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| 2 ae B 
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1,50 1,40 1,30 1,20 
We may still take it, however, that we have advanced a step 
since our previous papers‘). It was there found that deviations of 
the isotherms in the gas state were systematically connected with 
deviations of the diameter and of the vapour pressure curves (with 
which the deviations of the latent heat of vaporization ete., are 
connected by thermodynamical formulae), while in the present case 
a much simpler survey is obtained of the deviations of the isotherms 
at densities at which the virial coefficient D need not be taken into 
account. These are shown in the two curves for B and €, which 
therefore play pretty much the same part in this particular region 
as the boundary curve for equilibrium between liquid and vapour. 
And it is again striking how the various substances arrange them- 
-1) Proc. March 1911, Comm. N°. 1200 and Proc. July 1911, Comm. N°, 1215, 
