3,50 SALTS 



of water. 100 grains of this carbonate were dis- 

 solved in nitric acid, the solution was evaporated 

 to dryness, and heated till the acid was destroyed, 

 and black shining deutoxide of manganese re- 

 mained behind. It weighed 50*55 grains, equi- 

 valent to 4,5*495 grains of protoxide, which would 

 require for saturation #7*801 grains of carbonic 

 acid ; consequently, the constituents of the car- 

 bonate must have been 



Carbonic acid . 2?-8 or 2'75 



Protoxide of manganese 45-5 - 4-50 

 Water . . . 26-? - 2-25 + 0-375 



100-0 9-5 



The 0'375 of water above the 2 atoms, was pro- 

 bably mere hygrometric water, as no attempt 

 was made to free it from all water mechanically 

 lodged among its particles before dissolving it in 

 nitric acid. 



Phosphate, 4. Phosphate of manganese. This salt may 

 be obtained by mixing together solutions of sul- 

 phate of manganese and phosphate of soda. 

 The phosphate of manganese precipitates in the 

 state of a white powder, which may be collected 

 on a filter, washed and dried in the open air ; it 

 is tasteless, insoluble in water, and produces no 

 alteration on vegetable blues. 10*7 grains of this 

 salt, when heated to redness, give out 2*7 grains 

 of water, and leave 8 grains of anhydrous phos- 



