If, on the other hand, the sleep be profound and heavy, we must abstain from frequent baths and cooling unguents; we must use masticatories, and upon the whole change the regimen for one of a hotter, drier, and less nutritive character, because the affection is occasioned by a cold and humid matter irrigating the brain. * * * * * COMMENTARY. See the Commentary on the Sections on Lethargy and Carus in Book Third. SECT. C.—THE EPISTLE OF DIOCLES ON THE PRESERVATION OF HEALTH.—DIOCLES TO KING ANTIGONUS. Since of all kings you are the most skilled in the arts, and have lived very long, and are skilled in all philosophy, and have attained the highest rank in mathematics, I, supposing that the science which treats of all things that relate to health is a branch of philosophy becoming a king and befitting to you, have written you this account of the origin of diseases, of the symptoms which precede them, and of the modes by which they may be alleviated. For neither does a storm gather in the heavens but it is preceded by certain signs which seamen and men of much skill attend to, nor does any disease attack the human frame without having some precursory symptom. If, then, you will only be persuaded by what we say regarding them, you may attain a correct acquaintance with these things. We divide the human body into four parts: the head, the chest, the belly, and the bladder.—When a disease is about to fix in the head, it is usually announced beforehand by vertigo, pain in the head, heaviness in the eyebrows, noise in the ears, and throbbing of the temples; the eyes water in the morning, attended with dimness of sight; the sense of smell is lost, and the gums become swelled. When any such symptoms occur, the head ought to be purged, not indeed with any strong medicine, but taking the tops of hyssop and sweet marjoram, pound them and boil them in a pot with half a hemina of must or rob, rinse the mouth with this in the morning before eating, and evacuate the humours by gargling. There is no gentler remedy than this for affections of the head. Mustard in warm honied water also answers the purpose very well. Take a mouthful of this in the morning before eating, gargle and evacuate the humours. The head also should be warmed by covering it in such a manner as that the phlegm may be readily discharged. Those who neglect these symptoms are apt to be seized with the following disorders: Inflammations of the eyes, cataracts, pain of the ears as if from a fracture, strumous affections of the neck, sphacelus of the brain, catarrh, quinsy, running ulcers called achores, caries, enlargement of the uvula, defluxion of the hairs, ulceration of the head, pain in the teeth.—When some disease is about to fall upon the chest, it is usually announced by some of the following symptoms: There are profuse sweats over the whole body, and particularly about the chest, the tongue is