( 907 ) 
d d 
Sn splits up, the line En =O assumes the shape as drawn in 
v & 
fig. 16. This will depend on how far the a-line has been displaced 
to the left, and the degree in which = increases with z. 
If at last the a-line has moved so far to the left, that the minimum 
has got on the left of that of 6, no minimum critical temperature 
will oecur in the system under consideration, however far we may 
think the diagram of isobars extended, provided not for negative 5. 
We need not give a separate drawing as an illustration for this 
course, for it is clear that this figure is obtained when fig. 18 is 
turned 180° round a line #= C as axis. So in the region to be 
considered no stationary values will occur in the critical pressure. ') 
So we shall have the course of fig. 10 for the isobars at low tempera- 
27 a, +a,—2a,, ore ; P 
Te — a point ot intersection o 
32 b, —- b,—26,, k 
tures. At a temperature of 
dp dp : ; dp 
— = QOand— =O appears, as according to § 10 — = 0 enters the 
Lv dv dx 
stable region at this temperature. So we get the course of fig. 19. 
a, + 4; 2a 
‘ di 
At the temperature at the curve zie = 0 closes on the 
FRET, do 
Fig. 19. 
1) It will not require any further explanation that we need only examine the 
portion on the right of the negative b’s as we have fixed by definition that 5 will 
increase with <x, 
61* 
