CONTAINING POTASH. 



From the colour of this salt one would be 

 tempted to consider it as a compound of 



1 atom oxalate of ammonia 6-625 

 1 atom hydrate of copper 6-125 



12-75 



But the escape of the ammonia, when the salt is 

 exposed to the air, will not admit of that ex- 

 planation. It is probably a triple compound of 

 the acid with the two bases at once. 



20. Pulverulent ammonio-oxalate of copper. 

 This is a blue powder like small, formed by Vo- 

 gel of Bareuth, by putting a greater quantity of 

 oxalate of copper into ammonia than that liquid 

 is capable of dissolving. This salt is anhydrous, 

 and its constituents, according to Vogel's ana- 

 lysis, are as follows : 



1 atom oxalate of ammonia 6-625 



1 atom dioxalate of copper 14-5 



21-125 



II. OF COMPOUND SALTS CONTAINING POTASH. 



1. Potash-sulphate of magnesia. This salt 

 crystallizes in transparent rhombs. The taste 

 weak but sensibly bitter ; its specific gravity is 

 2-112; it is not altered by exposure to the at- 

 mosphere. Its constituents are 



16 



