348 SALTS 



1 atom tartaric acid 8-25 



1 atom protoxide of cobalt 4-25 



2 atoms water . 2-25 



14-75 



All the salts of cobalt, if we can judge from 

 the preceding list, contain water of crystalliza- 

 tion. But the quantity is in general less than 

 in the salts of nickel. The carbonate contains 

 only 1 atom the phosphate, oxalate, tartrate, 

 and chromate contain 2 atoms the bisulphate 

 3 the arseniate 4 the nitrate 6 the sulphate 

 7, and the biantimoniate 8 atoms. 



13. SALTS OF MANGANESE. 



The salts of manganese are most of them 

 agreeable to the eye, particularly the sulphate 

 and the acetate. They are transparent, and have 

 a slight tinge of flesh red, or rather violet red, 

 which adds greatly to their beauty. 

 Sulphate, 1. Sulphate of manganese. This salt crystal- 

 lizes in very flat rhombic prisms, the greater an- 

 gle of which is about 148 ; its taste is similar 

 to that of glauber salt, and it may be substituted 

 for that salt as a purgative. Its constituents are 



1 atom sulphuric acid 5 



1 atom protoxide of manganese 4-5 

 5 atoms water . . 5-625 



15-125 



