450 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



TABLE XI. 

 Ether. 



Examination of Table.s X and XI shows that the vahies of a ob- 

 tained from my data are in very close accord with those calculated 

 by Professor ilall from the data of Amagat. Indeed, if the bracketed 

 estimates of a given in Table XI were continued by extrapolation to 

 the state of no external pressure, or an external pressure less than 

 one atmosphere, the "20° column would begin with the number 542, 



