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is formed either F+’ or F’+G or G. If the complex has such 
a composition that the line cc’ intersects the regions + /”, 1 and 
G either F-+ #” or F+ G or G is formed. 
Let us now take a pressure concentration diagram for a temperature 
higher than the maximum sublimation point, but lower than the 
minimum melting point of the complex 4 + F”. If in fig. 1 we draw 
a vertical line which intersects curve DS we notice that this diagram 
may be represented by fig. 3. 
Besides the regions G, F+ 4’, l and 2 which appear already in 
fig. 2 we also find here the regions : 
dh 1G, 6=F+4+L5+4+G6 and 7=F'4+ L+ G. 
If from P+ fF” is formed one of the systems G, F+ Gor F’ + G, 
the vapour G always has a composition that can be represented by 
a point of fig. 3; the same applies to the liquid Z if from F+ F” 
is formed one of the systems L, F+ L or FY + L. 
If, however, 1+ G is formed as in the systems 2+ G, F+ LG 
and /” + L + G, such, as we have seen previously, is no longer 
the case and neither £ nor G can be represented by a point of the 
diagram. 
Let us take for example a complex A (not drawn in the figure); 
this complex. is resolved into a liquid Z and a gas G, both situated 
outside the plane of fig. 3. If Z is situated above this plane, lies 
below the same and reversedly so and in such a manner that their 
conjugation line intersects the region 5 in the point K. 
If we take a complex A’ within the region 6(7), we then suppose 
this to be resolved first into /’(#”) and a complex K of L+G; 
the complex A is, of course, represented by a point of fig. 3. To 
this complex now applies the same as to the complex K within 
the region 5. 
Hence, if from #'+ F” is formed a 
system in which + G appears, the com- 
plex L + G is certainly represented by a 
point of fig. 3 but Z and G separately 
are not; one of these phases lies in front 
of, the other behind the plane of fig. 3. By 
way of distinction from the other regions, 
the regions 5, 6, and 7 are dotted; we may 
imagine that these points represent the 
points of intersection of fig. 3 with the 
Fig. 3. conjugation lines liquid-gas. We have noticed 
previously that in some systems oecurs only an infinitesimal quantity 
of L or G; of a similar complex L° + G or L + G° the gas is 
