OF MANGANESE. 349 



When the solution is concentrated rather too much 

 for crystallization, a white crust is deposited upon 

 the bottom of the vessel : this crust is rather dif- 

 ficultly soluble in water, and is a compound of 

 1 atom of the anhydrous salt with 3 atoms of 

 water. 



i>. Nitrate of manganese. This salt is not Nitrate, 

 easily obtained in regular crystals ; its colour is 

 similar to that of the carbonate ; when exposed 

 to the air it speedily deliquesces. Its constitu- 

 ents are 



1 atom nitric acid . . 6-75 



1 atom protoxide of manganese 4-50 

 7 atoms water . . . 7'875 



19-125 



3. Carbonate of manganese. This is a white Carbonate, 

 tasteless powder, insoluble in water ; when kept 

 for some time it is partly converted into black 

 oxide of manganese. Its constituents, accord- 

 ing to the analysis of Dr. Forchhammer, are as 

 follows : 



1 atom carbonic acid . . 2 '75 

 1 atom protoxide of manganese 4-5 

 1 atom water 1-125 



8-375 



I find, that when it is merely dried in the open 

 air, without any artificial heat, it contains 2 atoms 



