Characters. - A yellow powder readily dissolved by hydrochloric acid, yielding a solution which, with solution of ammonia, gives a white precipitate. It is entirely volatilised when heated to incipient redness, being resolved into oxygen gas and the vapour of mercury.

Preparations.

u.s.p.

Unguentum Hydrargyri Oxidi Flavi (1 in 10 of Unguentum).

B. And U.S.P. Oleatum Hydrargyri (yellow oxide 10, oleic acid 90, parts).

Uses. - The oleate of mercury acts beneficially in ringworm,, and may be used for inunction in cases of syphilis in doses of 10 to 30 drops.