ANIMAL AMIDES. 



According to these imperfect analyses, the two salts consist of, 



From Casein. From Albumen. 



Carbon, . 41-36 . 37-08 



Hydrogen, . 5-27 '. 4-66 



Azote, . 14-08 



Oxygen, .(> 13-26 



Sulphuric acid, 6*35 



Oxide of silver, 19-68 



100-00 

 Mulder considers the salt as composed of, 



1 atom protein, . C 40 H 31 Az 3 O 12 



1 atom sulphuric acid, . SO 3 



1 atom oxide of silver, . Ag O 



He prepared sulpho-proteate of copper, and subjected it to 

 analysis. Its constituents were, 



Carbon, . 32-17 



Hydrogen, . 4-58 

 Azote, . . 9-87 



Oxygen, . 16-85 



Sulphuric acid, . 11-68 



Oxide of copper, . 25-85 



101-00 

 He considers it as composed of 



1 atom protein, . C 40 H 31 Az 5 O 12 



2 atoms sulphuric acid, . 2 (SO 3 ) 

 5 atoms oxide of copper, . 5 (Cu O) 



It is, in his own opinion, (C 40 H 31 Az 5 O 12 + SO 3 ) -f (2 Cu 

 O + SO 3 ) + (3 CuO + 3 Aq). 



I think it unnecessary to enter into any examination of these 

 results, because the conclusions are obviously conjectural. 



Tannate of Protein. When albumen is mixed with water and 

 the liquid passed through a filter, if we mix it with a solution of 

 pure tannin, a white flocky precipitate falls, which is difficult to 

 wash. When dried at 266 it still retains its white colour, and 

 the tannin is unaltered, if the drying be cautiously conducted. 

 It was subjected to analysis by Mulder.* It contained two per 



* Ann. der Pharm. xxxi. p. 129. 



