LITHOFELLIC ACID. 25 



with oxide of copper by MM. Ettling and Will. 573*5 parts of 

 it gave 1480-5 of carbonic acid and 558-5 of water. Hence tbe 

 constituents are 



Carbon, . 70-41 



Hydrogen, . 10-82 



Oxygen, . 18-77 



100* 



From an analysis of lithofellate of silver they have been induced 

 to represent its constitution by the formula C 42 H 38 O 8 = 44.25. 

 If we calculate from this formula we get 



42 carbon = 31'5 or per cent 71-19 



38 hydrogen = 4'75 . 10-73 



8 oxygen 8 . 18-08 



44-25 100-00 



Were we to adopt the atomic weight of 38*125 derived from 

 Groebel's analysis of the soda soap, we might consider lithofellic 

 acid as composed of C 36 H 33 O 7 = 38-125 a formula which 

 approaches the numbers obtained by the analysis of Ettling and 

 Will pretty nearly. Wdhler gives the formula C 40 H 36 O 8 = 

 42*5, which agrees very closely with his analysis. He obtained 



Carbon, . 70-83 



Hydrogen, . 10-60 



Oxygen, . 18-57 



lOOf 

 The lithofellate of lead was composed of 



Acid,. . . 68 or 44.6 



Oxide of lead, . 32 or 21 or 1J atom 



100 



This would make the atomic weight of the acid 44-6. The sil- 

 ver salt, according to Wohler's analysis, is composed of 

 Lithofellic acid, . 75 or 43-5 

 Oxide of silver, . 25 or 14-5 



100 

 * Ann. der Pharm. xxxix. 244. f Ibid. xli. 154. 



