122 Prof. Kuenen and Mr. Robson on Mixtures with 



Table VL— Vapour-pressures of Chloroform, Acetone, 

 and Mixture. 



Temperature. 



Pressure. 



Chloroform. 



244-5 



42-7 



251-3 



450 



— 



45-6 Later. 



— 



48 4 After prolonged heating. 



2629 



53*8 Critical point. 



262-55 



54*6 „ ,, later. 





Acetone. 



1050 



25-44 



204-9 



29 97 



214-8 



35-11 



224-75 



40-79 1 



— 



40-84 \ At different volumes. 



— 



40-80 J 



233-65 



46-76 Critical point. . 



233-7 



46-78 





Mixture. 



251-3 



4 q.- 1 At different volumes. 



257-6 



51-4 



259-6 



53-3 Plaitpoint. 



259-4 

 1 



54'6 „ „ later. 



is higher than the pressure of the chloroform at the same 

 temperature. Again, drawing a straight line between the 

 critical points of acetone and chloroform in the pressure- 

 temperature diagram, it appears that the critical pressure 

 -of the mixture, 53*26, is slightly higher than the pressure 

 •on this straight line at the same temperature, 53*03. With 

 a tolerable degree of certainty we may therefore consider 

 the following facts to have been established : — 



(1) The minimum vapour-pressure which exists at low 

 temperatures has disappeared at the critical point ; and 

 (2) There is no maximum critical temperature, and the 

 •critical curve connects the two critical points in the normal 

 manner, with a slight convexity towards the high pressures. 



In order to confirm the results obtained, as far as pos- 

 sible, by a better method we repeated the determination of 

 the critical temperatures of chloroform and of two mixtures — 

 one containing a very small and the other a somewhat 



