(124) 



in this region turn their concave side to the axis of the 1 Bt component. 

 In the case to be discussed now they turn their convex side towards 

 the 1 st component, and hence the hidden plaitpoint must lie on the 

 other side, as a point in which a ^-line touches the spinodal line in 

 the unstable region. The drawn q-line intersects the spinodal line 

 in 6 points, and the p-line, thought as function of v, must have 3 

 maxima and 3 minima, when this r/-line is followed ; a maximum 

 value in the points 1, 3 and 5, a minimum value in the points 2, 

 4 and 6. In fig. 20 this /(-curve is represented and the different 



Fig. 20. 



branches of this line are indicated by the letters a . . . g. The branches 



a and / traverse the region where is negative, and accordingly 



dx* 



dp 

 have two points each, where — = oo. The complication which the 



dv 



p-]\ne presents in this case compared with the /(-line of fig. 16, 



consists only in this that the branch e, which before ran directly to 



infinity and continually to smaller volumes, has now got a maximum 



in the point 5, and as soon as the (/-line passes into the region 



d'rp 

 where — is negative, runs back to larger volumes. In the point 6 

 dx* 



the minimum value has been reached, which however must be larger 



than the maximum value of the pressure in the point 3. If the 



