The purified fat of the hog, Sus Scrofa, B.P.; the prepared internal fat of the abdomen of Sus Scrofa purified by washing with water, melting, and straining, U.S.P.

Characters. - A soft white fatty substance, melting at about 100° F. Has no rancid odour.

Solubility. - It dissolves entirely in ether.

Reactions. - Distilled water in which it has been boiled should not acquire an alkaline reaction (absence of alkalis). A portion of the water when cooled and filtered, and another portion acidulated with nitric acid, should give no precipitate with nitrate of silver (absence of salt), and is not rendered blue by the addition of solution of iodine (no starch). "When heated for several hours on the water-bath, under frequent stirring, lard should not diminish sensibly in weight (absence of water).

Impurities. - Rancidity due to acrid fatty acids, alkalis, common salt, starch, water.

Preparations.

B.P

Adeps Benzoatus.

Emplastrum Cantharidis. Unguentum Hydrargyri.

Unguentum Hydrargyri Nitratis. „ Iodi.

,, Terebinthinae.

U.S.P

Adeps Benzoinatus. Ceratum Resinas. Unguentum. Ceratum.

Camphorae. „ Cantharidis. ,, Extracti Cantharidis. „ Plumbi Subacetatis. ,, Sabinae. Unguentum Acidi Carbolici. „ Hydrargyri. „ „ Oxidi Flavi.

•i „ „ Rubri.

,, Mezerei. „ Acidi Gallici.

Unguentum Acidi Tannici.

,, Belladonnae.

„ Chrysarobini.

,, Gallae.

„ Hydrargyri Ammoniatae.

„ Iodi.

„ Iodoformi.

„ Plumbi Carbonatis. „ „ Iodidi.

„ Potassii „

„ Stramonii.

,, Sulphuris. ,, „ Alkalinum.

Veratrinae.

„ Zinci Oxidi.

Adeps Benzoatus, B.P.; Adeps Benzoinatus, U.S.P.

Benzoated Lard.

Preparation. - By mixing powdered benzoin (2 parts, U.S.P.; 2 drachms, B.P.) with melted lard (100 parts, U.S.P.; 1 lb. B.P.) and straining. The benzoin prevents the lard from becoming rancid.

Preparations.

b.p.

Unguentum Aconitinae. ,, Atropinae. „ Belladonnae. ,, Calaminae. „ Chrysarobini.

Gallae. „ Hydrargyri Subchloridi. „ Iodoforaii.

Unguentum Plumbi Acetatis.

,, Potassii Iodidi.

„ Sabinae.

„ Simplex.

„ Staphysagriae.

,, Sulphuris.

„ Zinci.

Uses. - Lard is emollient. It is used in the preparation of ointments, and spread upon poultices to prevent them from getting dry or sticking to the surface of the body.