ZINCI CARBONAS PRAECIPITATUS—PRECIPITATED ZINC CARBONATE
Derivation.—Solutions of nearly equal weight of sodium carbonate and zinc sulphate are boiled together; dry precipitate. This salt is in reality a mixture of zinc carbonate and oxide, in varying proportions, with water of crystallization.
Properties.—An impalpable white powder, of somewhat variable chemical composition, without odor or taste; insoluble in water or alcohol.
ZINCI OXIDUM—ZINC OXIDE
Derivation.—Zinc oxide, may be prepared by exposing zinc carbonate to a dull red heat, or from metallic zinc by combustion.
Properties.—An amorphous, white powder without odor or taste. Insoluble in water or alcohol.
Dose.—Horses and cattle, 1 to 2 dr.; sheep and pigs, 10 to 20 gr.; dogs, 5 to 10 gr. Not much used internally.
PREPARATIONS
UNGUENTUM ZINCI OXIDE—OINTMENT OF ZINC OXIDE
Composed of zinc oxide, 200 parts; benzoinated lard, 800 parts.