318 



SCHREINEMAKERS 



ART. H 



L(z) + solid H, those between u and H into L(u) + solid H, 

 whilst liquid H solidifies to solid H. Thus two liquids, z and u, 

 exist, both saturated with respect to solid H; z has a smaller, u a 

 greater amount of X than the compound. In Fig. 15 these 

 liquids are represented by the points z and u. As {H) and H' 

 approach one another with increase of temperature and finally 

 coincide at T' = T(H), so also z' and u' coincide at this tem- 

 perature. Consequently the saturation curve of H will have 

 the shape amq, shown in Figs. 15 and 17, with a temperature 

 maximum at T{H), shown at point m. 



Fig. 15 



We now imagine the f-curve of Figs. 14 and 16 at first totally 

 above the lines {W){H) and {H){X). Since with increase of 

 temperature the ^-curve approaches the composition axis WX 

 more rapidly than these lines, it will lie totally below them at a 

 sufficiently high temperature. Consequently the f-curve will 

 touch the line {W){H) in a point a' at a definite temperature 

 T{a), and will touch the line {H){X) in a point h' at a definite 

 temperature T{h). If we take T{a) < T{h), then a' lies 

 between (W) and (//); the point h', however, may then be 



