COLUMBIA LIBRARIES OFFSITE HEALTH SCIENCES STANDARD HX64099709 )P45 .P53 Physiological cruelt RECAP ^' ^S <^ ^v. -^ ^' ^ ;^. ap^-iT Pv5"3 y<<^^^^^^3» PHYSIOLOGICAL CEUELTY. Digitized by the Internet Archive in 2010 with funding from Open Knowledge Commons (for the Medical Heritage Library project) http://www.archive.org/details/physiologicalcruOOphil PHYSIOLOGICAL CRUELTY: OR, FACT V. FANCY. AN INQUIRY INTO THE VIVISECTION QUESTION. BY PHILANTHEOPOS. I ^J'^^^ i L? ^ •■ ■.^>'VV.„S?t-va.*? (<^:/^. LONDON : TINSLEY BROS., 8, CATHERINE STREET, STRAND. 1883. 'Y S3 PREFACE. In compiling this little book, my aim has been to place in the hands both of professional and unpro- fessional readers a short compendium of the principal established facts and most obvious reasonings on the question of Experiment upon Living Animals. I venture to hope that such a work may prove useful to medical men who have not time to consult books of reference, and examine into the details of the subject for themselves, without its being too technical to interest those of the general public who are willing to give thought and attention to a most important matter. I must risk the accusation of being either too professional, or too popular, only pleading that I have, at any rate, endeavoured to avoid inaccuracy. London, April, 1883. TABLE OF CONTENTS. CHAPTER I.— Introductory. PAGE Duty of unprejudiced Investigation — Object of this Book . . 1 CHAPTER II.— What is Pain ? Our knowledge of Pain derived from human experience alone — The process of Sensation and Pain — Reflex action independent of consciousness — Vagueness of " signs of Pain" — Definition of Pain— Feeling and Irritability — Feeling dependent on conscious- ness — Its relation to mental development — Animals less sensitive than Men — Mental element of Pain — Absence of this in animals — Examples — Amount of Pain in operations — Painlessness of Convalescence — Insensitiveness of brain substance — Example . 4 CHAPTER III.— What is Cruelty ? ■Cruelty defined — What is sufiicient justification for giving Pain 'i — Not merely the good of the sufferer -Nor his consent — But the attainment of an adequate benefit — Benefits aimed at in Physiological Experiment — These surpass the evil of Pain in quality — And exceed it in quantity — Consequently the benefit aimed at is adequate — Answer to objection . . . .20 CHAPTER lY.— Our Rights Over Animals. ^Experiments on animals asserted to be abstractly wrong — Reasons usually given — Experiment not necessarily demoralizing to the operator — Universality and beneficence of the Law of Vicarious Sufi'ering — Our right to apply it to animals for our benefit — Vagueness of the principle generally acted on — The true prin- ciple — Mr. Hutton's principle — Impossibility of carrying it out — Summary . . . . . . . . ... 31 CHAPTER v.— What is Vivisection? WTiat is Vivisection ? — Various definitions — Dissecting alive — True sense of the word — Course of study in physiological labo- ratories — Histological department — Chemical department — Phy- sical department — Experiments upon detached tissue and organs — Experiments upon j)ithed animals — Painful experiments — In- oculations — Testing of drugs — Use of aneesthetics — Statistics of experiments performed — Conclusion ...... 40 CHAPTER VI. — The Relation of Experiment to Physiology. Many non-physiological systems — Only one physiological system — The Empirical system — The Physiological system founded on Experiment — Experiment on living animals part of a rational method of investigation — The Circulation of the Blood — Blood pressure — Contractile power of the arteries — The Absorbent h VI CONTENTS. PAGE Vessels — Discoveries of Aselli and Pecquet — Yalue of this knowledge — Respiration — Changes effected in the inspired air — Changes eflPected in the blood — Digestion — The Nervous System — Discoveries of Bell, Magendie, and others — Present state of our knowledge on the subject — Muscular action — Discoveries of Haller — Summary ...... 51 CHAPTER VII. — The Relation of Medicine to Expeeiment. The subject a complicated one — An amputation in old times — An amputation at the present day — Facial nerves — Artificial respira- tion — • Transfusion of blood — Orthopedic surgery — Internal operations — Chassaignac's ecraseur — Removal of one kidney — Removal of larynx — "Animal grafting" — Study of the pro- cesses of disease — Testing of drugs — Preventive medicine — Other benefits of experiment ....... 68 CHAPTER VIII. — Legislation : Past, Present, and Possible. General state of the law — Martin's Act — No English physiologist prosecuted under it — The "Hand-book to the Physiological La- boratory" — The Norwich experiment — Appointment of the Royal Commission — Its conclusions from the evidence — Recom- mendations — The Act of 1876 — Its principal provisions — De- fects — Autocracy of the Home Secretary — Mode of proceeding under the Act — Action of the Home Secretary — Bill for the Total Abolition of Vivisection — Desirable modifications in the working of the Act — Responsibility to be left to the signa- tories — Certificates unnecessary for inoculations — Licenses held by medical instructors to hold good for their term of office — What is abstractly desirable ....... 83 CHAPTER IX.— Conclusion. Summary of previous argument — Supposed demoralization of ex- perimenters — Where the real danger lies — Conclusion . . 103 APPENDIX. APPENDIX A. — PoPULAE, Fallacies about Experiment . . 112 APPENDIX B. — Amount of Suffering Inflicted . . . 119 APPENDIX C. — Necessity of Experimental Research, for THE Welfare of Man and of the Lower Animals. Section I. Utility to Man. — Section IT. Utility to Animals . . 129' APPENDIX D. — The Fundamental Discoveries due to Experi- ment UPON Living Animals. Harvey and the circulation of the Blood — Discovery of the Lacteals 135 APPENDIX E.— The Medical Minority. Evidence given before the Royal Commission — Subsequent Literature .......... 142 APPENDIX F.— Legislation. Object of Legislation i-ecommended by Royal Commission — Scojie of Legislation recommended by Royal Commission — Manner in which the Act is administered ...... 152' PHYSIOLOGICAL CRUELTY. CHAPTER I. INTRODUCTORY. Duty of unprejudiced Investigation. — Object of this Book. When a question lias been made the subject of hot debate, and been tossed up and down in discussions where feeling has played as large a part as argument, it becomes enveloped in a dust-cloud of words, sweeping charges, and irrelevant recriminations, in which it is difficult to keep sight of the central object. The first duty, then, of any one who wishes to see the truth for himself, and to show it to others, is to get rid, as far as may be, of all this turmoil, — at least, to keep the door of his own mind close shut against it, — to silence any strong prepossessions for one side or the other, and strive quietly to see the thing which is, not that which he hopes, or fears, or thinks may be. This is never an easy thing to do ; and in the " Vivi- section " controversy it is peculiarly difficult, for it involves the sacrifice on both sides of the strongest feeling involved. A physiologist must lay aside his abstract devotion to Science ; he can no longer use the advancement of her interests as the ready test of his work, and the sanction of her greatest servants as his justification ; but he must be B 2 PHYSIOLOGICAL CRUELTY. content to inquire whether the practice of performing ex- periments on living animals is or is not reconcileable with true humanity, and what is its eftect upon the moral sense of those who use or approve it. On the other hand, a lay man or woman must not be swayed by the natural love of animals, and dislike to the infliction of pain, which make it grievous to think that any feeling creature has been hurt deliberately ; still less must they excite their feelings by the attempt to realize the necessarily repugnant details of the operations, and to imagine their own pet dogs subjected to them. What they have to ascertain is — what is really done of this sort, whether Avhat is done is necessary, wdiether it is justifiable, and how it is regarded by those who practise it. The question of whether it is pleasant or painful to think of has absolutely no more to do with the matter than it has with surgical operations, which few of the general public would care to witness, or to hear de- scribed in detail. I do not write for readers who take a pleasure in ghastly descriptions and ugly minutiae, which are totally unnecessary for the discussion of principles. Such a pleasure is morbid, and I desire to address only the sane. That class of mind which, in a lower stratum of society, revels in the Police Heius and tlie "penny dreadfuls," will never be at a loss to provide itself with repulsive literature, and I shall not cater for it. In the text of this little book, therefore, there will be found only such medical details as are indispensable to the argument, further in- formation on special points being added in the Appendix. I desire now to make an attempt to look fairly at all the points of this large subject, and to carry my readers step by step along the inquiry which has brought my own mind to certain definite conclusions. We shall insist, as we go along, upon knowing exactly what we mean and are dis- cussing, and having a clear idea for every word used. We INTRODUCTORY. -J shall endeavour to trace the moral })rinci2ile.s which bear upon the matter, and to learn liow to ap])]y tliem. We shall examine into the actual relations of Pliysiology and Medicine to Experiment in the past, and thence deduce their probable relation in the future. We shall see what is and has been the state of affairs in England as to experi- ment upon living animals in our own day, both before and after the passing of the " Cruelty to Animals Act," of 1876, — what has been done in the laboratories, Avhat is permitted by the law. Thence we shall be able to conclude whether any changes are desirable in the nature or administration of the law ; and if so, w^hat they should be. There has been enough, and too much, of personal con- troversy over the " Vivisection " question, and I would rather avoid adding to it. As far as possible, it seems best to consider the absolute facts and reasons which bear on the subject, and draw our own conclusions, without stopping l^y the way to argue with every one who has arrived at a different result ; but in reaching any conclusions at all, one is obliged to differ from thinkers either of such eminence or of such influence that to take no notice of their arguments would seem arrogant or cowardly. It will, therefore, be necessary to discuss some of the most notable statements and arguments which have appeared in print. As far as possible, I shall give references and authorities for every assertion of fact which can be disputed by any one with a reasonable knowledge of the subject ; and I ask from my readers only that candid attention, and that open- ness of mind, which are the absolute conditions of finding truth in any direction whatever. The point chiefly in dispute is the rightfulness of giving pain to animals for certain purposes ; consequently, the question which meets us at the outset of our enquiry is — What is pain ? l2 PHYSIOLOGICAL CRUELTY. CHAPTER II. WHAT IS PAIN? Our knowledge of Pain derived from human experience alone — The process of Sensation and Pain — Reflex action independent of Con- sciousness — Vagueness of "signs of Pain" — Definition of Pain — Feeling and Irritability — Feeling dependent on consciousness — Its relation to mental development — Animals less sensitive than men — Mental element of Pain — Absence of this in animals — Examples — Amount of Pain in operations — Painlessness of con- valescence — Insensitiveness of brain substance — Example. All that we know about Pain is derived from human experience. This seems veiy obvious, but not the less it is often forgotten. As a matter of fact, we Jcnovi nothing about any pain except what we have ourselves suffered. We cannot feel with another person's nerves ; and when he describes his feelings, we cannot be sure that the words he uses bear the same meaning to him as they do to us : but we take for granted a general analogy between him and ourselves, based on our common nature ; and from time to time we correct this assumption, as we discover minor differences between us, and conclude perhaps that lie feels pain more or less acutely than we do. As men have been acting on this assumption for centuries, and constantly comparing experiences, there has grown up an average standard of human sensibility, by which we guide ourselves, and which allows us to say in a rough way that ^uch and such a person is insensitive or hypersensitive. WHAT IS PAIN ? 5 But when wc have to do with animals, we lose ourselves at <-)nce. The community of nature from which we argued wdth men, has sunk from an identity of species to a similarity of type ; the comparison of experiences by which we corrected our conclusions, is impossible. We have nothing left to guide us except an analogy with ourselves wdiich we know must be misleading, and " signs of pain," which are of all indications the vaguest. They are thus vague, because all that they prove is that something is going on which the organism repels ; but they do not prove that there is any consciousness of it, and if there is consciousness they do not show the degree of feeling. This will be clearer if we glance at wdiat actually happens when an injury of any kind is inflicted. Every one knows that there are two great classes of nerves, — the afferent, which convey messages (or, more properly, impulses) to the brain and spinal cord, — and the afferent, which bring aw^ay impulses from it. The afferent nerves alone can convey those impulses which give rise to feeling ; the efferent nerves are quite incapable of doing so, and their chief business is to convey those impulses which excite motion. The afferent nerves mainly begin in small organs called touch-corpuscles, great numbers of which are .situated in the skin, making it much more sensitive than the deeper tissues. If you drop some hot sealing-w^ax on a person's hand, all the little terminals of the spot on wdiich it falls are suddenly stimulated, and there is an instant change in the activity of their molecules. Then a change runs along the nerve-fibre to which they belong, until it reaches the spinal cord, wdiere it enters a ganglion, or knot of nerve-cells, full of independent energy. A portion of the impulse will be communicated to the fibres wdiich go up to the brain ; wdiile some of the energy latent in the gan- glion will be released by the arriving shock, run down an 6 PHYSIOLOGICAL CRUELTY. eiferent nerve, and set in motion the muscles of the hand and arm, — and the hand will be pulled a^vay. This process sounds long in describing, but we feel it to be done instantaneously. It can be carried out by the nerves and the ganglion, quite independently of that part of the impulse which went on to the brain, — and what becomes of that need not necessarily affect the action. Its fate will depend upon the condition in which it finds the brain. That organ may be awake and ready to attend to it, and in that case there will be a keen feeling of pain ; it may be absorbed in its own work, carrj^ing on thought, and give it only a half attention, — and then (especially if the stimulus has not been of quite so strong a kind as the one supposed) there will be a faint impression made on the mind, and soon forgotten ; or it may be stupefied by nar- cotics, and take no notice at all, and in that case there will, of course, be no feeling of pain whatever. But whether pain be keenly felt, or faintl}', or not at all, — the jerk away of the hand, which is the outward sign of pain, will be present all the same, unless the narcotizing has been so performed as to affect the nerve-centres in the spinal marrow which govern reflex actions, as well as the brain. So long as only the higher centres are laid asleep, reflex actions will go on, even more markedly and with greater energy than when it is awake. People operated upon under chloroform will shrink and scream, because the stimulus from the irritated nerves has gone round to the nervous centres which set the vocal organs in motion ; but their intellectual and higher sensory centres are asleej^, and the}' feel nothing. It will not do to say that they did feel the pain at the time, but have forgotten it ; for, firstly, they will sometimes remember having heard themselves scream : and, if so, whv should theY not remember the much WHAT IS PAIN ? 7 .stronger impression of pain ? and, secondly, when lliey are only partiallj- narcotized, they feel some pain, and remendjer that they have done so, — whence it is only reasonable to conclude that when they remember no pain it is because they have felt none. Therefore, even cries do not prove that pain is really felt, because they do not prove that the brain is in a condition to feel it. It is the same with motions, jerks, or struggles. We have seen that the process which makes us jerk away our hand, for instance, from any painful touch, can go on quite independently of conscious- ness. It may go on where Ave liioiu that there is no con- sciousness. If a person's neck or back is broken (I.e., if the spinal marrow is so severed or injured that impulses can no longer pass the place of the injury), there will be no consciousness of what goes on below it. Such a person's foot might be cut off, and he would never feel it. Prick the leg, he will tell you that he has no sensation of pain, yet the leg will be pulled away from the prick ; tickle the sole of his foot, and the foot will be jerked away. What is more, such reflex actions will be much more violent than they would have been if he had been conscious, probably because all the energy of the impulse is expended upon producing motion, and none of it upon producing sensation. It is often difficult to keep such patients covered up in bed, because the sliq-htest ticklino- or irritation from the bed- clothes will make them kick them off". A horse can kick after he is dead. A' knacker, after he has cut oft" a horse's head, will pass a long rod down the spinal marrow to destroy its activity; otherwise, as soon as he began to skin the body, the legs would kick with sufficient force to break his arm.*' Such a motion in response to a stimulation is called "^ Evidence of Dr. Anthony before the Koyal Commission on Vivi- section, Q. 2484. 8 THYSIOLOGICAL CRUELTY. in scientific language a reaction; in agitationist language it is called a " spasm of agony."* It is best marked where there is no agony at all, which is, perhaps, a reason for preferring the former phrase. Motions, cries, jerks, and struggles cannot, therefore, be depended upon as indi- cations of pain. But it may be asked ; If so, why do phj^siologists per- forming experiments under anassthetics tell us that they give a fresh dose whenever they see the animal move ? Clearly, in order to be a long way on the safe side. When the reflex functions of the spinal cord are laid at rest, the consequent ansesthesia is deeper than when only the higher brain centres are aflfected ; and we have the test of motion for the one, and have no test for the other. It is known that an animal ')nay he unconscious while it struggles vehe- mently ; but there is no doubt that it is unconscious, when it does not struggle at all ; and to save it pain and keep it quiet for the time are the objects of the oj)erator ; he need not also think constantly of the danger of its succumbing to the ansesthetic, as he would with a human subject, — con- sequently, he gives it much more freely. It would of course be absurd to say that there are no such things as signs of pain ; all that can be said is that such indications are exceedingly vague, and cannot be interpreted rightly without a knowledge of the condition of the brain. When we see a creature struggling and kicking, or hear it cry, we cannot tell from that alone whether it is feeling pain, or whether it is feeling much or little. In order to know if it feels any pain, we must know whether its consciousness is at work, or whether the im- pulse is circling round its nerves and muscles, Avithout * " The very fact that physiologists select delicate petted dogs to exhibit reactions (cfnglice, spasms of agony) under their operations . ." Miss Cobbe, in ForttdgMly Review, January, 1882. "WHAT IS TAIN ? 9 jiroiising the Ijraiii at all ; and in order to know if it feels much pain, we must know what sort of cognizance its brain is capable of taking of such messages, when they do arouse it. In other words : In order to judge of the pain suffered hy any creature (human or other), we must be acquainted Avith both the ordinary quality and the present condition <:»f its brain. Pain (like many other words upon which much depends) is used with a good deal of ambiguity. It is often far from clear — even to the speaker — whether he means by it the t^ffect produced upon the nerves or upon the organism, whether he is thinking of what the nerves feel or of what the creature feels. Yet there is a deep distinction. One often hears it said that a person has undergone a very painful operation, but that he did not feel it, because he was under chloroform. As soon as we look at this critically, we are inclined to ask : If he could not feel, he could have no pain ; and if he had no pain, how was the operation painful ? And the criticism seems valid. There is evidently a confusion between two meanings of the same word, and confused speaking leads to confused thinking. Let us therefore avoid both, by clearly defining the sense in which we use our terms. A moderate stimulation of a nerve produces an agreeable or a useful effect. Nerves were meant to work, and for <_'ach there is a degree of activity which is normal and pleasant. Beyond this point stimulation becomes dis- tressing and injurious, and, with sensory nerves, passes into pain. Pain may therefore be described as the result of the excessive stlmidation of a nerve. Of course, if the brain is narcotized, it is not affected by this excessive stimulation (though it takes place just the same) ; and therefore it is not nonsense to talk of a painful operation being performed without pain. But when the brain is awake, and working 10 PHYSIOLOGICAL CRUELTY. healthily, it takes note of the excessive stimulation ; we become conscious of it, and the result is Feeling. The nerve, however, is not narcotized, and then the impulse runs along it, and is reflected by the ganglion cells into the corre- sj)onding efferent nerve, which responds accordingly. This capability on the part of a nerve of being affected b}' stimuli — is called Irritability ; it lies quite apart from con- sciousness, and is entirely different from Feeling. A muscle cut out of a freshly-killed animal has Irritability, because it will contract under a current of electricity ; so has the heart taken from a decapitated frog, because it continues to beat, and its action can be hastened or retarded by heat, cold, or drugs ; but they have no brain, and so can have no consciousness and no Feeling. So, when the cerebral hemi- spheres are removed from a frog, all its nerves possess their old Irritability, and the reflex actions go on as well as if it were a complete creature. Touch it, and it will jump ; put a drop of acid on one leg, and it will rub it off' with the other ; put food into its mouth, and it will swallow ; but all this time it has no Feeling, for it has no organ of con- sciousness, and acts like a machine, which merely moves Avhen you work the springs. If, instead of removing the cerebral hemispheres, we suspend their action by narcotics, the effect for the time being is as if they were not there, and there may be the highest Irritability of the nerves, but still no Feeling in the creature. There may be all the signs of pain, Avhich result from the general sensitiveness of the nervous system ; but these prove that it is sensitive, and nothing more ; they prove nothing about Feeling, of which we know them to be cjuite independent. And observe, when it is said that a pithed frog {i.e., one whose spinal marrow has been cut through, near its junction with the brain), a pigeon without cerebral hemispheres, or a chloro- WHAT IS PATN ? 11 formed cat, cannot feel, the statement is not a conjecture. We are on firm ground, because we are going upon human experience, assisted Ly trustworthy analogy. We liaye the eyidence of men and women who can be questioned, and can tell us what they haye felt, and not felt. We know that we cannot feel without our Ijrains ; and we find that whereyer we can test the functions of the brains of other animals, they are like ours in kind, though differing in degree. We see also that the general type of the neryous system is the same in all vertebrate animals ; and that its increasing specialisation, as we ascend in the scale, is all in the direction of resemblance to our own. We haye, there- fore, eyery reason to belieye that the brain is always the organ of consciousness, and that when it is abssnt, or in- active, there can be no consciousness, and consequently no feeling. As the existence of feeling depends upon the activity of the brain, there is a fair presumption beforehand that it also increases with the more perfect development of that organ ; and we should naturally expect to find that animals can both enjoy and suffer more, as they stand higher upon the ladder of being, and that man — the highest of animals — is also chief in sensibility. We can never get inside the consciousness of a creature with which we cannot commun- icate ; but in the human race we find a certain rough pro- portion between sensibility and intellectual development, which leads us to believe in a similar proportion existing in the ranks below us. Savages will undergo with equan- imity tortures which no civilized man (except perhaps under great excitement) could endure ; and it is impossible to believe that the prolonged pain of tattooing could be borne for the sake of ornament l>y any one who felt it as T\ e should do. The arguments used for the special protection 12 PHYSIOLOGICAL CRUELTY. of cats and clogs against experiment are founded on this greater sensitiveness in the more highly organized creature. There are two factors in nervous and intellectual activity. One is the structural factor, i.e. the actual amount of nervous matter to be set in action, the quantities of blood supplied to it, and the arrangements by which the blood bathes numerous surfaces of the brain ; the other is the functional factor, i.e. the amount of nerve force in action, or the energy both actual and potential evolved by and stored up in the nervous cells. Neither the size of the skull, nor even the weight of the brain, is a clear index to a man's intellectual faculties, because the more ethereal component always escapes from our weights and measures. But it is clear that sensibility must vary as this supply of nervous force varies, because the same properties which cause us to think a thought enable us also to feel a sensation. If the nervous system is not easily excitable, a painful stimulus will travel through it slowly, and even while producing its appropriate reflex action, will have little power left to affect the brain, and will produce a feeble effect when it arrives there ; whereas, sensitive nerves will convey im- pressions rapidly to a sensitive brain, and the result is a quick and vivid sensation of pain. This all seems so obvious as to be hardly worth saying ; yet it is ignored by those who argue from our feelings to those of the lower creatures, as if they were the same, and assert that animals are as sensitive as man. Their re- actions may be as prompt as those of men, because a larger proportion of their nervous energy luorks through the spinal cord and inferior brain-centres, and less is expended on tho light. But the question is not — Does a prick of a needle make them start as quickly as a man would ? but — What impression does this needle-prick make on their con- sciousness ? And the answer must depend upon the ainount WHAT IS TAIX ? ] •> of nervous energy wliich goes to ^•ivify that consciousness. But the veiy fact that man's intellectual activity is so much greater sho^ys that a larger surplus vitalizes his hrain, and proves that the whole stock of nervous energy from which that surplus is taken must be larger than that of inferior creatures. Therefore, though an animal's nerves may dis- play as much irrltahillty as a man's, it is impossiLle that it can have as much feeling as he has, for the simple reason that it has not as much stuff to make them both out of. In fact, seeing that its mental power (which is the index of its supply of nervous force) is so much less than his, we should be more inclined to believe that its actual feeling came near his feeling, if the demonstration of it were less ; because (as was said before) we see that in human beings reflex actions are most marked when there is no intellectual action, -i.e., when they are asleep, narcotized, or have sustained injury of the spinal cord. Thus much about the raw material (so to speak) of pain, — the nerves which convey the impulse to the brain, and the brain which receives it. But there is a distinct element contributed to the feeling of pain by this organ itself, actively as well as passively. In all that adult human beino's suffer there is a mental factor which is almost absent in animals. It cannot be better described th-an in the words of Mr. Edmund Gurney. " The sense of rebellion, the helpless beating about of the intellect, the counting of time, and vivid sense that each moment will be like the last, the demand, ever urgent and ever baffled to find a meaning for such experience, — more than all, the sense of wrong that comes from comparison, the consciousness of self as an exception, of clueless isolation, of being marked off from normal sentient life by an intolerable something which none can share,— all this points to the close relation of suffering to intelligence ; and the consequent difference 14 PHYSIOLOGICAL CRUELTY. between man and brute would presumably be at its max- imum in eases of protracted suffering helow the agony-point where intellect is too blinded to be active."* Such intelligent creatures as dogs have, of course, memory, and are capable of recalling places and things which have been associated with suffering, and dislikino' them ; but with an average dog such memory is faint, as compared with what we should exert under the circum- stances. Dogs kept at physiological laboratories for the purpose of experiments (of course, not severe ones, as animals cannot ever be kept alive to undergo these again and again,) display no such horror of the operating room as was described in a sensational paragraph (without names or authentication) which was sent the round of the papers some time ago. A dog released from experiment lias been known to jump up upon the operating table and sit there to inspect with interest his companion having his turn, showing that no very painful impression could have been left on his mind by whatever disagreeables he had undergone. Dogs with gastric fistulaD {i.e., with an opening in the stomach, in which a silver tube is usually fixed,) enjoy life in perfect health, and will sit up or lie down when told, to have different substances injected or extracted. At Professor Lud wig's laboratory, in Leipzig, the dogs used as subjects for many such experiments are neither tied nor chloroformed, but merely patted and talked to while the process is going on. Amono- human creatures we see the effect of mental development upon the sense of pain very clearly in the case of children. An infant can be vaccinated without making it cry, if its mind is kept occupied by a bit of sugar * "A Chapter in the Ethics of Pain," Fortnighthj Preview, De- cember, 1881. WHAT IS TAIN 1 15 held before it ; and it will undergo even nuicli more pain without discouiposui'e, it' well amused. But wlien that child is three or four years older, he will understand that something is going to be done to him ; he will be terrified at the preparations ; neither sugar nor anything else will divert his mind ; and he will be conscious of all the pain given, and probably exaggerate it from terror. If pain can thus be a secondary thought in the minds of infants, it can be still more so in that of animals. A house-dog met Avith an accident, l:)y which a large piece of' the skin and flesh above the eyebrow was cut, and hung loose over the eye. His master, a surgeon (who furnishes the anecdote), determined to stitch it. Now, it is well known that — the skin being extremely sensitive — stitching is one of the most painful parts even of serious operations. The dog was taken into a shed, muzzled — for the safety of the operator — and the cut stitched up. All the time that it was beino- done, he Avas strainino" and struo-o-lino- to get away, though never whining nor crying. The instant he was released, he dashed into a corner of the shed, and seized a bone which he had had his eye upon, and which had possessed his soul Avhile he had been undergoing operation without anassthetics, and proceeded to enjoy it. A horse, whose leg was badly broken, was sentenced to be shot, but there was considerable delay before the execution could take place. The bones were completely broken through, so that the leg hung loose, a state of things during which the least motion causes a human patient most ex- quisite agony. No suffering is worse than that from a broken bone, and the only w- ay to prevent its becoming- intolerable is to avoid the slightest jar which can grate the fragments against each other or the surrounding flesh. But during the two hours between its injury and its death 16 PHYSIOLOGICAL CEUELTY. this horse grazed, and limped about to graze, carrying the fractured limb dangling !"*" Such cases as these leave it no longer to conjecture whether animals feel as keenly as we do. We knew beforehand that they were not likely to do so, on account of their lower mental calibre, implying an inferior supply of nervous energy, and also on account of the absence of the mental element in their sufferings ; we saw that their reactions (commonly called " signs of pain ") proved only irritability, and not feeling ; and here is absolute demon- stration of the truth of our inferences. It may be well to add a few words on the absolute pain- fulness of important operations, both upon the human sub- ject and upon animals, whether for purposes of cure or of experiment. The suffering is really much exaggerated. The cutting of the skin is very painful, because it is amph' provided with fine twigs of nerves, apd, above all, with the terminals of nerves. But the deeper tissues below are, for the most part, only sparsely penetrated by trunks of nerves, and are supplied with nerve terminals which have nothing- to do with sensation ; and unless a nerve trunk be cut (when there is a momentary flash of intense pain), there is little feeling. From the few operations that must still be clone without the use of anaesthetics, surgeons know that only the cutting of the skin causes the patients any great deo-ree of pain. Indeed, the deeper structures may be probed, incised, or pinched, without causing even uneasiness, except a nerve-fibre lie in the way of the instrument. In such a case, the patient being a man, we can hear what is. really felt, and know that the pain is moderate, even with * Both this and the preceding anecdote are vouched for by eye- witnesses, and will doubtless recall to most readers similar instances. of the indifference shown by even the most sensitive of our domestic animals to what we should call intense pain. WHAT IS PAIN ? 17 extensive laceration of the deeper soft parts. Such facts .show us that it is not safe to judge of what is terrible to suffer by what is terrible to witness. The pain of convalescence is often counted among the sufferings inflicted upon animals by experiment, and not obviated by chloroform. But in reality they scarcely suffer at all. It cannot be supposed that they are worse ofl' than human beings recovering from severe operations, and as long as no complications set in, such patients are easy and comfortable. Even a severe cutting operation which removes some source of irritation, is felt to give immediate relief; the mere healing of the cut surfaces actually causes no pain ; and if one questions the recent " operation cases " in the surgical ward of a hospital as to how they feel, the usual answer is " quite comfortable." Indeed, if it is not, the surgeon suspects that something has gone wrong, and the wound must be examined. The healthy flesh of animals heals more rapidly and even more painlessly than that of men, and their supposed suflerings during convales- cence are really a myth. The introduction of the aseptic^' treatment of wounds has certainly assisted to ensure this complete absence of pain after cutting operations. As inflammation is thus warded off, the heat, swelling, and painful throbbing, which are almost inseparable from its slightest form, are also prevented. Some time ago, a case was brought into a police-court, in which a surgeon was charged with having kept monkeys in torture for months, because he had per- formed a series of experiments upon their brains. Now, what were the facts ? During the whole of the actual operation, it was necessary to keep the animals in a state of profound anaesthesia ; the most exquisite care was needed * Treatment witli carbolic acid, in order to destroy the microscopic organisms which cause inflammation in wounds. C 18 PHYSIOLOGICAL CEUELTY. in its performance, that the result might be successful ; the wounds were treated antiseptically, to avoid inflammation, and as a result, it only took place in one case out of the twenty-six operated upon. How then were these animals " tortured " ? It seems to be supposed by many people who write on this subject, that injuries to the brain are in themselves painful ; and the ugly expressions "washing the brain away" and " reducing a dog's brain to the condition of a lately- hoed potato-field "* are quoted and re-quoted as if they implied the infliction of horrors. But as a matter of fact, injury to the brain itself causes no pain, and wounds of the skull often pass through their entire course without the patient having even a headache. The accurate scientific account of such an injury, occurring in a human being, Avhich appears in a recent German medical periodical, seems to put the question beyond doubt. A 3'outh, aged 18, re- ceived a blow of a hammer in the temple, which cut the scalp, fractured the skull, and ruptured the coA^ering of the brain. The result of this was that a considerable quantity of the brain-substance escaped on three several days. The wound was dressed aseptically, and healed shortly without any inflammation. Although many paralytic symptoms followed, the patient never lost consciousness, and remem- bered perfectly every circumstance connected with the injury, symptoms, and treatment, from first to last. From the time when the wound was first dressed, to its complete healing and the disappearance of all symptoms, he never coiniiiilained of any 2'Kiin, nor even had the least headache.'f Every practical surgeon is familiar Avith cases proA^ing equally AA'ell the Avant of sensibility in the substance of the brain. * Miss Cobbe, quoting from a German writer. t " Ein Fall Traumatischer Apliasie." Sitznngsbericlit der Wilrz- burg. Phys. Med. Gesellschaft, 1882. WHAT IS PAIN' ? v.) Sucli cases enable us to estimate the value of the indii;-- nation expended upon all these experhnents on the Ijraiii. The only pain given is that to the feelings of tender-hearted people ignorant of physiolog}' ; but that appears to ha\'e been so intense as to render it necessary to stop tlie expe- riments, arrest English inquiry into the functions of the brain, and limit the gaining of experience in the treatment of its injuries to what can be acquired b}' Nature's experi- ments upon human subjects. We have now seen that the Feeling of Pain is dependent upon Consciousness, and, in a certain degree, proportionate to Intellect ; consequently, an animal at any time suffers less than a man would do fi-om the same cause ; and under anaesthetics (like man) does not suffer at all. Injuries to the brain are painless to men, and must, therefore, be painless to animals. Prolonged and deep operations are not more painful to men than superficial ones (since the cutting of the skin is the acutely painful phase of any operation), and therefore they cannot be so to animals ; and we have moreover seen from facts, that what would cause us agony hardly disturbs their equanimity. Convalescence after operations is normally painless to both. All these facts must be borne in mind in further discussing the question of experiment on Living Animals. C '2 20 PHYSIOLOGICAL CRUELTY. CHAPTER III. WHAT IS CRUELTY ? Cruelty defined — What is sufficient j ustification for giving Pain ? — Not merely the good of the sufferer — Nor his consent — But the attainment of an adequate benefit — Benefits aimed at in Physio- logical Experiment — These surpass the evil of Pain in quality — And exceed it in quantity — Consequently the benefit aimed at is adequate — Answer to objection. We are "all agreed that cruelty is wrong. The question to be solved, therefore, is : — What is cruelty ? The simplest thorough definition seems to be : — The wanton or excessive infliction of pain. The tvanton infliction of pain is that for which there is no justification ; the excessive is that for which there is justification in fact, but not in degree. Both terms imply that there can be such justification. Let us try to ascertain what it is. The first consideration that suggests itself is — that it is justifiable to infiict pain upon another for its own good. We act upon this principle constantly, with clear consciences, and in the cases of those whom we love best. In the education of children, and the care of the sick, or in the treatment of criminals — who are socially children, and morally sick — we do not hesitate to refuse what is pleasant, and enforce what is painful. But this principle is not a WHAT IS CRUELTl' ? 21 sufficient guide. It is quite possible to do (-omjthing which is really cruel, for the good of the sufferer. Let us suppose a case. Two children — a boy and a girl — are dis- figured by teeth which have been allowed to grow crooked. The mischief has gone so far that it can only be remedied by long and painful treatment. There will be constant discomfort and distress for months, and tooth drawing and other very painful minor operations from time to time. The teeth are sound, and there is no danger of w^orse consequences than the ugly appearance. It is certainly for the children's good that this should be amended, and the father takes them to a dentist. But the boy is very nervous and sensitive ; he suffers agonies of terror at the mere rattle of the instruments in the drawer; he is reduced to fainting by his first experience of them, and loses his sleep from pain and general nervous misery. Would not any friend advise the father : — " Give it up ; it is cruelty to torment the child so for a matter of mere appearance ; when he is grown up he can w^ear a moustache and partly hide the defect; and, after all, looks are of little consequence to a man" ? Whereas, if the boy w^ere sturdy and robust, his father would do well to encourage him to bear the pain, or even insist on his doing so, for his future advantage. But with the girl he would be much more unwilling to give up the attempt, and his lady friends w^ould certainly urge him to persevere, reminding him that if her health suffered from pain and fright, she might be nursed up into strength afterwards ; but that there would never be another chance of saving her from disfigurement, and it would be a ssrious drawback to her through life. In this case, the pain is alwaj's inflicted for the good of the individual, whether girl or boy ; but our judgment of whether its infliction is cruel or not, varies according to the proportion between the pain 2-^ PHYSIOLOGICAL CRUELTY. tiiven. and tlic object aimed at. Hence we conclude that — Pain ^iven for the s'ood of the individual itself may Lc unjustifiable, if the good to he obtained is not suffLclent. Another qualification which naturally occurs to the mind is the consent of the sufferer. It may be urged that there can be no cruelty with the goodwill of the person chiefly concerned. But in the case which we have just been con- sidering, if the boy liad been very conscientious and obedient, as well as very nervous and sensitive, it would surely have increased the father's cruelty, if he had used the child's conscience to enforce unreasonably harsh com- mands. Let us suppose another case, this time of suffering with consent for the good of others. It is ?aid that the wife of an American doctor allowed herself to be inoculated with a decoction of mouldy straw, in order to see if the result would be an attack of measles, which proved to be the case. Measles (though extremely unpleasant) is not a very painful complaint ; and when we tliink of the risk that the lady ran, and of tlie discomfort to which she sub- mitted, in order to further her husband's investigations, we are only inclined to admire her devotion to him and to science. But suppose that his ascendancy over her mind had induced her to let him inoculate her with leprosy, in order to try the agonizing modes of cure in use among the natives of some of the South Sea Islands. Should we not feel that he had been guilty of cruelty, and that obtaining her consent was no palliation ? Suppose, besides, that he had no intention of practising on leprous cases, or of pub- lishing his results, but was merely gratifying a scientific curiosity ; would he not be deemed brutal beyond excuse ? On the other hand, suppose that he had nearly perfected a mode of healing, however painful, and needed but one test case to decide some critical point ; after which he intended WHAT IS CRrELTV ? 23 to devote his life to curing wliat hae positively injurious to society and to the man himself ; l)ut these are exceptional cases. As a rule, " a man is l)ctter than a sheep,"* or even than " a dog, cat, mule, ass, or horse."-f- The conclusion which cannot be escaped is — that if the keeping of one rabbit, dog, or other animal in pain could buy the health, long life, or activity of one man who would otherwise have suffered equal pain, died, or been rendered useless, a distinct advantage has been gained to the community and to the universe. We reach a stand-point in this minimum of benefit. Let any one who dislikes the conclusion answer distinctly : If the question is whether a man or a rabbit shall have a ceiiain amount of pain, is it better that it should be the man? And if it is not better that he should have the pain, is it better that he should have what is worse to him than the pain? * Matth. xii. 12. + Cruelty to Animals Act, 1870. AVHAT IS CRUELTY ? 27 It is now clear tluit the evil inflicted on animals in painful experiments is exceeded in quality by the good sought to be obtained for man. We have next to compare the two in quantity. We have hitherto been supposing that the pain suffered lasted as long as the benefit purchased. But this is never the case. The most prolonged painful experiment that could be imagined would only last during a few hours*, a far shorter time than many an agonizing disease ; but a restoration to health or a relief from pain for such a time would never be thought worth counting among the good results of experimental medicine. To cure a sick man is generally to give him a period of restored health and efficiency which may be counted by years ; at any rate, whatever is worth calling " a cure " at all lasts for much longer than the longest painful experiment. The pain passes, the relief remains ; the lower creature finds a speedy end to its sufferings in release or death ; the ma]i lives on in renewed health and power ; what is evil is transient, what is good is enduring. Even in the case, then, of one animal suffering for one man, we see that the good obtained exceeds the evil in quantity, because lasting longer. But, as a matter of fact, such a simple case of one versus one seldom occurs. The only instance of it is the rare one when a surgeon tries an experiment upon an animal, for the sake of perfecting himself in it, before performing it upon a man. This would seem a most righteous use of vivisection, and all the above arguments would apply to it in full force, even if the subject could not be anaesthetized. When a surgeon knows that the life or death of a fellow- creature, with all the innumerable ties of duty and affection * A series of experiments might of course last longer, but then they would have intervals ; and so also would an induced illness, but the animal is generally killed as soon as the disease is fully developed. 28 PHYSIOLOGICAL CRUELTY. which hang round all human lives that are not desolate, is shortly to depend upon his skill, surely it is his duty to fit himself for that solemn charge by every means in his power. Besides, such experiments for gaining operative experience could nearly always be performed under chloroform ; but although they might be quite painless, and their usefulness. is peculiarly direct and obvious, they are expressly forbidden by our English law. We need not, therefore, consider them further. The next simple case is that in which a definite number of animals is experimented upon for a definite object, and we know the result. For instance, we know that — in order to perfect the method of performing the operation known by his name — Mr. Spencer Wells operated upon 16 (?) anaesthetized rabbits and guinea-pigs. And we know also that with his ow^n hand he treated successfully 600 women, who would otherwise have had an exceedingly small chance of life, considering the danger of so terrible an operation, before his experiments. We know, moreover, that this. number is constantly increasing, as other surgeons of suffi- cient skill rise up and avail themselves of his method, while no more rabbits need be killed. It is not often, however, that we can so distinctly put in two columns the lives sacrificed and the lives saved ; and, though such instances are distinct and impressive, they are not in the least necessary to the argument. Usually expe- riments are made upon a number of animals which we are without means of computing ;* their results are collated with and modified by other trains of investigation; and the conclusion drawn affects an unascertainable number of patients, in different degrees, qualified by the varying skill of the doctors applying it. Moreover, such experiments do not always give the expected j-esult. Theories, which it was sought to prove by vivisection, have been disproved by * Except in England, under the new law, of course. AVHAT IS CRUELTY ? 29 it ; and the result of the experiment has been to detect mistake, instead of establishing positive truth. False tracks have been started upon ; and animals have bled and died, only to mark "No Thoroughfare" upon some tempting path. But though the result be negative, and the good done has been indirect, it has not been less real. Human victims would have paid the penalty of these errors, if they had not been ransomed by others of lower kind. Whether results are positive or negative, they all go to build up the fabric of an accurate and scientific physiology, upon which (as we saw before, and shall see later with more detail,) the success of medicine chiefly depends. Every patient any- where on the globe, who is treated by any civilised doctor, profits by this sound and accurate knowledge, which owes ISO much — how much I shall try to show in a subsequent chapter — to experiment. And as new lives come into being, and the human race increases, the number of those who thus benefit goes on ever increasing. The consequence is that though we cannot always assign the precise share of vivisection in any investigation of which it has formed a part, yet we can always know that — whether it be great or small — it is midtiplied by a practically infinite factor. While, if it was a painful vivisection, the pain was endured by a limited number of animals for a limited time. Thus, the greatest pain suffered for the smallest actual result would in time be fully counterbalanced, since the lowest iigure, when multiplied by infinity, exceeds the largest •definite sum. Much more is this the case when the result is large and visible to begin with. We conclude, therefore, that even where we have no means of knowing the number •of animals which have suffered, nor the exact degree in which men have benefited by their sufferings under expe- riment — the good still exceeds the evU in quantity. It may be objected to this argument that by it we actually destroy all proportion between the pain inflicted 30 PHYSIOLOGICAL CEUELTY. and the benefit expected, and would justify the most excruciating tortures, in prospect of the smallest possible addition to our knowledge. This would be true, but for two considerations. First, that in practice minute fractions must always be neglected. The very condition which saves the performance of a painful experiment from being cruelty — is the presence in the operator's mind of a distinct expectation of counterbalancing good ; but if this good is diffused and attenuated over infinite time, his finite mind cannot grasp it, and the condition is clearly destroyed. Secondly, the number of individuals benefited is not really infinite, but only practically so, because incalculably large and quite indefinite. The human race must some day become extinct, and all its physical triumphs die with it. These two considerations make a reditctio ad ahsiirdum impossible, and leave the plain and reasonable deduction — that in order to be justified in performing a painful expe- riment, and free from the charge of cruelty, the operator must have in view a benefit proportional to the pain inflicted ; Init that the benefit need not necessarily be proved to be as great to any one individual as the pain is, because it will be shared by an indefinitely larger number, durino' a much longer time. I cannot expect that the facts and arguments of the fore- going chapters will convince every one. When all has been explained and argued, there will still remain irrecon- cilables, determined to persist in their war against scientific experiments. But we can now see clearly what this war amounts to. It is an effort to keep many animals in suffering instead of few, men instead of beasts, the most sensitive creature instead of the less sensitive. Whereas, a true and humane physiology seeks to prevent as much as possible of human suffering, at the cost of as little as possible of animal suffering. On which side is the cruelty ? OUR RIGHTS OVER ANIMALS. -'51. CHAPTER IV. OUR RIGHTS OVER AXIMAL8. Experiments on animals asserted to be abstractly wrong — Reasr)ns usually given — Experiment not necessarily demoralizing to the operator — Universality and beneficence of tlie Law < if Vicarious Suf- fering — Our right to apply it to animals for our benefit — Vagueness of the principle generally acted on — The true principle — Mr. Button's principle — Impossibility of carrying it out — Summary. When we have proved that even pamful experiments upon animals need not be cruel, we have not disposed of the whole moral difficulty ; in fact, it is only then that we find ourselves face to face with the true crux of the question. The opponents of such experiments assert that they are wrong in themselves, and that therefore it is time wasted to prove that advantages are gained by them, since no profit can justify a crime. I most unreserved!}' admit that no hygienic gain is worth a moral loss, and that the health of one man's body is too dearly purchased by the disease of another man's soul. But ^-ague declamation is not enough. It must be clearly explained to us ivliy such ex- periments are v.''rong, apart from their object and result, before we can admit either to be quite immaterial con- siderations. The reasons usually given are four : 1st, tliat they are cruel ; 2nd, that the infliction of pain hardens and de- moralizes the inflictor ; 3rd, that it is unjust to make 22 PHYSIOLOGICAL CRUELTY. animals suffer for our good ; 4th, that it is an infringement of their rights which we have no authority to make. In the last chapter we saw that experiments, when per- formed for good reasons — are not cruel ; for they are intended to save more pain than they inflict ; and it cannot he cruel — of two sufferings to prefer the least. Painful experiments — done with a serious purpose and a sufficient reason — are no more demoralizing to the performer than painful operations. In both cases there must be an absorption in the object and the process which withdraws the nerves from much of the harass of sympathy ; but this is essential to the work being properly done, and has no more to do with demoralization than the hardness of a labourer's hand. It is difficult to see how the fact that the operator's object is in one case the good of his subject, and in the other the good of more numerous but remote l^atients, can make any difference in the eflect on his morals. It may make some in the effect on his feelings, rendering the operation the easier to carry through, because the object is more immediately to be reached ; but we must not confuse feelings with principles. Unsteady nerves are not the same thing as sensitive consciences ; and the fact that people cannot bear to see or give pain means much more often that they are weak and selfish than that they are particularly humane. Next comes the more serious assertion — that it is unjust to make animals suffer for our good ; and as many ex- periments are made in investigating the diseases of animals, this spreads itself out into the general question : 7s it right that one creature should suffer for the good of o,nother? Vicarious suffering is one of the darkest mysteries — as it is one of the most comprehensive laws — of the sentient world. There are times when we all rebel against its terrible and unequal pressure, and cry out passionately : OUR RIGHTS OVER ANIMALS, 33 ' ' That not a moth with vain desire Be shrivelled in a fruitless fire, Or but subserve another's gain." But in saner moments we bow before its stern beneficence, and recognize that it alone has moulded the forms of beauty and strength which we see around us in insect, bird, and beast ; and that it alone is developing rarer and higher beauty in the spiritual life of man. The most insignificant fly that dances through a summer's day opens out its mar- vellous little wings with strength and dexterity, because thousands of other flies that were slow and clumsy were snapped up by their enemies ; the robin pipes his autumn song, because dozens of quiet caterpillars and writhinf»" worms have been pecked to death to feed that cheery sweetness. It is not all horror. The less goes to make the greater, the imperfect fades before the perfect, the whole creation groans and travails in pain together, yet the New Heavens and Earth are ever being born. Much more is it so in the world of men. By this law the human race is solidaire. The sins of the fathers are visited upon the children, and the children's sins are a curse to their fathers ; but so also a blessing descends from generation to genera- tion, and only those who stand within the shadow of the curse can lighten it. Suflering with the suffering, or for the faults and errors of other men, is the lot of all ; but the knowledge of what it is so to suffer, and the certainty that our own faults and errors will lay the like on others, are among the most powerful motives to hold us back from evil. Were not our hearts bound to each other by cords which wrench one when another breaks, we should be a mass of disintegrated units, with no common life, no racial unity, lower than the beasts who do feel— if not for, at least, with each other. And this we admit and express in our worship. The apotheosis of utter self-sacrifice is that around which D 34 PHYSIOLOGICAL CRUELTY. the Christian's most sacred thoughts and aspirations cling, which he aspires, however dimly, to imitate ; at least, which he owns as the perfect ideal of manhood. And those who do not believe that that ideal ever ' ' Had breatli, and wrought With, human hands the creed of creeds," must still confess that (tried by the most utilitarian standard) the great law of nature which secures the benefit of all by the sacrifice of some, is justified in its working. In the abstract, then, we declare that it is right and well that one should suffer for the sake of another ; there is nothing in it at all revolting to our moral feeling. We live by and under this law ; we submit to it, because we must ; we accept it, if we are wise. It is not possible to carry on this discussion with any one who rebels against it ; he must become a loyal and law-abiding subjectof the world he lives in, before he is qualified to discuss its administration. The remaining question is : Have lue the right to constitute ourselves administrators of this laiu, and to apply it to animals for our own interest ? Nature will do so in the interest of their race if we let her alone ; but when we domesticate any creature, we to a certain extent protect it from her action. We withdraw it from the struggle for 3xistence, and substitute artificial for natural selection. We do not allow it to be starved out by stronger compe- titors, or devoured by wild enemies. Have we then entirely delivered it from the general law, and are we bound to make its existence nothing but a pleasurable one ? Of course no one says anything so unreasonable. It is generally admitted that we may chase and kill an animal, often necessarily with much pain, not because its life and liberty interferes with ours, but because its death will render our life more complete, perhaps in the most trivial detail. We kill them (without anaesthetics) not only that OUK RIGHTS OVER ANIMALS, 35 we may have food and clothing, but that the food may be varied and attractive, and the clothing rich and beautiful.* We subject them to painful mutilations in order to make them more manageable for service, to improve the flavour of their flesh, and even to please our whimsical fancies. We imprison them in cages and Zoological Gardens, to improve our knowledge of Natural History, or merely to iimuse ourselves by looking at them. It is abundantly clear that in all our customary dealings with animals we apply to them without scruple the law of sacrifice, and interpret it with a wide latitude in our own favour. What was said in the preceding chapter about the respective values of human and brute activities will go to justify as much of this as is justifiable ; but it is certainly carried too far, and there is a great want of a fixed standard. So far, the general principle of dealing with animals which is in a vague way accepted by most humane persons, but seldom distinctly formulated, seems to be that we may kill, inconvenience, or pain them, for any benefit, conven- ience, or pleasure to ourselves ; but that the pain must be within moderate limits (of course undefined), and that it must form no element in our pleasure. For this I propose to substitute the far stricter rule, that we must commit no cruelty towards them, — defining cruelty as the infliction of pain without an adequate good object. This goes far beyond what is usually put in practice, and any one who tries to apply it in every case will find it a sufiiciently stringent limitation. But it certainly does not come up to the new principle which we are askedf to recognize, even the same * Sardines, wliite-bait, shrimps — compare the amount of food and the loss of life implied in the words. Fur trinunings, ornamental feathers, gloves— what is the proportion there between the satisfying of human needs and the destruction of animal enjoyment ? t By INIr. Hutton, Nineteenth Century, January, 1882, p. 37. d2 36 PHYSIOLOGICAL CRUELTY. that we find it so hard to carry out towards our fellow-men, the golden rule of doing as we would be done by. "We are told to " put ourselves in the place of the lower animals, and ask what we, with their pains, and their sensitiveness, and their prospects of life, and pain, and happiness, might fairly expect of beings of much greater power, but of common susceptibilities." This brings us to our fourth point, the infringement of the rights of animals ; and we can best- discuss it in discussing Mr. Hutton's proposed standard. To begin with, such an effort of the imagination is almost impossible. If we transplant ourselves into the place of the lower animals, it is always we who are there ; we, with our own susceptibilities, not theirs, and our intellects working- up the raw material of their feelings. This is precisely what we see happening in a great deal that is written upon this subject. People talk about the rights of animals, and import into the discussion the very feeling of personal outrage and wrong which they themselves would have if any of their own were invaded. But the sense of individual rights is not even necessarily human. How much of it can a Fijian have, who stands still to be knocked on the head, because " the king has willed it ; "* or a Dahomean, who> belongs to a nation of which every man is the king's slave ? Probably the Fijian does not like to be knocked on the head, any more than an ox does, but it is absurd to assume in the beast a sense of injury which is absent in the man. The fact is, that we can realize an animal's sensibility, but not its insensibility ; its knowledge, but not its ignorance ;. its powers, but not their limitations. Nothing is more hope- less than the attempt to expel from our minds that with which we are perfectly familiar ; the old knowledge will sneak in again at the back door of our argument, and we shall find * Spencer's "Principles of Sociology," vol. i. p. 583. OUR RIGHTS OVER ANIMALS. 87 it quietly underlying the most novel deduction. This is so with the sentence quoted from Mr. Hutton, where the inno- cent-looking words " fairly expect" involve the whole sense of mutual duty and personal right which is exclusively human, and which some races even of men have yet to be educated up to. We shall see this more clearly if we attempt to make the supposition which he proposes. We must try, then, to imagine ourselves belonging to superior beings, who make us obey them in all things, and whose reasons we can seldom understand. They tie or shut us up, in order to prevent our going where we wish — they whip us, to make us go where they wish — they prevent our making love, for fear of its interfering with our work — they keep us in prisons, because they like to look at us and hear us sing — they take away our clothes, in order to wear them themselves — they crop our ears, because they think we look prettier with them short — they do various painful thino-s to us, in order to make us taste nicer when cooked — and, finally, they kill and eat us. We are ignorant of most of their reasons for these unpleasant proceedings ; but just in proportion as our intellects are developed and our cha- racters fine, we acquiesce in this state of things, and are loving and loyal to our masters, with an unquestioning obedience and an unrebelling submission. But having come to this point, if we were suddenly enabled to understand the reasons for each action, our dispositions remaining the same, is it likely that the sense of injury which had not been evoked by anything else would arise when they went on to use us for experiments for the advancement of their science, and the improvement of their own health ? If we were willing to be killed in order to support life as food, why should we object to die in order to preserve it by knowledge ? Of course, it is an absurd supposition altogether ; the con- fusion between what animals cannot possibly understand, 38 PHYSIOLOGICAL CRUELTY. and what we should have to suppose ourselves in their place understanding, in order to pass judgment on the morality of their treatment — is inextricable, and altogether it is an idea that cannot be worked out ; but the attempt to apply the " put yourself in his place" argument altogether fails to convince us that under any circumstances we should object most to the pain inflicted for the best reasons. Mr. Hutton is willing to admit the inoculation class of experiments, " especially as these inoculations may well benefit not only man but the very creatures who suffer them." It is not clear whether he means the individuals which suflfer, or the Jcioid of creatures. If the former, the consideration has little force ; because in every series of such experiments, the failures must be the majority, — for when marked success has been reached, the experiment is at an end. If the latter, it follows that he thinks it more moral to cause an animal pain for the sake of others of the same species than of others of a higher order. It is difficult to follow this reasoning, or to see what difference it would make to the creature concerned. Let us gather up the scattered threads of this chapter. We have proved that all creatures — human and other — live under the Law of Sacrifice ; and that animals owe their physical prosperity — and men their social union and spiritual elevation — to this Law, in the first place submitted to un- consciously, in the latter accepted more or less deliberately. We have seen that when we withdraw animals from the natural action of this Law, we apply it to them ourselves for our own interest, and that this is the condition of their being of value, use, or pleasure to us. We have laid down for our guidance in dealing with them the rule of causing them no pain without an adequate good object, and have found it to be more stringent than any at present prevailing. OUR RIGHTS OVER ANIMALS. 39 We have found it impossible to go further, and apply to them the Golden Rule, the differences in nature, sensibility, and intellect, being insuperable by the imagination. But we have seen no reason to suppose that it can be lawful to give pain for purposes of human convenience, pleasure, business, or food, — and unlawful to give it for purposes of human health and knowledge. We therefore conclude that to make iKtinful experiments upon living animals lies luithin an universally recognized right over themi, and is not tvrong in itself, hut dependjS for its morality or immorality u]pon the circumstances and motives of each particidar act. 40 PHYSIOLOGICAL CRUELTY. CHAPTER V. WHAT IS VIVISECTION ? Wliat is Vivisection ? — Various definitions — Dissecting alive — True sense of the word — Course of study in physiblogical laboratories — Histological department — Chemical department — Physical depart- ment—Experiments upon detached tissue and organs — Experiments upon pithed animals — Painful experiments — Inoculations — Testing of drugs — Use of anaesthetics — Statistics of experiments performed — Conclusion. We have now made some progress in our inquiry. Having obtained a clear conception of what pain is, we have seen when its infliction is justifiable, and when it amounts to cruelty, and we have also decided that we have a right to inflict it upon the lower animals, when necessary for the purposes of beneficent science. We have to deal with an entire denial of that right, and a determined effort to abolish the power of using it. It therefore' seems as if our next step should be to ask what use is made of it already. What is the state of affairs which it is proposed to improve upon ? To what extent is vivisection practised in England ? But another question must come before this. What is vivisection ? Literally, of course, the cutting of a living thing, such as opening an oyster, crimping a cod, or foxing a terrier. Sir Thomas Watson rather vaguely explains it as " the cutting into any living animal for scientific pur- WHAT IS VIVISECTION ? 41 poses."* " Vernon Lee "f says that " vivisection is a generic name for torture," an expression of which much meditation has hitherto failed to reveal the meaning. Webster's dic- tionary gives it as : " The dissection of an animal while alive, for the purpose of making physiological investigation." Probably this is a fair statement of the popular notion.^ Many people suppose that — just as an anatomist lays bare nerve after nerve and muscle after muscle in a dead body, tracing- each from its source to its remotest ramification, until he is thoroughly acquainted with its position and relations — so the physiologist studies the functions of living organs, displaying them and watching their working in the living body, and making each subject serve for as many experi- ments as possible, until death renders it useless. Nothing less than such an idea will justify the language used by some of the anti-vivisectionists about "the most cruel of cruelties." Still, it is rather out of date, for it is about two hundred years since it represented any existing fact. No doubt, the anatomists of the middle ages did cut open living bodies to see what was going on inside ;§ but now, the coarser structure and general relationships of the prin- cipal organs are understood and taught on the dead human .subject, which in olden times was out of the reach of the most skilled anatomist. As we shall see, there are other means of teaching the functions of the different parts of the body to students than the old actual vivisections. The experiments now performed on living animals are delicate .and difficult ; they require much time and expensive instru- ments ; some of the most important involve very little operating; and there is nothing at all corresponding to * Report of Royal Commission, Appendix III. , § 1. t Contempurary Review, May, 1882, p. 707. + See Appendix A., H 5. ^ The practice was recommended by Bacon, see Appendix C. , IT 11. 42 PHYSIOLOGICAL CKUELTY. dissection, or " cutting up." Webster's definition is there- fore misleadinof, and the literal meanino- is valueless for this discussion. One might speak of vivisecting a plant, for there is vegetable life as well as animal ; and it is certainly vivisection to cut up tissue which is itself living, though removed from a dead animal. But this sort of thing is not what people mean when they talk about vivisection. They mean making any experiment upon animals which gives them pain, whether there is any cutting- in it or not ; they generally have some loose ideas about dissecting alive, like Mr. Webster's ; and the more careless or dishonest of them throw in " torture " as a natural accompaniment, without waiting to inquire into the degree of pain caused. The word has thus become so vague as to be almost useless for purposes of argument, and I have hitherto tried to dispense with it as far as possible, and shall continue to do so ; but if I am obliged to use it, it will always be in the true sense of cutting a living thing, whether animal or vegetable, sentient or insentient, an organism or a part of an organism. When experiments on living animals are in question, it is easy to call them by their right name. Only a small part of the work done in physiological laboratories consists of such experiments, but though their proportion to the rest is small in quantity, it is large in importance. Both statements Avill be best explained by a short review of the various sections into which Practical Physiology is divided, both in text-books and in teaching establishments. These will usually be found to be four : i.e., the Histological, Chemical, Physical, and Yital departments.* In the Histological department, the pupil studies — by means of the microscope — the minute structure of the tissues of animals and plants. The living animals examined * See "The Practice of Yivisection in England," by Professor Yeo. — Fortnighthj Bevieiv, March 1, 1882. WHAT IS VIVISECTION ? 43- are (with very few exceptions) tiny animalcule, wliicli swim about under the glass with every appearance of ease, and do not seem to consider themselves victims to science. The common exception is the frog, the web of whose foot is spread out under the object-glass, that the course of the living blood-corpuscles through its transparent substance may be observed. In this case there is no -section at all, and the animal is not injured in any way. It is wrapped in damp cloths, and its toes are held apart by soft threads attached to their tips. Every precaution must be taken against hurting the frog, or irritating its toes with the thread, or even the moderate heat of the human hand, — as the least roughness or want of skill in operating would interfere with the value of the observation, by increasing- or checkino' the flow of the blood in the delicate vessels. A small portion of living tissue is often studied in this department, but then it has been taken from dead animals. Every one, perhaps, may not know that the tissues have an independent life, which may survive for some time the death of the organism, if that has taken place while they were in health. In this way, the movements of the living- cells of man's blood, the contracting of insects' muscles, and many other vital phenomena, may be observed. This study of life without a living creature is not vivisection in the popular sense ; on the contrary, it is necessary that the animal from which the tissues are taken should have been killed as rapidly as possible. On the whole, then, it is clear that in the histological department, which consti- tutes, probably, a fourth of the whole laboratory work, and is the first and most important division of that work in which students have to take an active part — there are no painful experiments, and the vivisections performed are only upon little bits of tissue, and not upon animals. We next come to the Chemical department. Here the 44 PHYSIOLOGICAL CRUELTY. student learns the nature and composition of the secretions and excretions, how to test them, and judge of their cha- racter, — knowledge that will he most important to him in ■diagnosing disease, but in gaining which he works on fluids brought to him in the laboratory, collected painlessly from living human beings, or extracted from the gland-textures of dead animals. Here there is no cause of dispute. What I have called the Physical department is that in which the forces of nature are studied in their relation to vital phenomena. The student is provided with an elemen- tary knowledge of the laws of dynamics and mechanics, sufficient to make him understand the action of the atmos- phere in its pressure upon the lungs, the working of the muscles as levers, the principle of the pumping of blood through the body by the heart, &c. Here also mechanical appliances are introduced, to explain the working of the organs, and to investigate and accurately measure the actions of various parts of the body. Models are shown, illustrating the process of breathing, the alternate con- traction and expansion of the heart, the wonderful move- ments of the eyeball, — and the apparatus by which a ray of light is refracted, so as exactly to meet the ending of the optic nerve, and excite visual sensations. The very raison -d'etre of all these expensive and elaborate models and instruments — is to dispense with vivisection. Artificial lungs and mechanical eyeballs would be merely curiosities of inventions, if professors were in the habit of exposing the actual palpitating organs to their pupils' gaze, in the body of a living animal. The instruments for measuring the action of certain -organs are indeed used upon living animals, but there is no pain in their application, and the subjects are generally human. The cardiograph writes down the manner in "vvhich the heart beats, the sphygmograph registers the WHAT IS VIVISECTION ? 45' character of the pulse, and the ophthahnoscope enables the surgeon to explore the recesses of the eye, and judge of the condition of the nerve itself. The student learns the use of these instruments as well as of the laryngoscope and the thermometer for his future bed-side practice ; but the in- convenience which he inflicts in the process is very trifling, whether he experiments on himself, his relatives at home,, his fellow-students, or the lower animals. At any rate, nothing takes place in the Physical department which need excite any horror, or raise any moral discussion. The fourth department is that in which the painful experiments on living animals take place, but they are very far from forming the whole of its work. As in histological investigation, experiments are often made upon living tissue from a dead creature, so here the laws which govern the action of the heart, nerves, and muscles, can be to a great extent studied in organs removed from a re- cently killed animal. If a frog be beheaded,* and its heart extracted, the heart will continue to beat for hours after it has been separated from the body, and influences which will quicken or retard its action may be tried upon it. Nerve-fibre can be stimulated, and muscle wdll contract after they have been taken from an animal thus killed,, and their actions can be excellently studied.-f- Much that was first discovered by vivisection can now be shown and explained in this painless but eflective manner ; and in our English schools it is so explained, and a living creature is never used where a dead one will do. Next in order to these experiments upon organs, come experiments upon entire animals, deprived of consciousness and partially of life, by pithing. The creature is put under * This mode of death leaves the reflex phenomena of the spinal cord in fullest operation. t See Memorandum issued by the Association for the Advancement of Medicine by Research, p. 6. 46 PHYSIOLOGICAL CEUELTY. an ansestlietic, and the spinal marrow is divided. The nervous centres which preside over the breathing move- ments are thus injured, so that it would die, if oxygen were not supplied to its blood : but by means of a kind of air- pump, artificial respiration is kept up, the heart continues to beat, and functional life is maintained. Still, as has been fully shown in Chap. II., the animal is not really alive ; for it is not capable of spontaneous action, and all sensation has been destroyed, by cutting the communication between the brain and the nerves of the body. The whole appa- ratus, is in the condition of a telegraphic circuit with the wires and battery perfect, but with no operator to work them : there is still receptivity in the instrument, energy in the battery, and conductility in the wire, but there is no spontaneity of action, and there can be no message. We now come to experiments more nearly corresponding to the popular idea of vivisection; i.e., those which involve incision or cutting, are performed on living creatures, and are of a nature to give pain, if the subject is not prevented from feeling it. To begin with, it cannot be too often repeated, that in England animals are never " cut uj) " at all, nor are they dissected alive in order to sJioiu the relations of their j)arts. This is taught, as has been already explained, by means of dead subjects, models, and diagrams. When vivisections are performed for teaching purposes, they are done in order to show to students some- thing necessary for them to know, but which they cannot be taught equally well otherwise ; and under the present law ansesthetics must always be used at such demon- strations. So that there is no room for talking about medical students being demoralized by witnessing tortures : there are none for them to witness. Vivisections in original researches are performed only when the question in hand cannot be solved by chemistry, histology, or any WHAT IS VIVISECTION ? 47 other of the means at command, and always with a definite object in view. The " random experiment " under which we hear of creatures expiring in torment, exists only in the minds of certain excitable but ill-informed writers. Painful vivisections are therefore confined to purposes of original research, and in the few cases where pain must be given, it is generally very slight. One large class consists of inoculations, which are chiefly used in studying the orio'in and communication of diseases. There are a few pricks and scratches, giving about as much pain as vacci- nation : and if the disease expected is induced, the subject is usually killed at once, unless kept alive to try modes of treatment. In the former case, it does not suffer ; in the latter, it is carefully nursed and doctored ; and as most sick people prefer being treated to being extinguished, we may fairly suppose that an inoculated rabbit would gladly countersign a certificate to permit the doctor to keep it alive. Another large class of experiments consists in trying the effects of drugs upon animals, as a guide to their use upon human patients ; or, in the case of poisons, to study their antidotes and treatment. They are generally administered by injection under the skin, and the — section consists only in pinching up a portion of it, and inserting the pointed nozzle of a syringe. The pain of the actual opera- tion is merely a prick, but that which results will be more or less, according to the nature and action of the drug. There then remain a number of experiments which cannot be further classified, relating to the various animal functions, varying according to the points which scientific men desire to ascertain, and which the Home Secretary does not con- sider useless knowledge. In most of these, anaesthetics can be used. Whenever they can be used they are, and always were, before any law was passed on the subject. This was proved abundantly before the Royal Commission, and is 48 PHYSIOLOGICAL CRUELTY. recognized in their report. Yet, although no fact is better authenticated than this systematic narcotizing of creatures experimented on,* it is quietly and constantly ignored, vivisection is described as the " worst form of cruelty we know/'-f- and the words " agony," " torture," and " torment "" are scattered about as if no such things existed as chloro- form, ether, and morphia. But this is contrary to common sense. If an experimenter did not use them for the sake of humanity, he would for his own convenience. Can any one suppose that it is agreeable to a man conducting a difficult investigation to have the subject crying and rest- less, when he requires perfect stillness for the sake of Ills' delicate instruments, and undisturbed concentration for his own mind ? An anaesthetic of some sort is absolutely necessary for the success of most operations, and equally needful for the feelings of most operators. Doctors are men, — men, the whole object of whose lives is to relieve sufferino^, who live to heal and soothe, and whose feelino;s are constantly cultivated by demands on their help and sympathy, their skill and tenderness. Working physiologists share these influences. They are not a caste of Fakeers, cut off" from all the gentlenesses of life, and vowed neither to pity themselves nor others. They have at home not only their wives and families, but the little child's pet kitten, the devoted dog, their own favourite horse, — all the friendly animal world which gathers round an English home, seldom so poor that it does not hold a pet. Why should it be supposed that they like to hurt a helpless creature lying at their mercy ? As a matter of fact, they do not ; and Mr. Colam's often-quoted evidence % is alone sufficient to show * See Digest of Replies to Questions forwarded to the principal Medical Schools. — Report of Royal Commission, Appendix III., § 8. t Miss Cobbe, in Contemporary Bemeiv, February, 1877. X See Appendix B, H 4. WHAT IS VIVISECTION ? 49 that no such charge against them could for one instant be supported. If anaesthetics are not constantly mentioned in text-books, it is because their use in every laboratory is talcen for granted.* But experiments are sometimes performed without anaesthetics ? That is true ; it can be done under a special certificate ; and let us now see to what extent — under the law as it stands — it is done. We have the reports presented to Parliament of the experiments performed in the years 1878, 1879, and 1880. In the report for 1878, the inspector says : " In 16 cases alone, so far as I am able to judge (and these were confined to two sets of experiments), is there any reason to believe that any considerable amount of suffering was directly inflicted." In 24 cases, animals suffered, not from an actual operation, but from induced disease. The report for 1879 states : " The number of experiments in which there is reason to believe that any material suffering was caused appears to have been about 25. Of these, 15 were cases in which disease followed the inoculation of infectious matter, but in which no painful operation was performed ; and 10 were experiments upon as many frogs, in which an incision of the skin was required for the introduction beneath it of a medical substance." The account for 1880 is similar. In about 30 instances disease was induced, " which, during the brief period the animals survived, may have caused slight suffering." There were no other painful experiments.-|- This then is the sum total of the pain-giving experi- ments upon animals performed in England during three years. Less than 100 cases, of which the great majority consist of inoculations, followed — not by torture, but — by illness, form the contribution of our country to the " syste- matic torturing of thousands of beasts all over the world," * See Appendix B, IF 4. t See Appendix B, IT 5 E 50 PHYSIOLOGICAL CEUELTY. referred to by a writer on the subject.* It is a pity that 95 animals should have been put to any discomfort at all ; and if illness and pain could be abolished from the world at one blow, the happiness of the lower creatures would be no small ingredient in the general joy. As it is, however, physiologists must aim at something humbler ; they must try to decrease what they cannot destroy, and to alleviate where they cannot heal. And those who wish to narrow the means at their command for doing so, by totally prohibiting experiments on living animals,-f- had better be quite sure that they know what the state of things is which they propose to alter. The same writer says that " experi- mentations on living animals is a system of long protracted agonies, the very recollection of which is enough to make the soul sick as with a whifF and an aftertaste from a moral sewer." The degTee of correspondence between this phrase and the facts of English physiological practice will be apparent to the reader of the foregoing pages. And it is with facts alone that we wish to deal. * Contemporary Bevieiv, May, 1882, p. 803. t A Bill for the total Abolition of Vivisection is to be presented to Parliament this Session. THE RELATION OF EXPERIMENT TO PHYSIOLOGY. CHAPTER VL THE RELATION OF EXPERIMENT TO PHYSIOLOGY.* Many non-physiological systems — Only one physiological system — The Empirical system — The physiological system founded on experiment — Experiment on living animals part of a rational method of invest- igation — The Circulation of the Blood — Blood pressure — Contractile power of the arteries — The Absorbent Vessels — Discoveries of Aselli and Pecquet — Value of this knowledge — Respiration — Changes effected in the inspired air — Changes effected in the blood — Diges- tion — The Nervous System — Discoveries of Bell, Magendie, and others — Present state of our knowledge on the subject — Muscular action — Discoveries of Heller — Summary. Since human beings first writhed under the ills that flesh is heir to, and strove to escape from them, various different systems of medicine have won the confidence and relieved or aggravated the sufferings of mankind. How- ever many they are, they must all fall into one of twO' classes — the physiological and the non-physiological. Phy- siological medicine is founded upon study of the organs "of the body and their modes of action : that is, upon a know- ledge — the more thorough the better — of the mechanism, with which it has to deal. Althouo-h, as lonff as this know- ledge is imperfect, different conclusions may be drawn from * For the information contained in this and the following chapter, I am largely indebted to an Address delivered before the Surgical Society of Ireland in 1878, by Dr. Robert McDonnell, to Professor Heidenhain's Pamphlet, "Die Vivisection im Dienst der Heilkunde,"' Leipzig, 1879, and to the Arris and Gale Lectures of 1882, delivered, by Professor Gerald F. Yeo, and published in the Lancet, June 10, 1882, et seq. E 2 52 PHYSIOLOGICAL CRUELTY. it, and different methods of treatment proposed and tried, so that it may seem as if there were various physiological systems, yet in reality there is but one ; for all phy- siological workers acknowledge the same principles, and can correct and supplement each other's work, — so that the mistakes of yesterday are set right by the discoveries of to-day, and these will be developed by the results of to-morrow. It is not so with the non-physiological systems. These are many and various, and are based upon principles which are mutually irreconcileable. Nearly all of them, also, have their modern representatives, but I shall not risk bringing all these down upon me at once by specifying their parentage. In the earliest times, when every disease was attributed to the anger or malice of some spirit, the only system of medicine known consisted in attempts to propitiate the offended power. Later on, under the influence of Greek intellect, this gave rise to something more deserving of the name. The origin of the empirical system of medicine is very interesting, and it certainly has a solid foundation, since it rests upon the observation of facts. The priests of some of the Greek temples (certainly of that at Cos) to which people used to resort in search of miraculous cures, kept records of the names of the patients, their diseases, and the means (other than miraculous) taken to cure them. These were inscribed upon metal plates, called votive tablets, and were carefully preserved. Hippocrates, himself a priest of Cos, formed the accumulated experience of the temple into his great system, which at least, as has been said, rested on facts and nature. The empirical school has had varied fortunes, sometimes sinking into mere vulgar blun- dering, and sometimes having the success which attended the patient listening to nature, in days when men did not know how to question her. But the mere collection of THE RELATION OF EXPERIMENT TO PHYSIOLOGY. 53 information without reasoning upon it is simply useless, and a hundred disjointed facts will no more make one truth than a bag-full of acorns will make one oak. One of those seeds, planted in the right soil, and duly tended, may grow into a noble tree ; and one of those facts, in the mind of a man of genius, capable of seeing its relations and working out its results, may lead to a great discovery. Thus empi- ricism — or the mere observation of nature — never created, or could create, a sound system of physiology. It is a system of hits and misses, free from humbug, but not trust- worthy ; because it works on the supposition that one case will be exactly like another, whereas no one case ever is exactly like another. It would take a volume to sketch the various non- physiological systems, and the results to unfortunate patients, in days when, there was no such thing as systematic physiology. For there is no third alternative. So far as the physician knows the structure of the body with which he has to deal, the relations of its functions and the working of its organs in health, — so far as he can recognize disease, trace its causes and consequences, and calculate upon the effect of the treatment which he adopts — so far he is working in the light, and is likely to succeed. But so far as he is guessing, theorizing, and experimenting on his patient, — so far he is groping in the dark, and is likely to fail. These seem very elementary truths, but it is some- times necessary to insist on the most obvious things, when they are overlooked ; and the def endei"s of science are obliged to spend such eloquence, research, and time, as are at their command — in defending this apparently unassail- able position: It is necessary that a doctor should know what he is doing. Or, in scientific language : Kational thera- peutics are based upon sound physiology. But is the physiological system of medicine firmly 54 PHYSIOLOGICAL CRUELTY. founded upon knowledge that can be relied upon ? and if so, what share has experiment had in attaining this knowledge ? To begin with, it must be noted that experiment upon living animals is not a thing by itself. It is part of a system — the physiological system, and part of a method — the experimental method. No great discoverer was ever a vivisector, and nothing more, though every great physio- logical discoverer has been a vivisector. He did not spend his time in the " random experiment " in which his pro- fession are supposed to delight ; he had something better to do with it. While his mind was open to all ideas, his thoughts were bent on one ; he learnt what anatomy could teach him of the matter in question ; he watched by sick beds, and observed accidental circumstances ; he studied the doings of other workers, and meditated upon them ; he probably — if the subject admitted of it — experimented on himself. All these things — anatomy, clinical observation, and meditation — are absolutely necessary ; but they are parts of an accurate and scientific manner of investigation which cannot dispense with the additional means of experiment on living animals. For it is really the touch- stone by which the theories starting from the other methods are judged, and the results obtained from them are studied. In order to trace, as briefly as possible, consistently with clearness, the dependence of physiology upon experiment, let us take in turn some of the great branches of such knowledge, and inquire what were the earliest ideas held on these subjects, what knowledge upon them we have arrived at, and what share experiment has had in leading us to this point. For the sake of brevity, it will be under- stood that experiment means experiment upon living animals, unless otherwise stated. Of course, I must assume THE RELATION OF EXPERIMENT TO PHYSIOLOGY. 55 in my readers such a general knowledge of elementary- physiology as every educated person ought to possess ; without which it would be absurd for any one to attempt to form an opinion on the subject of vivisection. To begin, then, with the Circulation of the Blood. It is difficult to take ourselves in imagination back to a time when the use of the arteries was utterly unknown. Yet Erasistratus, who preceded Galen, thought that they contained nothing but air. Galen (who flourished about 131-201 A.D.) was a diligent experimenter, and vivisection soon taught him that this was not the fact. He says : " If one cut many arteries at the same time, they will all let blood escape. This is a fact known to all the world." He, however, thought that they carried both blood and air ; and that their chief business was to conduct air (or vital spirits, as he called it,) from the heart to vivify the whole body. The nourishing material from the food was collected (according to his views) by the gastric and intestinal veins, and carried to the liver, where it was made into blood, which was then distributed to the various parts of the body by the systemic veins. Some of the fresh blood comino- from the liver flowed through the rio-ht side of the o o o heart, and was conveyed to nourish the lungs, by the pulmonary artery. He thought that the current flowed backwards and forwards in the arteries and veins alike, the former carrying the nutritive, the latter the vital blood. This curious mixture of fact and fancy was all that was attained by the first great experimental physiologist,* and it is noticeable that the facts are clearly due to vivisection, which alone could have shown him the presence of the blood-flow in the vessels, and which convinced him (in spite * We know that experiment formed a part of Egyptian medicine, Taut witli our present imperfect knowledge of the state of that science in Ancient Egypt, this must be passed over. 5(j PHYSIOLOGICAL CRUELTY. of his former theory) that all the arteries contained blood- Although he had gone thus far in 200 A.D., yet at the beginning of the l7th century, we find knowledge of this subject in much the same position. The great motor power of the heart was unknown, the direction and con- stancy of the flow of blood through the vessels of the system had not been ascertained, and the circulation through the liver was a complete mystery. How was this ? Had not doctors been practising, binding up wounds, ob- serving patients, and reflecting upon what they saw, during those fourteen centuries ? They had ; but they had not been experimenting. Vivisedors there were, in the true sense of the word, who really dissected animals alive,, in order to study the parts of the body ; but these were anatomists, not physiologists. The few experiments that were performed were not sufiiciently numerous, careful, or systematic, to produce any result worth mentioning. In 1 628„ Harvey picked up the wonder-working rod that had fallen from the hand of Galen, and physiology moved on again. It was more than a move ; it was the greatest stride that the science ever took at one time. The discovery of the Circulation of the Blood was to Physiology what that of the Law of Gravitation was to Physics. Let us learn from his own words how he arrived at it.* "When, in 'many dissections of living things (as were- given to hand) I flrst applied my mind to observation,, whereby I might discover the wont and utilities of the heart's motion by personal inspection, and not by the books. and writings of others, I found it a hard subject indeed, and so * As the verbal accuracy of Dr. Willis's excellent translation has been impugned, I give a baldly literal version, in order to minimize causes of dispute. The question of Harvey's priority is discussed in. Appendix D, "IT 1. THE EELATION OF EXPERIMENT TO PHYSIOLOGY. 5T constantly full of difficulties that with Fracastorius, I might almost think the motion of the heart to be known to God alone. For neither in what way systole or diastole might take place nor when, or where dilatation and contraction might exist, could I rightly distinguish, on account of the ra- pidity of the motion, which in many animals in the twinkling of an eye — as if in a flash of lightning — brought itself into view and straightway vanished ; so that I might think now I perceived systole on this side, diastole on that, at another time the contrary, the motions to become A^arious and con- fused ; whereby my mind fluctuated, and I could not come to any resolution mj^self, or believe others, and I was not astonished that Andrew Laurentius wrote that the motion of the heart was what the flow and ebb of the Euripus was to Aristotle. At length, from day to day using greater- research, and diligence, hy frequently looking into many and various living animals, I thought to have both attained the object, and to have escaped from this labyrinth,, and at the same time to have discovered things which I desired, the motion and wont of the heart and arteries.. From which I was not afraid to put forward my opinion in this matter not only to my friends in public, but also in my aliatomical lectures, in the Academic method."* Harvey did not know all the details of the course pursued by the blood, especially of the manner in which it made its way from the arteries into the veins. Malpighi, who was- the father of minute anatomy, was the first to see it in the capillary vessels, and he demonstrated its passage through the capillary network of the lung of a living frog by a genuine vivisection, thus adding the last link to Harvey's chain of evidence. Comparatively recently, the experiments of Waller and * "De Mohi, Cardis et Sangirinis." Cap. I. 58 PHYSIOLOGICAL CRUELTY. Cohnheim have taught us that the walls of the capillaries will allow the solid — as well as the fluid — parts of the blood to pass through them ; and as a white corpuscle has been seen to creep through the thin walls of the vessel, we now know that not only does the blood convey nourish- ment to the tissues, but that these mysterious little units of protoplasm, which are the active agents in the forma- tion of new tissue, can start from it on their work of re-creation. The pressure of the blood against the walls of the arteries was first studied by Dr. Stephen Hales, vicar of Teddington. In 1732 he published his Statical Essays, in which he described the experiments by which he estimated the force of the heart. His methods of measurement were improved upon by Poiseuille, and the whole subject of haemo-dynamics (or the force of the blood) was funda- mentally investigated by Volkmann. Of course, it could only be studied upon living animals. As a result of these investigations and experiments, there are now a number of instruments (the kymograph, sphygmograph, and cardio- graph,) which enable physicians to observe — and record graphically — the most delicate changes in the circu- lation, and are most valuable in studying the fluctuations of disease. Just when the discovery of the immense pumping-power of the heart was threatening to degrade the arteries into mere conduit-pipes, it was discovered by Haller that they possessed a distinct coat of muscle-tissue and an inde- pendent power of contracting, so as to press upon the blood which they contained. John Hunter's experiments upon the horse, and Dr. John Thomson's demonstrations on the frog's web, put the matter beyond doubt. Claude Bernard, Brown-Sequard, and other experimenters, gradually showed the wonderful muscular and nervous systems by which THE RELATION OF EXPERIMENT TO PHYSIOLOGY. 59 this contractility is produced and governed, and which are constantly at work, regulating the blood-supply to the various organs. Let us now sum up what amount of our knowledge of the blood and its circulation is due to experiments upon living animals. In this manner we have learnt that the arteries contain blood (Galen) — that it is driven into them by the pumping action of the heart under high pressure, and so forced through the body, and that the veins collect it and return it to the heart (Harvey) — that it passes from the arteries to the veins through the capillaries (Malpighi and Leeuwenhoech) — and that it conveys solid nourishment and formative agents to the tissues (Waller and Cohnheim). We can measure exactly the force of its pressure against the vessels which contain it (Hales, Poiseuille, Volkmann) ; and we understand the manner in which these vessels con- tract and dilate, and the nervous system which causes them to do so. It would be quite impossible, in a little book like this, to show in detail the influence which these experiments have had upon medical practice, and how clear an insight they have given physicians into the true interpretation of the various kinds of pulse, the changes in the heart's beat, &c. The question to be asked is not — When is such know- ledge as this useful ? but — What act or conclusion in medical practice is independent of it ? And another question is — How will those earnest anti-vivisectionists, who, like Miss Cobbe, prefer to " die sooner than profit by such foul rites," provide themselves with a medical attendant warranted ignorant of the circulation of the blood ? Very closely connected with the circulation of the blood are the flow of the chyle and lymph in their special capillaries and peculiarly delicate vessels, and the nature of the absorbent system generally. The subject was not at all understood in the time of Harvey, and a hot controversy 60 PHYSIOLOGICAL CRUELTY. was raging as to whether or not the absorption of chyle was the sole business of the mesenteric blood-vessels, when a great Italian anatomist, Gaspardus Asellius, suddenly chanced upon the solution of the whole question. On the 23rd of July, 1662, he was making an experiment upon a dog which had lately had a full meal,* when he observed " a number of very fine white cords," which he at first sup- posed to be nerves, but which, when pierced, proved to contain a milky fluid. The discovery which he had made then burst upon him, and he saw that he had hit upon the conduits by which the chyle was conveyed to the blood But he was not successful in tracing their subsequent course correctly ; and, as he held to the old idea that all nutrient matter was carried to the liver, there to be made into blood, he was easily satisfied that the lacteals which he had dis- covered led to that organ. By a chance precisely similar to that which had revealed the lacteals to Asellius,*!- Jean Pecquet happened — while ex- perimenting for another purpose — to observe the opening of the main absorbent vessel of the thoracic duct, which carries their contents into the blood current. He followed up the clue thus given him, and by repeated experiments succeeded in tracing the general course of the lymphatic system.;|: The numerous experiments of Hunter, Hewson, Cruikshank,. and Magendie, have given us a clear idea of the mechanism by which food is absorbed from the alimentary canal and poured into the blood, and of the wide distribution of these absorbent vessels, and their other functions in collecting; and carrying away the overflow of nutrient fluid from the textures. It is through experiment — and experiment alone * For detailed account in Asellius's own -words, see Appendix D. IF 2. + For detailed account in Pecquet's own words, see Appendix D. IT 2. X For a different account of the matter, see Appendix D. IF 2. THE RELATION OF EXPERIMENT TO PHYSIOLOGY. 61 — that we know the course and uses o£ the lacteals and other absorbent vessels, know that they bring to the blood nourishment from the alimentary tract, as well as some waste products and superfluous fluid from the tissues ; and know, too, that by their means foreign matter can be passed into the system. The method of hypodermic injection of drugs rests upon the knowledge of their presence and efiiciency ; and what a wonderful amount of relief and healing must be counted to that invention alone ! And if the only result of these experiments had been to make it possible for surgeons to use a catgut ligature that can be absorbed, instead of one of silk or other material, which (as a rule) must be removed with pain and risk, after many months of irritating delay, they would have conferred a very great boon upon surgery, and even a greater upon surgical patients. The processes of Respiration were not so soon traced out as those of the two circulations. The ancients believed that the air passed through the lung into the cavity of the chest, thence to pass on into the heart, where it mingled with the blood. This opinion was held in the beginning of the 17th century, and by such men as Harvey, Hales, and Boerhaave. The mistake survived, because their knowledge was taken partly from experimentation upon birds and partly from the examination of bodies after death — with which prac- tical physiology is now enjoined to content herself. But a lung dead and collapsed is as like a lung living and inflated as an empty balloon is like a full one, and the conclusions drawn from the one for the other were proportionately trustworthy. Haller, however, carried out a series of expe- riments which disproved this fallacy. Malpighi's expe- riments showed the vesicular texture of the lungs, and the manner in which the blood was exposed in a network of minute vessels to the air Avhich they contained, and made 62 PHYSIOLOGICAL CRUELTY. the air-cells familiar to physiologists. The nature of the change which took place in the capillaries of the lungs still, however, remained a mystery. Mayow, by acute reasoning, and a most carefully arranged series of experiments (for the most part upon living animals), arrived at conclusions far in advance of his time, when but few of the chemical elements were known. He pronounced atmospheric air to be a compound, containing as one of its elements a body to which he attributed the properties possessed by oxygen, but which he called (on account of its relation to nitric acid) nitro-cerial spirit. This alone it was which made the air useful for combustion and respi- ration. The times, however, were not ripe for the reception of his discoveries, and they were neglected. Later on, in the year 1759, Black showed by experiments the presence of what is now known as carbonic acid in the expired air ; and in 1770 Priestley proved in the same manner the analogy of respiration to combustion, and con- cluded that air in its passage through the lungs lost some of its oxygen. But Lavoisier was the first to give an exact explanation of the chemical changes which occur in the process of breathing ; and this he was enabled to do by his skilful and diligent experimentation. The more important of his principles have been worked out and confirmed by others, also experimentally ; so that we now know even the exact quantities of carbonic acid given off and oxygen used up in respiration. So much for the changes in the inspired air worked by its contact with the blood ; but what change in the blood is effected by the air ? This question also was answered by experiment. The diiference of colour between the blood in the veins and that in the arteries had been noticed from the earliest times ; but the first real light thrown upon the subject emanated from an admirable series of experiments THE EELATION OF EXPERIMENT TO PHYSIOLOGY. 63 made by Lower, who opened the thorax of a living animal, and discovered that the change in colour took place in the capillaries of the lungs. This discovery was not, however, followed up, and it was Priestley whose experiments actually convinced the world that the alteration was due to the purifying of the blood by means of the oxygen of the air. Let us again sum up our debt to experiment. Imagine any doctor trying to treat a consumptive patient on the supposition that the lungs let the air through into the' cavity which contains them ! From such ignorance of facts, and all the consequent blundering in practice, experiment — and experiment alone — has delivered us. Haller thus de- molished the pleural-cavity mistake ; while Malpighi had shown the texture of the lungs, and the manner in which the blood and air were brought into contact, by observing under the microscope the lungs of a living frog ; Mayow learnt the action of oxygen ; Black demonstrated the pre- sence of carbonic acid in expired air ; Priestley proved the loss of oxygen in breathing, inferred the analogy of respira- tion to combustion, and confirmed and explained Lower's discovery that the change of colour in the blood took place in the capillaries of the lungs ; Lavoisier gave a compre- hensive explanation of the whole process ; and later ex- perimenters have ascertained the quantities of each gas subtracted from or added to the air in respiration. This is what experiment has taught us. If all this knowledge about respiration could be wiped out of our minds, and we were left only to what has been learnt by bedside observation, anatomy, and meditation, where would be our improved ventilation, and what efforts should we make to keep a proper amount of cubic space for a number of human beings living clustered together ? Would not the pestilences knoAvn as gaol fever, war typhus, and hospital gangrene be •64 PHYSIOLOGICAL CRUELTY. still raging among our prisoners, our soldiers, and our poor, because we should know no reason why the same air should not be used again and again ? Various theories on the subject of digestion succeeded one another before experiment acquainted us with its true processes. It was at first attributed entirely to the moisture and heat of the stomach, which produced an action called " concoction." Next, it was referred to a process analogous to putrefaction, or believed to be the result only of tritura- tion. The stomach had been supposed in turn to be a forcing-stove, a rotting-place, and a mill ; and we might now have been thinking it a galvanic battery, if experiment had been unlawful some three hundred years ago. Spal- lanzani and Stephens, however, proved by this means the secretion of the gastric juice, and its effects upon different kinds of food. They were the first investigators in this direction, and it would be impossible to name all their successors, — so numerous and so rich in results have been their researches. It must be enough to say that all our present accurate knowledge of the gastric juice, its effect upon proteid food-stuffs, and its inertness for others, as well as the wide-spread activity of the pancreas (the function of which was so utterly unknown to the ancients), we owe to experiment of comparatively recent date. The view of the nervous system held by the ancients was that the brain was a large gland, secreting certain animal spirits, which were distributed by the nerves to the different tissues of the body. " The nerves," says Galen, " like streams from a fountain, convey to the muscles their power from the brain." Experiment had given him a rough but fairly correct idea of the course of this stream of power, especially as conveyed by the spinal cord. He gave public demonstrations on the matter, using young pigs as subjects, that he might not shock the susceptibilities of the audience THE RELATION OF EXPERIMENT TO PHYSIOLOOr. 65 by employing the more human monkeys, which he would him- self have preferred. He showed the effects on the respiratory system and other movements produced by section of the cord in the region of the neck ; and he pointed out the results of section at other points, and in various manners. Considering how much he discovered concerning the spinal cord and its uses, it would seem incomprehensible that for seventeen centuries no important step in advance was taken towards understanding the true constitution of the nervous system ; but then, they were seventeen centuries in which no accurate experiments were made upon this subject. Galen's idea that the nerves were conduits of a fluid termed " vital spirits " held the field for a long time ; but as this vital fluid was difficult of detection, it gradually ceased to be an object of belief, and the more correct idea gained ground — that the nerves transmitted vibrations. In their marvel at the first discovery of electricity, people were disposed to attribute everything to it, and it was then believed to be the source of these vibrations. Indeed, makers of electric bands and stockings still continue to advertise that " Electricity is Life." We are as far as ever from knowing what Life is ; but, in consequence of experi- ments, we now know that nerve-impulse is a chemical change — not an electric current — taking place in the protoplasm of the nerve, and transmitted from one molecule to another along its delicate central strand. As to the functions of the nerves, little progress was made from the days of Galen to those of Sir Charles Bell, Magendie, and Johannes Muller. The great idea of the motor functions of the efferent nerves, so brilliantly struck out by Sir Charles Bell in his few but valuable experi- ments, was worked out, confirmed, and developed by Magendie into a consistent theory of the two classes of nerves with their distinct functions ; and it was chiefly by F 66 PHYSIOLOGICAL CRUELTY. investigating the roots o£ the spinal nerves, in experiments upon frogs, that Johannes Miiller arrived at his accurate conclusions as to the functions of the spinal cord. While the greatest credit is due to Marshall Hall for originality in discovering and persistence in teaching the laws of reflex action which really form the basis of our present knowledge of the uses of the nervous centres. We now know some- thing of the actual constitution of the nerves ; we know their relation to the brain, and the manner in which they bring impulses to and receive them from it ; we are acquainted with their reflex action, and with the powerful influence of the spinal cord ; and in the brain itself we know the situations of the cells and groups of cells which preside over many of our most important organic motions, such as breathing, swallowing, &c. At this point, investi- gation has been arrested in England by the fiat of the Secretary of State. But is it not obvious that without the knowledge already gained by this means, there could be no prospect at all of coping with the increasing nerve- maladies of our time ? It is a knowledge still very incom- plete, but which will continue to advance, if — but only if — experiment is not obliged to stand still. Muscular action was attributed by Galen and his suc- 'cessors to the brain and spinal cord. " This is proved distinctly," he says, " by the fact that if you divide any of the nerves, or the spinal marrow itself, the part above the incision and in continuity with the brain will still retain its powers ; but the part below will be incapable of pro- ducing either sense or motion." Glisson was the first to dissent from this view; he applied the term irritability to a muscle as distinct from its nerve, and seems to have had an idea of reflex action. Haller, however, (who, like Glisson, was an experimenter) explained the matter much more clearly. He taught us that every muscular fibre contracts THE RELATION OF EXPERIMENT TO PHYSIOLOGY. 67 when irritated, and that it is thus distinguished from vegetable fibre, which has no such power. This is the cause of muscular motions after death, for the irritability- remains for a certain time, so that the muscles can be caused to contract. This irritability of the muscular fibre is inde- pendent of the nerves, and cannot be referred to any other power ; its origin is quite unknown to us. Its effects, however, are not ; and they form one of the principal data of surgery. We have now gone in order through six of the j)rincipal branches of physiology, and we have found that in each the most important discoveries have been made by means of •experiment, and that to it we owe the accuracy and certainty of whatever knowledge we possess. It is impossible to lay too much stress upon this point, for it is the stronghold of the case. Those who defend physiological experiment as an absolute necessity to medicine do so — not because this or that drug has been discovered by its means, this or that operation perfected through its practice. They defend it, because without it medicine is based upon ignorance, and every doctor is a charlatan, patching at a wonderful mechanism of which he knows nothing. They defend it, because it is the foundation upon which physiology as a .science stands.* The pseudo-sciences rest upon theorizing, guess-work, and empiricism ; a true science rests upon experiment. If physiology be deprived of this necessary foundation, it will be degraded through no fault of its dis- ciples ; it will not fall to pieces, because that which has been won cannot be taken away, but it will be unable to encroach any further upon the morass of human ignorance, because forbidden to lay a firm footing for its advancing tread. But, after all, interests differ. There are some who do not much care for that morass to be invaded. " Quand on veut dessecher un marais,on ne fait pas voter les grenouilles."-f- * See Appendix C. t Madame Emile de Girardin, f2 68 PHYSIOLOGICAL CKUELTY. CHAPTER YII. THE EELATION OF MEDICINE TO EXPERIMENT. The subject a complicated one — An amputation in old times — An ampu- tation at the present day — Facial nerves — Artificial respiration — Transfusion of blood — Orthopsedic surgery — Internal operations — Chassaignac's e'craseiir — Removal of one kidney — Removal of larynx — " Animal grafting" — Study of the processes of disease — Testing of drugs — Preventive medicine — Other benefits of experiment. The facts given in the preceding chapter form by far the strongest proof of the value of experiment upon living- animals ; because they show the part that it has taken in building up — and therefore the part that it is likely to take in perfecting — the science of physiology, upon which all true medicine is based.* * "Rational therapeutics must grow out of physiological knowledge, as surely as a plant is the outgrowth of its roots. As the remote root- lets are the exact parts which are all-important for the nutrition of the plant, so experiment feeds physiology, and thereby nourishes the art of medical practice. It would appear silly to ask to what rootlet any single fruit or flower on a widely-spreading tree owed its existence or nutrition ; and so it is idle to expect that each, or even any, thera- peutic agent or method of diagnosis should be traced to the definite experimental discoveries that may have led to its adoption or use. As the branches of our medical tree spread wider and wider, and its dia- gnostic flowers and therapeutic fruits become more and more numerous,, we find that its physiological roots go deeper and deeper in search of pabulum, and the experimental rootlets become still further removed from the more obviously useful and prolific part of the plant." — Arris and Gale Lectures, III., Lancet, August 5th, 1882, p. 175. THE RELATIOX OF MEDICINE TO EXPERIMENT. 69 In such an inquiry, it was not very difficult to know when we had found what we were seeking for. Discoverers have usually given clear accounts of what they learnt, and how they learnt it ; and a fact in physiology can be proved, tested, and verified, as thoroughly as one in chemistry. Either the lacteals do or do not empty themselves into the thoracic duct ; either the efferent nerve will convey motor impulses, or it will not. There may be a mistake about such matters, but there can be no uncertainty. When the truth has once been found out, it is not likely to be questioned again; and so it is comparatively easy to reckon up the debt ■of physiology to experiment. The matter is not at all so simple when we come to practical medicine. Here, experiment is only one out of many factors Avhich have combined to produce a certain result ; and if any one chooses to believe that the result would have been produced equally well without experiment, it is impossible to convince him. The fact remains, that it was attained luith it. It is true that in physiological dis- coveries also, other processes are used besides experimen- tation ; but it is comparatively easy to assign to each its distinct share. But when the facts thus gained come to be used for the actual practical treatment of sick and suffering human beings, no two of whom are exactly alike, they have to be so cautiously applied, one deduction has to be so qualified by another, individual peculiarities have to be .■so carefully studied and allowed for, with the constant possibility of some unkno^^m disturbing cause upsetting all calculations, that when success has been attained, it is very hard to say to what it has been due. It would not be .strange, therefore, if nothing positive could be said under this heading about experiments on living animals, except that whatever increased physiological knowledge must improve medical practice. If this were all, it would not be 70 PHYSIOLOGICAL CRUELTY. a confessicM of defeat. Suppose that no astronomer were- to be allowed to use a sextant, until he could quote some discovery made by its means alone ; or that all thermo- ' meters were to be banished from laboratories, unless it could be shown that whatever we know about heat had been learnt from thermometers and nothing else ! So with experiment in medicine. It is not the sole instrument of discovery, nor perhaps the most important ; but it is an extremely useful instrument,* and in its own place indis- pensable. Much of its work cannot be disentangled from the general results, and put down to its separate account, but we are not altogether unable to trace its. action, and we shall now see what advances in practical medicine can be distinctly ascribed to it. At every step in an important surgical operation, we are reminded of the discoveries catalogued in the last chapter, and of others flowing out of them.-]- Perhaps it will be well to quote Ambrose Pare's description of operations in his time,, in order to help us to appreciate our privileges^ " I observed my masters, whose method I intended tO' follow, who thought themselves singularly well appointed to stanch a flux of blood, when they were furnished with various store of hot irons and caustic medicines, which they would use to the dismembered part, now one, then another,, as they themselves thought meet. Which thing cannot be- spoken or but thought upon without great horror, much less acted. For this kind of remedy could not but bring great and tormenting pain to the patient, seeing such fresh wounds made in the quick and sound flesh are endured with exquisite sense. . . . And verily, of such as were * See resolutions of the Medical Congress, held in London in 1881, and of the British Medical Association of same year. Appendix C. , m IT 4 and 7. t For answers to objections to this line of argument, see Appendix E.,ir2, a. THE RELATION OF MEDICINE TO EXPERIMENT. 71 burnt, the third part scarce ever recovered, and that with much ado, for that combust wounds with difficulty come to cicatrization ; for by this burning are caused cruel pains, whence a fever, convulsion, and oft-times other accidents worse than these. Add hereunto, that when the eschar (scale) fell away, oft-times a new heemorrhage ensued, for stanching whereof they were forced to use other caustic and burning instruments Through which occasion the bones were laid bare, whence- many were forced, for the remainder of their wretched life, to carry about an ulcer ujDon that part which was dismembered ; which also took away the opportunity of fitting or putting to an artificial leg or arm, instead of that which was taken off." Compare with this hideous description the processes of a. modern amputation. The patient is probably made uncon-; scious by chloroform, which was studied by Simpson in experiments upon the lower animals* as well as on himself and other men. Some other anaesthetic may, however, be used ; or, perhaps, some peculiarity in the patient's consti- tution may make it dangerous to render him insensible. In this case pain may be saved by the sub-cutaneous injection of morphia,f studied by Dr. Alexander Wood and the late Mr. Rynd (of Dublin) upon sporting dogs, and by a com- mittee of the Medical and Chirurgical Society;]: upon other animals. The next step is to empty the limb of' blood. Experiment has shown that the blood-vessels have^^ a power of contracting ; and they do contract when the pressure is reduced from any cause, such as raising the * Eeport of Royal Commission, p. xiii. + " Sub-cutaneous injection was used in the laboratory for years before it was applied in practice." — Memorandum of Facts, d-c, pub- lished by the Association for the Advancement of Medicine by Re- search, p. 11. X Medico-Chirurgical Transactions, vol. 51, p. 199. 72 PHYSIOLOGICAL CRUELTY. limb. The surgeon, therefore, holds it up for a time, and it becomes comparatively bloodless. Experiments made by Brown-S^quard and others having taught him how long the tissues can be left completely deprived of blood without risk of mortification, he next ventures to apply Esmarch's elastic bandage, and almost completely empties the limb of the vital fluid. The cutting being accomplished, the injured arteries are firmly tied before any bleeding occurs, in a fashion which is the result of long discussions and many experiments.* Although the ligature itself is of very old date (definite accounts of it being found in the writings of the Arabians of the tenth and twelfth centuries), yet the right manner of applying it was only arrived at by slow degrees. Up to the beginning of the last century, the nerves used commonly to be tied in, together with the vessels, causing frightful sufifering, and frequent death from tetanus. Going, then, into the other extreme, the ligatures used were wide, and they were loosely tied over corks, &c., so as not to injure the coats of the artery ; but they failed to stop the bleeding. The experiments of Dr. John Thomson, of Edinburgh, and of Dr. Jones, who followed him, proved that the best method was to tie the artery extremely tightly, which caused the blood within to coagulate, and deposit a clot of solid matter that acted as a stopper to close the opening. As the operator is familiar with the action of the absorbent vessels (dis- covered by experiment, as related in Chap. YI.), he will use a catgut ligature, which will not need to be pulled away when the wound is healing,-|- but can be left where it is to * See Appendix E., IT 2. e. + It is difficult for any one without experience to realize the annoy- ance of the old ligatures. Imagine three or four different strings hanging out of one wound for months, sometimes for years, as occurred in the case of Lord Nelson ! THE RELATION OF MEDICINE TO EXPERIMENT. 73 'be gradually absorbed. And adopting Professor Lister's aseptic mode of treatment (chiefly based upon experiment), his ligature — as well as the dressings which he will sub- sequently use — will be carbolized.* The amputation itself takes place, perhaps without the shedding of a drop of blood, certainly without the least dano-er of hsemorrhao-e. Deaths from this cause — once the surgeon's terror — are now almost unheard of. The wound (kept perfectly clean, and free from all causes of irritation) heals naturally and healthily, with very little pain, — if the ^aseptic method be employed, with none. There is no fever, no formation of matter, no fear of bleeding coming on from the ends of the cut vessels ; and the restorative forces of Nature have full play. " Look on that picture and on this," and remember that at every step experiment has been the guide from worse to better. The brilliant discovery of Lister was led up to by the experimental researches into wound-fever carried on by Lee, Bennett, Pasteur, Colin, Toussaint, M^eber, Breuer and Chroback, and Koch. They investigated and experimented, finding out gradually what the fever was not, and what did not cause it ; then what it was, and what did cause it ; and thus they prepared the field for the original genius that struck out the method of prevention. And if any be inclined to object that hundreds of animals were sacrificed in the process of discovery, let him think of the thousands of men who have been sacrificed for want of it, and who would in all future ao;es — as long; as man is liable to disease or injury, and particularly so long as war lasts — have died miserably in festering hospitals of all the horrible varieties of simple or secondary wound-fever, and the other consequences of wound-infection. The perfecting of this mode of treatment has now been forbidden by the * See Appendix, E., H 2, 7. 74 PHYSIOLOGICAL CKUELTY. Home Secretaiy ; but enough had been done before the reign of " Zoophilism " in England to secure a great saving in human life, and the good work is being carried on in other countries. Until within the present century, surgeons used to divide one of the nerves of the face (the portio dura of the seventh pair), in hopes of curing neuralgia. But as the nerve had nothing whatever to do with sensation, the only result was to destroy motion in that side of the face. The experiments which revealed the true functions of the nerve, at last put an end to this piece of stupidity. This same nerve often loses its power of action from one of many various causes affecting different portions of it ; and the treatment must be different according to the part affected. This can only be discovered from indications, the meaning of which has been learnt from vivisections, in combination, of course, with anatomy. If a man has fallen into the water, and become insensible before he is taken out, — or fallen down an old well, or in any other way has had his blood poisoned with carbonic acid gas (which we call being suffocated), the best means to restore him is artificial respiration. But here we are again indebted to experiment on living animals ; for this method was used upon them by Vesalius, Hooke, Lower, and others, long before it was applied to the resuscitation of human beings. Suppose, however, that he has been suffocated by the fumes of charcoal ; if the mischief has gone far, artificial respiration will not bring him round. We may go on trying it until all hope is lost, if we do not know what Claude Bernard's experiments have proved, — that the car- bonic oxide gas given off by burning charcoal makes a more stable compound with the colouring matter of the blood, which prevents it henceforward from uniting with oxygen. THE RELATION OF MEDICINE TO EXPERIMENT. 7o- So that it is useless to pump in supplies of fresh air ; the only thing to be done is to get rid at once of the spoiled blood, and replace it with new. This can be done by trans- fusion, or injecting enough blood from a healthy person to keep the system alive until it can produce more for itself.. In the same way, when life is all but lost from hgemorrhage, it can be recalled by a fresh supply of the vital fluid. It is only from repeated and careful experiments that surgeons have learnt how to perform this operation with success. It is never done except as a last resource, when everything else has failed ; and so far has saved more than half the cases in which it has been attempted.* Great improvements in orthopaedic surgery are due to the physiological investigations of Stromeyer, Von Ammon, Bouvier, Guerin, and others, in the present century. Tenotomy (or the surgery of tendons) has only been carried on in a scientific manner and with successful results since the subcutaneous method of performing the operation was perfected, and the repair of tendons investigated on. the lower animals by the same experimenters.-j- The possibility of operating with the knife upon the stomach and intestines was only proved by experiments, upon animals, especially by the easy establishment of gastric fistulse in doo-s. In the same manner, the methods of operation were studied ; and, consequently, diseases- which were formerly considered hopeless are now brought' within reach of amelioration or cure.:|: It sometimes happens that tumours are situated either where they cannot be reached by the knife, or where the haemorrhage when they are removed cannot be arrested. In such a case, nothing could be done for the patient until the invention of M. Chassaignac's ecraseuv, an instrument. * See Appendix E., IT 2, t. t See Appendix E., U 2, -q. X Heidenhain, loc. cit., p. 37. 76 PHYSIOLOGICAL CRUELTY. which slowly tears through the tissue instead of cutting it. In this way, there is almost no bleeding, and the operation -can be performed with safety. It was necessary, however, that he should test his instrument before using it on human beings ; and he satisfied himself of its value and safety by experiments upon dogs, instead of upon hospital patients. No one would have supposed that a creature could live in perfect health with only one kidney, when Nature has supplied it with two, until the fact had been proved upon dogs. This knowledge has emboldened surgeons to attempt the operation of removal in human cases ; it has now frequently been performed, and repeatedly been successful, where all other means of prolonging life or making it bearable had failed. Billroth, the celebrated Vienna surgeon, had a patient who was threatened with sudden death from malignant •disease of the larynx. The only hope that he could see lay in removing the entire organ ; but the operation had never been performed before, and he could not venture to attempt it for the first time upon a man. His assistant, Czerny, however, performed it successfully, upon several dogs ; and by using his experience, Billroth was able to save his patient's life. The man recovered, and with an artificial larynx was able to breathe, and even to speak in a whisper.* In some very bad cases of injury to the skin, especially from extensive burns or scalds, when it has been completely