xo 



SECRETIONS AND EXCRETIONS. 15 



choleic acid, ammonia, and carbonic acid, and besides 

 these, no other product ivhatever. 

 The elements of 



9 at. choleic acid 

 9 at. urea 

 3 at. ammonia 

 60 at. carbonic acid 



5 at. proteine" 

 15 at. starch 

 12 at. water 

 5 at. oxygen 

 In detail — 

 5 at. proteine, 5 (C48N6H36O14) = C040N30H180O-0 

 15 at. starch, 15 (Cj2 HioOio) = C190 H150O150 

 12 at. water, 12 ( HO ) = Hjo O12 



5 at. oxygen = O5 



The sum is = C400N30H340O037 



and — 

 9 at. choleic acid, 9 (CsgN H33O11) = C340N9 H09-O99 



9 at. urea, 9 (C, N,H4 O. ) = Cig NigHgg Oig 



3 at. ammonia, ... 3 ( N H3 ) = N3H9 

 60 at. carbonic acid, 60 (C 02) = Cgo O 



120 



The sum is = C420N30HJ12O237 



The transformation of the compounds of proteine 

 present in the body is effected by means of the 

 oxygen conyeyed by the arterial blood, and if the 

 elements of starch, rendered soluble in the stomach, 

 and thus carried to eyery part, enter into the newly 

 formed compounds, we haye the chief constituents 

 of the animal secretions and excretions ; carbonic 

 acid, the excretion of the lungs, urea and carbonate 

 of ammonia, excreted by the kidneys, and choleic 

 acid, secreted by the liyer. 



Nothing, therefore, in the chemical composition 

 of those matters which may be supposed to take a 



