swellings and indurations; and in itch, scald-head, chilblains, &c.
2. (W. Cooley.) Binoxide of manganese, 1 dr.; sulphur, 2 dr.; lard, 9 dr.; cajeput oil, 15 drops. As the last; also as a friction in rheumatism, swelled joints, &c., and in porrigo, and some other skin diseases.
Ointment of Oxide of Mer′cury. Under this name the two ointments noticed below are often confounded, owing to the different opinions held respecting the atomic weight of mercury:—
1. Ointment of Grey Oxide of Mer′cury. Syn. Ointment of suboxide of mercury, O. of protoxide of m.†; Unguentum hydrargyri oxydi, U. h. suboxydi, U. h. o. cinerei, L. Prep. 1. (Ph. E. 1817.) Grey oxide of mercury, 1 oz.; lard, 3 oz.; triturate together. Formerly proposed as a substitute for mercurial ointment, but in practice it has been found useless as a friction, owing to the unctuous matter only being absorbed, whilst the oxide is left on the surface. This objection does not apply to the following preparations:—
2. (Donovan.) Grey oxide of mercury, 20 gr.; lard, 1 oz.; mix, and expose them to the temperature of 320° Fahr. for 2 hours, constantly stirring. Grey coloured. It may also be made from the nitric- or red-oxide in the same way, by keeping the ointment heated to about 300° for some hours. Cleaner and stronger than Ung. hyd. fort.—Ph. L.
3. (Tyson.) Black oxide of mercury (prepared by decomposing precipitated calomel with liquors of potassa and ammonia), 2 oz.; lard, 1 lb.; triturate together. Inferior in activity to the last. It closely resembles in appearance a fine sample of mercurial ointment.
2. Ointment of Red Oxide of Mercury. Syn. Unguentum hydrargyri binoxidi†, U. h. oxydi rubri, L. Prep. (Cazenave.) Red oxide of mercury, 30 gr.; camphor, 5 gr.; lard, 1 oz. Closely resembles ointment of nitric oxide of mercury, over which it, perhaps, possesses some advantage from the oxide being in a more minutely divided state.
Ointment of Oxide of Sil′ver. Unguentum argenti oxydi, L. Prep. (Serre.) OXIDE OF SILVER, 16 to 20 gr.; lard, 1 oz. As a dressing for scrofulous and syphilitic sores, &c.
Ointment of Oxide of Zinc. Syn. Zinc ointment; NIHIL ALBUM OINTMENT†; Unguentum zinci (B. P., Ph. L., E., & D.), U. oxydi zinci, L. Prep. 1. (Ph. L.) Oxide of zinc, 1 oz.; lard, 6 oz.; mix them together.
2. (Ph. E.) Oxide of zinc, 1 oz.; simple liniment (Ph. E.), 6 oz.