ANIMAL ACIDS CONTAINING AZOTE. 



This is obviously 1 atom acid, . C 6 H 4 Az 2 O 8 



1 atom ammonia, . H 3 Az 



C 6 H 7 Az 3 O 8 



When solutions of oxalurate of ammonia and chloride of cal- 

 cium are mixed, brilliant and transparent crystals of oxalurate 

 of lime are gradually deposited. With excess of lime another 

 precipitate is obtained in a granular and yet gelatinous form. 

 This last compound may be prepared by supersaturating oxalu- 

 ric acid with lime, or by pouring some ammonia on crystallized 

 oxalurate of lime. It is soluble in a great quantity of water, 

 and very soluble in dilute acids, even in acetic acid. 



Oxaluric acid is obviously a combination of two atoms oxalic 

 acid with one of urea. 



Two atoms oxalic acid, . C 4 O 6 



One atom urea, . C 2 H 4 Az 2 O 2 



Constituting an atom of oxaluric acid, C 6 H 4 Az 2 O 8 

 It deserves attention that the oxalate of urea possesses also 



acid characters. 



One atom of uric acid + 4 atoms oxygen may be resolved 



into 1 atom urea, 2 atoms carbonic acid, and 1 atom anhydrous 



parabanic acid, provided we adopt the constitution of uric acid 



given by Liebig. 



1 atomuricacid C 10 H 4 Az 4 O 6 1 f l atom u !" eaj . , 9* H " Az " * 



4 atoms oxveen O 4 f = 1 2 carbomc acid C 



tl parabanic acid C 6 Az 2 O 4 



C 10 H 4 Az 4 O 10 C 10 H 4 Az 4 O 10 



Alloxane, heated with an excess of nitric acid, combines with 

 two atoms of oxygen, and may be resolved into carbonic acid, 

 parabanic acid, and water. 



1 atomalloxane C 8 H 4 Az 2 O w 1 f Satomscarb. acid C 2 O 4 



2 do. oxygen O 2 / =: V Pa^banic acid C 6 AzK* 



1-4 water . H 4 O 4 



C 8 H 4 Az 2 O 12 C 8 H 4 Az 2 O 12 



