246 PROCEEDINGS OF THE AMERICAN ACADEMY 



"Within the limits of 730 and 760 mm. the temperature varies 

 almost directly as the pressure, so that the expression 



t° = 218.07 + 0.0625 (H— 760), 



serves to give the boiling point of naphthaline under any ordinary 

 atmospheric pressure, If, expressed in normal millimeters of mercury. 

 This and subsequent similar ones may probably be used safely up to 

 780 mm. The following table serves to compare our results with 

 those of Crafts. 



[N. B. — In Crafts's original tables appear the erroneous values 753.90- 217°.8, 

 755.31 -217°.9. These pressures should be about 755.60 and 757.31, respectively, 

 as inspection will show.] 



Benzophenone. 

 Observed Pressures and Temperatures. 



