GLYCINE. 151 



Horsford has prepared the following basic hydrochlorates : 

 2C 4 H 4 NO 3 + HO + HC1, rhombic prisms not affected by the 

 atmosphere; 2(C 4 H 4 NO 3 .HO) 4-HC1, which crystallises well; 

 3C 4 H 4 NO 3 + 2HO + 2HC1 was obtained from dry glycine in 

 hydrochloric acid gas; in a similar way the same salt was 

 obtained with only 1 atom of water ; these basic salts ^ might 

 possibly be mixtures of two salts. Berzelius* obtained a combi- 

 nation of hydrochlorate of glycine and bichloride of platinum, by 

 extracting a mixture of these two compounds with absolute alcohol, 

 and then precipitating the excess of hydrochlorate of glycine from 

 the solution by ether; the double compound which he thus 

 obtained, occurred in the form of yellow, oily drops, which when 

 exposed to the air crystallised in yellow needles like wavellite ; 

 this compound is easily soluble in water and in alcohol, and con- 

 tains much water of crystallisation, in which respects it is very dif- 

 ferent from the analogous double compounds of most of the alka- 

 loids. If, however, free glycine be mixed with bichloride of 

 platinum, a compound is formed which is represented by 

 C 4 H 4 NO 3 + 2HO + PtCl 2 , and occurs in black (Berzelius) or red 

 crystals, (Horsford.) The following compounds with sulphuric acid 

 were obtained by Horsford : C 4 H 4 NO 3 .SO 3 ; C 4 H 4 NO 3 .HO.SO 3 ; 

 3(C 4 H 4 NO 3 .HO) + 2(SO 3 .HO); 3C 4 H 4 NO 4 + 2SO 3 + HO ; 

 3(C 4 H 4 NO 3 .HO) +2SO 3 + HO. 



Nitrate of glycine, C 4 H 4 NO 3 .HO + NO 5 .HO., usually occurs in 

 the form of acicular crystals, but sometimes as large tabular crystals 

 of the monoclinometric system ; these crystals are unaffected by 

 exposure to the atmosphere and have an acid taste. 



Nitrate of glycine was formerly regarded as a conjugated acid, 

 but these compounds which result from the union of nitrate of 

 glycine with bases, are true nitrates, since, as Horsford has 

 shown, they are directly produced on digesting the nitrates with 

 glycine. 



Oocalate of glycine, C 4 H 4 NO 3 .HO.C 2 O 3 , occurs in wavellite- 

 like crystals which are unaffected by exposure to the atmosphere. 



Acetate of glycine, C 4 H 4 NO 3 .HO.C 4 H 3 O 3 H-2HO, is crystal- 

 Usable, and insoluble in alcohol. 



Horsford further observed that glycine formed crystallisable 

 compounds with many salts, (similar to that which it forms with 

 bichloride of platinum,) most of which contain 1 atom of glycine to 

 1 atom of the salt. With bases, especially with hydrated baryta 

 and potash, crystallisable compounds are also formed. Protoxide 

 * Jahresber. Bd. 27, S. 658. 



