967 
Hg-Al, and that the melting-point line of aluminium consists of two 
branches, in consequence of the occurrence of a transition point 
lying at about 585°. 
The determination of the melting-point diagram served by way 
of orientation, and now that no compound appeared to exist, it was 
certain that the EX-figure corresponding to the ordinary temperature, 
must belong to the type I or II in Fig. 2. 
S-.. € L 
a 5 5 L 
E 
b b 
ae AL 3Hg 
Type 1. Fig. 2. Type 2. 
Assuming, as has been done before, that GiBBs's paradox is also 
applicable to the components of a mixed crystal phase present in 
diluted state, the formula’): 
0.058 “Ly 
log 
vF (MI) 
was found for the exp. electric potential. 
This formula already shows that when we first determine the 
potential of Aluminium immersed in a non-aqueous solution of an 
Al-salt, and then in an equivalent solution of an Al-salt + a Hg-salt, 
the direction of the potential change will depend on which quantity 
has decreased more, Ly or (Mr) ®). 
If (Aly) has decreased more, the potential will be more negative, 
if on the other hand (La;) has decreased more, the potential will 
have become less negative. 
It is evident that it is also possible to follow the opposite course; 
— 2,8. 
1) These Proc. XXI, N°. 4, p. 562. 
2) Lm is now not a constant quantity, but decreases with greater mercury 
content. 
63% 
