The author in this paper communicated to the Society an account of Creazote, a new organic principle lately discovered by M. Reichenbach, which possesses remarkable antiseptic properties, and is the source of the antiseptic power of wood-smoke, empyreumatic pyroligneous vinegar, and other empyreumatized substances; also of a very volatile fluid, lately put into his hands by Mr Enderby of London, which is obtained by the destructive distillation of caoutchouc, and possesses in a higher degree than any other menstruum the property of dissolving that substance; and lastly, of three new crystalline bodies which have lately been discovered by M. Robiquet, and other French chemists, in opium, and which are named Narceïne, Meconine, and Codeïne. Specimens of the several substances were exhibited.