CHOLEIC ACID, AMMONIA, &c. 145 



and ammonia contain the elements of proteine in a pro- 

 portion almost identical with that of proteine itself, (see 

 p. 129) ; it is obvious that, if from 5 at. of proteine, 

 with the addition of oxygen and of the elements of 

 water, there be removed the elements of choleic acid and 

 ammonia, the remainder will represent the elements of 

 hippuric acid and of urea ; and that if, when this separa- 

 tion occurs, and during the further transformation, the 

 elements of starch be present and enter into the new 

 products, we shall obtain an additional quantity of choleic 

 acid, as well as a certain amount of carbonic acid gas. 



That is to say, that if the elements of proteine and 

 starch, oxygen and water being also present, undergo 

 transformation together and mutually affect each other, 

 we obtain, as the products of this metamorphosis, urea, 

 choleic acid, ammonia, and carbonic acid, and besides 

 these, no other product whatever. 



The elements of 



5 at. proteine ") f 9 at. choleic acid 

 15 at. starch II 9 at. urea 

 12 at. water i j 3 at. ammonia 



5 at. oxygen J 1.60 at. carbonic acid 

 In detail, 



5 at. proteine, 5 (C 48 N 6 H 36 O 14 ) = C 240 N 30 H 180 O 70 



15 at. starch, 15 (C 12 H 10 O 10 ) = C 180 H 150 O 150 



12 at. water, 12 ( HO ) = H 12 O 12 



5 at. oxygen, = O 6 



The sum is ......... = C 4 2oN 30 H 3 4 2 O23 7 



and, 



9 at. choleic acid, 9 (C 38 N H 33 O n ) = C 342 N 9 H 29r O 99 

 9 at. urea, . . . . 9 (C 2 N 2 H 4 O 2 ) = C 18 N 18 H 36 O 18 



3 at ammonia, . . 3 ( N H 3 ) = N 3 H 9 

 60 at carbonic acid, 60 (C O 2 ) = C 60 O 120 



The sum is 



13 



