1544 
When in fig. 2 (ID) the equilibrium ()=2 4344 5 traces curve 
(1) starting from the invariant point, then consequently the partition 
of the regions is first indicated by reaction (1). Therefore, as is 
also drawn in fig. 2 (ID), towards the one side the regions 234 and 235, 
towards the other side: the regions 245 and 345 start from curve (1). 
When on curve (1) we remove further from the invariant point, 
then instead of reaction (1) now reaction (2) may occur. The region 
235 will no more go now from this part of the curve (1) towards 
the right as is drawn in fig. 2 (II), but it will go towards the left. 
Consequently this region will show a peculiarity, to which we shall 
refer later. 
When the equilibrium (1) traces curve (1) in fig. 2 (ID, then 
point 5 traces in the concentration-diagram a curve, which we shall 
call curve 5%; when the other phases have also a changeable com- 
position, then each of them also follows a curve. The phases 2, 3, 
4 and 5 of the equilibrium (1) follow in fig. 1 (ID, therefore the 
eurves 2D, 3, 4% and 5. By this the quadrangle 2345 may be 
deformed in different ways, so that the reaction in the equilibrium 
(1) ean change in many ways. 
When the equilibrium (2)=1+3-+4-+5 follows in the P,7- 
diagram curve (2), then each of the points 1, 3, 4, and 5 follows 
a curve 12, 32, 4% and 5% in the concentration-diagram. 
As the same is also true for the other equilibria (3), (4) and (5), ° 
four curves start, therefore, from each of the points 1, 2, 3, 4 and 
5 in the concentration-diagram. Hence it is apparent, therefore, that 
at some distance from the invariant point in the P, 7-diagram, several 
changes in form of the quadrangles of the concentration-diagram 
may occur, by which the partition of the regions in the P, 7-diagram 
is changed. We call this the deformation of the regions. 
In order further to elucidate those considerations, we take a 
simple example viz. a ternary system in the invariant point of which 
the phases: ij 
watervapour = G, solution = LZ and the salts 7, Z, and Z, occur. 
We assume that those phases are situated with respect to one 
another as in tig. 1. Now we have the monovariant equilibria: 
(A)=ZAZLALLAG; ZI=Z4Z,4L4G6; Z=Z4AZALLG 
DALLA (OLAZ HL. 
In fig. 1 only three of these equilibria are drawn; curve La 
represents (Z,) consequently the saturationcurve of Z, + °Z, under 
its Own vapour-pressure; curve LO represents (Z,) and curve Le 
represents (Z,). Consequently curve Zé is the saturationline of ZZ, 
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