( 835 ) 
The possibility that on the liquid-vapour plane a line of maximum 
pressure oecurs, cannot be excluded beforehand, of course, more 
especially because in this system a compound occurs, and moreover, 
one of the components (//,0) is certainly abnormal. It seems even 
still possible here, that immediately on the hydrogen sulphide side 
such a line of maximum pressure occurs; then it must lie, however, 
at concentrations which are smaller than the gas and liquid con- 
centrations on both the three-phase curves. This, however, does not 
seem probable for the present, and so I have not taken it into 
consideration in the /?-v-section (fig. 3). 
The two three-phase curves SL,G and L,L,G intersect in the 
quadruple point (29.5°; 22.1 atm.); the two other three-phase curves 
which pass through this point, where resp. solid hydrate occurs by 
the side of two liquid layers (SL,L,) and by the side of vapour 
and liquid rich in water S/,,G, have also been represented in the 
graphical representation. 
The preceding table gives a survey of the observations of the 
discussed lines of equilibrium, 
5. By the aid of the above data, a P-v-section has been given 
schematically in fig. 38, which has 
been drawn through the spacial 
figure for about 20°. In this we 
have assumed, as was mentioned 
above, that the liquid-vapour sur- 
face descends continually from the 
first to the second component; the 
point «, the maximum tension of 
liquid hydrogen sulphide lies higher 
than the stabie three-phase curve 
S L, G (6) and the metastable 
L, L, G(c)*). The other equilibrium 
nN 
4 
+ 
cf 
curves and the regions given in 
the figure do not call for a further 
explanation. I will only draw at- 
tention to the fact that the hydrate 
in this section can ne longer occur 
stable below the three-phase curve 
SL, G(d); for with isothermal in- 
Wig. 3. 
crease of volume the transformation 
SsL+G occurs on this three-phase curve, in other words, the 
1) All the metastable lines of equilibrium have been indicated by dotted lines. 
