Effects due to Magnetization. 



449 



The electrodes were magnetized before being introduced 

 into the solution, so as to protect the point from the begin- 

 ning. In order to prevent the influence of the rise of temper- 

 ature due to the heating of the field coils of the electromag- 

 net, the whole cell was packed with cotton wool between the 

 poles. As Gross and Andrews observed the temperature 

 effect was small, the solution rising but 0*7° C. in half an hour. 



FlG.I 



fJOQ& tZOt'oH. 



Fig. Z. 



Fig. 3. 



The curve fig. 1 (II) shows the result of these observations. 

 It is seen that the original current was as before to the point 

 electrode, and about the same in value. This reversed after 

 forty-five minutes, and rapidly increased to approximately 

 twice its original value at the end of one hour and twenty 



