64 



THE GELATIN FROM WHITE 



IIL 0.2789 gram substance gave 0.5118 gram C0 2 = 50.04 per cent C, and 



0.1650 gram H 2 = 6.57 per cent H. 



IV. 0.2006 gram substance gave 0.03566 gram N = 17.77 per cent N. 

 V. 0.1934 " " " 0.03435 " N = 17.76 " N. 



VL 0.9458 " " " 0.0214 " BaSO 4 = 0.309 per cent S. 



VII. 0.8236 " " " 0.0202 " BaS0 4 = 0.336 " S. 



VIII. 0.6468 " " " 0.0021 " ash = 0.324 per cent ash. 



COMPOSITION OF THE ASH-FREE SUBSTANCE. 



PREPARATION B. 



This preparation was made from calves' tendons, Achilles 

 tendons, the method pursued being exactly similar to that 

 made use of in preparation A. 



The composition of the gelatin, dried at 110 C. until of 

 constant weight, was as follows : 



L 



n. 

 m. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XL 



0.2773 gram substance gave 0.5088 gram C0 2 = 50.03 per cent C, and 



0.1597 gram H 2 O = 6.39 per cent H. 

 0.2711 gram substance gave 0.4957 gram CO 2 = 49.86 per cent C, and 



0.1614 gram H 2 O = 6.61 per cent H. 

 0.6762 gram substance gave 1.2323 gram C0 2 = 49.69 per cent C, and 



0.3934 gram H 2 O = 6.46 per cent H. 

 0.4643 gram substance gave 0.8476 gram CO 2 = 49.73 per cent C, and 



0.2734 gram H 2 O = 6.54 per cent H. 



0.2469 gram substance gave 0.04409 gram N = 17.86 per cent N. 

 0.2105 " " " 0.03754 " N = ""~ 



0.6945 

 0.7304 

 1.0424 

 0.3090 

 0.4839 



0.03754 



0.0115 



0.0127 



0.0180 



0.0010 



0.0020 



= 17.79 " N. 

 BaSO 4 = 0.226 per cent S. 

 BaSO 4 = 0.238 " S. 

 BaSO 4 = 0.236 " S. 

 ash = 0.323 per cent ash. 

 ash = 0.413 " ash. 



COMPOSITION OF THE ASH-FREE SUBSTANCE. 

 (Average ash = 0.368 per cent.) 



L n. m. rv. v. VL vn. vnx ix. Average. 



Carbon, 60.21 60.04 49.87 49.91 60.01 



Hydrogen, 6.41 6.63 6.48 6.56 6.62 



Nitrogen, 17.91 17.85 17.88 



Sulphur, 0.226 0.238 0.236 0.233 



Oxygen, 25.36 



