These two cases, however, do not give us a just comprehension of Galen’s abilities at their best. In his medical practice he could be as quick and comprehensive an observer and as shrewd in drawing inferences from what he observed as the famous Sherlock Holmes, so that some of his slower-witted contemporaries accused him of possessing the gift of divination. His immediate diagnosis of the case of the Sicilian physician by noting as he entered the house the excrements in a vessel which a servant was carrying out to the dungheap, and as he entered the sick-room a medicine set on the window-sill which the patient-physician had been preparing for himself, amazed the patient and the philosopher Glaucon[627] more than, let us hope in this case in view of his profession, they would have amazed the estimable Dr. Watson.
His happy guesses.
Puschmann has pointed out that Galen employs certain expressions which seem happy guesses at later discoveries. He writes: “Galen was supported in his researches by an extremely happy imaginative faculty which put the proper word in his mouth even in cases where he could not possibly arrive at a full understanding of the matter,—where he could only conjecture the truth. When, for instance, he declares that sound is carried ‘like a wave’ (Kühn, III, 644), or expresses the conjecture that the constituent of the atmosphere which is important for breathing also acts by burning (IV, 687), he expresses thoughts which startle us, for it was only possible nearly two thousand years later to understand their full significance.”[628]
Tendency towards scientific measurement.
Galen was keenly alive to the need of exactness in weights and measurements. He often criticizes past writers for not stating precisely what ailment the medicament recommended is good for, and in what proportions the ingredients are to be mixed. He also frequently complains because they do not specify whether they are using the Greek or Roman system of weights, or the Attic, Alexandrine, or Ephesian variety of a certain measure.[629] Moreover, he saw the desirability of more accurate means of measuring the passage of time.[630] When he states that even some illustrious physicians of his acquaintance mistake the speed of the pulse and are unable to tell whether it is slow, fast, or normal, we begin to realize something of the difficulties under which medical practice and any sort of experimentation labored before watches were invented, and how much depended upon the accuracy of human machinery and judgment. Yet Galen estimates that the chief progress made in medical prognostication since Hippocrates is the gradual development of the art of inferring from the pulse.[631] Galen tried to improve the time-pieces in use in his age. He states that in any city the inhabitants want to know the time of day accurately, not merely conjecturally; and he gives directions how to divide the day into twelve hours by a combination of a sun-dial and a clepsydra, and how on the water clock to mark the duration of the longest, shortest, and equinoctial days of the year.[632]
Psychological tests with the pulse.
Delicate and difficult as was the task of measuring the pulse in Galen’s time, he was clever enough to anticipate by seventeen centuries some of the tests which modern psychologists have urged should be applied in criminal trials. He detected the fact that a female patient was not ill but in love by the quickening of her pulse when someone came in from the theater and announced that he had just seen Pylades dance. When she came again the next day, Galen had purposely arranged that someone should enter and say that he had seen Morphus dancing. This and a similar test on the third day produced no perceptible quickening in the woman’s pulse. But it bounded again when on the fourth day Pylades’ name was again spoken. After recounting another analogous incident where he had been able to read the patient’s mind, Galen asks why former physicians have never availed themselves of these methods. He thinks that they must have had no conception of how the bodily health in general and the pulse in particular can be affected by the “psyche’s” suffering.[633] We might then call Galen the first experimental psychologist as well as the first to elaborate the physiology of the nervous system.
Galen’s anatomy and physiology.
It would scarcely be fair to discuss Galen’s science at all without saying something of his remarkable work in anatomy and physiology. Daremberg went so far as to hold that all there is good or bad in his writings comes from good or bad physiology, and regarded his discussion of the bones and muscles as especially good.[634] He is generally considered the greatest anatomist of antiquity, but it is barely possible that he may have owed more to predecessors and contemporaries and less to personal research than is apparent from his own writings, which are the most complete anatomical treatises that have reached us from antiquity. Herophilus, for example, who was born at Chalcedon in the closing fourth century B. C. and flourished at Alexandria under the first Ptolemy, discovered the nerves and distinguished them from the sinews, and thought the brain the center of the nervous system, so that it is perhaps questionable whether Payne is justified in calling Galen “the founder of the physiology of the nervous system,” and in declaring that “in physiological diagnosis he stands alone among the ancients.”[635] However, if Galen owed something to Herophilus, we owe much of our knowledge of the earlier physiologist to Galen.[636]
Experiments in dissection.