1096 
The points of beginning and of completed condensation which are 
contained in the Table were all determined with compression, as 
explained before; for the sake of accuracy the change of volume 
was conducted as slowly as possible. All the same the results show ° 
very distinct irregularities, which must find their explanation in the 
various grounds mentioned. ; 
The densities expecially must be accepted with some reserve: 
they are given in Table 2 (p. 1095) and Figure 2. The densities at 
the plaitpoint-and the point of contact were read from the figure. 
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Fig. 2. 
In comparing the plait-point of air with the critical points of its 
constituents (Comm. 1450), viz. —118°.82, 49.73 atm. for oxygen 
5 
