in determining one critical end-point (p) ; the second {q) was not to 
be reached on account of the pressure lying too high. Fig. 6 repre¬ 
sents the P- 7-projection of the P- J'-rfgure. The three-phase line on 
il‘e side of the most volatile component, in our case hydrogen sulphide, 
Practically coincides with the liquid -vapour line of the pure com- 
Ponent; it has been drawn separate for the sake of clearness. The 
solubility is so slight here that the isotherm lowering of vapour- 
pressure (till the saturated solution under three-phase pressure is reached) 
Poetically zero; tbis involves that the critical end-point p differs only 
l,t e in pressure and temperature from the critical point of hydrogen 
sulphide (7^ 99.0°; 7W03.CT; p k ^ 88.3 atm.; p tp 93.9 atm.). 
18 * 
