140 GLYCIN. 



ethylinimine C 2 H 4 . NH. ] It has however been recently shown that 

 the two substances are not identical, and it has further been stated that 

 the composition of spermin is most probably represented by the formula 



AMIDES AND AMIDO-ACIDS. THEIR DERIVATIVES 

 AND ALLIES. 



AMIDO-ACIDS OF THE ACETIC SERIES. 



1. Amido-formic acid. NH 2 . COOH. 



This substance is identical with carbamic acid, one of the amido- 

 derivatives of carbonic acid, the first acid of the oxalic acid series. It 

 will be described under the oxalic group. 



2. Glycin. C 2 H 5 N0 2 . [CH 2 (NH 2 ).COOH]. (Amido-aceticacid.) 

 (Also called Glycocoll and Glycocine.) 



Does not occur in the free state in the animal body but enters into 

 the composition of several important substances, more especially hippu- 

 ric and glycocholic acids. It is also a product of the action of hydriodic 

 acid on uric acid, and of boiling acids and caustic alkalis on gelatin : 



FIG. 7. GLYCIN CKYSTALS. (After Funke.) 



hence the name glycocoll or gelatin-sugar, since it possesses a sweet taste. 

 It crystallises in large, colourless, hard rhombohedra, or four-sided prisms 



1 Ladenburg u. Abel, Ber. d. d. chem. Gesell. Jahrg. xxi. (1888), S. 758. Ethy- 

 linimine appears (see next ref.) to be nothing but piperazine, Hofman's diethylene- 

 diamine. 



2 See Majert u. Schmidt, Ibid. Jahrg. xxiv. (1891), S. 241. Poehl, Ibid. 

 S. 359. 



