XVIII. On the constitution of the resins. Part IV

Abstract

When the purest scammony of commerce is digested in cold alcohol, a pale yellow solution is obtained, which, on evaporation, gives a pale yellow, opake, hard, and friable resin. Heated to 300° Fahr. this resin melts, becomes transparent, and emits a peculiar odour. By the action of the alcohol the crude scammony is very little diminished in bulk. A. After heating forty-eight hours at 250° Fahr. the resin obtained from the alcoholic solution was still in the state of powder, and 12·69 grs. gave Ċ = 25·74, and Ḣ = 9·06 grs.