150 



Journal of the Mitchell Society. 



u> 



ec. 



though well marked divergence in \i! corresponding to the 

 concave sink in the PV curve. 



It is clear therefore that these abnormal values of the PV 

 product must be carefully investigated before the correspond- 

 ing divergences in // can be regarded as in any way evidence 

 against the theory by which that constant is derived. 



INTERNAL HEAT OF VAPORIZATION. 



The internal heat of vaporization was plotted against the 

 temperature, Diagrams 8 to 10. These curves are more fully 

 discussed later (p. 161). We would here call attention only to 

 one feature of these curves, viz.: Corresponding to diver- 

 gences in fx' there appear irregularities in these curves and 

 these variations would (excepting in stannic chloride and the 

 associated substances) for the most part disappear if the 

 curves were smoothed, and the smoothed values thus obtained 

 used in the calculations. 



DIAGRAM OF L, — E, AGAINST THE jjK d — ^ D . 



We have plotted, Diagrams 4 to 7, the results for all of the 



Diagram 4. 



Ordinates give internal heat of vaporization in calories. Abscissae give 



ditfertnce of the cube roots of the densities of liquid and vapor. 



