( 19 ) 



for the conoentration of tlie compound assumes a shape, as given 

 by the line G^ l\' F^ D^ in fig. 2. 



If it were possible to make the degree of association of the com- 

 pound smaller and smaller, the points FJ and F^ would move to 

 lower pressure and higher temperalure. Moreover these two points 

 and the neighbouiing })oint of intersection of the melting-point and 

 sublimation branches would draw nearer and nearer to each other, 

 till with perfect absence of dissociation these three points would 

 have coincided. 



Another peculiarity will present itself for the case that we have 

 a three-phase-line as desci'ibed by me before, viz. with two maxima 

 and one minimum'), for then there is a point where Xfi=zxL^) on 



Fig. 3. 



this line, and tiien it is immediately to be seen tiiat in consequence of 

 the coinciding of the points F' and F, we get for this concentration 

 a PjJ'-line, as represented in (ig. 3, which curve has the form of 

 a loop. 

 Amsterdam, April 1906. Anorg. Cliem. Lab. oj the University, 



1) These Proc. VIII, p. 200. 



2) lu this point the direction of the three-phase line is given by 2'~jyr,= 



dT vd-vi 

 2* 



