(Cream of Tartar.)

Origin. - Prepared by purifying and crystallizing argol or crude tartar, a residuum of grape-juice after fermentation.

Description and Properties. - Colorless or slightly opaque, rhombic crystals, or a white, somewhat gritty powder, odorless, and having a pleasant, acidulous taste; permanent in the air. Soluble in about 200 parts of water and in about 16.7 parts of boiling water; very slightly soluble in alcohol.

Dose. - 10 grains to 1/2 ounce (0.6-16.0 Gm.) [30 grains (2 Gm.), U. S. P.].

Official Preparation

Pulvis Jalapae Compositus - Pulveris Jalapae Compositi - Compound Powder of Jalap. - Dose, 10-30 grains (0.6-2.0 Gm.) [30 grains (2 Gm.), U. S. P.]; used as a hydragogue cathartic.