868 
If starting from fig, 1 we now reduce the pressure, the liquidum 
line of the heterogeneous region approaches the saturation curve of Hand 
meets this at a definite temperature. The diagram now formed may 
be deduced from fig. 2 (1) if we suppose the saturation curve of F 
therein to be surrounded by the curves de and d,e,. The diagrams 
appearing on further reduction of the pressure can be represented 
by figs. 3 (1), 4-(1),.-5°@),. 6-(a), or SAB (059 (1) and ONE 
In each of these figures, however, the curves de and d,e, must be 
imagined to be bent in such a manner that they entirely surround 
the liquidum region; they finally disappear in the point with the 
minimum pressure. 
From this it now follows that the liquid as well as the vapour 
of the three-phase equilibrium /’+ £ + G proceeds along a closed 
curve like in fig. 7 (1) or 11 (4); the saturation line under its own 
pressure is, therefore, again circumphased and the correlated vapour 
line cireumphased or exphased: 
If we consider temperatures very close to the melting point of F, 
we find as in the first communication, that the saturation line 
under its own vapour pressure becomes exphased. and that we 
obtain diagrams such as in figs. 12 (1) and 13 (4). 
We now consider the case where the point with minimum vapour 
pressure falls within the saturation line of /, or in other words, 
that the liguidum and the heterogeneous region disappear in a point 
within the saturation surface of F. 
We again start from fig. 1 and reduce the pressure first of all 
until the liquidum and saturation curve come into contact, then 
until both curves intersect. We now obtain a diagram as in fig. 8 (1) 
in which, however, the saturation curve of / is supposed to be 
surrounded by the heterogeneous region L (. 
| On further reduction of pressure, 
the liquidum line of the heteroge- 
neous region and the saturation line 
of # may once more come into eon- 
tact, so that on further reduction of 
N 
\ 
\ 
\ . 
Vad = Gy pressure two new three-phase triang- 
8 » les are formed; we then obtain a 
| diagram such as fig. 2 with four 
hy, three-phase triangles. The liquidum 
: ‘region now consists of the two iso- 
RS as lated pieces apgg and 4rhs, the hete- 
N rogeneous region likewise of two 
” 
isolated parts, namely of a,g,gpa 
