trate. 



404 SALTS 



transparent and colourless salt, which crystallizes 

 in rhombic prisms, with angles of about 74 and 

 106. I formed it by accident some years ago. 

 When thrown into water it is decomposed, per- 

 oxide of mercury remaining. When heated, it 

 becomes first opaque, then yellow, and is at last 

 dissipated. Its constituents are as follows : 



1 atom nitric acid . 6*7 5 



1 atom peroxide of mercury 27 



33-75 



4. Dipernitratc of mercury. This salt was 

 examined by M. Grouvelle, who informs us that 

 it is anhydrous, and composed of 



1 atom nitric acid . 6-75 



2 atoms peroxide of mercury 54- 



60-75 * 

 20. SALTS OF SILVER. 



The only good solvent of silver is nitric acid. 

 The combinations of the oxide of silver, with 

 most of the other acids, are insoluble in water, 

 or at least require a great deal of that liquid to 

 dissolve them. 



Nitrate, i. Nitrate of silver. This well known and 

 beautiful salt crystallizes in rhombs, which are 

 usually flat ; and the angles of the large face, 



* Ann. de Chim. et de Phys. XIX. 140. 



