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this new view there is no essential difference between the occur- 
rence of different solid and different liquid phases of one substance 
and as in the case considered here we have two liquid phases, one 
of which is always stable with respect to the other, we are justi- 
fied in speaking here of the phenomenon of monotropy for a liquid. 
Now it is of importance to examine what will take place when 
the region of incomplete miscibility comes into contact with one of 
the melting-point lines of the pseudo-binary system. 
Beforehand I will, however, remark that Dr. ScHorvrrs '), who 
undertook the same problem at BAKHuIs RoozEBoom’s instigation, but 
took no notice of the $-v-lines, could only draw by chance a line 
for the stable unary liquid equilibrium, as shown in fig. 4. 
Fig. 4 X. Fig 5 X. 
If we suppose that the region of incomplete miscibility comes in 
contact with the melting-point line of the component with the higher 
melting-point, we get the 7’, x-figure 5. 
Now it is of importance to determine the continuity between the 
two pieces ed and cb of the interrupted melting-point line of the 
pseudo-component 4, and also the continuity which is connected with 
it, between the mixed crystal lines ef and mf. Now it is the 
question where the liquid lines of the unary system will meet those 
1) Thesis for the doctorate. 
24* 
