Book 1
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During the same times the Art of Medicine was divided into three parts: one being that which cures through diet, another through medicaments, and the third by hand. The Greeks termed the first Διαιτητικήν, the second Φαρμακευτικήν, the third Χειρουργίαν. But of that part which cured diseases by diet those who were by far the most famous authorities, endeavouring to go more deeply into things, claimed for themselves also a knowledge of nature, without which it seemed that the Art of Medicine would be stunted and weak. After them first of all Serapion, declaring that this kind of reasoning method was in no way pertinent to Medicine, based it only upon practice and upon experience. To him followed Apollonius and Glaucias, and somewhat later Heraclides of Tarentum, and other men of no small note, who in accordance with what they professed called themselves Empirici (or Experimentalists). Thus this Art of Medicine which treats by diet was also divided into two parts, some claiming an Art based upon speculation, others on practice alone. But after those mentioned above no one troubled about anything except what tradition had handed down to him until Asclepiades changed in large measure the way of curing. Of his successors, Themison, late in life, diverged from Asclepiades in some respects. And it is through these men in particular that this health-giving profession of ours has grown up.
