448 ANIMAL DRUGS 



DESCRIPTION. White, unctuous, smooth solid, melting at about 48C. 



(ii3F.). Sevum Praeparatum (U.S.) is identical with suet as 



above described. 

 CONSTITUENTS. Stearin, palmitin, and olein, with a preponderance of 



the first mentioned. 

 USES. Lenitive, as an external application and as a base for unctuous 



preparations. 



627. OLEUM BUBULUM. NEAT'S-FOOT OIL. From the fatty tissue of the 

 feet of the ox, previously deprived of hoofs, obtained by boiling in water 

 and skimming off the fat, which is subsequently strained and pressed. At 

 ordinary temperatures this is a semifluid, oleaginous fat, of a peculiar odor. 

 CONSTITUENTS. Mainly olein, with solid fats. Used externally. 



628. ADEPS. LARD 

 LARD 



The prepared internal fat of the abdomen of Sus scrof'aLinng (class, Mammalia; 

 order, Pachydermata), purified by washing with water, melting, and straining. 

 Lard should be kept in well-closed vessels impervious to fat, and in a cool place. 



DESCRIPTION. A white unctuous solid with faint odor and bland taste. 

 Insoluble in water. Soluble in chloroform, carbon bisulphide and 

 benzine. Specific gravity at i5C. (59F.) about 0.932. 



CONSTITUENTS. Olein, stearin, and palmitin; of the first mentioned it 

 consists of about 50 to 60 per cent. 



USES. Emollient, and as a base for ointments and cerates. 



628 a. OLEUM ADIPIS. LARD OIL. U.S. VIII. A pale yellowish or 

 colorless fixed oil having a slight odor and taste. It is produced by 

 exposing lard, at a low temperature, to strong pressure. 



CONSTITUENTS. Olein, with palmitin and stearin. Used externally. 



629. PEPSINUM. PEPSIN 



PEPSIN 



A mixture containing a proteolytic ferment or enzyme obtained 

 from the glandular layer of fresh stomachs of healthy pigs, and 

 capable of digesting not less than 3000 times its own weight of 

 freshly coagulated and disintegrated egg albumen. See details of 

 test U.S.P. IX. 



SOURCE. Pepsin is prepared from the stomach of the ox (Bos taurus), 

 the sheep (Ovis aries), or the hog (Sus scrofa), the mucous membrane 

 being the part used. Several methods have been employed for its 

 extraction. The ordinary methods of manufacture may be briefly 

 stated as follows: 



(i) The extraneous matter is first removed from the inner surface 

 of the stomach by washing, and the mucous membrane scraped off 



