260 



KOLLOCK AND SMITH— EFFECT OF 



[November 3, 



From a neutral solution of the salt, under the same conditions, 

 the copper was completely precipitated in eight minutes. 



Cadmium. 



In the presence of one cubic centimeter of sulphuric acid, 0.25 

 gram of cadmium was deposited in ten minutes. The current 

 equaled two amperes, and the pressure from 4 to 4.5 volts. 



Fig. 3. Cadmium. 



In 2.5 mimites, 0.1720 gram of cadmium was deposited. 

 " 5 " 0.2418 " 



" 7.5 " 0.2480 " 

 "10 " 0.2500 " 



(Figure 3, Curve i.) 



When two cubic centimeters of acid were present, hydrogen 

 sulphide, after fifteen minutes, gave a faint yellow color to the 

 solution from the cell. In eighteen minutes there was no color on 

 testing the liquid in the same way. 



