( rm ) 



is here =4. (cl'. Ibr tliesc and oIImm' data (he already repeatedly 

 mentioned paper in these proceedings). 



Tlie plait|)üiiit I' ha.s strongly shifted lo the side of the small 

 volumes; (here is always equilibrium between a gas phase 8 and a 

 licpiid phase 2, which is comparatix'ely rich in the 2'"' component. 

 With smaller volumes (he gas phase 3 is pracdcally equal to a 

 liquid phase, l)nt the transition is gradual. (The full-traced border 

 curve.s of (ho plaits in (heir /■, .r-prqjecdon, on which (he straight 

 node lines rest, represent eveiy where the oonnodal lines; the dotted 

 lines always represent the spino<lal curves ; the plaitpoint line is 

 indicated by crosses). 



At r=:l,Q and t = 1 we see the conno<lal lines in the ligure. 

 If T is somewhat below 1, e.g. 0,98, a connodal line arises running 

 at a short distance round ('„, while the large connodal line shifts 

 its plaitpoint further to C„. At t = 0,97 the two plaits meet in a 

 homogeneous douhk point '). At still lower temperatures we have an 

 open plait, of which the two branches of the connodal line recede 

 towards the i-ight and the left, and whicli is traced for t = 0,8. Up 

 to the highest pressures, a\ and :i\ continue to differ, and it is no 

 longer possible to mix the two phases to one homogeneous liquid 

 phase by pressure, however great. With values of T' between T„ 

 and 0,97 7*0 the homogeneity reached at a certain high pressure was 

 again broken at still higher pressure, after which the two phases 

 diverge more and more up to a certain limit. 



In fig. 2 an important moment has been represented. At t = 0.63 

 the spinodal curve touches namely the plaitpoint line C^A in R^, 

 and from (his moment a new closed connodal line begins to appear 

 of the shape as is I'epresented in fig. 3 (r = 0,62) v:ithin the connodal 

 line proper. The spinodal line touches that isolated curve twice, i.e. 

 in the plaitpoints p and p [all this has been fully explained by 

 KoRTKWKG (loc. cit.)], whicli for r := 0,63 coincide to a so-called 

 "point double heterogene" in R^ '')/ The connodal line in question 

 does not yet present, howcxer, realizable equilibria, because that line 

 lies on the i|'-surface abore the tangent plane to the connodal line 

 proper, which determines (he phases 3 and 2. 



1) In fig. 1 the spinodal lines seem to touch each other in this douhie point ; 

 of course this has to be an intersection. 



2) It need hardly be mentioned, that every time only one, after the contact at Ri 

 two points of the plaitpoint line correspond with the temperature of the spinodal 

 and connodal line under consideration. All the other points of the plaitpoint line 

 wliich is every time projected as a wliole, belong lo oilier, lower and higher tem- 

 peratures. 



