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He divided medical science into three great sections,—physiology, pathology, and therapeutics. In his explanations of disease he was too often fanciful, following the speculations mainly of Galen, and making free use of the hypotheses of humors, temperaments, vital spirits, etc.; but the following statement of his would do credit to a trained pathologist of to-day: "As for myself, I shall never believe I have profound knowledge of any affection if I do not know positively, just as if I could see it with my eyes, in what part of the human body is the disease, its primitive seat, what suspicion of organic lesions constitute it, whence it proceeded, if it exists idiopathically or by sympathy, or if it be kept up by some exterior cause. He who pretends to be a rational physician must sound each of these subjects, and discern them by certain signs." The problem which he thus set himself he certainly, for his own part, considered as solved, although it was not long before his solutions were set aside and the original uncertainty reappeared.
In therapeutics he very early laid down the fundamental maxim that every disease must be combated by contrary remedies, justifying this by every species of argument, amounting to this: that every disease must be combated by its contrary because all that cures a disease is contrary to it. This was, in part, the doctrine of "Contraria contrariis curantur"—the antithesis of the equally absurd sophism: "Similia similibus curantur" which three hundred years later was erected into an excuse for the foundation of an alleged new school. There can be no doubt that Fernel rendered very great service to his time and to subsequent generations, despite the fact that his recommendations and statements were too often founded upon sophistry.
Just here we must digress for a moment to consider the status of bleeding. Hippocrates and Galen had advised to bleed largely from the arm on the affected side in pleurisy and pneumonia. That practice was gradually abandoned as Greek traditions were lost sight of, and finally the Arabs substituted for it something entirely different,—namely, pricking a vein in the foot in order to let blood flow drop by drop. Their method prevailed throughout Europe until the commencement of the sixteenth century, or about the time when Fernel appeared upon the scene. A Parisian physician named Brissot had revived the ancient (the Greek) practice during an epidemic of pleurisy, and had obtained thereby astonishing success, which he hastened to publish, commending the method employed. He thus created a great uproar in the medical world. The innovation found foes and defenders, and disputes grew warm, even to the fever point. Finally, the ancient method was generally revived, and Fernel accepted it.
Felix Plater was born in 1536, in Basel, Switzerland, and died in 1614. He had several sons who made their mark in medicine. In his large work, which preceded that of Fernel, he took perhaps the first step in an unexplored route,—namely, in the classification of disease according to the totality of apparent symptoms. Defective as this classification appears in our eyes, its author lived a long life as a very distinguished practitioner and professor in his native town.
Giovanni Batista Porta was born in Naples in 1536, traveled extensively in Italy, France, and Spain, and founded in 1560 an Academy of the Segreti. He was accused of magic, and was compelled to refute the charges in Rome. He died in 1615, having been one of the leading scientists of his time, and the founder of modern optics. In the first edition of his Magia Naturalis, published in Naples, 1587, is found the first description of the camera obscura,—of course, in a very incomplete form and without lenses.
Severino was a celebrated surgeon of Naples. He was born in 1580, in Calabria, studied in Naples, became a doctor in Salernum, and then became professor of anatomy in his native town. For a long time the victim of intrigue and of persecution by the Inquisition, he was finally driven out of Naples, but was called back by the populace. He then became the most celebrated teacher of his time, writing extensively on a variety of subjects. He died in 1656 of the plague, an epidemic of which was at that time raging in central Italy.
Arriving now at the surgery of this Age, we find that matters were more chaotic than in other departments of medicine, and for reasons which are easily given and appreciated. While, ordinarily, external diseases are more easily discerned than internal, and while in a corresponding degree they can be more satisfactorily treated; while, in other words, external pathology has ordinarily taken precedence of internal in professional as in lay minds, this view seems to have been inverted for a time during the Middle Ages. Previous to the period now under discussion the sciences had generally declined in Europe, and surgery had fallen even lower than medicine, for the reason that medicine was in the hands of the priests, who had at that time something of a liberal education, while the practice of surgery was abandoned to a class of ignorant barbers, bathers, and bone-setters. No mechanic or artisan could take as an apprentice any youth without a certificate affirming his legitimate birth, and that he came from a family in which there were neither barbers, bath-keepers, shepherds, nor butchers. Among the men who were thus made social outcasts were those into whose hands most of the surgery of the fifteenth century fell. This was particularly the case in Germany, and other European countries were little in advance. We have seen that in France and in Italy Lanfranc and Guy de Chauliac did their best to rescue surgery from the hands of these men, but their efforts did not prevent it from being completely abandoned by the clergy, who devoted themselves to the practice of medicine.