Fig. 45. 
J2 
„ay 
line which runs in the neighbourhood of —— ==0, contracts. 
At 
If the point C is to exist, in the first place the point A, the point 
6 ; dp dp : 
of intersection of (2) = (and ia = 0 must occur; and from this 
Uso LU) x L 
follows that the value of 2, in which 7% is minimum, is not too 
small. In the case that we supposed above, the value of 2 for 7%, 
minimum was so small, that the point A did not exist for it, or 
would have to be supposed to occur for negative values of z. In 
other words: this splitting up of the spinodal line is only possible 
if the value of wv, for which 7), is minimum, is not very small. 
2 
d ¥ 
Moreover, the condition is, of course, that ~ = 0 shall disappear 
U 
2 
a zn Sy 
outside the region in which aa is positive. But this splitting up of 
y? 
the spinodal line again requiring that 7% has minimum value, we 
may put as a general rule that only if 7; shows minimum value, 
splitting up of the spinodal line can occur. 
But not only the point A must be present, if the discussed splitting 
up of the spinodal line is to take place, but of course also the point 
C itself; and the existence of the entire detached closed portion of 
the spinodal curve even demands that the point C shall oecur for 
not too small a value of « —- though the limiting value is not to 
