685 



From this experiment the important conclusion could, therefore, 

 be drawn that the two passive states are the same. 



At the end of this series of experiments we may finally already 

 conclude that from the fact that where anodic enobling was observed, 

 also ore enobling could be demonstrated, follows that the two 

 phenomena must be explained from one and the same point of view, 

 as the theory of allotropy makes possible. 



2. As the course followed bade fair to lead to success, we have 

 changed our mode of procedure so that we could expect still greater 

 effects. 



Our purpose was now to attack the metals while they were im- 

 merged in the salt-solutions, and measure the potential with respect 

 to the calomel-electrodes at the same time. 



Very effective in this respect is bromic water, with which in some 

 cases enormous effects were obtained, and a catalytic influence was 

 also discovered of Br-ions for Ni. 



Nickel. 



The first experiment was made with a screwshaped Ni-electrode, 

 which was kept in rapidly rotatory motion by a motor, and served 

 therefore at the same time as stirrer. The result was as follows. 



Ni-electrode in 100 cm3 '/lo N. Ni (N03)2-solution. 



Observations 



Potential of the Ni-electrode with 

 respect to VioNorm. Calomel-electrode 



