262 



KOLLOCK AND SMITH— EFFECT OF 



[November 3, 



In 5 minutes, 0.0858 gram of iron was deposited. 

 10 



15 

 20 



30 



35 



Fig. 4. Iron. 



In the presence of three cubic centimeters of acid, in twenty-five 

 minutes, .069 gi^m of iron was found in the mercury. Four cubic 

 centimeters of acid were not enough to completely hold up the iron. 



Nickel. 



In fifteen minutes the nickel solution, containing one cubic centi- 

 meter of sulphuric acid, became colorless. It required twenty 

 minutes, however, to remove the last traces of metal. 



In 5 minutes, 0.1404 gram of nickel was deposited. 

 "10 " 0.2070 " 

 «I5 " 0.2370 " 

 "20 " 0.2476 " 

 "25 " 0.25 1 1 " 



(Figure 5, Curve i.) 



