IRON. COBALT. NICKEL, 



PLATE I. 



Ferrous sulphide, precipitated from 

 ferrous solutions by ammonium sulphide. 



Ferrous hydroxide, passing into 

 ferric hydroxide. Ferrous solutions precipi- 

 tated by alkali hydroxides. 



Ferric hydroxide, precipitated from 

 ferric solutions by alkali hydroxides. 



Ferrous solutions, precipitated by 

 potassium ferrocyanide. 



Ferric solutions, precipitated by 



potassium ferrocyanide, or, Ferrous 



solutions precipitated by potassium 

 ferricyanide. 



Ferric solutions, treated with alkali 

 sulphocyanates. 



Cobaltous carbonate, precipitated 

 from cobaltous solutions by sodium 

 carbonate. 



8 



Nickelous carbonate, precipitated 

 from nickelous solutions by sodium 

 carbonate. 



A ftoen &Co LM Babuiion. . ltd 



