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ternary system A + 6-+ C. [Compare also “Equilibria in ternary 
systems XIII” February 1914]. The region EZ has then two limit- 
lines Ey) and Fee. The first represents the monovariant 
equilibrium B+ £-+G of the binary system B + C; the second 
the same monovariant equilibrium of the binary system A + J. 
dach of those curves may either have a point of maximum-pressure 
or not, so that we may distinguish three cases. When in the 
equilibrium £ does not occur an equilibrium Zp, then the region 
FE is situated completely within the limit-lines and it is, therefore, 
one-leafed; when an equilibrium Er occurs, then also a turning- 
line exists and the region is, therefore, two-leafed. 
Two limit-lines ah and cd may intersect one another in a point 
s (fig. 4); this means that the two equilibria Z, have the same 
pressure P, at the temperature 7’. In this case there is always a 
limit-curve ef (fig. 4), which may be situated as well above as 
below the point s. The turning-line ef may touch the curves cs 
and sb in fig. 4. 
Fig. 4. Fig. 5. 
Let us now consider the equilibrium = Z, + L, + G, in which 
L, and L, represent two liquid-phases. [In a similar way we may 
also discuss the equilibria Z, + L, + F, M, + M, + L and 
M,+ M,+ G, ete, in which M, and M, represent mixed crystals}. 
When in the equilibrium = L, + Li, + G@ the two liquids become 
identical, then a critical equilibrium exists: Ex = Lik + G. Curve 
Ex may have a form, like curve acd’) in fig. 3. When in the 
equilibrium Zp the quantity of one of the components e.g. of A, 
approaches to zero, then curve Ex has a terminating-point Lx. 4—0. 
When acd represents in fig. 38 the critical curve Ep, then the 
region E= L, + L,+ G is situated either completely within curve 
1) Compare also F. A. H. ScHREINEMAKERS, Archives Néerl. Serie IL. VI. 170 
(1901). 
