264 KULLOCK AND SMITH— EFFECT OF [Novembei 3, 



In 5 minutes, o.ioio gram of cobalt was deposited. 



"10 " O.IS39 " " * " 



"is " 0.1663 " 



"20 . " 0.1681 " 



"25 " 0.1700 " 



(Figure 6, Curve i.) 



When two cubic centimeters of sulphuric acid were present, ten 

 minutes additional were necessary for the removal of the cobalt. 



Fig. 6. Cobalt. 



In 5 minutes, 0.0859 gram of cobalt was deposited. 

 "10 " 0.1496 " 

 "IS " 0.1555 " 



"2S " 0.1669 " 



"35 " 0.1709 '' 



(Figure 6, Curve 2.) 



The ease and rapidity with which metals are precipitated upon 

 the mercury cathode naturally suggested the inquiry as to the sepa- 

 rations which were possible in this manner. The following lines 



