enthusiasm for philosophical study, the pursuit of which led him to visit Egypt, Phœnicia, Chaldea, and perhaps also India. He was imbued with Eastern mysticism, and held that the air is full of spiritual beings who send dreams to men, and health or disease to mankind and to the lower animals. He did not remain long in Greece, but travelled much, and settled for a considerable time in Crotona, in the South of Italy, where he taught pupils, their course of study extending over five or six years. The Pythagorean Society founded by him did much good at first, but its members ultimately became greedy of gain and dishonest, and the Society in the lifetime of its founder was subjected to persecution and dispersed by angry mobs. Pythagoras possessed a prodigious mind. He is best known for his teaching in reference to the transmigration of souls, but he was also a great mathematician and astronomer. He taught that "number is the essence of everything," and his philosophy recognized that the universe is governed by law. God he represented by the figure 1, matter by the figure 2, and the universe by the combination 12, all of which, though fanciful, was an improvement upon mythology, and a recognition of system.

In the practice of medicine he promoted health mainly by diet and gymnastics, advised music for depression of spirits, and had in use various vegetable drugs. He introduced oxymel of squills from Egypt into Greece, and was a strong believer in the medicinal properties of onions. He viewed surgery with disfavour, and used only salves and poultices. The Asclepiades treated patients in the temples, but the Pythagoreans visited from house to house, and from city to city, and were known as the ambulant or periodic physicians.

Herodotus gives an account of another eminent physician of Crotona, Democedes by name, who succeeded Pythagoras. At this time, it is recorded that the various cities had public medical officers. Democedes gained his freedom from slavery as a reward for curing the wife of Darius of an abscess in the breast.

The dispersal of the Pythagoreans led to the settlement of many of them, and of their imitators, in Rome and various parts of Italy. Although Pythagoras was a philosopher, he belongs to the Mystic Period, while Hippocrates is the great central figure of the Philosophic Period. Before studying the work of Hippocrates, it is necessary to consider the distinguishing features of the various schools of Greek philosophy. Renouard shows that the principles of the various schools of medical belief depended upon the three great Greek schools of Cosmogony.

Pythagoras believed in a Supreme Ruler of the Universe, and that spirits animated all life, and existed even in minerals; he also believed in preconceived purpose. With these views were associated the Dogmatic School of Medicine, and the name of Hippocrates, and this belief corresponds to modern vitalism.

Leucippus and Democritus, rejecting theology, considered vital action secondary to the operation of the laws of matter, and believed that atoms moved through pores in the body in such a way as to determine a state of health or disease. With this philosophy was associated the Medical School of Methodism, a system said to have been founded by Asclepiades of Prusa (who lived in Rome in the first century before Christ), and by his pupil Themison (B.C. 50). The third school of medical thought, that of Empiricism, taught that experience was the only teacher, and that it was idle to speculate upon remote causes. The Empirics based these views upon the teaching of philosophers known as Sceptics or Zetetics, followers of Parmenides and Pyrrho, who taught that it was useless to fatigue the mind in endeavouring to comprehend what is beyond its range. They were the precursors of modern agnosticism.

The Eclectics, in a later age, formed another medical sect, and had no definite system except that they made a selection of the views and methods of Dogmatists, Methodists and Empirics.

The Greek philosophers as a class believed in a primary form of matter out of which elements were formed, and the view held in regard to the elements is expressed in Ovid's "Metamorphoses."[4]