186 Messrs. J. P. Kuenen and W. G. Robson on 



Fig. 3. 



Temperature. 



pressure is higher than the vapour-pressure of ether at all 



temperatures. The analogy between figs. 1 and 3 is evident. 



In fig. 4 the vapour branch is outside the liquid branches, 



Fisr. 4. 



Temperature. 



and again a critical point for the vapour and upper liquid 

 exists. Moreover, the liquids have a lower critical point, 

 the consequence being that the solubility-curves only exist 

 between two definite temperatures. It will be show T n below 



