( 188 ) 
The same results are obtained by considering the equation 
RT, Pr (1—2) 
ise Teoria 
a. When the two metals form homogeneous mixtures in all pro- 
portions, the curves will therefore possess the 
4 
Fig. 2, 
general form shown in figure 2. 
ie B The points on these curves, which are 
situated on the same horizontal line, are co- 
existing phases. The ordinate of the points 
gives the potential difference at the plane of 
separation. 
Although it is not impossible, a maximum 
or minimum will rarely occur, unless the 
> 
* solution tensions of the two components 
Ps 1 ay i erv 1 4 
Ee differ very little. 
PitPs 4. If the metals are not homogeneously 
miscible in every proportion, and the series of mixtures is therefore 
discontinuous, the two metallic phases, which are in equilibrium with 
each other (the end points of the break), will also be in equilibrium 
with the same electrolyte. The potential in this electrolyte must be 
the same for both metallic phases, for if such were not the case, a 
current might be generated and the equilibrium would be disturbed. 
According to whether the potential difference in this non-variant 
equilibrium is greater than those of the pure metals in solutions of 
their salts or intermediate between them, the figures 3 or 4 are 
obtained. 
Fig. 3. Fig. 4. 
—> v or ES (OT = 
PFP: PP. 
C and PD are the two metallie phases in equilibrium with each 
other. Mis the coexisting electrolyte. 
The case of fig. 3 becomes identical with that of fig. 1 if Cand D 
