( 239 ) 



leads to the conclusion that there will be a maximum value of ./x'. 

 Li tig. () the value of ,/• for the two tiuid pliases of the throe-phase- 



Fis. 6. 



pressure as function of T is grai)hically represented. The highest 

 temperatui-e (the triple point of anthraquinone) ap})lies to .i- = 0. The 

 lowest point of the part of the .r, T tigure lying on the left is one 

 plaitpoint and the highest point of the part of the .i', T figure lying 

 on the right is the second plaitpoint. 



If we re|)resented the relation between p and .v for the fluid phases 

 of the three-phase-e([uilibrium, we should also ^e\ two separate j>arts. 

 It is easy to see tiiat for smaller values of .v an ascending closed 

 branch is ol)tained, not unlike the closed j),.v curxe for a binary 

 mixture at ccmstant temperature — and that foi- higlier values of.*, 

 a similar but descending curve is found. 



The j),T j)rqjeclion for the three-phase-pressure, so of the cur\e 

 according to which tiie two />, ,/', T surfaces intersect, consists of 

 two separate curves, rhat for the higher temj)cratures being a 

 descending curve, terminating in liie ji and T of the triple point of 

 anthraquinone. The part for the lower lemjieratures is an ascending 

 curve, beginning in the triple point of ether, if namely, we assume 



