140 RELATION OF BLOOD TO URINE. 



1 at. uric acid C 10 N 4 H 4 O 6 -j 



4 at. water 1 ^ L/ 2 at - urea C 4 N 4 H 8 O 4 



6 at. oxygen) __^J ^ &t ' Carb nic add C _! ^ 



C 10 N 4 H 8 16 C 10 N 4 H S 16 



34. The urine of the herbivora contains no uric 

 acid, but ammonia, urea, and hippuric or benzoic 

 acid. By the addition of 9 atoms of oxygen to the 

 empirical formula of their blood multiplied by 5, we 

 obtain the elements of 6 at. of hippuric acid, 9 

 at. of urea, 3 at. of choleic acid, 3 at. of water, and 

 3 at. of ammonia ; or, if we suppose 45 atoms of 

 oxygen to be added to the blood during its meta- 

 morphosis, then we obtain 6 at. of benzoic acid, 

 13^ at. of urea, 3 at. of choleic acid, 15 at. of car- 

 bonic acid, and 12 at. of water. 



6 at. hippuric acid, 6 (C 18 N H 8 O 5 ) = C 108 N 6 H 48 O^ 



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



3 at. choleic acid, 3 (C^N HaAO = C 114 N 3 H^ O 33 

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

 3 at. water 3 ( H 3 O 3 ) = H 3 O 3 



The sum is 



or 

 5 

 6 at. benzoic acid 6 (C 14 H 5 O 3 ) = C^ H^ O 18 



27/ 2 at. urea 27 (C NH 2 O ) = C^N^H^O^ 



3 at. choleic acid 3 (C^NH^On) = C 114 N 3 H,,,, O-a 

 15 at. carbonic acid, 15 (C O 2 ) = C 15 Oao 



12 at. water 12 ( H O ) = H 12 O I2 



The sum is 



35. Lastly, let us follow the metamorphosis of 



