. 186 
of the critical end-point S + (G=L) is different in the two binary 
systems. 
So we suppose now that in the two binary systems AB and AC 
critical end-points occur, in such a way that the critical phenomenon 
appears by the side of solid B in the system AS, and by the side 
of solid C in the system AC. A meeting of a eutectic line with a 
critical end-point curve of course means this that the critical pheno- 
menon occurs at the temperature of the meeting by the side of 
two solid substances, and so it is clear that a eutectic line must 
always meet two critical end-point curves simultaneously, namely the 
critical end-point curves which belong to the solid substances to 
which the eutectic line refers. 
Let us now assume for the sake of simplicity that the melting- 
point figure of the system BC’ possesses a eutectec point. We can 
then state at once that by the side of the conglomerate of solid 
B solid C critical phenomena can appear only when the eutectic 
temperature of the system BC lies above the critical temperature of 
the component A, and the greater this difference is the greater will 
be the chance that the case in question can be realized. 
Va To get a better insight into the 
peculiarities of such a system it 
is necessary to make use of a 
ternary V, X-figure, as was used 
JA by me before. 
This V, X-figure is pretty simple 
so that it is possible to give at 
once the projection of the principal 
|Z Lines of equilibrium on the V, X- 
Z, plane of the binary system B—C. 
Below the eutectic temperature 
the V,X-figure of the system B,C 
C consists of two lines ac and bc, 
which indicate the mol. volumes 
and the concentrations of the 
vapours, which can coexist with solid B resp. solid C. 
Now it is of importance to show what eqnilibria would appear 
when as we proceed aiong the isotherm ac resp. be the deposition 
of solid C resp. of solid B did not take place. 
This case I examined before in the p, z-section for another purpose, 
and the sections discussed then quite agreed with the V, XA-fig. of 
the system B, C drawn above’). 
1) These Proc. 30 Dec. 1905. 568. 
Fig. 3. 
