794 



Fig. 1. 

 7)3 the least volatile; B more volatile than C; A very volatile. 



The arrows on every curve indicate the direction towards iiiglier 

 temperature. 



The closed curve pq is the critical endpoint curve with the 

 ternary compound as solid phase. Hence critical phenomena take 

 place by the side of the solid ternary compound D, along this line. 

 The critical endpoints wiiich are found starting from the ternary 

 compound D, and pure A lie in the points p and 3. On addition 

 of B, as well as of C these points approach each other, till they 

 finally coincide. Now it has been assumed here that the ternary 

 compound can exist up to the highest eutectic temperature that 

 occurs in the ternary sytem. 



If this is not the case, however, and if the ternary compound de- 

 composes before this temperature has been reached, so that a double 

 salt Z), occurs as solid phase, the tigure becomes as indicated in 

 fig. 2. 



Now the transformation points L\ and G\ resp. L\ and (J\ occur 



