( 397 ) 



From this graphical representation follows: 



1. that the system water-phenol really possesses a minimum plail- 

 point temperature, 



2. that it lies in the neighbourhood of x = 0,1. Now Schreinemakers 

 has found thai the mixture x = 0,011 has maximum pressure at 

 56°, the mixture ,r — 0,015 at 75 5 , and x = 0,017 at 90\ These 

 observations deviate from the theory, for the maximum pressure 

 point does not move to the right with higher temperature, bul to 

 the left. If, however, we choose one of Schreinemakers' observations, 

 no matter which, then the fact that the minimum plaitpoint tempe- 

 rature lies at an x larger than that of the mixtures for which maxi- 

 mum pressure is still possible, is in accordance with the theory. 



3. As the extremities of the ordinates belonging to the abscissae 

 # = 0.1, x = 0.2, and x=l lie about on a straight line, and as 

 those belonging to x == 0.35 and x = 0,5 are obviously above it, 

 we must conclude to the presence of a /><>/'/// of inflection in the 

 Tx projection of the plaitpoint curve. It is doubtful whether we 

 must attach physical significance to this. 



In conclusion I have still to mention that in these observations no 

 electro-magnetic stirring-apparatus has been used, which, however, may 

 be applied as soon as a quartz stirrer of sufficiently small diameter 

 is ready. 



Amsterdam, Physical Laboratory, 



