867 
This causes that many of the properties already mentioned may be 
deduced and expressed in a much more simple manner. I will refer - 
to this later when discussing the vapour pressures and boiling points 
of aqueous solutions saturated with salts and double salts, which in 
some cases have been determined experimentally. 
(To be continued). 
Chemistry. — “Zyulibria in ternary systems.” Ill. By Prof. 
SCHREINEMAKERS. 
(Communicated in the meeting of Dec. 28, 1912). 
In the previous communications ') we have assumed that in the 
system  liquid-vapour occurs neither a maximum or minimum, 
nor a stationary peint; we have also limited ourselves to the appear- 
ance of two three-phase triangles. 
We will now discuss first the case that in the ternary system 
occurs a point with a minimum vapour pressure. | 
Let us imagine that in fig. 1 (1) the liquidum line de and the 
vapour line d,e, of the heterogeneous region LG surround the sa- 
turation line of /, so that we get a diagram as in fig. 1. The 
saturation line of / is here surrounded by the liquidum region ZL, 
this by the heterogeneous region LG and this in turn by the vapour 
region. All liquids saturated with # therefore occur at the stated 
P and 7’ in a stable condition. 
On reduction of pressure, the liquidum region contracts so as to 
disappear simultaneously with the heterogeneous region LG in a 
point. This point represents for the stated temperature, the liquid 
and the vapour which, at the minimum pressure of the system liquid 
+ gas can be in equilibrium with each other. 
G This point may occur without as well as within 
the saturation line of / As at lower tempera- 
tures the region /’/, is generally large, but small 
at temperatures in the vicinity of the melting 
point of /*. the said point will appear, at high 
temperatures, usually without, and at lower tem- 
Fed, peratures as well within as without the saturation 
line of #. 
We now first consider the case where the point with a minimum 
vapour pressure falls outside the saturation line of /’, or in other 
words that the liquidum and the heterogeneous region disappear in 
a point outside the saturation line of #. 
1) These Proc. p. 700 and 858. 
