HIPPURIC AND CHOLEIC ACIDS. 59 



Uramilic acid, . 23-08 



Oxide of silver, . 76-92 



100- 



If we admit that in uramilic acid the three atoms water substi- 

 tuted for ammonia and the two atoms of water in the two atoms 

 of uramile are replaced by 5 atoms of oxide of silver, the con- 

 stitution of the salt would be, 



Acid, . . . 31-375 or per cent 30-29 

 Oxide of silver, . 72-5 69*71 



100- 



Now this does not deviate very far from the result of the analy- 

 sis of uramilate of silver. 



SECTION XI. OF HIPPURIC ACID. 



This acid has been described in the Chemistry of Vegetable 

 Bodies, (p. 46.) No additional facts respecting this acid, so far 

 as I know, have been discovered since the publication of that 

 volume, except the formation of hippuric ether, an account of 

 which will be given in the appendix. 



Its constitution is C 18 H 8 Az O 5 = 21-25. 



SECTION XII. OF CHOLEIC ACID. 



This acid constitutes the greatest part of ox bile. It had been 

 considered as an acid by the older chemists and physiologists. 

 Berzelius gave it the name of biliary matter, and Thenard that 

 of picromel. But from the recent analysis of ox bile by M. De- 

 ma^ay* it appears that the old opinion advanced by Cadet, that 

 bile is of a soapy nature, is after all, the true one. Dema^ay 

 has shown that the essential constituents of bile are soda, and an 

 oily acid to which he has given the name of choleic.} This acid 

 may be obtained pure from ox bile by the following process : 



Evaporate the bile to dryness over the steam-bath and digest the 

 dry residue in alcohol. The choleate of soda will be dissolved, while 

 the mucus mixed with the bile is left behind. Distil off the al- 

 cohol by 'a steam heat, and dissolve the residue in water. To 



* Ann. de Chim. et de Phys, Ixvii. 177. 

 f From ox, bile. 



