OF MANGANESE. 3,51 



phate of manganese. If we admit tlie excess of 

 water (rather less than half an atom) to be hy- 

 grometric, the constituents of the salt will be 



1 atom phosphoric acid . 3-5 



1 atom protoxide of manganese 4-5 



2 atoms water . . . 2-25 



10-25 



5. Arseniate of manganese. This salt may 

 be obtained by mixing solutions of sulphate of 

 manganese and arseniate of soda ; it is a white 

 tasteless powder, insoluble in water, and produc- 

 ing no alteration on vegetable blues. 23*5 grains 

 of this salt being exposed to a red heat lost 

 grains ; hence, the constituents are 



1 atom arsenic acid . 7' 7 5 



1 atom protoxide of manganese 4-5 



10 atoms water 11-25 



23-5 



The binarseniate of manganese is soluble and 

 easily formed. I have made no experiments to 

 determine its composition. 



6. Chromate of manganese. Protoxide ofchromate, 

 manganese decomposes chromic acid, so that the 



salt does not exist. 



7. Acetate of manganese. This is a beautiful Acetate, 

 salt which crystallizes in flat rhombic prisms, 



