142 RELATION OF PROTEINE TO GELATINE. 



and if we deduct from the sum of all the elements 

 half of the elements of choloidic acid, there remains 

 a formula which expresses very nearly the composi- 

 tion of gelatine. From 



3 (C^NoHssOh) + 4 ho... = Cu4Ni3Hn20,6 

 Subtract ^ at. choloidic acid = C36 Hog Og 



There remain CiosNigH ^4040 (35) 



38. Subtracting from this formula of gelatine 

 the elements of 2 at. of proteine, there remain the 

 elements of urea, uric acid, and water, or of 3 at. of 

 allantoine and 3 at. of water. Thus — 



Formula of gelatine (Mulder) Cio8Ni8H^04o 

 Subtract 2 at. proteine C geNioH-oOas 



There remain C joN 6H12O12 = 



r 1 at. uric acid C:oN4H4 Oe ^ f 

 _ 1 at. urea ... C, N.H^ O, U^ ^^^ ^^^^*°^^^ ^^^^^"^ ^^ 



I 



4 at. water H4 O4 



3 at. water ... H-. O 



3 ^3 



CioNgHioOi, C12N6H12O12 



39. The numerical proportions calculated from 

 the above formula differ from those actually ob- 

 tained in the analyses of Mulder and Scherer in 

 this, that the latter indicate somewhat less of nitro- 

 gen in gelatine ; but if we assume the formula to 

 be correct, it then appears, from the statement just 

 given, that the elements of two atoms of proteine, 

 plus the nitrogenised products of the transformation 

 of a third atom of proteine (uric acid and urea) and 

 water ; or three atoms of proteine, minus the ele- 

 ments of a compound containing no nitrogen, which 



