1g 
LV 
Fig. 4. 
We notice that the minimum does not quite lie at the melting 
temperature of the compound [Br but is removed about 4° to the 
side of the component with the lower vapour tension. 
5. We have sketched in Fig. 5 the spacial figure of a system 
of the type discussed in this paper. The figures 4 and 5 thus 
express characteristically that the formation of the compound [br 
causes two maxima and an intermediate minimum on the three-phase 
line whereas in default of that compound only one maximum would 
occur (Fig. 2). Hence, in the form of the three-phase line we possess 
a new means of finding a compound in a series of mixed crystals. 
For we must think that a narrowing in the melting line can only be 
stated when the interval between liquid and solid branches is large 
enough to be determined experimentally with sufficient accuracy. 
This new criterion is all the more welcome because another means 
cannot be applied to this kind of system. We mean the determination 
