392 ZINC, CADMIUM, LEAD, &c. 



1 atom sulphuric acid 5 

 1 atom oxide of cadmium 8 

 4 atoms water . 4-5 



17'5 







I placed an exceedingly concentrated solution 

 of sulphate of cadmium, along with sulphuric 

 acid, under the exhausted receiver of an air 

 pump. Instead of crystallizing, the liquid de- 

 posited a white, hard, shapeless crust, similar in 

 appearance to enamel. When a solution of 15-25 

 grains of this crust was mixed with a solution of 

 13'25 grains of chloride of barium, a double de- 

 composition took place; and after the sulphate 

 of barytes had subsided, the supernatant liquid 

 was tested with sulphate of soda and muriate of 

 barytes, but was not affected by either. Hence 

 the constituents of this crust are 



1 atom sulphuric acid 5 



1 atom oxide of cadmium 8 



2 atoms water . 2 '2 5 



15-25 



Sulphate of zinc has the property of being de- 

 posited in the same way, as was shown in the 

 first section of the third chapter of this work. 



Several of the other salts of cadmium were 

 likewise analyzed. The results, which will be 

 seen in a subsequent chapter, all coincide to 



