RELATION OF PROTEINE TO GELATINE. 135 



urine of the foetal calf, to the nitrogenized constituents 

 of the urine in animals which respire, are, as may be 

 seen by comparing the above formulae, such as cannot 

 be overlooked or doubted. Allantoine contains the 

 elements of uric acid and urea, that is, of the nitro- 

 genized products of the transformation of the com- 

 pounds of proteine. 



36. Further, if to the formula of proteine, multiplied 

 by 3, we add the elements of 4 at. of water, and if we 

 deduct from the sum of all the elements half of the ele- 

 ments of choloidic acid, there remains a formula which 

 expresses very nearly the composition of gelatine. 

 From 



3 (C 48 N 6 H 36 14 ) + 4 HO . . . = C 144 N 18 H 112 46 

 Subtract at. choloidic acid = C 36 H 28 O 6 



There remain C 108 N 18 H 84 O 40 (35) 



37. 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) C 108 N 18 H 84 O4o 

 Subtract 2 at. proteine .... C 96 N 12 H 72 O 28 

 There remain C 12 N 6 H 12 O 12 = 



3 at. allantoine C 12 N 6 H 9 O 9 

 3 at. water . . H 3 O 3 



!1 at. uric acid C 10 N 4 H 4 O 6 J f 

 1 at. urea . . C 2 N 2 H 4 O 2 > = < 

 4 at. water H 4 O 4 ) ( 



C 12 N 6 H 12 12 C 12 N 6 H 12 12 



38. The numerical proportions calculated from the 



above formula differ from those actually obtained in the 



analyses of MULDER and SCHERER in this, that the 



latter indicate somewhat less of nitrogen in gelatine ; 



