436 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



ture, and t^ is the final temperature ; P is the vapor-pressure of the 

 liquid at the corresponding temperature t^. The values of the vapor- 

 pressure at the different temperatures were obtained from vapor-pressure 

 curves plotted from the data of Ramsay and Young,^ and of Regnault.^ 

 The mean of the two values thus obtained is given in the first column 

 of these tables. The values of the vapor-pressure given are certainly 

 correct to within a few millimeters of mercury, an accuracy which is 

 quite sufficient for our present purposes. Both the vapor-pressure and 

 the external pressure are expressed in centimeters of mercury. 



TABLE II. 



Expansion of Ethyl Ether. 



6 Phil. Trans., 177, I, 123 (1886). 



7 Mem. do I'Acad., 26, 336 (1862). 



