( 461 ) 



branch CF of the three-phase line and continning over FD, the 

 ordei' ill \\iiicli two of the three phases become ecpial in composition 

 is as follows: 



From tliis it follows firstly that, if somewhere on the three-phase 

 line of the compound liquid and vapour become identical (point//), 

 there is certainly also a point G where vapour and solid become 

 equal, as G is situated between H and F. 



Fio.5 



P 



Let us now consider the character of the different parts of the 

 three-phase line. From (^ to //, the state of affairs is just the 

 same as in Fig. 1. CF is, therefore, again liranch 1 with the order 

 GTj^ for the composition of the phases, FG branch 2 with the 

 order G^L and GH liranch 3 with the order >SYrL. 



Whilst howexer in Fig. 1 the character of branch 3 continued iqi 

 to I), a change occurs at H because L = (L \\ is easy to deduce 

 from Dr. Smits's ^;, r-figure that the continuation HD of the three-phase 

 line again exhibits the character of branch 1, the order of the jiha- 

 ses is just as on CTF : (tLS, with this difference that G is now 

 the richest in the component B whilst on branch CTF the vapour 

 Avas richest in A. Because in R the compositions of /> and G be- 

 come equal, a transformation in that point of the three-phase lijie 



32* 



