IN THE URINE OF HERBIVORA. 151 



carnivora, then the blood of the former must yield, 

 as the last products of the metamorphosis, from all 

 the organs taken together, choleic acid, uric acid, 

 and ammonia (see p. 136) ; and if we ascribe to the 

 uric acid an action similar to that of the benzoic 

 acid in Ure's observation such, namely, that the 

 further transformation, owing to the presence of 

 this acid, assumes another form, the elements of the 

 uric acid being incorporated in the final products 

 it will appear, for example, that 2 at. of proteine, 

 with the addition of the elements of 3 at. of uric 

 acid and 2 at. of oxygen, might give rise to the pro- 

 duction of hippuric acid and urea. 



2 at. proteine, 2 (C^N^O,,) == C % N^ 



3 at. uric acid, 3 (C 10 N 4 H 4 O G ) = C^ N 12 H 12 O 18 

 2 at. oxygen O 2 



Thesumis ............... 



J6 at. hippuric acid, 6 (C 18 N H 8 O 5 ) = C 108 N 

 \9 at. urea ......... 9 (C 2 N 2 H 4 O 2 ) = C^N 



Thesumis 



50. Finally, if we bear in mind, that, in the her- 

 bivora, the non-nitrogenised constituents of their 

 food (starch, &c.) must, as we have shewn, play an 

 essential part in the formation of the bile ; that to 

 their elements must of necessity be added those of 

 a nitrogenised compound, in order to produce the 

 nitrogenised constituents of the bile, the most strik- 

 ing result of the combinations thus suggested is 

 this, that the elements of starch added to those of 



