1034 
T. A Bai Ee VIE 
| Water + methylethylketone 
_— 4 ——— = eS oe = = 
dp 
ete DD) 0°.7 
| + + 0°.096 
250 + 3.1 +0.1 
+ 0. 094 
300. 4) SE 1.8, 0 
+ 0. 086 
350 +12.1 +0.1 | 
+ 6. 079 
400 | +16.05+0.1 
+ 0. 074 
450 +19, 15 +0. 15 
+ 0. 069 
500 se 20: Are dl 
_+ 0. 070 
600 30.2 +0.1 
A + 0. 071 
110 31.3 0.1 
: + 0. 068 
800 +44.1 +0.3 
: + 0. 072 
900 51.3 +0.3 
; \ in ALE 
1000 +61.6 +0.3 
2 + 0. 106 
1050 | +66.9 +0. 
point joins that proceeding from the upper end-point. For though 
e.g. at 80° the mixture, homogeneous under a pressure of 1100 kg. 
per cm®. becomes turbid when the pressure falls to 1085 kg. per 
em*. the pressure must be lowered to 1075 kg. at 86°.5 to reach the 
heterogeneous region. Moreover a mixture homegeneous at 86°5 
and 1075 kg. unmixes no longer on /eating, as it did before, but on 
cooling; on further cooling, if the same pressure is retained, finally 
the homogeneous region is again reached. 
In the last-mentioned system the observations were less accurate 
than with the others, because the critical opalescence is almost 
entirely wanting, and the indices of refraction of the two phases 
are nearly the same; we think, however, that we are justified in 
accepting the above results with certainty, at least as far as the 
general course is concerned, because also another filling, with a 
somewhat different concentration, gave analogous results. Here too 
the highest pressure for which there was still question of unmixing 
is about 1100 kg. per cm?; the plaitpoint then was at about 80°; 
above this temperature the windows became opaque. 
§ 5. Summary of the results. 
The preceding determinations sufficiestly prove the efficiency of 
