IV. 



MERCURY. SILVER. 



Mercuric sulphide, precipitated 

 from mercuric solutions by hydrogen 

 sulphide. 



Mercuric sulphide, Cinnabar. 



Yellow mercuric oxide, precipi- 

 tated from mercuric solutions by po- 

 tassium hydroxide. 



Red mercuric oxide, obtained by 

 heating mercuric nitrate. 



Mercurous oxide, precipitated 

 f rom mercurous solutions by potassium 

 hydroxide. 



Silver sulphide, precipitated from 

 silver solutions by hydrogen sulphide. 



Mercuric iodide, precipitated 

 from mercuric solutions by alkali 

 iodides. 



Mercurous iodide, precipitated 

 from mercurous solutions by alkali 

 iodides. 



Mercuric solutions with ammo- 

 nium hydroxide. Mercurous solu- 

 tions with soluble chlorides. Silver 

 solution* with soluble chlorides. 



