Digest of Criticisms on the United States Pharmacopœia, Seventh Decennial Revision (1890) Published by the Committee of Revision and Publication of the Pharmacopœia of the United States of America (1890-1900) Part I-III ...

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Page 133 - ... required standard ; but they do not give the actual strength. There is no recognized test which under all circumstances will give uniform, impartial results, and slight variations in the manipulation will frequently occasion widely different results with the same pepsin. It must also be borne in mind that the real digestive power of a pepsin is measured by the amount of peptone which it is able to produce in a given time, under certain conditions; while, at present, it is usual to be satisfied...
Page 169 - A liquid consisting of dipentene and other hydrocarbons, obtained by the action of concentrated sulphuric acid on oil of turpentine and subsequent rectification with steam.
Page 47 - The volume (53-57'5cc.) of hydrogen evolved from one gram of beeswax and the percentage (12-5-14-5) of hydrocarbons evidently are the most reliable data securable. The former being vitiated by all adulterants except tallow and the latter by all except suint wax. — Laboratory, Smith, Kline & French Company, Philadelphia. Pa.
Page 169 - ... somewhat terebinthinate taste. Specific gravity : about 0.850 at 25 C. (77 F.) . Only slightly soluble in water, but soluble in three times its volume of alcohol. It boils at 155 to 165 C. (311 to 329 F.). On exposure to light and air, Terebene gradually becomes resinified, and acquires an acid reaction. Terebene should possess its characteristic agreeable odor, should not redden moistened blue litmus paper (absence of acids), and should be completely inactive toward polarized light...
Page 153 - ... than a slight amount of insoluble residue remains. Chloride — Dissolve 1 Gm. in 15 cc. of water, add 1 cc. of nitric acid and 1 cc. of silver nitrate TS : any turbidity produced is not greater than that produced in a blank to which 0.02 mg. of chloride has been added (0.002 per cent). Nitrate — To a solution of 1 Gm. in 10 cc. of water add 0.05 cc. of indigo carmine TS and 10 cc. of sulfuric acid. The blue color persists for 10 minutes (about 0.003 per cent as NOi).
Page 152 - A better and quicker test, taking advantage of the development of hydrogen sulphide, is to suspend a strip of white paper, moistened with a solution of acetate of lead, over the solution of sugar containing free acid.
Page 49 - ... by means of a water-bath, into a well-cooled receiver, taking care that the temperature in the retort does not rise above 67.2 C.
Page 76 - Caspari recommends to rub the opium to a smooth paste with water in a mortar, wash this carefully into a flask or bottle, add the remainder of the water, cork the bottle, and shake vigorously every hour or two; this procedure is easier than the official one. "Wash the residue until the filtrate is nearly colorless," it is as well to add

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