Astrology is the typical example of pseudo-science in medicine. The stars, and particularly the planets and the moon, were supposed to have great influence on human destiny, human health, and human constitutions. Astrology was an organized body of knowledge over 3,000 years ago. Mr. Campbell Thompson has recently translated a series of 300 inscriptions from the cuneiform tablets in the British Museum, and Professor SÜdhoff of Leipzig has compiled all the references to medicine in these. The latter's studies show the extent which star influence was supposed to have over human health. A halo round the moon, an obscuration of the constellation of Cancer, the pallor of a planet in opposition to the moon, the conjunction of Mars and Jupiter, and other movements and phenomena of heavenly bodies were supposed to foretell the approach of disease for man and beast.

As a consequence of this application of astrological knowledge to medicine, operations were performed only on certain favorable days or under favorable conjunctions of planets. An ailment that occurred at an unfavorable time, because of an unpropitious state of the heavens, would not be relieved until the motions of the stars brought a more benign conjunction. Observations seemed clearly to indicate that the stars actually had such influences. Even Hippocrates, though he insisted that "the medical art requires no basis of vain presumption, such as the existence of distant and doubtful factors, the {39} discussion of which, if it should be attempted, necessitates a hypothetic science of supra-terrestrial of subterrestrial belief," could not entirely get away from astrology. In his treatise on "Air, Water and Locality" he writes: "Attention must be paid to the rise of the stars, especially to that of Sirus as well as the rise of Arcturus, and after these to the setting of the Pleiades, for most diseases in which crises occur develop during these periods." In the second chapter he writes: "If anyone would be of the opinion that these questions belong solely in the realm of astrology, he will soon change his opinion as he learns that astrology is not of slight, but of very essential importance in medical art." (Personally I doubt the Hippocratean authorship of these passages, but they are surely very old.)

The influence of the suggestions derived from astrology on human patients continued until almost the nineteenth century. There were many protests, especially from the Doctors of the Church, that the applications of astrology to medicine were false, but the practice continued. Both Kepler and Galileo drew horoscopes for patrons, and while Kepler doubted their value, he felt that in making them he was justified by custom. Galileo drew up the horoscope of the Grand Duke of Tuscany during an illness, and declared that the stars foretold a long life, but the Duke died two weeks later. But incidents of this kind did not disturb either popular faith or medical confidence in astrology as helpful, in prognosis, at least, if not also in diagnosis. Even so late as 1766 Mesmer was graduated at the University of Vienna, when it was doing the best medical work in Europe, with a thesis on "The Influence of the Stars on Human Constitutions."

Later Astrology.—Few now realize that the curious figure printed at the beginning of most of our almanacs down to the present day is a relic of the time when physicians believed in the influence of the constellations over the various portions of the body. Even yet this idea has not entirely gone out of the popular mind, and hence its retention as something more than a symbol in our little weather books. Man was considered as a little world, a microcosm, and the universe, as men knew it—the sun, the moon and the planets together—constituted a macrocosm. It was observed that the bodies constituting the universe were circumscribed in their movements and never went out of a particular zone in the heavens which was called the zodiac. This zodiac was divided into twelve equal parts called signs or constellations. Similarly man's body was divided into twelve parts, of which each one was governed by a sign of the zodiac or by the corresponding constellation. The ram governed the head; the bull the neck; the twins the paired portions, shoulders, arms and hands; the crab the chest; the lion the stomach, and so on. The old surgical rule, as quoted by Nicaise in his edition of Guy de Chauliac's "Grande Chururgie," was that the surgeon ought not make an incision, or even a cauterization, of a part of the body governed by a particular sign or constellation on the day when the moon was in that particular portion of the heavens, for the moon was supposed to be the bringer of ill-luck and to have untoward influences. The incision should not be made at these unfavorable periods for fear of too great effusion of blood which might then ensue. Neither should an incision be made when the sun was in the constellation governing a particular member, because of the danger and peril that might be occasioned thereby.{40}

Such rules were supposed to be founded on observation. Patients were influenced by them mainly because they were assured that the surgical treatment was undertaken under the most favorable influence of the stars and that all unfavorable influences had been carefully observed and eliminated. It is hard for us to understand how such ideas could have been maintained for so long in the minds of men whose other attainments clearly show how thorough they were in observing and how profoundly intelligent in reaching conclusions. We should, however, have very little censure for them, since from some other standpoint we find every generation, down to and including our own, jumping at conclusions just as absurd and just as inconsequential. And the practice of astrology was not without its value, for the reassurance given patients by the consciousness that the stars were favorable did much to relieve their anxiety as to the consequences of surgery, lessened shocks, hastened convalescence, and favored recovery.