^ L 



Fig. 7. 

 Dg very little volatile; A, B, and C very volatile. 



If now in one of the binary systems a maximum critical tempe- 

 rature occurs, the possibility still exists that the ring is opened in 

 consequence of the continuous merging into each other of the p- 

 and the ^'-curve at two places. 



Though the cases discussed here might be supplemented by a 

 number of others, I shall for the present drop the subject here, and 

 resume it again as soon as the experiment renders it desirable to 

 enter more deeply into these considerations or to extend them. 



II. The P,T-ngure. 



Four phase lines and critical endpoint curves. 



As in Dr. Morey's research P-J'-lines are determined it was 

 desirable to represent also these curves i. e. the four phase lines in 

 drawing for a few of the cases considered here. 



When we examine the projections of the eutectic liquid and 

 vapour lines, taking the direction into account in which the temperature 

 rises, and bear in mind that where a eutectic line is cut by a line 

 joining the two coexisting solid phases with each other a maximum 

 temperature prevails, this derivation can on the whole easily be 

 given roughly, provided the rules are made use of, giving the relative 

 situation of the four-phase lines round a definite quintuple point. 



