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 medicine which he calls Tetragonon, or four-cornered. Galen conjectures that this was a tablet of crude antimony. Leclerc more reasonably suggests that it was a term for certain special kinds of lozenges, and points out that not long after Hippocrates physicians used a trochiscus trigonus, or three-cornered lozenge for another purpose.

Although he used many drugs, Hippocrates is especially insistent on Diet as the most important aid to health. He claims to have been the first physician who had written on this subject, and this assertion is confirmed by Plato, who, however, somewhat grimly commends the ancient doctors for neglecting this branch of treatment, for, he says, the modern ones have converted life into a tedious death. Barley water is repeatedly recommended by the physician of Cos, with various additions to suit the particular case under consideration. Oxymel is the usual associate, but dill, leeks, oil, salt, vinegar, and goats' fat also figure.

Particular instructions are also given about the wine to be drunk, the kind, and the quantity of water with which it is to be diluted in spring, summer, autumn, and winter. In one place, at the end of the 3rd Book on Diet, a word is used which apparently means that persons fatigued with long labour should "drink unto gaiety" occasionally; but there is some doubt about the correct translation of that word.