Theou megaloio hekēti, Ad theses hasce de locorum affectorum cognitione generali

then the pain, which is perceived by itself or through the use of acrid things, definitely shows whether the ulceration is in the throat, the fundus of the stomach, or its orifice, depending on the different places where it is felt.

PARERGON I.

IF like does not act upon like, then every action will proceed from its opposite: therefore, this is also true of health and disease. For whatever is similar and friendly to that which is according to nature, is inimical and dissimilar to that which is contrary to nature; and whatever is similar to that which is contrary to nature will be dissimilar and inimical to that which is according to nature. Hence we deduce that saying of our old man Hippocrates, delivered as if from the tripod of Apollo: ta enantia tōn enantiōn iēmata opposites are the remedies for opposites.

II.

A prudent physician, instructed by both pieces of property referring to accumulated wisdom, namely experience and reason, does not require Fortune in acting, as Hippocrates asserts in his work On Places in Man.

III.

Nor should Medicine be called uncertain simply because it does not always attain its end. This is certainly not to be attributed to the art itself, which in matters that are possible always achieves its desire, but rather to the practitioner unskilled in operations, or to the violence of the disease overcoming all medicines, or to the disobedience of the patient.

Hence