CONTAINING POTASH. 43,5 



the air. Its specific gravity is 2'26i. Its con- 

 stituents, from the analysis of Proust, seem to be 



1 atom sulphate of potash 1 1 

 1 atom sulphate of nickel 9-25 



f) atoms water . . 6-?5 



8. Potash-sulphate of manganese. This salt Potashs i- 



ptiate of 



crystallizes in thin rhombic plates, having a fine manganese, 

 flesh colour. It is not altered by exposure to 

 the air. Its constituents are 



1 atom sulphate of potash 1 1 



1 atom sulphate of manganese 9*5 

 5 atoms water 5-625 



26-125 



It is therefore a combination of the two salts 

 with the water of crystallization contained in the 

 latter. 



9. Potash-sulphate of zinc. This salt crystal- 

 lizes in long flat rhomboids with angles of 75 zinc - 

 and 1 05. Its taste is similar to that of sulphate 

 of zinc ; it is not altered by exposure to the air. 

 Its constituents are 



J atom sulphate of potash 

 1 atom sulphate of zinc 

 7 atoms water 



29-125 



