 faster rates, the tendency is to perceive the grouping into 
 fours, divided into two, or to perceive the grouping into 
 threes. The quicker the rate, the larger the number of ticks 
 entering into the groups up to about six. Below the lower 
 limit, the ticks are first perceived separately with a tendency 
 to fall into twos, this tendency decreasing as the rate 
 decreases. Above the upper limit, the grouping becomes 
 vague and the tendency is to perceive the ticks as separate 
 and individual. In general the grouping can be changed 
 within certain limits." 
 
RHYTHM. 67 
 
 "The groupings influence one another. There is a tendency 
 to become habituated to a grouping. A grouping heard in 
 one rate is likely to repeat itself in a subsequent rate. It is 
 difficult to be perfectly passive when one knows he is to find 
 a rhythm. ' ' 
 
 (D) ' ' It seems to me easier to group the clicks unless they 
 are very slow ; but I do not find it so difficult to perceive them 
 singly as I should have inferred from Wundt's remarks on 
 Dietze's experiments. Having now tried many times when 
 the grouping was strongly present, subjectively (voluntarily) 
 or objectively, I think I am a little more inclined to discover 
 groupings. It seems to me that I do not lengthen, but rather 
 intensify one or more of the sounds. Perhaps, however, the 
 change is more in quality than in intensity, or perhaps an 
 accompanying impulse of the diaphragm, stress in the men- 
 tal counting, etc., etc. Possibly, however, I do also 
 lengthen the stressed sound at the same time; but the 
 lengthening is not so clear as the stress. I infer from my 
 experience as a subject that the rates from 1 or 2 per sec, up 
 to 6 or 8 per sec. , are best ; probably about 4 per sec. being 
 the best. The fast rates are better for groupings by four, the 
 slower for groupings by two. Three-groups, 5-groups and 
 higher groups do not occur spontaneously with me, though 
 3-groups are not hard to start by counting. Perhaps 2-groups 
 go easiest of all with me. There is a sense of expectation of 
 ' hope deferred ' when the rate is too slow — or, at least, a 
 feeling of 'too slow,' like traveling in a slow train, although 
 you have plenty of time. 
 
 1 ' This probably increases with the length of the group. The 
 span of the respiratory rhythm is exceeded, and instead of 
 being able to tell off a whole foot of the rhythm with one 
 breath, several breaths intervene between those that mark the 
 accented sounds. With small groups and rapid rates there is 
 a feeling of hurry. The motion is too quick and short. There 
 is none of the repose — the swaying, the grace, the easy fulfill- 
 ment of expectation that a slower rhythm possesses." 
 
 This rhythmical grouping was a series of efforts to attend 
 to the sound. The grouping results from a sequence of acts 
 of attention. When the attention is directed to the sensation, 
 it lays hold upon the first impression with great force and 
 makes it the sole object of consciousness. If this were the 
 only sound, the attention would turn to something else, but 
 as succeeding impressions follow before the first wave of 
 attention has subsided, they are seized upon with less force 
 than the first impression, and are subordinated to it in differ- 
 ent degrees according to the strength of the apperceptive act. 
 Subsequent waves of attention follow the same process as lon^ 
 
68 BOLTON : 
 
 as the will directs the attention to the phenomenon. The 
 attention accommodates itself to a certain number of impres- 
 sions, which fall easily within the period of a wave, providing 
 nthere is no objective difference in the impressions. If there 
 is a regularly recurrent difference, this becomes the signal for 
 a new act of attention , providing only that the span does not 
 exceed or fall much under the normal period of a wave. If 
 this recurrent difference follows at too great intervals, the 
 attention breaks up the span in two portions, the one more 
 emphatic than the other. If it follows at too small intervals, 
 these periods fall together into group, first of two and then of 
 larger numbers. The too great interval is marked by a feel- 
 ing of suspense, and the too short interval by a straining 
 after something more. 
 
 The number of uniform elements which may enter into a 
 member of the sequence is not determined wholly by the time 
 interval which separates them. Previous mental habits and 
 associations influence the number of elements in the members 
 of the sequence. All individuals are more habituated to two 
 and its multiples than they are to three. There are also many 
 associations which will suggest groupings by two and four. 
 All ordinary muscular movements follow a rhythm of two. 
 The associations of four are far more frequent than those of 
 three. For this reason to a large extent, groups of two and 
 four prevail. Several subjects have described this effort of 
 attention in a manner which deserves notice and which shows 
 very well the nature of the act. 
 
 Subject 7, speaking of his grouping by eight, says he is not 
 able to ' ' round up ' ' until he comes to eight. There was 
 feeling of completeness about the 8 -group with a certain rate. 
 Subject 9 says there is a slight feeling of muscle tension in the 
 ear, sometimes in the back of the scalp. He attends, relaxes, 
 and attends again. There is an innervation of the muscles 
 connected with attention. Subject 12 describes his feeling 
 about the grouping as a tendency " to go back " when he has 
 heard three or four clicks, as the case may be. This is a 
 *' mouthful " — a unity, and, when he has one, he seeks to get 
 another. Subject 11 describes his feeling as a series of efforts 
 •of attention. He grasps and grasps again Subject 17 says 
 ■each group is attended with a feeling of having v completed a 
 member of the rhythm. The groups stand out as unities — as 
 wholes — and as each group becomes complete, there is a 
 striving for the next. Subject 21: "I attend now to the 
 series of clicks, then relax and attend again. During the 
 strains of attention, I may grasp three or four clicks. A 
 feeling of relief follows each strain of attention. All the mus- 
 
RHYTHM. 69 
 
 cles of the body seem to point toward the source of the sound. 
 They alternately contract and relax," 
 
 This is the rhythm in the attention to which a reference was 
 made above. The view taken, then, was that only one undi- 
 vided state of consciousness might arise during each pulse or 
 wave of attention, and that the number of objects which can be 
 grasped in that state must form an organic unity or be pre- 
 sented as a single object — have the appearance of a unit. 
 
 A given number of auditor]/ impressions within certain- 
 time limits, when presented in such a ivay that there is a 
 kind of subordination among them with respect either to 
 time, intensity, pitch or quality, or with respect to any 
 two or more of these properties, always stand as a unit in 
 consciousness. They form an organic unity which is the 
 essential condition of a number of impressions entering into 
 a state of consciousness. If such organic unity does not exist 
 and it is possible to make it, the mind imposes such an 
 arrangement upon a given number of the elements that they 
 may enter into a state of consciousness. The essential con- 
 ditions of forming such a unity among sounds is a regular 
 temporal sequence within limits which shall be named here- 
 after, and perfect uniformity in intensity, pitch and quality. 
 Eegular variations within limits with respect to intensity,. 
 pitch or quality, or to any two, or to all of these together, 
 will effect a subordination among them sufficient to constitute 
 an organic unity. There is a temporal limit within which 
 these variations must occur in order to form such a unity. 
 
 The test of how many auditory impressions might be 
 grouped together was the ease and pleasure which the subject 
 found in doing so. If he were compelled to keep up a con- 
 stant suggestion of a particular number in order to group the 
 clicks so, noaccount was taken of it. If, after suggesting a 
 grouping, it Should persist until some other suggestion was 
 made, the rate was considered favorable for that form of group- 
 ing. The subjects have described some groupings as most 
 natural, easy or pleasurable, and others difficult or displeas- 
 ing. The groupings which were spoken of as natural, easy 
 or pleasurable, are gathered together in the following table, 
 with the time, to determine what rates have been found best 
 adapted to the different forms of grouping. 
 
 In the following table are brought together the judgments 
 of all those subjects with whom extensive observations were 
 made. The number of the subject is given in the first column 
 at the left hand, and in the columns to the right are given the 
 rates in thousandths of a second, at which a certain form of 
 grouping was found pleasant and easy. The designations at 
 the top of columns 1, 2, 5, 8, 10 and 13 are sufficiently clear. 
 
70 BOLTON : 
 
 The others require further explanation. In column 3 are given 
 those rates at which the subjects found a 2-group more easy, 
 but there was a straining for a larger group, or the 2-groups 
 seemed to group by two. The rate was a little fast for a 
 2-group, and yet it was not more pleasant to group by four. 
 In the same way certain rates were found at which a 3, 4, 6 
 or 8 -group was easier than any other, but it was a little too 
 fast for simply grouping by these numbers, and hence the 
 groups tended to group by two. This was generally spoken 
 of as the " pendulum -swing movement." Still other rates 
 were found at which a 4, 6 or 8-group was more pleasant, 
 and yet the rate was too slow, and the group tended to divide 
 into two smaller groups. In column 15 are given those rates 
 at which there was no distinct grouping — simply a periodic 
 intensive change in the series. Bates at which there was no 
 appearance of a group are given in column 16. 
 
 Multiplying the average rate for each form of grouping by 
 the number of clicks in a group, we get as the length of groups : 
 
 Lower limit for no group, 
 
 1.581 sec. 
 
 Average variation, 
 
 .29 sec. 
 
 Average length of 2-groups, 
 
 1.590 " 
 
 a (< 
 
 .328 " 
 
 it a a g it 
 
 1.380 " 
 
 tt tt 
 
 .204 " 
 
 n tt u a u 
 
 1.228 " 
 
 a it 
 
 .068 " 
 
 it It It Q tl 
 
 1.014 " 
 
 tt it 
 
 .028 " 
 
 a tt it g a 
 
 1.160 " 
 
 a a 
 
 .025 " 
 
 The foregoing table shows that the lower limit for the 
 rhythmical grouping of sounds is near 1.58 sec. Some sub- 
 jects are able at times to group sounds that are separated by 
 this interval, but as a general rule spontaneous grouping has 
 ceased. The records give several instances where the sub- 
 ject has visualized the pendulum with this rate, but he had a 
 feeling that the pendulum reached its full swing before he 
 heard the click. The upper limit at which spontaneous 
 rhythmical grouping ceases cannot be far from .115 sec. 
 Several subjects declared their inability to make definite 
 groups at a rate less than this. Others perceived only a 
 periodic rise and fall in the intensity of the sound ; there was 
 no definite grouping. 
 
 Between these limits there was some form of rhythmical 
 grouping which depended in a large measure upon the rate. 
 The average of all the rates at which a grouping by two was 
 found easy and natural has been taken and multiplied by two 
 to find the average length in time for the 2-groups. The 
 same has been done for groups of three, four, six and eight. 
 The averages for groups of all forms are found not to differ 
 greatly, when we consider certain facts which influence the 
 length of the group. The average length of 2 and 3- 
 groups is somewhat greater than the average for groups of 
 

 1 
 
 2 
 
 3 
 
 4 
 
 ■3.5 
 
 5 
 
 6 
 
 7 
 
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 8 
 
 9 
 
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 11 
 
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 13 
 
 14 
 
 15 
 
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 1152 
 1 140 
 
 
 
 .570 
 .230 
 
 
 
 
 
 .323 
 .208 
 
 .167 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1000 
 
 
 
 .323 
 
 
 
 
 
 
 
 
 
 
 
 
 2 
 
 
 1.002 
 .323 
 .323 
 
 .263 
 
 .263 
 
 .323 
 .263 
 
 
 
 
 
 .208 
 
 
 .167 
 
 
 
 
 
 3 
 
 2 304 
 
 .323 
 .500 
 
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 .760 
 
 
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 1.140 
 
 1.140 
 
 
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 4 
 
 1 060 
 
 1.072 
 
 1.072 
 
 .646 
 .646 
 .536 
 .536 
 
 .323 
 
 .288 
 .268 
 .134 
 
 .208 
 .268 
 .323 
 
 .170 
 .116 
 .156 
 .134 
 
 .116 
 
 
 
 
 
 
 
 
 
 
 5 
 
 
 .780 
 1.440 
 
 
 
 .288 
 .420 
 .323 
 .353 
 
 .208 
 
 
 .156 
 .183 
 .208 
 
 
 
 
 
 
 
 
 
 6 
 
 1 440 
 1.660 
 
 .300 
 
 .780 
 .353 
 .780 
 
 
 .300 
 
 .353 
 
 .288 
 
 .167 
 .156 
 .288 
 .134 
 
 .134 
 
 
 
 
 
 
 .156 
 .156 
 
 .137 
 
 .156 
 
 
 
 1 140 
 1.440 
 
 780 
 
 
 
 300 
 
 
 
 
 
 
 
 
 
 
 156 
 
 
 8 
 
 
 
 
 .300 
 
 
 
 
 
 
 
 
 .167 
 
 .208 
 
 .137 
 
 
 156 
 
 
 
 
 
 
 9 
 
 1.440 
 
 .780 
 .760 
 .540 
 
 .268 
 
 
 .300 
 .134 
 
 .134 
 
 .268 
 
 .156 
 .166 
 .116 
 .116 
 
 
 
 
 
 
 
 
 
 
 10 
 
 
 .*50 
 
 
 
 .268 
 
 134 
 
 .116 
 
 134 
 
 
 268 
 
 134 
 
 
 .156 
 
 
 
 
 
 
 .268 
 
 
 
 .300 
 
 .116 
 
 
 
 .353 
 
 
 
 
 
 
 
 
 
 .780 
 
 
 
 .300 
 
 
 
 
 
 
 
 
 
 
 
 
 11 
 
 
 1.67 
 
 
 
 .268 
 
 .268 
 
 137 
 
 
 .134 
 
 
 
 
 .208 
 
 
 .115 
 
 
 
 
 
 
 
 .500 
 
 .167 
 
 .115 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .250 
 
 .263 
 
 .156 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .268 
 
 .115 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .323 
 
 
 
 
 
 
 
 
 
 
 
 
 12 
 
 1.660 
 1.440 
 
 1.56 
 
 ' .760 
 
 
 
 .156 
 .300 
 
 .156 
 
 
 .115 
 .115 
 
 
 
 .156 
 
 .156 
 
 .115 
 
 
 .115 
 
 
 
 
 
 
 13 
 
 
 
 .288 
 
 
 285 
 
 
 .115 
 
 
 
 .352 
 
 
 
 
 
 
 
 
 
 .352 
 
 
 
 .352 
 
 
 
 
 .780 
 
 
 
 
 
 
 
 
 
 .288 
 
 
 
 .352 
 
 
 
 
 
 .969 
 
 
 
 
 
 
 
 
 
 .268 
 
 
 
 .208 
 
 
 
 
 
 
 
 
 
 
 
 
 14 
 
 
 .780 
 1.440 
 
 
 
 780 
 
 300 
 
 .156 
 
 .285 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .285 
 
 
 
 
 
 
 
 
 
 
 
 15 
 
 
 
 
 
 .300 
 .268 
 
 
 
 .134 
 .116 
 
 .116 
 
 
 .268 
 
 
 
 
 .116 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .134 
 
 
 
 
 
 
 
 
 
 
 - 
 
 
 16 
 
 1.660 
 1.720 
 
 .288 
 .323 
 
 
 
 .156 
 
 .115 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .263 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 .167 
 
 
 
 
 
 
 
 
 
 
 
 
 17 
 
 1.615 
 
 .789 
 .965 
 .969 
 .849 
 .268 
 
 .352 
 
 .624 
 .789 
 
 .352 
 .307 
 .307 
 .500 
 
 .167 
 .208 
 
 
 .167 
 
 
 .624 
 .501 
 
 .167 
 .789 
 
 
 .192 
 .208 
 
 
 
 
 19 
 
 
 
 
 
 .268 
 .268 
 
 
 ...... 
 
 
 
 
 
 
 
 
 
 
 20 
 
 
 
 
 
 
 22 
 
 .780 
 
 
 
 
 .156 
 
 
 
 
 
 .268 
 
 
 28 
 
 1.838 
 
 1.672 
 .969 
 
 
 536 
 
 208 
 
 .167 
 .170 
 
 .134 
 
 .167 
 .116 
 
 .134 
 
 323 
 
 
 
 156 
 
 .137 
 
 .134 
 
 
 
 
 
 .323 
 
 .116 
 
 .323 
 
 
 
 .156 
 
 
 .115 
 
 .... 
 
 
 
 .700 
 
 
 
 .323 
 
 
 
 .134 
 
 
 
 
 
 
 
 
 
 
 
 .969 
 
 
 
 .208 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 1.072 
 
 
 
 .208 
 .268 
 .536 
 
 
 
 
 
 
 
 
 
 
 
 
 Average 
 
 1.581 
 
 .795 
 
 .526 
 
 .542 
 
 .307 
 
 .183 
 
 .134 
 
 .145 
 
 ,125 
 
 .460 
 
 .149 
 
 .161 
 
 .169 
 
 .137 
 
 .127 
 
 
 Avurasje 
 Variation 
 
 .39 
 
 .328 
 
 .204 
 
 .068 
 
 .043 
 
 .025 
 
 .009 
 
 .204 
 
 .028 
 
 .028 
 
 
 
 
72 BOLTON : 
 
 six and eight. The explanation for this is to be sought in 
 the fact that persons are more accustomed to rhythms of two 
 and four than to the longer rhythms. 
 
 The average variation for 2 and 3-groups is greater 
 than for groups of four, six and eight. The associations with 
 the 2-rhythm are far greater than with any other, and these 
 associations tend to suggest the 2-group where it would 
 not otherwise occur spontaneously. Long experience with 
 clocks that vary greatly in their rates of ticking has much to 
 do with the wide limits within which the 2-rhythm is possible. 
 The 3-group is a more rare form of grouping, and only a few 
 subjects succeeded in suggesting it easily. For that reason 
 it is not surprising that the average time of the 3-group 
 should differ greatly from the others. Then the power to 
 carry one or two impressions in the mind is greater, and they 
 can be held longer. The actual span for two clicks in a given 
 time is only a little more than half the span for eight clicks 
 in the same time. In the first case almost half the interval 
 is a pause between the groups, and in the second the pause 
 takes up less than one- eighth of the interval. 
 
 There are several facts, as the records have shown, that 
 tend to make the length of groups vary. Several subjects 
 were predisposed to groupings by four. This number has had 
 a peculiar charm for one from early boyhood. It was his num- 
 ber in school, and ever since, objects that were grouped by 
 four, or that could be grouped by four, have had an especial 
 attraction for him. Four impressions, of whatever sort, 
 always arrest his attention. For this reason he attempted to 
 group all rates by four, even though it required strong effort 
 to do so. With two exceptions, all subjects had the prevail- 
 ing tendency to group by four. A second fact, which in- 
 fluenced probably the grouping to some extent, was that when 
 a subject found it easy to group a given rate by four he 
 became somewhat habituated to a 4-grouping, and was in- 
 clined to group the succeeding rates by four, unless they 
 differed greatly. If a very slow rate followed a faster one, 
 which had been grouped by three or four, the subject tended 
 to imagine intermediate clicks between the actual clicks, and 
 still to group by three or four, as the case might be. ( See 
 the records of subjects 1, 6, 12, 13 and 17.) Taking ail the 
 forms of grouping together, the average time is taken to indi- 
 cate the normal period of a wave of the attention which does 
 not exceed greatly one second. A spontaneous effort of the 
 attention, or with Wundt a wave of apperception, endures 
 about a second or more. We do not, however, hold that 
 there is an absolute psychical constant, even for the individual. 
 No other fact is more certain than that the condition of the 
 
RHYTHM. 73 
 
 subject, as regards fatigue and previous engagement, has 
 much to do with the rate at which a certain group is found 
 pleasant and agreeable. (See the records of subjects 1 and 3. ) 
 
 Before leaving the subject, let us call attention to the 
 averages for groupings that are intermediate between two 
 and four, four and eight, and three and six. The averages 
 for the rates at which these groups were observed lie between 
 the average rates for the groups between which they stand. 
 
 A further method of testing the normal length of a sponta- 
 neous effort of attention was sought in this way. An accented 
 sound every sixth or eighth was introduced into the series, 
 and a number of different rates were tried, until one was 
 found at which the group seemed most pleasing and natural. 
 If the rate was too slow for easy grouping, the subject per- 
 ceived a feeling of suspense. A slower rate still, caused the 
 group to divide into two parts, or at least the subject felt a 
 tendency to divide the group. A still slower rate generally 
 caused the long group to disappear entirely, giving place to 
 a number of small groups which were equal to the long one. 
 If the rate were too fast for easy grouping by six or eight, 
 the groups tended to group by two with a kind of pendulum- 
 swing or wave-like movement. Before trying a subject upon 
 an accented series of six or eight, he was given a number of 
 rates with uniform clicks, beginning with a slow rate. The 
 purpose was to determine to how great an extent the form of 
 grouping changed with different rates, when they were given 
 in close succession. The results of the experiment with a 
 series of uniform rates are given in the first part of the fol- 
 lowing table. The results of the experiment when every sixth 
 click was accented are given in the second part, and when 
 every eighth click was accented, in the third part : 
 
Unaccented Series, Part I. 
 
 Subject 7. 
 
 Subject 16. 
 
 Subject 3. 
 Subject 4. 
 
 Subject 10. 
 
 Subject 13. 
 
 Subject 16. 
 
 ■Subject 9. 
 
 Subject 17. 
 Subject 5. 
 
 .323 
 
 (.268) 
 4-group. 
 
 Tends slightly 
 to 8-group. 
 
 2 -group. 
 
 3-group. 
 
 .268 
 4-group. 
 
 Pleasant. 
 
 4-group. 
 
 Pleasant. 
 
 2 -group. 
 
 Groups rise 
 
 and fall. 
 
 2 or 
 4-group. 
 
 4-group. 
 
 Tends slightly 
 
 to double 
 
 4-group. 
 
 .78 
 2 -group. 
 
 .263 
 4-group. 
 
 Strongly 
 tends to 8. 
 
 4-group. 
 
 Double 
 3-group. 
 
 .208 
 
 4-group. 
 
 2 or 
 4-group. 
 
 .208 
 8-group. 
 Pleasant. 
 
 .353 
 4-group. 
 
 .17 
 4-group. 
 
 Confused. 
 
 .156 
 6 -group. 
 Pleasant. 
 
 4-group. 
 
 Groups rise 
 
 and fall by 
 
 two. 
 
 3 or 
 
 4-group. 
 
 Wavers 
 between 
 
 4 and 
 8-group. 
 
 .167 
 
 Groups not 
 
 separated. 
 
 Confused 
 
 feeling. 
 
 6 -group 
 
 Not so easy as 
 
 with the 
 following rate 
 
 3-groups. 
 
 Groups by 
 two. 
 
 .134 
 4-group. 
 
 8-group. 
 Pleasant. 
 
 4-group. 
 
 Strongly 
 towards 8. 
 
 8-group. 
 Illusive. 
 
 .183 
 8-group. 
 
 .137 
 
 More 
 confused 
 
 feeling. 
 Accented 
 
 double 
 6-group. 
 
 6 -group. 
 
 Groups by 
 
 two. 
 
 .116 
 4-group. 
 
 Groups by 
 two. 
 
 8-group. 
 
 Groups by 
 
 two. 
 
 8-group. 
 
 Biviles into 
 two 4-groups. 
 
 8-group. 
 Divides into 
 two 4-groups. 
 
 8-group. 
 
 .156 
 8-group. 
 
 Accented 6-Group, Part II. 
 
 Subject 6. 
 
 Subject 11. 
 
 Subject 16. 
 
 .323 
 
 4-group. 
 
 In spite of 
 accent. 
 
 6 -group. 
 
 Two 3 groups 
 Span disagree- 
 ably long. 
 
 .263 
 
 6 -group. 
 
 Suspense 
 tends to 
 3-group. 
 
 6 -group. 
 
 Tends to a 
 
 4-group. 
 
 .208 
 
 6 -group. 
 Difficult. 
 
 .167 
 
 6 -group. 
 
 Pleasant. 
 
 6 -group. 
 Pleasant. 
 
 6 -group. 
 
 Divides into 
 two 3-groups. 
 
 .137 
 
 6 -group. 
 
 Groups by 
 two. 
 
 6 -group. 
 
 Groups by 
 
 two. 
 
 6 -group. 
 
 Pleasant. 
 Pendulum- 
 swing 
 movement. 
 
RHYTHM. 
 Accented 8-Groups, Part III. 
 
 75 
 
 Subject 4. 
 
 .268 
 4-group. 
 
 .208 
 
 .17 
 4-group. 
 
 .134 
 
 Two 
 
 4-groups. 
 
 .116 
 8-group. 
 
 Subject 10. 
 
 4- group. 
 
 
 8-group. 
 
 Requires 
 
 effort. 
 
 8-group. 
 
 Not 
 animating. 
 
 8-group. 
 Harmonious. 
 
 Subject 11. 
 
 
 4-group. 
 
 Accents 
 disturbing. 
 
 8-group. 
 
 Accents 
 disturbing. 
 
 8-group. 
 
 Not pleasant. 
 
 8-group. 
 
 Pleasant. 
 
 Subject 13. 
 
 
 8 -group. 
 
 Not complete. 
 Two 4-groups. 
 
 8-group. 
 
 Divides into 
 two 4-groups. 
 
 8-group. 
 Pleasant. 
 
 8-group. 
 
 Groups by 
 two. 
 
 Subject^. 
 
 8 -group. 
 
 Really 
 
 4-groups. 
 
 Great 
 
 suspense for 
 
 8-group. 
 
 8 -group. 
 
 Distasteful 
 feeling of 
 suspens3. 
 
 
 8-group. 
 
 Divides into 
 
 two 4-groups. 
 
 Span too 
 
 long. 
 
 8-group. 
 
 Pleasant- 
 
 With the unaccented series, the 6-group was found natural 
 twice near the rate .167 sec. When every sixth sound was 
 accented, the most pleasant rate for the 6-group was .167 sec. 
 At the rate .137, the 6-groups group by two. At the rate 
 .208 sec, they were difficult to grasp. At slower rates, there 
 was a feeling of suspense, or the group tended to divide into 
 two 3-groups, or the subject was more inclined to group by 
 four in spite of the accent. According to this, the 6-group is 
 found most natural and pleasant at the rate .167 sec. By 
 multiplying this by six, we will get as the time limit for the 
 6-group 1.002 sec. 
 
 With uniform series, the 8-group was found most natural 
 and pleasant, once at the rate .208 sec, once at the rate .134 
 sec and twice at the rate .116. When every eighth was 
 accented, the 8-group was found most pleasant at the rates 
 .134 and .116 sec The average rate for all is .130 sec, 
 which, when multiplied by eight, gives 1.04 sec, the time 
 limit for the 8-group. The difference between this and the 
 time for the 6-group is very small, and at the same time they 
 agree very well with the times for the same groups in the pre- 
 ceding table. The general fact of certain rates being better 
 adapted to certain forms of grouping is pretty well established. 
 This adaptation of a particular form of grouping to a certain 
 rate depends upon the fact that the length of the group cor- 
 responds to the normal period of a wave of attention. The 
 lack of adaptation results from cutting short the normal wave. 
 For a fuller account of the different states of feeling arising 
 
76 BOLTON : 
 
 with different rates for a certain group, the reader is referred 
 to the records of the experiments upon subjects 10, 11, 13 
 and 16. 
 
 The conscious state accompanying each wave of attention 
 grasps together or unifies all the impressions that fall within 
 the temporal period of a wave. As the result of a series of 
 attentive efforts, a series of auditory impressions takes the 
 form of a sequence of groups. This rhythmical grouping is 
 due to the unifying activity of the mind ; it is an attempt to 
 conceive a series of sounds in a simpler form. When the 
 mind acts upon a continuous series of auditory impressions, 
 it groups all the impressions that fall within the period of a 
 wave of attention, and conceives them as a single impression 
 or a unity. Each succeeding wave groups a like number, so 
 that the series is conceived in the form of groups. If the 
 single impressions are separated by a greater time interval 
 than the normal period of a wave of attention, each impression 
 stands alone as the sole object of consciousness. But what 
 becomes of the series when the rate is too fast for rhythmical 
 grouping ? A partial answer is to be found in the fact that 
 the clicks show a regular periodic rise and fall in intensity. 
 There was no separation among the groups ; no definite 
 number of impressions constituted the group. The view to 
 which least objection can be offered, but which is unsupported 
 at the same time by any positive evidence, is that when the 
 sounds become too rapid to find expression in muscular con- 
 tractions of any kind, they can be no longer separated from 
 one another as simple impressions. 
 
 The most rapid rate 1 of voluntary control is about ten per 
 second. This periodic rise and fall in the intensity of the 
 clieks simply marks the waxing and waning of the attention. 
 The changing intensity of the sounds indicates the changing 
 degrees of clearness in the conscious state. If the clicks are 
 separated by more than one- tenth of a second, the groups are 
 separated by an interval ; at least, there is the feeling of an 
 interval. Below this limit of one-tenth of a second, the clicks 
 preserve their individual character. They do not fall suffi- 
 ciently near together to appear continuous. They preserve 
 their temporal succession, and as before appear in different 
 strengths according to the degree of clearness in the conscious 
 activity. The conscious state, which seems to ride upon the 
 crest of the wave — that is, appear when the attentive effort is at 
 its strongest — fades gradually and conceives the last elements 
 in the group with less clearness than the first, and with the 
 coming of a new wave of attention, the first impression is laid 
 
 1 " Some Influences which Affect the Rapidity of Voluntary Move- 
 ments." F. B. Dresslar. Am. Jour, of Psychol. Vol. 4, p. 516. 
 
RHYTHM. 77 
 
 hold, upon with great force, and appears stronger in contrast 
 with the last in the preceding group. 
 
 This rhythm in the attention, and hence in conscious activ- 
 ity, finds its counterpart in the activity of the nerve cell, 
 which we have seen reason for believing was a series of explo- 
 sions — an alternation of periods of activity and periods of 
 repose. 
 
 The subject invites speculation, but we forbear except to 
 offer the further supposition that with rates slower than ten 
 per second, the interval or pause between the rhythmical 
 groups marks a period of perfect quietude in the cell. When 
 the rate reaches ten a second or more, there may still be a 
 period of absolute inactivity, but no less interval than a tenth 
 of a second can cause a real break in the conscious state or 
 no less interval becomes an " object of consciousness." The 
 change from one state of consciousness to another is repre- 
 sented by the reversal of a muscular movement. If between 
 two impressions there is not sufficient time or time equal to 
 the reversal of motion in a member, there is no consciousness 
 of an interval between the impressions. The thought of the 
 interval is a deduction and not a sensation or conscious fact 
 — a fact revealed by the immediate conscious state itself. 
 The conscious state disappears when the activity in the cell 
 ceases ; and when the will directs the attention to the series of 
 impressions, the conscious state tends to disappear when it 
 has effected all the subordinations that are possible among the 
 impressions that fall easily within the normal period of a 
 wave of attention. 
 
 Another phenomenon, which was observed by several sub- 
 jects and by the experimenter at different times, was the 
 apparent slowing up of the rate. The feeling was one of 
 extreme suspense, and was described as ' ' awful ' ' and 
 "dreadful." There was no apparent regularity with which 
 the slowing up occurred and no definite time that the feeling 
 lasted. The only fact which was observed concerning it was 
 when the attention was diverted, the feeling disappeared. 
 Several suppositions occur to us as explanations, but none of 
 them seems to be completely satisfactory. It appears to be 
 more in the nature of fatigue, but it is not clear why the 
 impression should seem to be separated by longer intervals. 
 The general fact, however, of time passing more slowly, when 
 one is suffering from fatigue, has been observed frequently. A 
 more probable supposition is that it indicates a kind of 
 rhythm in the voluntary effort which directs the attention to 
 the source of the sound. 
 
 We have now to ask what is the inherent nature of a 
 rhythmical group, or what is meant by a unity among 
 
78 BOLTON : 
 
 a number of auditory impressions. "What relation must 
 the impressions bear to one another that they may be 
 grouped together or grasped by a single act of apperception* 
 How may a number of impressions become the object of a single 
 state of consciousness 1 ? With Plato, we ask how the many 
 become the one, or with Kant, how the mind makes a unity 
 out of a manifold. Upon the basis of this study, we can hope 
 to answer the question with regard to auditory impressions 
 in a sequence. The question has already been answered for 
 simultaneous sounds — musical tones — in the laws of harmony. 
 The general principle as laid down in the treatment of poetry 
 was that by coordinating and subordinating the elements to 
 one another, unities were effected among them. The same 
 principle holds good here. 
 
 From the nature of the apparatus, only changes in the 
 intensity of the clicks could be effected. For this reason the 
 subordinations and coordinations among the sounds must be 
 accomplished through different intensities. Two methods for 
 determining the relations of the sounds in a group with 
 respect to their intensities were employed. By the first each 
 subject was asked how he effected a grouping in a series of 
 sounds which were of uniform intensity, and, if by accent, 
 what sounds in the groups were accented. By the second 
 method, the subject was given a series of sets of sounds of 
 different intensities, which recurred always in the same order, 
 and he was asked to point out where the series was grouped 
 — the position of the strong and weak sounds in the group. 
 In this way we were able to determine what was the most 
 natural order in which the different intensities occurred in 
 the group. 
 
 By the first method, it was determined that : 
 
 The first sound in the 2-group was accented. It was possi- 
 ble by objective suggestion of tapping, or counting, or by 
 voluntary effort, to accent the last sound, but no subject 
 would agree that this was the natural accent. 
 
 The first sound in the 3-group was strongly accented and 
 the second slightly. Occasionally a subject found it easier 
 to accent the second more strongly than the first, but 
 this did not seem to be the natural way of accenting the 
 group. It was possible by voluntary effort, or objective sug- 
 gestion, to change the position of the accent. Very few sub- 
 jects found it easy to group by three, and it usually required 
 a strong suggestion to start the group. 
 
 The 4- group was very generally accented upon the first and 
 third sounds ; the first was stronger than the third. There 
 was, however, some difference of opinion. Several subjects 
 found it easy and natural to accent the second and fourth, and 
 
RHYTHM. 7$ 
 
 subject 15 was more inclined to this form of accent than to 
 the other. Sometimes there was only a single click accented, 
 and this was very generally the first. The accents could be 
 changed voluntarily. The reader is referred to the records of 
 subjects 1, 2, 6, 7, 9, 10, 11, 13, 15, 16, 17, 20. 
 
 Most subjects preferred a grouping by four to one by three. 
 When the attempt was made to suggest a 3-group by counting 
 three, they felt an over-powering tendency to count one or 
 three a second time. Thus : 1, 2, 3, 1 — 1, 2, 3, 1 — 1, 2, 3, 1 
 —or 1, 2, 3, 3 — 1, 2, 3, 3 — 1, 2, 3, 3. The former was the 
 more common. Subjects 1, 4, 7, 11, 12, 13, 15, 17 and 20 
 mentioned this phenomenon. 
 
 The 5-group was very difficult to suggest and maintain. 
 Most subjects declared their inability to get such a grouping. 
 Subject 11 said that an extra click would attach itself to the 
 group and "pull it over" to a 6-group. Subject 17 mentioned a 
 similar phenomenon. In counting a 5-group, it was found 
 easy to emphasize the first and third or the first and the 
 fourth. This gave to the 5-group the appearance of being 
 compounded of a 2-group and a 3-group. Subjects 10, 11, 12, 
 15, 16 and 17 make observations on their attempts to suggest a 
 5-group. 
 
 The 6 and 8-groups were generally compounded of smaller 
 groups of two, three or four. The 6-group was composed of 
 two 3-groups or sometimes three 2-groups. The first group 
 in the 6-group was more emphatic or was accented. The 
 8-group was composed of two 4-groups or sometimes four 
 2-groups. Subject 13 thought that the intensities of the 
 sounds in the 8-group decreased from the beginning to the 
 end. 
 
 Higher grouping of these groups was possible to some 
 extent. The most common form was to group by two. This 
 was spoken of as the pendulum- swing movement. In this case, 
 the first group was always accented. Subjects 1, 10, 12, 13, 
 15 and 16 make observations upon their attempts to group 2 
 and 3-groups. The record of subject 16 is especially impor- 
 tant. Several were unable to group 4-groups beyond two, on 
 account of their inability to keep the accents clear. In general 
 all subjects made a kind of interval between the groups. In 6 
 and 8-groups, which were compounded, a short interval fol- 
 lowed each smaller group and a longer interval followed the 
 whole group of six or eight. 
 
 Various methods of suggesting a grouping were employed. 
 The most frequent method was by counting or beating time 
 with the fingers. Subject 17 says: " Subjective counting is 
 most effective, or this assisted by respiratory stresses and 
 probably other muscular movements." The associations 
 
SO BOLTON : 
 
 which the sound brought up, very frequently suggested a form 
 of grouping. The clock (various kinds), pendulum, locomo- 
 tive, conical pendulum and revolving wheel, making a certain 
 number of sounds during a revolution, are most frequently 
 mentioned as influencing the form of grouping. The operator 
 frequently directed the attention of the subjects to respiration, 
 or asked them to feel the pulse. Most of the subjects incline 
 to the view that respiration accommodated itself to the form 
 of grouping that was found most natural with the rate to 
 which they were listening. Inhalation and exhalation each 
 lasted during the time of a 4-group. In this way a kind of 
 higher grouping was accomplished, for the clicks heard dur- 
 ing inspiration were more intense. When the rate was slow 
 both inspiration and expiration were accommodated to the 
 time of one click. 
 
 "With fast rates, the pulse acted as a suggestion. All the 
 clicks falling between two heart- beats were grouped together, 
 the click coming nearest in time to the heart-beat being 
 accented. Subjects 2, 4, 9, 10, 11, 13, 15, 17 and 25 make 
 observations upon this subject. 
 
 When the subjects were allowed to hear the sound of the 
 chronograph, which was distinctly rhythmical, no other 
 grouping was possible. The reader is referred to the records 
 of subjects 2, 3, 9, 11, 16, 19 and 23. 
 
 This general conclusion seems to be warranted : In the 
 presence of any fixed rhythm within limits, or of objective 
 suggestion, the series was grouped according to the sugges- 
 tion, and it was found difficult, if not impossible, to suggest 
 any other grouping. The grouping would follow the stronger 
 suggestion. 
 
 Certain rates were more favorable than others for voluntary 
 changes of the forms of grouping. Subjects 4, 6, 13 and 15 
 mention these rates respectively as especially favorable for 
 voluntary changes : .323 sec, .353 sec. and .268 sec. Sub- 
 jects 1, 2 and 16 thought that the grouping changed easily 
 when they were fatigued. When a very weak accent was 
 introduced every third in the series, subjects 4 and 13 did 
 not detect the accent, but grouped the series by three, and 
 were unable to suggest any other form of grouping ; but they 
 could not tell why the series grouped this way. Subjects 6, 
 9, 11, 12, 13, 15, 16 and 17 make observations upon easy 
 changes of the form of grouping. 
 
 The second method of determining the nature of rhythmical 
 groups was to give the subject a series which was composed 
 of a regularly recurrent set of sounds of different intensities. 
 Sets of two, three and four different intensities in groups of 
 two, three, four and five were studied. Very few observa- 
 
RHYTHM. 81 
 
 tions were made upon 5-groups. To make a graphic repre- 
 sentation of such series of sounds, let A, B, C and D represent 
 the four intensities of sound, A the strongest, and D the 
 weakest. By using only two intensities (A B) it is possible 
 to form the following series of sounds : 
 
 2-groups. ABABABAB (1) 
 
 q .rwvr,™ / ABBABBABB (2) 
 
 3-groups. JAABAABAAB (3) 
 
 (ABBBABBB (4) 
 
 4-groups. -^AABBAABB (5) 
 
 (.AAABAAAB (6) 
 
 Of 5-groups, these only were tried : 
 
 ABBBBABBBB (7) 
 
 ABABBABABB (8) 
 
 A A B A B A A B A B (9) 
 
 The question was to determine where the mind most 
 naturally made the division into rhythmical groups. The 
 first series might divide in two ways, thus : A B — A B, 
 or B A — B A. The second in three : A B B — A B B, or 
 B A B— B A B, or B B A— B B A. Details regarding the 
 others are unnecessary. Of series composed of three intensi- 
 ties, the following out of all the possible forms were thought 
 to be characteristic, and were tried : 
 
 3-£rrom>s / ABC ABC ABC 
 
 6 groups. | ACB ACB ACB 
 
 4-groups. ACBC ACBC ACBC 
 
 Of series of four intensities, the following out of the many 
 possible forms were tried : 
 
 m™™. / ABCDABCD 
 
 -groups. | ADCBADCB 
 
 In the following table are given the rhythmical groups which 
 each subject made of the series upon which he was tried. At 
 the top of the table, in each column, are letters which indicate 
 the order in which the different intensities recurred in the 
 various series. The number of each subject is given in the 
 left-hand column. If a subject has given a stronger intensity 
 to a click than it actually possessed (said that a B intensity 
 was equal to an A, or a C to a B), it is printed in full-faced 
 type. Where a subject has remarked upon a longer interval, 
 either following or preceding the strongest so and, this is 
 indicated by placing a dash either before or after the strong 
 sound : 
 

 
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RHYTHM. 83 
 
 At the bottom of each column is given the form of group 
 which is generally made when the series is formed in the way 
 indicated by the letters at the top of the column. Two factors 
 seem to operate in determining where the series shall be 
 divided into groups. The group must begin either with 
 a very intense sound or close with a very weak one. The 
 subject strives either to put all the strong sounds as near the 
 beginning as possible, or all the weak ones as near the close 
 as possible. There are three cases where these principles 
 are brought into strong conflict. The first is where the series 
 is composed of three intensities, in the order of A C B or G 
 B A. Either the strongest cannot come first, or the weakest 
 last. The weakest generally comes last and the strongest 
 second; the second being the position of the secondary 
 accent in a musical rhythm. The other form which is com- 
 mon and sometimes preferred, places the strongest first and 
 the weakest second. This does violence to both the weakest 
 and middle intensities, by placing an unaccented sound in a 
 position that requires an accent, and an accented sound in a 
 place where an accent does not occur. A second case is where 
 the series is composed of four different intensities in the order 
 of A D C B or D C B A. The strife would be greater here 
 than in the first case, if it were not for the fact that the third 
 position may frequently receive the sound of the greatest 
 intensity. The most common form is to place the weakest 
 sound last, and the strongest in the third place. This of 
 course leaves the first place occupied by an unaccented 
 sound, though this sound is stronger than the last. Subject 
 9 makes the strength of the first equal to that of the second, 
 and thus harmonizes the group somewhat with the 4-group, 
 which is formed of uniform sounds. The third case is where 
 the series is formed of a sequence of 4-groups of three differ- 
 ent intensities, thus : A C B C. There is really no strife 
 here, except that the strongest sound often appears in the 
 third place. There are some irregularities, but none sufficient 
 to require special notice. The general principle just laid 
 down is well illustrated in the last two forms of the 5-group, 
 when composed of two intensities of sound. 
 
 When two or more strong sounds, standing together, are 
 followed by a weaker sound, the sound which is followed 
 immediately by a weaker one appears stronger in contrast 
 with the following weaker sound than the preceding, which is 
 actually of equal strength. This will be observed in every 
 case with 4-groups composed thus : A A A B. And in 
 one case, with the 3-group composed thus : A A B. The 
 third sound in the 4-group and the second sound in the 
 3-group appear to be stronger than the preceding sound. A 
 
84 BOLTON : 
 
 farther fact to which attention is called, is the long interval 
 which appears between the groups. The pause seemed to be 
 due to the fact that a long interval generally preceded the 
 accented sound. At the same time some subjects, especially 
 
 10 and 15, make a short interval after the strongest sound. 
 To most subjects, the strongest sound seemed longer than 
 the rest. With some this was more apparent than with 
 others. Subjects 1, 3, 4, 10, 11, 13, 14, 15, 24, 27 and 28 
 either confound the accented click with a longer interval, or 
 make the louder click seem longer than the others. Subject 
 
 11 speaks of the strongest sound spreading itself over the 
 rest. It is possible by voluntary effort to avoid the illusion 
 of a longer interval, either preceding or following the accented 
 sound, but ordinarily it was very clear. When the strength 
 of all the sounds in the series was increased, the rate seemed 
 slower. Subject 27, especially, makes this observation. 
 When these accented 3 and 4 groups were given at a fast rate 
 (.134 sec), the separate clicks seemed to fuse into a single 
 impression, which grouped generally by four. 
 
 The different intensities of sound bore no special relation 
 to one another ; the strongest was clearly discernible from the 
 second, and the second from the third, and so on. When in 
 a series of impressions of the third (C) intensity, the strongest 
 (A) was introduced every fifth, it seemed to appear as an 
 extraneous sound which would not group with the others. 
 (See records of subjects 9 and 11). It appeared from several 
 other records also that sounds differing greatly in intensity 
 would not easily group together. When a very weak accent 
 was placed upon every third sound, subjects 4, 13 and others 
 did not discover the accent; they expressed their inability to 
 group the series in any other way, but could not understand 
 the reason. Subjects 13, 16 and 17 expressed the opinion 
 that strong accents were disagreeable ; they preferred their 
 own accents to real accents of any strength. Eeal accents did 
 not seem to form so harmonious a group as did the accents 
 which the subjects put in themselres. 
 
 As a further investigation into the nature of rhythmical 
 groups, especially with reference to poetical rhythms, it was 
 proposed to employ sounds of which the length or endurance 
 might be varied. The click of the telephone is almost 
 instantaneous. The disk probably makes a very few vibra- 
 tions. We are indebted to Dr. E. C. Sanford for devising 
 and constructing an apparatus, which served the purpose 
 admirably in some ways. The principle involved in this 
 apparatus was simply interrupting the sound of an electric 
 tuning fork, which was placed before the opening to one of 
 Helmholtz's resonators. When a card is placed over the 
 
KHYTHM. 
 
 85 
 
 opening into the resonator, which is near a tuning fork of the 
 same pitch, the sound of the fork is rendered almost 
 inaudible. Regular interruptions result in a series of uniform 
 sounds and silences. 
 
 Figure IV. 1 
 
 For this experiment were required an electric tuning fork 
 and a set of disks with notches cut in the circumference. 
 The resonater rested horizontally, supported by a stative 
 near the edge of a small table, upon which the tuning fork 
 was placed. The fork and the resonator were placed at the 
 same height, with just enough space (about half an inch) 
 between the end of the fork and the opening of the reso- 
 nator to allow a pasteboard disk to pass without interference. 
 This disk was about twenty inches in diameter, and placed 
 at just the proper height to cover up the opening into the 
 resonator. Notches were cut in the circumference of the 
 disk in such a way that when it was revolved the opening 
 into the resonator was now closed and now open. With a 
 regular revolution of the disk, and with notches of an equal 
 number of degrees, and equal spaces, a series of sounds, uni- 
 form in length, pitch and intensity, would be produced. To get 
 sounds of different lengths, some notches were made to cover a 
 greater number of degrees of the circumference than others. 
 
 1 Thls represents the apparatus as it has since been perfected by 
 Dr. Sanford. 
 
86 BOLTON : 
 
 The number of degrees in some cases was twice that of others. 
 By cutting the notches upon the arc of a circle, and at just a 
 sufficient depth to cover a part of the opening of the reso- 
 nator, it was possible to decrease the strength of the resonance, 
 and thus get a sound of less intensity. This gave the effect 
 of an accent upon certain sounds by weakening others. 
 
 The following are the forms of disks that were thought to 
 be characteristic. Just enough space was left between the 
 notches to cause a silence in the sound of the fork. The 
 spaces were always of the same number of degrees in a given 
 disk. Notches were cut in the circumferences of the disks 
 as follows : 
 
 1. Two notches, each of 150 degrees. One accented. 
 
 2. One notch, 200 degrees, and one, 100 degrees. 
 
 3. One notch, 200 degrees — accented — and one, 100 de- 
 grees. 
 
 4. Three notches, each of 100 degrees. 
 
 5. Three notches, each of 66 degrees. The spaces of 40 
 degrees. 
 
 6. Three notches, each of 100 degrees. One accented. 
 
 7. One notch, 120 degrees, and two, each of 60 degrees. 
 
 8. One notch, 120 degrees — accented — and two, each of 60. 
 
 9. Four notches, each of 60 degrees. Strong accent upon 
 the first, and weak upon the third. 
 
 The question was to determine where the rhythmical groups 
 began, with the long or the short sounds. As the pause 
 between the successive sounds was the same length, it is a 
 matter of interest to determine what effect the rhythmical 
 group had upon the pause coming after the sound with which 
 the group closed. 
 
 The results of the experiments with the different series of 
 sounds produced by the disks, as described above, are given 
 in the following table. A long sound is indicated by a capital 
 letter, and a short one by a small letter. In disk 9 the ac- 
 cented sounds, which were of different intensities, are repre- 
 sented, the stronger by a bold faced A, and the weaker by a 
 bold-faced B. An accented sound is given in full-faced type. 
 In turning the disk, the operator sought to keep a uniform 
 speed at a moderate rate — about one turn to the second : 
 
RHYTHM. 
 
 87 
 
 
 2-Geoups. 
 
 3-Groups. 
 
 4-Grocps. 
 
 
 1 
 A A 
 
 2 
 
 A a 
 
 3 
 
 A a 
 
 4 
 
 AAA 
 
 5 
 
 AAA 
 
 6 
 
 AAA 
 
 7 
 
 A a a 
 
 8 
 
 A a a 
 
 9 
 
 A A S A 
 
 1 
 
 3 
 
 4 
 
 7 
 10 
 11 
 
 15 
 17 
 
 18 
 
 27 
 28 
 
 A A A A 
 
 A A 
 AA A A 
 
 A A 
 
 A A 
 
 A A 
 
 a A 
 
 A a A a 
 
 a A 
 
 a A 
 A a 
 
 a A 
 a A a A 
 
 a A 
 
 a A 
 
 a A 
 
 a A- 
 
 a A 
 
 a A 
 
 A a 
 
 a A 
 a A 
 
 a A 
 a A 
 a A 
 
 AAA 
 A A A A 
 
 A A A A 
 AAA 
 
 AAA 
 A A A A 
 
 A A A A 
 
 A A A A 
 
 A A A A 
 AAA 
 
 AAA 
 
 AAA 
 A A A A 
 
 No group 
 
 AAA 
 
 A A A A 
 
 AAA 
 
 AAA 
 
 AAA 
 AAA 
 AAA 
 
 A A -A 
 
 AAA 
 
 AAA 
 
 A A A- 
 AAAA 
 
 AAA 
 AAA 
 
 a a A 
 
 A a a 
 a a A 
 
 a a A 
 
 a a A 
 a a A 
 A a a 
 
 a a A 
 
 a a A 
 a a A 
 a a A 
 
 a a A 
 a a A 
 
 a a A 
 
 A a a 
 
 a a A 
 a a A 
 
 a a A 
 
 A A B A 
 
 B A A A 
 
 B A A A 
 A A B A 
 
 A B A A 
 
 A A B A 
 
 Groups 
 prefer'd. 
 
 A A 
 
 a A 
 
 or 
 
 a A 
 
 4- group 
 
 or 
 
 3 -group 
 
 AAA 
 
 
 a a A 
 
 a a A 
 
 A A B A 
 
 Several facts are to be observed in this table. First, a 
 series of sounds of uniform length and intensity may be 
 grouped by two, three or four. With disk No. 4, while the 
 most common form of grouping was by three or four, by 
 turning very slowly it was possible to group by two, or by 
 turning faster to group by six or eight. With No. 1 it was 
 easy to group by two or four by turning slower or faster. 
 When disk No. 9 was turned at a slow rate, the sounds were 
 grouped by two, at a faster rate by four, and at a still faster 
 rate the 4-groups were grouped by two or by four. 
 
 Second, a more intense sound occurring regularly, imposes 
 a grouping according to the number of sounds between the 
 accents. The accented sound comes first in the 2 and 3-groups, 
 and in the 4-group the first and third receive accents. The 
 first is more strongly accented than the third. 
 
88 BOLTON : 
 
 Third, a longer sound occurring regularly in the series, 
 imposes a grouping according to the number of sounds 
 between the longer ones. The long sound, as a rule, is 
 the last in the group, and is frequently accented. It was 
 possible for most subjects to change the place of the long 
 sound to the first of the group, but with the exception of 
 subject 11, it was difficult to keep it at the beginning of the 
 group. Most subjects remarked upon the long interval or 
 pause which seemed to follow the long sound, and for this 
 reason it was found difficult to make the close of the group 
 come at any other place. When the attempt was made to 
 begin the group with the long sound, the preceding group 
 would not seem to separate from the following ; the two 
 would run together and become indistinguishable. In the 
 telephone experiments, when a subject attempted to suggest 
 a 3-group, which was accented upon the third by counting 
 one, two, three, emphasizing three, it required the closest 
 attention to make the group close with three, for the emphatic 
 three would begin the group thus : Three, one, two, etc. 
 
 Although it was impossible to control the rate, faster rates 
 than common caused these groups to group by two or four. 
 
 The accented long sound frequently appeared more pro- 
 longed than the unaccented sound of the same length ; the 
 accent had the effect both to increase the length of sound and 
 of the interval which followed. 
 
 When the short sound in disk No. 2 and the last short 
 sound in disk No. 7 were accented, the accented sound always 
 came first and the long sound last. It was more difficult 
 with this arrangement to place the long sound first and the 
 accented last, than before. 
 
 The results of this experiment confirm in part the results 
 of previous experiments concerning the nature of rhythmical 
 groups. First, the accented sounds occupy the first place in 
 the group. Second, the weaker accent comes upon the third 
 sound in the 4-group. Fast rates with accented groups 
 caused them to fall into higher groups, first of two, and then 
 of three or four. 
 
 We come now to the consideration of the nature of the 
 rhythmical group. The general principle is this : In a 
 series of auditory impressions, any regularly recurrent im- 
 pression which is different from the rest, subordinates the 
 other impressions to it in such a way that they fall together 
 in groups. If the recurrent difference is one of intensity, the 
 strongest impression comes first in the group and the weaker 
 ones after. If the recurrent difference is one of duration, the 
 longest impression comes last. These rules of course hold 
 good only within the limits spoken of above. When the im- 
 pressions are uniform in length and intensity, the mind 
 
 J-t'/C. 
 
BHYTHM. 89 
 
 enforces a grouping by giving fictitious values to the impres- 
 sions, generally with respect to intensity, but sometimes with 
 respect to duration. At the rate .795 sec, the mind intensi- 
 fies every other sound, so that the series is grouped by two. 
 The second sound in the group is subordinated to the first. 
 At the rate of .460 sec, the mind finds it easy to group a 
 series of auditory impressions by three, by intensifying the 
 first greatly and the second slightly, so that the second is 
 subordinated to the first and the third to the second. More 
 than three degrees of intensity do not appear together in the 
 order of their intensities in a series. In grouping by four, 
 which takes place generally at the rate .307 sec, the mind 
 accents the first strongly and the third slightly. The second 
 and fourth impressions are generally of the same intensity. 
 If there is any difference in intensity, the second is stronger 
 than the fourth, but it is always less than the third or the 
 first. It would appear from this that the 4-group is com- 
 pounded of two 2-groups, or it may perhaps arise, as Haupt- 
 mann says in his u Natur der Harmonik und Rythmik," from 
 a combination of two 3-groups. However this may be, the 
 4-group does appear as a harmonious and organic unity in 
 itself. Given, then, a series of impressions which is made 
 up of three or four intensities recurring as a sequence of 
 fours, the mind divides the series into rhythmical groups, 
 whatever may be the arrangement of the intensities in the 
 sequence of four, so that the impressions are subordinated to 
 one another as nearly as possible from the beginning to the 
 end. The effort is always made to subordinate the last im- 
 pressions to the first. The same holds good for series which 
 are made up of sequences of two or three. In a sequence of 
 twos, only two impressions can recur ; the stronger is always 
 first in the group. In a sequence of threes, the groups may 
 contain two or three different intensities, but the mind always 
 divides the series in such a way that either the strongest 
 comes first or the weakest last. 
 
 When the series is composed of impressions differentia dura- 
 tion (the longer impression twice the length of the shorter), 
 recurring in a sequence of twos, the mind groups the series by 
 two, placing the longer impression last, and at the same 
 time gives to it frequently a greater intensity. When the 
 series is composed of a sequence of threes, one long and two 
 short, the mind groups the series by three, placing the longer 
 sound last, and at the same time giving to it also frequently 
 a greater intensity. The order of subordination is here 
 reversed. The more important element in the group comes 
 last. For this fact we can offer no explanation upon purely 
 psychological grounds. The fact, however, is interesting for 
 its connection with poetry. Although, as we have seen, 
 
$0 BOLTON : 
 
 English poetry in its early history contained feet accented 
 upon the first syllable, the most common foot in modern 
 poetry is accented upon the last syllable. What formerly 
 was the beginning of the foot is now the end. In the experi- 
 mental study with long and short sounds — these correspond 
 to syllables — all the subjects found great difficulty in not mak- 
 ing a pause after the long sound, which compelled them to 
 begin the group with the short sound. It was impossible to 
 avoid this pause or to make another after the short sound 
 equal to it, although the interval in every case was the same. 
 Upon this basis and other facts mentioned above, we are able 
 to base our answer to the question whether there is a foot- 
 division in English poetry. Although the long and short 
 syllables do not stand in the absolute relation of two to one, 
 yet the syllables do differ in length and in intensity of accent, 
 and for that reason they tend to fall together in groups. The 
 accented syllables, like the accented sound, will seem to be 
 longer than the unaccented, and in uttering them the speaker 
 will prolong them still farther. Series of syllables, then, 
 which are arranged with reference to the regular recurrence 
 of the accented syllables will fall into groups, and since the 
 accented syllables are longer than the unaccented, a pause 
 will be felt after the long syllable. To use the Latin termi- 
 nology, the most natural foot must be either iambic or 
 anapaestic. This, however, seems to be due largely to 
 modern ways of utterance. In order for a word to be intelli- 
 gible, it must be distinctly and carefully enunciated. In the 
 early history of poetry, it was always recited in highly 
 emotional states ; words were not articulated, they were 
 houted. The line of poetry was little more than a series 
 of strong and weak sounds, which, we can argue upon 
 the basis of our experiments, would be grouped with the 
 strongest first and the weakest last. In the change from the 
 merely emotional shout to articulated utterance, the character 
 of the foot changed from one which was accented upon the 
 first to one which was accented upon the last. 
 
 We come now to the subject of muscular movements and 
 their relation to rhythms. Most subjects felt themselves 
 impelled by an irresistible force to make muscular move- 
 ments of some sort accompanying the rhythms. If they 
 attempted to restrain these movements in one muscle, they 
 were very likely to appear somewhere else. Wundt 1 says 
 that the intensive clang change has its nearest pattern in the 
 sensation of motion. A corresponding rhythmical series of 
 motions associates itself in dancing, marching and beating 
 
 1 Physiologisclie Psychologie, Vol. II. p. 73. 
 
EHYTHM. 91 
 
 time, with almost irresistible force to the changes of strength 
 in the clang. 
 
 The most common forms of muscular movement were beat- 
 ing time with the foot, nodding the head, or swaying the body. 
 Subjects 3, 10 and 17 accompanied the rhythmical grouping 
 by muscular contraction of the diaphragm and chest, and it 
 was exceedingly difficult to restrain them. Other subjects 
 counted inaudibly or made the proper muscular adjustments 
 for counting. Slight or nascent muscular contractions were 
 felt in the root of the tongue or larynx. Most subjects were 
 unconscious of their muscular movements until their attention 
 was called to them, and subject 15 never became conscious of 
 the rhythmical contractions in the eyelids. When he was 
 asked to restrain all muscular movements, he found great 
 difficulty in maintaining the rhythmical grouping. This fact 
 was remarked upon by other subjects also. The reader is 
 referred to the records of subjects 2, 3, 7, 9, 10, 11, 12, 13 
 and 15. 
 
 Of the same nature as muscular movements, are the asso- 
 ciations of various objects. Most subjects visualized the 
 pendulum and clocks, large and small. Several referred to 
 the conical pendulum, striking three or four times in a swing, 
 and others to revolving wheels. Subject 14 visualized a 
 series of dots, and subject 11 at one time an undulating line, 
 and at another an ellipse with four dots placed upon either 
 side. Subject 15 made a color association. 
 
 The question we have to decide upon is, are these muscular 
 movements and associations the result or the conditions of 
 the rhythmical grouping % With Bibot we accept without 
 hesitation the latter. s* 
 
 Eibot states this principle, "Every intellectual state is 
 accompanied by physical manifestations. 1 Thought is not — 
 as many, from tradition, still admit — an event taking place 
 in a purely supersensual, ethereal, inaccessible world. We 
 shall repeat with Setchenoff, ' No thought without expression,' 
 that is, thought is a word or an act in a nascent state, that is 
 to say, a commencement of muscular activity." Each im- 
 pression as it enters into consciousness tends to find expres- 
 sion in a muscular movement, but the intensive changes in 
 the series of impressions produce corresponding changes in 
 the intensity of the sensations, which must find expression in 
 different degrees of muscular activity. In order to express 
 these different degrees of sensation, the muscular movements 
 must rise above the merely nascent state in which they 
 ordinarily occur, and manifest themselves in visible muscular 
 
 x The Psychology of Attention. 
 
92 BOLTON : 
 
 movements. The tendency for sensation to find expression 
 in visible muscular movements is stronger with children and 
 primitive peoples than it is with highly civilized and 
 especially well- trained persons. With the latter class, mus- 
 cular movements accompanying attention do not so easily 
 rise above the nascent state. 
 
 Exact coordinations of sounds with respect to intensity are 
 difficult, for the reason that great degrees of difference must be 
 allowed, that two sounds may be discriminated. This is proved 
 by the fact that higher groupings of 4-groups are difficult, for the 
 reason that the differences in the accents cannot be kept clear. 
 Groups of six and eight are difficult because the different 
 degrees of intensity required cannot be discriminated. Pitch 
 changes are much more easily discriminated, and more exact 
 coordinations are possible. They find their expression in 
 different degrees of tension in the muscles of the larynx. 
 With fast rates the intensive changes recur more rapidly, 
 and hence call for more rapid muscular movements. On this 
 account the faster rates were found exhilarating and animating, 
 and the slower rates drowsy and soporific. 
 
 For the same reason, subject 12 found that a change from 
 a 3-group to a 4-group gave rise to a feeling of a slower pace. 
 Within certain limits the mind can easily accommodate itself 
 to changes of rate. A rate which seemed unpleasantly slow 
 or fast at first, became in time pleasant. If the rate is slow, 
 the grouping which is first suggested is accompanied by a 
 feeling of suspense — subject 11 said the group broke off with 
 a " dead end" — but if it is fast there is a straining after a 
 longer group, or perhaps a hurried, animating feeling which 
 becomes monotonous. If a subject maintained a 2-group, for 
 instance, with a rate which was naturally too fast for group- 
 ing by two, it became exceedingly monotonous in a short time. 
 
 If the length of the group corresponds to the normal wave 
 of attention, the grouping gives rise to a feeling of satisfaction 
 and repose. There is probably not an absolute psychic con- 
 stant in attention which admits of no variations without feel- 
 ings of dissatisfaction, but within limits a constant is easily 
 established, which, if changed gradually, accommodates itself 
 to a longer or a shorter interval. A sudden change, however, 
 cannot take place without difficulty. For this reason, if the 
 grouping enforced by an irregular recurrence of an accented 
 sound change rapidly from one form of grouping to another, 
 it gives rise to an alternation of feelings of suspense and 
 straining which no one fails to perceive. The same phenom- 
 enon would arise if the temporal sequence of the impressions 
 were irregular. Either it would be necessary to group now 
 by three and now by four, or by two, that the interval between 
 
RHYTHM. 93 
 
 the successive accents should be the same, or there would be 
 an alternation of feelings of suspense and of straining to 
 maintain a grouping by three or any other number. "When the 
 rate was changing rapidly, as it did just after the chronoscope 
 was started (it required ordinarily about two minutes for the 
 chronoscope to attain its full speed), subject 4, especially, 
 and others remarked upon the diagreeable effect. The 
 accommodation to any form of grouping within certain limits is 
 easy, providing there is a perfect regularity in the sequence. 
 The accents must recur at regular intervals, and the number 
 of intermediate impressions remain the same, or there is no 
 feeling of rhythm. When a slow rate was succeeded by a 
 faster one, it gave rise generally to a disagreeable effect ; but 
 in time the subject could accommodate himself to it. Subjects 
 4, 9 and 15 make observations upon this point. Subjects 2 
 and 5 were greatly puzzled over a 5-group which was accented 
 on the first and third sounds. They attempted to group by 
 two and by three alternately, which gave rise to a very disa- 
 greeable feeling:. When, however, they grasped the regular 
 sequence of five, the disagreeable feeling passed away. 
 
 When a longer interval was introduced into the series, the 
 impressions coming between the long intervals fell together 
 into a group, but they did not form an organic unity. There 
 was no pleasure in such a rhythm. Something seemed to be 
 looked for in this longer interval which was wanting. When 
 the rate was made very fast, the impressions between the 
 long interval seemed to fuse together into a single impression 
 and then to group by two or four. 
 
 This general principle may be stated : The conception of 
 a rhythm demands a perfectly regular sequence of im- 
 pressions within the limits of about 1.0 sec. and 0.1 sec. 
 A member of the sequence may contain one or more simple 
 impressions. If there are a number of impressions , they 
 may stand in any order of arrangement, or even in a state 
 of confusion, but each member of the sequence must be 
 exactly the same in the arrangement of its elements. 
 
 The application of this principle to poetry demands that 
 the accents in a line shall recur at regular intervals ; it 
 requires also that the successive feet in a line shall be of pre- 
 cisely the same character. The introduction of a 3- syllable 
 foot into an iambic verse is allowable on this condition only, 
 that the 3-syllable foot can be read in the same time of the 
 two, so that there shall be no disturbance in the temporal 
 sequence of the accents. This foot affects the rhythm in so 
 far only as it changes the character of one member of the 
 sequence. This is an actual disturbance to the rhythm, but 
 it is allowable for the purpose of emphasis. The frequent 
 
94 BOLTON : 
 
 use of such a foot would be fatal. Poe's principle that the 
 regular foot must continue long enough in the line, and be 
 sufficiently prominent in the verse to thoroughly establish 
 itself, is perfectly valid. In a musical rhythm, however, the 
 measures may vary with certain restrictions in the arrange- 
 ments of their elements. But it is just this variation which 
 constitutes the melody to a certain extent. The rhythm is 
 varied for purposes of melody, but it is, nevertheless, a dis- 
 turbance to the rhythmical flow in so far that it changes the 
 measure. The melody is a new and higher unifying agency, 
 which corresponds in a way to the use of rhymes in poetry. 
 The temporal sequence of the accents is always preserved. 
 
 It remains now to make my acknowledgment to those who 
 have assisted in the work. 
 
 To President G. Stanley Hall I am indebted not only for 
 the subject itself, but for a large amount of material which 
 he had already collected upon it ; also for suggestions as 
 regards the direction of the experiment and references to 
 literature. 
 
 To Dr. E. C. Sanford, the director of the laboratory, is due 
 much of the credit for the success of the work. But for his 
 skill in devising and constructing apparatus, the work could 
 not have been carried on. His suggestions as regards 
 methods for making the experiment were no less valuable 
 than his assistance in devising apparatus. To all others who 
 so generously gave up their time to sit through long and 
 tedious experiments, I acknowledge my indebtedness. Space 
 forbids me making special reference to each one. 
 
 Clark University, 
 
 Worcester, Mass. 
 August, 1893. 
 
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