36 



ANIMAL ACIDS CONTAINING AZOTE. 



The following table exhibits the result of the different ultimate 

 analyses of uric acid : 



100-00 100- 100- 100- 100- 



If we leave out Berard's analysis, because his hydrogen differs 

 so much from all the others, the mean of these analyses gives, 

 Carbon, . 38-16 

 Hydrogen, .- 2-27 

 Azote, . 34.45 

 Oxygen, . 25-12 



100-00 



Now the number of atoms which agrees best with this mean, 

 and which approaches the atomic weight determined by Bracon- 

 not, is the following : 



10 atoms carbon, . 7-5 or per cent. 35*72 

 4 atoms hydrogen, 0-5 ... 2-38 



4 atoms azote, . 7-0 ... 33-33 

 6 atoms oxygen, . 6-0 ... 28-57 



21-0 100-00 



The carbon does not agree with the above mean, but it almost 

 coincides with the result of Mitcherlich's analysis. The quantity 

 of oxygen is above the mean ; the number of atoms of oxygen 

 deduced from that mean should only be 5 instead of 6. 



I am disposed, in consequence of these discrepancies, to adopt 

 the analysis of Dr Prout as the most exact. It leads to the fol- 

 lowing atomic constitution : 



11 atoms carbon, 8-25 or per cent 37-94 

 4 atoms hydrogen, = 0'5 ... 2-30 



4 atoms azote, = 7-0 ... 32-18 



6 atoms oxygen, = 6-0 ... 27-58 



21-75 100-00 



Wbhler and Liebig have adopted the formula, C 10 H 4 Az 4 O c , 



