For ephemerals occasioned by labour, he recommends the tepid bath, and friction with the pulp of melons. Avicenna remarks, that if, in ephemerals, the blood become inflamed, the fever is apt to be converted into synochous, or, if it become putrid, into putrid fever. This, he says, is particularly the case, when the ephemeral fever is connected with obstruction of the pores of the skin. For the cure of this species, he approves of venesection. He recommends the same remedy when the disease arises from drinking too much wine, or from aposteme of the groin, armpits, or neck. His expositor Syrasis particularly commends the tepid affusion in ephemerals. Rhases joins in enforcing the same practice as Avicenna. He gives a most comprehensive account of the causes of these fevers. Like all the other authorities, he decidedly inculcates this important fact, that, although ephemeral fever be in itself neither serious nor fatal, it may be converted into a vehement and acute fever, when any error is committed in the regimen or method of cure. Constriction, he says, may take place, either in the pores of the skin, or in the internal parts, and is generally occasioned by cold or astringents. This is one of the causes of fever. The others are, immoderate exercise, the application of heat, food of a heating nature, and putridity. According to Prosper Alpinus, the Methodists held that the proximate cause of fever is constriction. Galen, as we have stated, held this to be one of the causes, but not the sole one. The Methodists, like our Cullen and Hoffman, seem to have generalized too much. Their most approved remedies were the warm bath and friction with emollient oils. (De Med. Method. v.) The earlier modern writers on medicine give the same account of ephemerals as their ancient masters, whose views in all cases they servilely adopt. See Rogerius (Tract. iii), and Platearius (de Febribus.) Rogerius correctly remarks, that ephemeral fever, from enlargement of the glands, is merely symptomatic. The causes of ephemerals, as enumerated by him, are exposure to extremes of heat and cold, food and drink of a heating nature, strong exercise, violent passions of the mind, and the like. Platearius remarks that if an ephemeral be prolonged beyond the third or fourth day, it is apt to be converted into a putrid fever. SECT. XVII.—ON DIAGNOSIS OF FEVERS FROM PUTREFACTION.