1154 
phases oi the ternary equilibrium traces, therefore, a three-phases- 
curve. Now we assume that on addition of very little of the new 
substance the two liquids and the vapour are represented by the 
points 6,6, and 6; consequently these points are situated in the 
immediate vicinity of a,a, and a; for sake of clearness they are 
drawn however in the figures on greater distance. Relating to the 
situation of the vapour-point 5 with respect to the line 6, b, we shall 
say that the three-phases-triangle 6, 6,6 turns his vapour-point in 
figs 1 and 2 away from the side YZ of the components-triangle and 
in figs 3 and 4 towards this side. 
When we represent the reaction by 
PAs Er ete Oe (he 
then is: 
Eke, Azo eer ea ees 
in wich 4, and 2, are defined by 
AAE Tani’ MA A ieee ct eee ey 
so that 4, and 4, are linear functions of y. When we consider x 
and y in (14) as running coördinates, then 2 (2.x) = 0 represents 
Fig. 3. 
