( 872 ) 
the concentration of the critical end-point in homogeneous state at 
different temperatures, may be substituted for the rise of the plait- 
point pressure proper with the temperature. And this is nothing but 
the thesis mentioned. 
§ 2. A second thesis derived by van per Waats, which can be 
tested experimentally, states, that in the case of splitting up of the 
plaitpoint line always a minimum critical temperature of the unsplit 
mixture must be present, so in general also a point where the con- 
centrations of vapour and liquid become equal (maximum vapour- 
pressure in the p,v-line; minimum boiling-point in the 7\z-lime). In 
the case of retreat such a point is possible, but not necessary. 
In the two cases mentioned in the preceding §, the measurements 
seem to prove the existence of such points, because the three-phase 
pressure has been found higher than the value of the vapour-tension 
Ae 1E AV; 
Hexane + aniline. 
Temperature of the critical end-point 689,9. 
Concentration _ | 
weigh! of | Boiling. g7 tae 
the aniline} — per ®/, 
4 tol00parts point  @¢ | dr 
of mixture | 
| 
0 0 68.95 
0.170 18.04 
0.0388 | 418 | 69.65 
OES 19514 
0.0859 9.31 70,55 
0.19 20523 
0.1205 12.95 mh 
0.14 14.33 
0.183 19.52 12515 
0.08 8.39 
0.2795 | 29.55 12290 Pi 
| 0.033 3.43 
0.3524 37.04 1520 
0.013 | 4.29 
(0) .4296 44.88 73.30 | 
| 0.013 | DEAT 
0.5083 Da 73.40 | 
| 0.007 0.72 
0.5778 59.67 13.45 
0.024 9.40 
0 6103 65.80 73.60 
0.064 6.28 
0.6880 | 70.45 73 90 | 
| 0.36 | 35.20 
0.7505 76.48 AOP | | 
| 0.74 70.83 
0.8458 | 85.57 82.85 
| 7.04 658.6 
i ‚100 184.40 | 
