OF CADMIUM. 363 



opaque glass, and weighed 18*63 grains. From 

 this experiment I consider it as a compound of 



1 atom phosphoric acid 3-.5 



1 atom oxide of cadmium 8 



1 atom water 1-12.5 



12-625 



There was about one-third of an atom of sur- 

 plus water, which was of course hygrometrical. 



5. Arseniate of cadmium. When arseniate of A 

 soda is added to a solution of nitrate of cad- 

 mium, a white precipitate falls, at first very bul- 

 ky, but in a few hours it contracts much in size. 

 This salt is a white tasteless powder, which is 

 insoluble in water. 21*84< grains of this salt 

 dried in the open air, when exposed to a pretty 

 strong red heat, were reduced to 20*01 grains ; 

 hence, 15*75 grains of the anhydrous salt must 

 unite to 1 *44 grains of water to be brought into 

 the state of the precipitated salt dried in the 

 open air. The constituents of this salt then are 



1 atom arsenic acid 7'75 



] atom oxide of cadmium 8 



1 atom water 1-125 



16-875 



The 0*315 of superfluous water was of course 

 mechanically lodged among the particles of the 

 salt. 



16 



