( 44) 



As to the spinodal line T = 1\ (r = 0,59), we calculate x — : 0,0019 

 for CO = 0,30, whereas x == 0,006 corresponds to to = 0,40. 



As to the shape of the spinodal lines for great values of ?; (vapour 

 branch) i. e. when t and oi approach to 0, follows immediately 

 from {lb): 



X = 4to 



:c{l-x) + {<p^xy 



= 4(o 



^' + (29)+l).x- 



If we substitute ^/To = T': -^— for r, and - for to, we get: 



rib V 



2«' r 1 



i2r=--|^rp' + (2y + l)^J 



l/«l 



After substitution of fp 



From this follows that the vapour branches of the spinodal lines 

 in their v, .r-projection will approach more and more to straight lines, 

 which will cut the axes x = and x = i at distances proportional 

 to the quantities a^ and a^. 



5. Let us now consider the second type, which occurs for y =: 2. 



a. Description of the case (p = 2 (fig. 2 and fig. 2a). 



The two plaitpoint curves of fig. 1, viz. C^C^ and C^A have met 

 for (p about 1,43 (see fig. 4j, after which two new ones have been 

 formed, now C^C^ and C^A. This case, which is found for compa- 



ratively large values of t/, for which the proportion — approaches 



more and more to unity, is the usual one or the normal one. It is 

 the principal type III, as described in one of my two preceding papers ^). 



The region of negative pressures on the spinodal lines extends 

 now all over the v, ^'-diagram, from x=zO to x=il, and is bounded 

 by the two dotted curves (see fig. 2) above and below. 



The spinodal line belonging to t = 1,35 touches now the curve 

 Co A in the point R^. Again the plaitpoints are not realisable from 

 a point between R^ and C^ to A (see the footnote in § 4 at a.) 



Beyond R^ the temperature and with it the pressure decreases, 

 so that in the ij,T diagram (see fig. 2a) the curve C^R^A runs back 



1) 1. c. p. 642-644. 



