COMMENTARY. Galen’s explanation of the philosophy of the sense of appetite is very interesting. He remarks that the appetite is a refined species of touch, the seat of which is the mouth of the stomach, which, therefore, is supplied with nerves direct from the brain. He goes on to remark, that the earth is to plants what the stomach is to animals, supplying them with abundance of food as long as it is moistened by seasonable rains; but, when it becomes parched with drought, the plants in like manner are dried up for want of nutriment. (This comparison is borrowed without acknowledgment from Aristotle.) To animals, then, as not being fixed to the earth (with a few exceptions), nature bestowed a stomach which is to them a repository of food, such as the earth is to plants, and she further gave them a sense of want by which they have the desire of being filled with food and drink in due season. This desire of being filled is called the appetite, which arises from a sense of want, when the veins of the stomach absorb, and, as it were, suck from it, whereby a painful feeling is excited, the proper cure of which is a supply of food. The sensation then of sucking constitutes hunger. The loss of appetite may arise either from the sense of the sucking being lost, or from the process of sucking (absorption?) not taking place, or from the body not being evacuated. (De Causis Sympt. i, 7.) He treats of stomach affections very fully in his work ‘De Med. sec. Locos.’ (viii.) Treatment similar to our author’s is recommended by Alexander (vii, 7), and by Oribasius (Synops. vi, 35.) Avicenna evidently takes his plan of treatment from our author, for he recommends emetics, and afterwards fragrant things, with a plaster composed of fruits laid over the stomach, and wormwood, aloes, &c., internally. (iv, 1, 2, 26.) Among the causes of loss of appetite mentioned by him in another place are general disorder of the constitution in fevers, severe thirst, repletion with depraved humours, and insensibility of the mouth of the stomach, so that it does not perceive the suction of the veins. (iii, 13, 2, 7.) Haly’s treatment is nearly the same. He recommends fragrant food and fragrant wine after the acme of the fever, gentle laxatives, and such modes of exercise as he can bear. (Pract. iii, 21.) SECT. LI.—ON BULIMOS OR INORDINATE HUNGER. If want of appetite should pass into the opposite state, I mean an excessive atrophy, called bulimos, we must resuscitate such persons with roasted pork, or kids, and other savoury things; and, in a word, with every strong-scented thing, if the acute stage of the fever be past. We must bind the extremities, and rouse, by pinching the cheeks, and pulling the hair and ears. When recovered, we must give bread that has been dipped in diluted wine, or any other diffusible thing. * * * * *