125° 
mental electric potential it is obvious that the polarisation pheno- 
mena should be discussed in connection with the formula that holds 
for the “exp. electric potential” in the case that we have to do with 
a non-metal. This formula is as follows: 
or c eea aaas ce 
2 (V7) 
in which: 
(N77) 
(67) 
From (7) and (8) follows: 
(N* ) (6,)° 
Se a 
MO) 
lt has further been shown just now that with anodie polarisation 
(Op) decreases and (Np) increases; it follows therefore from this 
that in this case the quotent of solubility must increase, and the exp. 
electrical potential of the non-metal will therefore become more strongly 
positive. 
For cathodic polarisation the quotient of solubility decreases, hence 
the experimental electrical potential of the non-metal becomes less 
strongly positive. 
Amphibious Elements, 
As has already been said the amphibious elements are characte- 
rized by this that they send both positive and negative ions into 
solution. 
If such an element is made anode, positive ions can go into solu- 
tion, or negative ions can be deposited from the electrolyte on the 
anode, or the two processes can take place simultaneously. 
[f the element is made cathode, positive ions can be deposited on 
the electrode, or negative ions can go into solution, or the two 
processes can take place side by side. 
The closer study of these amphibious elements, which we hope 
soon to undertake, following the new theory on the electromotive 
equilibria, will probably give a deeper insight into the character of 
these so remarkable elements. 
Laboratory for General and Anorganic 
Chemistry of the University. 
Amsterdam, April 10% 1919. 
