( 563 ) 
ments of Parmar’), SMrrm®) and many others, and so the old 
theory of von HeLMmnoutz, that of the so called “charging current’ 
has been overthrown. The electromotive forces, calculated according 
to the old theory, do not agree at all with the experimental data, 
whereas those, calculated according to the new theory, agree quite 
well. 
II. We will now deduce two relations. First one, giving 4 as 
a function of the concentration of the Mans in the solution; in 
the second place one, giving y as a function of A. | 
1e In order to find the conditions of 
equilibrium between a metal (mercury) 
and a solution (in which the ions of 
the metal must occur), we imagine a 
see 
Hgs-ion to pass the separating surface 
in the direction from the solution 
towards the mercury. The mercury is 
Fig. 2. thought +, the solution —. The 
++ 
molecular thermodynamic potential of Hg, in the solution be ws, 
and that of 2Hg in the mercury be wij, then the change of the 
thermodynamic potential per gram-ion will be: 
fa Sears oh 
As in every gram-ion 2e, electric units are stored, the change of 
++ 
the thermodynamic potential for the passage of a quantity Hg, 
corresponding with de electric units, will be: 
Pi ree 7, 
er ray EAL RTL SORE 
The electric potential of the liquid being represented by Vs, and 
that of the mercury by Vi, the passage of de electric units through 
the bordering layer will work a change of the electric energy 
equal to 
ees de LR ka a 
1) Z, f. Ph. Ch. 25, 265 (1898); 28, 257 (1899) ; 36, 664 (1901). 
2) Id. 32, 433 (1900). 
