( 918 ) 
But at the same time this mixture taught us that we had taken 
the concentration still much too great. For with increase of the 
pressure the topmost of the three phases always disappeared first, so 
that two liquid layers remained. Instead of on the left side of the 
point 1 of van per Waats’ fig. 41, (which we reproduce below) as 
is required for the observation of the double retrograde condensation, 
we were all the time on the right side of the point 2. This appeared 
also to be the case, at least for higher temperature (I regret to say 
that we have neglected to observe this condensation at the lowest 
temperature to be reached before the solid substance makes its 
appearance) with the mixture II of concentration « = 0.0245. With 
this mixture we determined the point of maximum three-phase-pressure, 
i. e. the point, at which in the presence of the third, dense phase 
oe 
\ ONG ie AN JAR Ee ie pl 
ie a Fe 3 EERE RN Pas 
Xe | 
5 ae 
/ cores 
Oe \ 4 Le 
t = En EE Lea EE — 
ZAAN ae | 
nete ee 
<< 
all the other values a similar concordance is found by interpolation, except for 
the three placed between parentheses in which the stirring has apparently not 
been sufficient to reach complete equilibrium, or for which another error of obser- 
vation made itself felt, 
