Origin. - This substance is found in nature as the rare crystalline mineral gibb-site of North America - the diaspore of Eastern Europe. The aluminum hydrate may be prepared by precipitating the solution of an aluminum salt with an alkali or alkali carbonate.

Description and Properties. - A white light, amorphous powder, odorless and tasteless, permanent in dry air. Insoluble in water or alcohol, but completely soluble in hydrochloric or sulphuric acid, and also in potassium or sodium hydrate T. S.

Dose. - 3-6 grains (0.2-0.4 Gm.).

Alumini Sulphas - Alumini Sulphatis - Aluminum