For these spreading and putrid sores Aëtius, among other prescriptions, gives one which would no doubt be applicable in the worst cases: “Of crude misy, of crude chalcitis, ā dr. viij; of ochre, dr. iij; of sandarach, dr. iv; of quicklime, dr. ij; of the scales of copper, of alum, ā dr. ij; of diphryges dr. iij; m.” These caustic and escharotic medicines enter into the composition of many of his applications. Some of them contain astringents and desiccants, such as sumach, galls, alum, fossil salts, frankincense, calamine, birthwort, pomegranate rind, &c. In short the ingredients in his applications correspond with Celsus’s list of corrosive substances: Rodunt, alumen liquidum, sed magis rotundum, ærugo, chalcitis, misy, squama æris, sed magis rubri, æs combustum, sandaracha, galla, thus, auripigmentum, calx, nitrum et spuma ejus, alcyonium, resina, squama ferri, atrumentum sutorium, veratrum, &c. The other authorities give only combinations of these substances; for a full account of which preparations we refer the reader to Galen. (Med. sec. gen. iv.) Octavius Horatianus recommends lentils boiled and mixed with honey; the leaves of cabbage, coriander, or ivy, all mixed with honey. The Arabians, although they supply nothing new, add their authority in confirmation of the remedial virtues which the Greeks assigned to the substances mentioned above. Avicenna and Rhases recommend arsenic, copperas, misy, sori, chalcitis, flos æris, quicklime, alum, galls, ammoniac, the trochisk of Andron, &c. When a part becomes black and putrid, Haly Abbas directs us to open a vein leading to it, if the age and state of the patient permit, and afterwards to apply odoriferous things, such as camphor, &c. SECT. XLV.—ON ULCERS REQUIRING CICATRIZATION.