Kf* '-**!! 'y^:#;-^yyi^' W ■ "■* A ■■*v.^ ^k* Comeri University Library arWg814 Galen and Paracelsus / ,. 3 1924 031 430 717 olin.anx wv/ » . / Cornell University Library The original of this book is in the Cornell University Library. There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31924031430717 GALEN AND PARACELSUS. BY J. C. DALTON, M. D., PEOrZSSOR OF PHTSIOLOeX Iir THE OOLLBOE OT PHTSICIANS AOT) SUBOEONS. \BBPBmTEB FROM TEE N. T. MEDICAL JOURNAL, MAT, 1873.] NEW TOEK: D. APPLETON AND COMPANY*, 549 & 551 BROADWAY. 18V3. GALEIsT AND PAEACELSUS.' Me. PsEsroENT and Gentlemen: As the agreeable duty has been assigned to me of offering to the Academy a paper this evening, I will venture to ask your attention, in the interval of more important business, to a brief sketch of two historical personages who may be considered as representing, each in his different way, two of the most remarkable phases of medical character. These two persons are Galen and Paracelsus. Galen was born early in the second century of the Christian era, at the city of Pergamus, near the western coast of Asia Minor, opposite the ^gean Archipelago... He^waff Greek by desert as well as by birth, the son of U ikon,-an architect, who was a man of good fortune, and accomplished in his profes- sion^ - Galen himself received a liberal education in the vari- ous bran ches^f knowledge cultivated at,tlie„time. He studied medicine jmder several masterSj and afterward resorted to Alexandria in Egypt, then the great centre of medical science, ' Read before tlie New York Academy of Medicine, Maroli 20, 1873. 4 GALEN AND PAEACELSUS. where lie devoted himself more-especiallj-toaii atomy. After >ompleting his studies, he at first practised for a few years ^with credit in his native city of Pergamus ; but afterward ^ took up his residence in Eome, where the greater part of his professionaLhfe was-^ent, and. where he took the mosTpromi- hent rank among. the physicians of the time. He was there- \for£L&r many yeai'S the most ^celehrate'd 'physician in the first city of the world. He. was the representative man in the' "Medical profession of his day^-and he left an impress -upon medical science and art which lasted for more than a thou- sand years. It is not always easy to appreciate fully the intellectual calibre of men who lived in what we call the time of the an- cients. We are separated from the ancient civilization and culture, by the dismal interval of the middle ages ; and some of the links which would connect us with them are, no doubt, irrecoverably lost. Besides, as we have now accumulated so much more actual knowledge than they possessed, we are sometimes apt to think of the ancients as children in sciedce, and out of the range, in this respect, of a comparison with our- selves. We should not commit such a mistake, if we remem- bered that the intellectual capacity of a people is not to be measured by what they know, but by what they have discov- ered ; not by the knowledge which they have received from their predecessors, but by that which they have created and handed down to their posterity. Judged by this standard, the physicians of the ancient time were at least fully the equals of the moderns ; and it would be difficult to find, in any period of the world, a man more remarkable than Galen for aU the essential qualities of professional and scientific preeminence. J One of his most striking traits was the respect which he ^entertained for his predecessors in medical discovery. Hippoc- ' rates tvas his admiration and his model, and he followed his Lprecepts and ideas more closely than those of any previous Aaacher. But this_wasnpt„a_jenilS--^'^4^8rrfiii_admiration. He believed that the highest tribute he could pay^tcTsuch a master would be in carrying out and developing his method, so as to increase the knowledge already attained. GALEN AND PAEACELSUS. 6 y " There are many^pEyiicians,"~Fre says, " like the athletes, ^ who would like to win prizes in the Olympic games, and yet ■will not take the:^£^SsIjiiecessaryTo gain- them. For they are loud in their praises of Hippocrates, and place him in the ^ highest rank among physicians ; yet never think of imitating litm themselves/"/ . ."iTiff-eertaialy no small advantage on our side to live at the present day, and" to have received from our ancestors the arts already brought to such a degree of per- fection ; and it would seem an easy thing for us, after learn- ing in a short time every thing that Hippocrates discovered hy many years of labor, to employ the rest of our lives in in- vestigating what still remains unknown." ' Galen was devotedly fond of anatomy, and insisted upon . it, in opposition to some of the medical sects of the time, as an indispensable basis for rational medicine. He constantly expresses his admiration for the manner in which all parts of the body are adapted to their functions ; and even the study of the articulations, and the form of the bones and their at- tachments, have .an unceasing attraction for him. " In my view," he says, " there is nothing in the body useless or inac- tive ; but all parts are arranged to perform their offices to- gether, and have been endowed by the Creator with specific powers." " His ideas in physiology were thoroughly scientific, and entitled to the highest consideration in the history of the subject. Of course it was impossible for him to master the physiological details to be learned from chemistry, which ■^yas then unknown, nor by the microscope, which had not been invented. But in every part of the subject which was acces- sible by the means at his disposal, his views will bear the closest criticism ; and, in every thing connected with his own personal acquirements, his superiority is beyond question. He was an enterprising and judicious investigator, and an industrious and successful teacher. Hejwa&_th£-fc6#-great experimental physiologist — as no one, before his timCj^so far as we^carTIeamph^Sit'ually 'resbrtfi3t~ to experiments uponjjii- mals, as a means of discovery in physiology. Grjlen jooJumly ' " Galen, Quod optimus Medious et quoque Philosophus." = " De Usu Partium," iv., 2. 6 aALEK AND PAEACELSUS. did this, but also frequently illustrated his points by public demonstrations. The result of this was a large accumulation of physiological facts, many of them of the highest value ; ^nd it is a mpst curious 'thiflg'to see how, in the subsequent periods of European history for many hundred years, not only was there no one to-rival or even to continue his discoveries, but the profession was not able even to retain them ; so 'that some of the most important, though expressly contained in his writings, were practically forgotten, and had to be discovered over again, centuries afterward. ^ Perhaps the single discovery for which he is better known \than for any other is-iha t of t be-^trTie"fTtBetieB--e^the^rteries as vessels^Bontaining blood. In Galen's time and for several centuries before," it was the prevalent opinion that in respira- tion a vital air or gas penetrated into the pulmonary veins from the lungs, was carried to the left ventricle of the heart, and thence distributed all over the body by the arteries. This vital air or " spirits," derived from the atmosphere, was what called into play the organic forces of the system, and thus «in§,iB,tained the life of the animal frame. Y But Galen did not believe that the air penetrated as a mass |into the heart and arteries. He considered that it was rather a quality than the substance of the air, which entered the blood in the lungs, and thus communicated to it an element of vitality ; so that what circulated in the arteries, according to him, was not air or " spirits," as formerly believed, but arte- rial blood) vivified and animated by the qualities which it had absorbed from tile air in the lungs. He based this opinion on the positive phenomenon that, although when the arteries are opened in the dead body they appear empty, yet, if openeS during life, it is blood that escapes from -them and not air. This was so palpable a fact, that the older observei-s could not help knowing it; but they explained it by saying, that when an artery is opened- during life, it first empties itself of the air which it contained, and then blood passes into it by-transfusion from distant parts. Galen declared that this- explanation was untenable. " For if ' Since the time of Praxagoras of Cos (b. o. 250), wlio first made the distinction by nauie between arteries and veins. GALESr AND PAEAOELSFS. 7 you prick an artery," he says, " even with the finest needle, blood escapes from it at the very first. Now, it seems to me that, though the air supposed to be contained in the arteries might escape instantly from a large wound, yet that it would require considerable time to be expelled from one of -moderate size, and therefore could not help becoming percep- tible to the senses. It is said that blood is not discharged from the vessel until aU the air has escaped, and that the transfusion of blood begins from the remoter vessels. But this involves two improbabilities : first, that all the air in the arterial system should be so quickly discharged through a mere needle-puncture as to escape detection ; and, secondly, that the animal should continue to live after losing all the vital air in his arteries." ' But though Galen went through with all these arguments in discussing the question, his own convictions evidently rested upon the results of direct experiment. He exposed a large artery in the living animal. Now, if the vessel, on being opened, gave exit to blood, this blood must either have been contained in it beforehand, or must have passed into it from elsewhere. To test this point, he first included a por- tion of the vessel between two ligatures, and so shut off all communication with other parts. Then by opening it be- tween the ligatures he showed that in reality it contained blood and not air. From that time the existence of arterial and venous blood, in two sets of blood-vessels, th« veins and the arteries, was a permanently-established fact. There are other points in regard to the cftculation which he treated in an equally successful manner, such as the action of the pulmonary and aortic valves, and the movements of the heart in pulsation. One of his most reparkable observations relates ta