94 



the Glutin separates together with mucin, while a portion only 

 remains dissolved in water by means of the gum. From this 

 aqueous solution the gum is thrown down with alcohol and 

 the liquid evaporated. Glutin is pale, yellow, tough, more or less 

 glutinous, tasteless, of a faint peculiar odour, dries to a yellow 

 transjiarent mass. It only swells up in water and soon becomes 

 putrid; it dissolves in hot alcohol, in cold alcohol only partially, 

 also partially in acetic acid, not in ether, readily in potash-ley. 



GlycerillirCeHs O3 + 3 HO. Almost in every fat combined 

 with fat-acids, and separated from the latter by saponification. 

 Saponify any fat with soda-ley, decompose the soap with diluted 

 sulphuric acid, filter, saturate the liquid with carbonate of soda, 

 evaporate, shake the pulpy remnant with strong alcohol, and 

 evaporate the solution. To remove all water, keep for a rather long 

 time at a tempei-ature of 120°. Colourless syrup of a pure sweet 

 taste, uncrystallisable, inodorous, neutral, of 1*27 density; distils 

 partly when boiled with water; decomposes when heated by 

 itself, while evolving vapoui's (acrolein) of a highly offensive and 

 acrid odour; burns on the open fire like an oil; mixes with 

 water and alcohol in eveiy proportion; is insoluble in ether. 



[Glycerin on a large scale, and perfectly coloiirless and pure, is 

 now obtained as a bye-product from soap and candleworks, when 

 the fats are distilled by high-pressure steam, and are thereby 

 decomposed into fat-acids and glycerin. — F. v. M.J 



Glycyrrliizill=C48 'Km Ois. In the root of Glycyrrhiza glabra 

 and G. echinata and in Monesia bai'k (from Lucuma glycyphlaea) ; 

 it is not decided yet if the substances of similar properties from 

 the leaves of Abrus precatorius, from the root of Polypodium 

 vulgare and from Sarcocolla are identical with Gh'cyrrhizin. Ma- 

 cerate in water, boil the solution, filter, concentrate and j^recipitate 

 with diluted sulphuric acid. The at first pale yellow flocks unite 

 slowly to a dark-brown viscid mass, which has to be washed 

 i'e]Deatedly with water until free from sulphuric acid (on testing 

 with soluble salts of baryta); it is then dissolved in alcohol of 80%, 

 and the moderately-concentrated solution mixed with small 

 quantities of ether; a brown resin, which separates after a short 

 time, is removed, the ether-alcoholic solution evaporated on the 

 water-bath, redissolved in alcohol, mixed with ether, filtered and 

 evaporated. — Amorphous, yellow-white })owder, smells in the alco- 

 holic solution similar to an infusion of liquorice ; has an intensely 

 bitter-sweet taste, is of a strongly acid reaction when dissolved iii 

 water, fuses at 200°, and is destroyed in a higher temperature; 

 dissolves slowly in cold, readily in hot water, with yellow colour, 

 and a small portion separates on cooling under the form of resinous 

 drops ; dissolves abundantly in alcohol, less readily (according to 

 others not at all) in ether; is not fermentable; is precipitated in 



