Prep. This is prepared by pouring a solution of terchloride of antimony into water, and treating the resulting precipitate of oxy-chloride of antimony with carbonate of soda, by which means oxide of antimony and chloride of sodium are formed. The oxide is afterwards washed and dried at a heat not exceeding 212°.

Prop. & Comp. Teroxide of antimony (Sb O3) is a white powder fusible at a low red heat, and readily dissolved by hydrochloric acid. The solution, dropped into distilled water, gives a white deposit, changed to orange yellow by sulphurretted hydrogen. Oxide of antimony does not yield any sublimate when fused in a test tube, showing the absence of arsenious acid; and it dissolves entirely when boiled with an excess of the acid tartrate of potash.

Off. Prep. Pulvis Antimonialis. [Not officinal in U. S. P.] Antimonial Powder. (Oxide of antimony, one ounce; precipitated phosphate of lime, two ounces.) This is intended as a substitute for "James' powder."

Therapeutics. The oxide of antimony is analogous in its action to tartar emetic; but on account of the slowness with which it dissolves in the stomach, it is less likely to cause local irritation, and it may be employed with advantage when the diaphoretic and slightly alterative effects of antimony are required.

Dose. Of oxide of antimony, 1 gr. to 5 gr.; of antimonial powder, 3 gr. to 15 gr.