174 Journal of the Mitchell Society. [Dec. 



this fact we propose later to show in connection with a paper 

 applying the law of attraction to the boiling- point. 



In conclusion we again point out that we are indebted to 

 Drs. Ramsay and Young- and to Dr. Young, for nearly every 

 measurement used in this article. And we would again 

 express our great appreciation of the accuracy of these meas- 

 urements and acknowledge our obligation to them. 



SUMMARY. 



1. Several facts bearing upon the results of the last paper 

 are discussed. These facts confirm the law of attraction 



L E t 



assumed by making it most clear that -=7= rf= does equal 



a constant (designated /*'), for normally constituted sub- 

 stances, and that the equation is applicable with equal exact- 

 ness in the immediate neighborhood of the critical tempera- 

 ture. 



2. An equation, L = 2RT log e -=p proposed" by Mr. H. 



Crompton was investigated, and it was found that at low 

 temperatures, where the vapor pressure is small, the results 

 given by the equation are invariably, and usually very consid- 

 erably, too large. But at higher temperatures the results are 

 correct. 



3. Crompton's equation was shown at the critical temper- 

 ature to give results confirming the law of attraction assumed. 

 (Equations 21 and 22.) 



o--X- 



a rx ,. 8P 287500 g v 



4. It was shown that, >rTA - = == , within cer- 



T m V — v 



tain limits. 



5. It was shown that at the critical temperature the fol- 

 lowing relations hold true: 



ST Ws 



