++ | 
where = is related to the change of the number of Hgg-ions in the 
@ 
bordering layer of the solution. So equation (2) would have been: 
AH 0. ese (127) 
0 @ 
Let us pay attention to the fact, that in (2) and also in (267s) 
the surface-density of the charge @ is always taken positive ; A can 
be + or —, but @ is always +. 
Formula (2) has already been found by Pranck !), though in another 
form and deduced in a somewhat different manner. We shall see 
dp . 
how great the importance of the supplementary term en is for the 
explanation of the asymmetry of the capillary-curve. 
Before we proceed to express y as a function of A, we will show 
how the usual expression of NERNsT may be deduced from equation 
2). To that purpose the term op whose value is small, compared 
p Pp dw’ ? Pp 
with the two other terms, is neglected. So we find: 
4); 
Fo ee. 
2 & 
But for 4). we may write : 
Uig = Mg ty = (tg! + RT loge) — yy 
where, when the solutions are diluted, 442’ will be independent of 
++ 
the concentration of the Hgs-ions. [As we mentioned above, the 
solubility of Hgs SO, (or Hg, Cls) is so small, that the solutions will 
always be extremely diluted]. If we write: 
| tij—-uz = RT log C, 
then 
c 
tig = RT log G 
1) WIEDEMANN's Annalen 44, 385 (1891), 
