CONTAINING POTASH. 439 



iirst formed by Vogel of Bareuth, by digesting 

 together binoxalate of potash and carbonate of 

 copper. When the solution is concentrated, two 

 species of salts are obtained. 



The first species crystallizes in long slender 

 six-sided prisms, which effloresce in the air. They 

 are composed of 



1 atom oxalate of potash 1 0*5 

 1 atom oxalate of copper Q-5 



4 atoms water 4-5 



24-5 



The second species forms oblique four-sided 

 prisms with rhombic bases. It has a greener 

 colour than the first species, and is not altered 

 by exposure to the air. Its constituents are 



1 atom oxalate of potash 1O-5 



1 atom oxalate of copper 9-0 



2 atoms water 2-23 



22-25 



15. Potash-tar trate of soda. This is the well Potash tar. 

 known salt formed by saturating bitartrate of soda, 

 potash with carbonate of soda and crystallizing 

 the solution. It forms large crystals, which seem 

 to have for a primary form, a right prism with a 

 rectangular base ; it has a bitter taste, is very 

 soluble in water, and effloresces slightly, when 

 exposed to the air. Its constituents are 



E e i 



