This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
B. P., not official. - The purified cholesterin fat obtained as a bye-product in the dressing of sheep's wool.
Semi-transparent, pale yellow, tenacious body. Ignited, it burns with a sooty flame. Melts between 100o and 112° F.; 37.70 and 44.40 C.; odor like sheep's wool.
Before the separation of the fatty acids it consists of (1) Cholesterin and Isocholesterin, 70 per cent. (2) Fatty acids, 30 per cent.