fis. 3 



The li<|iii(l tMiiiilihrimns lie ;il)()ve (\ Tlie position of llie line BC 

 indicates the thi'ee-|)hase-i)i'essure. The curxe ECPB denotes the 

 liqnid-vapoHi equilihrinnis, of which the pai't lying below CB may 

 ojily be realized by retardation of the a|)|)earance of the solid state. 



Let us now examine what happens at higher temperature as well 

 to the curve of the liquid-vapour e(piilibriums as to that of the 

 equilibriums l)etween the solid state and the Huid state. From the 

 theory of the binary mixtures (Cont. II, |). JOT etc.) we know, that 

 the lirst mentioned curve ECPBE contracts and moves upwards. If 

 we assume (IT to be iniinitely small, all the points of this cur\e 

 will be sid)jected to an intinitely small displacement, with the excej)tion 

 of one })oint, i. e. that for which IT^j = 0. This point can lie on 

 the right or on the left of the j)laitpoint /^ according as the plait- 

 poiul cur\e descends or ascends. Also the cui-nc of the solid and 

 tluid equilibi'iums is transformed and displaced. The modilication 

 which this cur\-e undergoes with increase of tenq)ei"ature has been 

 denoted by the dotted cm'\e in tig. 4 and tig. 5. We shall presently 

 explain this fiiither. Now two cases may take ]»lace, which both 

 occur for mixtures of anthraipiinone and ether. Either the three- 

 jthase-pressure rises with 7', or it fails. IJnt in both cases such a 

 tenqtei'atnre may occur that the straight line, w liicii Joins tlie two 

 tluid jihases coexisting with the solid body, has contracted to 

 a point. 



To the former of these two cases applies lig. 4. In this case the 

 cui'N'e A]j moves towards smaller \alues of ,/■ with increasing tem- 

 perature. Not indelinitely, however. Near the highest value of T, 



