GELATIN

n. Je2l'a2t-i2n. Lat.. gelatin a [Ger. Ph., 1st ed.] coll a, gelatin a alba [Norw. Ph., Ru . Ph., Swed. Ph.]. Fr., gelatine animate [Fr. Cod.] grenetine [Fr. Cod.]. Ger., Leim, Gallerte. It., gelatin a. Sp., gelatin a, cola [Sp. Ph.] grenetina. A substance obtained from white connective-ti ue fibrils by piolonged boiling or by the action of very dilute acids upon collagen. Commercial g. (Flemish g.) is obtained by the prolonged boiling under pre ure of hoofs, bones, cartilage, leather, and the skins of various animals, etc. Pure g. is obtained by repeated maceration in water, with subsequent heating, followed by filtration. It then consists of white fibrils, devoid of taste and odor, which are insoluble in cold water, but swell up in the latter into a ma which di olves in water into a colorle liquid that, on cooling, gelatinizes, i. e., sets into a tremulous, translucent jelly. G. is insoluble in alcohol, ether, and chloroform; soluble by the aid of heat in glycerin (see Glycerin-g.). Its aqueous solution is laevorotary. It contains carbon, 50'2 per cent.; oxygen (with or, according to most, without sulphur), 25 per cent.; nitrogen, 17'9 per cent.; and hydrogen, 67 per cent. Its composition is C76 HmN.,4O29 [Schutzenberger and Bourgeois] or CloaH, M - NaiOst [Hofmeister |. G. is official in several pharmacopoeias, being used for the preparation of baths (see BALNEUM gelati no sum), for which the commercial g. is used, and for the preparation of capsules, pearls, etc., for which purified g. (q. v.) is used. The latter is the only kind official in the Ger. Ph., Ru . Ph., Norw. Ph., and Swed. Ph. G. is also used in microscopy as a culture-medium for micro-organisms and for other purposes. See GLYCERIN g. [B, 13, 95, 270.] Animal g. See G. Bone g. Fr., gelatine des os. Ger., extract of physostigma, drying on plates, and cutting into 100 equal squares or discs: used in ophthalmic practice. [" Proc. of the Am. Pharm. A oc.," xxiii (a, 14).] Chinese g. See Vegetable q (1st def.). Chromatized g. Ger., Chromleim. A mixture of 1 part of pota ium bichromate and 5 parts of a 10-per-cent. solution of g. [B. 5 (a. 14).] Cologne g. See Flemish g. Cooper's g. Probably the dried froth of a solution of pure bone-glue; used as a sub either of ordinary g., glycerin-g., or the gelatinous principle of agar-agar. [B.] Deane's g. A mixture of g. and honey devised by Deane for mounting microscopic objects. It is now replaced by glycerin jelly. [J, 113.J Elastic g. A preparation made by di olving g. in a water-bath, evaporating till it becomes quite thick and then adding the same weight of thick glycerin as of the dry g used. [" Proc. of the Am. Pharm. A oc.," vi (o, 14).] Cf. Glycering.~Fleischpeptong' (Ger.), Fleischwa erpeptong' (Ger ) Meat-peptone g. [Koch (A, 521).] Flemish g. Fr., colle de Flandre, colette. Ger., Kolner Leim. Sp.. cola de Flandes [Sp Ph ] Bright-yellow, translucent g. [B, 92, 270.] G. bath. See BALNEUM gelati no sum. G. capsules. See G. CAPSULE, CAPSULA operculata, and Medicinal PEARLS. G. for the bath. See Flemish g G'- G. peptone. See under PEPTONE. G. suppository. Ger G'1- suppositorium. A suppository the basis of which is g' [B 270 ] Japanese g. See Vegetable g. (1st def.). Liquid g. G di olved m acetic or some other acid, frequently used as mucilage [J Mayeiice g. Fr., colle de Mayence. A factitious isingla used]in solution as a sooth-'ng lotion in enteritis and as an injection in vesical irritation. It is also employed in making court-plaster. [L, g (a, 21). 1 Medicated g. Lat., gelatin a medic at a in lamellis Ger., medicament8M Leimbldttchen. A form of internal medicament made by adding the drug to a solution of g. and glycerin, dryig in a thin layer, and dividing into small tablets. An elastic dre ing is made by di olving the tablets in warm water, and applying with a brush. ["Proc. of the Am. Pharm. A oc.," xvii, xxx i'i (<T i.J Meta-g. G. that has been so altered by boiling with water KVJ, uuinr K., wuiuii usuaiiy nas a miiKy appearance rrom tne presence of calcium phosphate. [B, 270.] Purified g. Lat gelaf<na [Gr. Ph., 1st ed.], gelatin a alba [Ru . Ph., Swed. Ph., Norw. rn.J (seu albi ima). Fr., grenetine [Fr. Cod.], colle de Flandres O, no; O2. not; O3, whole; Th, thin; Th2, the; U, like oo in too; 215 [s. 163]