ALBUMENS AND OTHER ORGANIC SUBSTANCES. CREIGHTON. 71 



III. DISCUSSION OF RESULTS. 



From the experiments described, it will be seen that 

 albumens, as well as the closely related albuminoid gelatine, 

 tend to prevent certain reactions of ferric chloride, potassium 

 ferricyanide, and soluble Prussian blue; while on the other 

 hand, the presence of albumen or gelatine does not appear to 

 hinder reactions with ferrous ammonium sulphate or potassium 

 ferrocyanide. The prevention of reactions of iron salts by 

 albumen or derived proteins, such as gelatine, seems to be closely 

 associated with the state of oxidation of the iron; for ferric 

 chloride, potassium ferricyanide 



K 



Til 



and soluble Prussian blue 



each contain at atom of trivalent iron. In potassium ferri- 

 cyanide the trivalent iron forms part of the anion Fe (CN) 6 HI . 



