( 17 ) 



If now led by equation 





(4a) 



we (liiiw tlic 1\ 7-line for a conccjilralion on the left of the curve 

 of the compound, we obtain a curve as gi\'en by GF'FD in fig. 2. 

 As we have assumed in our diagram, that the vapour-tension 

 of A is the greatest and of B the smallest, whereas that of A B is 

 intermediate, we cut now that branch of the three phase line of the 

 compound, which has a maximum. 



F 



Fig. 2. 



This intersectiou takes place in the points F' and F, about which 

 it may be observed, that F' lies at a higher temperature than F. This 

 situation can, however, also be reversed, and as appears from the 

 diagram, the transition takes place at a concentration somewhat to 

 the left of that of the compound. We see further, that the inter- 

 mediate piece, which continuously joins the line of sublimation GF' 

 to the melting-point curve F D, has a maximum and a minimum 

 (points where A'., = 0), about which the isotherm teaches us, that, 

 when we are not in the immediate neighbourhood of the critical 

 state, they are very far apart and that the minimum lies at a 

 negative pressure. 



2 

 Proceedings Royal Acad. Amsterdam. Vol. IX. 



