1239 
1200 
1190 
120 
174 
1160 
Pressure scale for the curve of 50°. 
950 
340 
930 
0 10 20 30 40 50 60 70 80 30 104 
Fig. 6. 
We too found in our first experiments critical points of 40° or 
even higher. It is sufficiently known that small impurities have 
an enormous influence, especially on the critical point; they may 
cause it to rise, for instance, 100 times as fast as the boiling point. 
This is the reason why the triple curve is not nearly so sensitive to 
impurities and why our former determinations with substances, which 
showed the critical point 39.5°, as well as the more recent ones fit 
perfectly into one line, 
