( 869 ) 
TAB EB IL 
Hexane + nitrobenzene. 
Temperature of the critical endpoint 20°.40, 
d, Sees 
tor the plaitpoint line = 53.75 atm. per degree. 
pin mm @ , 
‘a ; dT eS p hexane D 
‚of mercury | of mercury | 
18.65 | 4464 | 113.9 +2.9 
4.2 
19.44 119.4 ANT 4 2,3 
4.9 | 
20.24 123,3 421 4 1.9 
4.7 
20.62 1951 1, ieee 1.8 
15.55 | 103.8 | 98.4 5.7 
| ye A 
16352 40623 > | OLDE Lo PB 
4.3 
17:65 8 108.2 | 3.0 
4.6 
18.65 115.8 MKE SEP 2.6 
LA 
19.45 WG BY TA Ae | 2.55 
18.22 115.0 A) (06) 3.95 
| Ertl 
19.05 419.2 415.2 40 
ao 
19.85 121.8 ARE || 2.5 
| San 
20.30 | 4124.4 AD 27 2.4 
point line, and further that both in the case of retreat and in that 
of splitting-up of the plaitpoint line the three-phase pressure regularly 
rises with the temperature to the critical end-point. 
Preliminary measurements for the system isopentane + nitrobenzene 
have shown that neither in this case of retreat the three-phase 
pressure reaches a maximum, and then descends again ; in consequence 
of an experimental accident we have failed to obtain accurate measu- 
rements on this system. 
If in this way the discussed thesis about the contact of the three- 
phase-pressure line and the plaitpoint line appears to be incompatible 
with experience, we also think that we can prove that the theoretical 
basis of this thesis is wanting. 
dp pins 
The De for the three-phase pressure namely, is given by the equation 
a 
dp (ere) (n,—n,) — (we) (1, —14) 
