the Mutual Solubility of Liquids. 199 



namely, the possibility of making the two liquids mix by 

 pressure at temperatures above the lower critical temperature. 

 It depends on the proportion of alcohol in the mixture whether 

 this will be possible, or whether either the one or the other 

 liquid will gradually diminish in quantity and disappear. 



Fiff.8 



60° C. 



With a suitable proportion the plait-point P 2 may be reached 

 by the application of pressure. If the composition of the 

 mixture does not correspond accurately with the composition 

 of the plait-point P 2 , the critical phenomena of the liquids are 

 obtained either near the top or near the bottom of the column 

 of substance. Thus, with one particular mixture (Table IX.) 

 several points of the plait-point curve C 2 C 3 could be de- 

 termined*. 



* The explanation of this is to he found in the action of gravitation. 

 See Kuenen, Communications Phys. Lab. Leiden, No. 17. 



P 2 



