(12) 
ae. " : 
If we put: uw", de, + we dy, = du, and «ny, de, + w'y dy, = Oy yee 
then we may write this equation in the following form: 
0 d log (1 +2, (e 5 cn 1—]) 4. U, (e” ej vds, — yd’, 
Hr Wits 
or C= log dt, (e i kart) = Yy (e =); = (ay, Ux —Y Wy, 
Applying equation (3) of p. 5 it would have been possible to 
obtain this integral for the projection of the curves of equal pres- 
sure in a simpler way. In this equation, where the index 2 indicates 
ei a rare vapour phasis, we equate «,, and w'‚, to zero and u, to 
lo 1; so we get: 
a Ar as 5 
log Aar) Pl Hr Wy = log (1—w,—y,) log A + 1 
MRT 
from which follows: 
A a ao ru — - Bay, — 2s x Yi y, —1 
MR en th 
In connection with the value I have given before 
) 1—z 
I Sel | po te 
HO pin sap eee ee at Me 
This equation may be written in the following form: 
log a log} pla ‚(e im sl) tye OM — 1) Yan U Ur IY Wy, == (7) 
Already long ago I have given a corresponding equation for a 
binary system. It may also be found Cont. H, p. 146, though in 
a somewhat modified form. I have shown for the case of a binary 
mixture, that such an equation in some cases may represent a straight 
line, but that it in other cases represents a curve, which at certain 
values of 7, presents a maximum value for p. The intermediate 
forms may also occur of course. The course of the function u being 
at least approximately determined by that of the functions 7, and pe, 
knowledge of the dependence of these functions on a and y would 
be required for an adequate discussion of equation (7). This would 
be possible according to my equation of state putting 
8 a Leia 
1 Se and Per = SS . 
A 27 b 27 b? 
Liter nig a lees 
But as the quantities En and De depend rather intricately on 2 and 4 
) ge 
this would lead to an elaborate discussion, and I have not yet sue 
