( 295 ) 
The first of these equations states that the plait-point is situated 
on the spinodal line, the second that the isobar on the w-surface 
drawn through the plait-point, does not enter the plait. 
Van DER WAALS finds (Proceedings May 1895) for e=0, a 
formula (5), which we write: 
0° d 
ey. NO. 
p v 
ay 7 EE 
Ee 5 (st) + URT: Geer), 
where it is taken into account that at the critical point of a simple 
substance 
(Sa) = Ger) 
Besides VAN DER WAALS finds an equation (9) (Proceedings June 
1895) which we write: ; 
op\* 02, 
aT pI “er mts (a Jk rte CN 
for x equal to zero. From these two equations follows: 
Op ven Ei), 
MRT: (=<) 
Soot = (32) — ($5) © 
Here ae and pe indicate the variation of the critica] plait- 
Ri v 
point temperature and pressure with small admixtures, 7’, is the 
critical temperature of the pure substance. 
We may now naturally introduce the law of corresponding states 
into the equations given above. By means of 
p= 7 Pak 3 v= @ Uxk; T= Daz 
20* 
