1105 
Fig. 9. 
The combination of the fig. 6,7, and 
8 gives fig. 9. When we draw the 
P-X section for 7, we obtain fig. 10, 
where the points corresponding with 
those in fig. 9 are denoted by the same 
numbers. 
The point of maximum pressure lies 
on the eritical curve. The composition 
of 1 will deviate a little from x, when 
Fig. 10. _T, lies slightly higher than 7,, and 
this is still more exactly the case when the composition of the critical 
line varies little with variation of the temperature. To find the com- 
position of 1 experimentally we must start from a mixture z,, which 
contains more solid substance than is required for g. With this 
mixture we determine at 7, the point of end-condensation 3. Then 
after cooling some of the solid substance is pushed under the mercury 
meniscus, whereby the composition of the mixture is changed a 
little to the left in fig. 10. Again with the composition so obtained 
e.g. v, we determine the upper limit of the loop LG at 7. When 
we isolate successively different quantities of the solid, points of the 
line 3, 1, 2 and 4+ in the P-X section may be found. Evidently the 
maximum pressure, point 1, corresponds to the mixture 2,. If there- 
fore the maximum pressure is realized, we have the mixture z,, 
deviating a little from z,, at least if 7’, deviates slightly from 7%. 
