lUO 



In this case the metal has, accordingly, beconne ennobled, but the 

 hydrogen has become baser. 



It is now the question at what potential the three-phase equili- 

 brinm will lie. 



When the disturbance of the metal is much greater than that of 

 the hydi-ogen, the three-phase potential will most pi-obal)ly l)e less 

 negative than in case of iiitei-Jial equilibrium of metal and hydrogen 

 phase; if, however, the disturbance of the hydrogen is very great, 

 it is possible that this disturbance prevails, and that the three-phase 

 potential is moie negative than in case of internal equilibrium. In 

 the foregoing diagram, fig. 3, the former is supposed. 



It is clear how on these considerations we aj-e gradually led to 

 the case that presents it.self for Nickel. 



There the metal is disturbed, and through its exceedingly slow, 

 imperceptible generation the hydrogen is always in internal equili- 



E 



brium. In consequeiice of the exceedingly slight action the concen- 

 tration of the boundary liquid is practically not different from that 

 outside the boundary layer, so that the liquid phase of the three- 



