216 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



is, the one computed from the logarithmic equation. These combine 

 both his own air thermometer and melting point work. Above 

 lOOC^ the logarithmic values are probably slightly too high. 



TABLE X. 

 Barus Melting and Boiling Points. 



Remark. 



Review of the laborious researches which have been devoted to 

 the direct comparison of thermo-electric elements with the air ther- 

 mometer, mainly for the purpose of advancing the art of pyrometry, 

 has enforced the conviction that, at least for the immediate future, 

 this end would be better served by accurate gas thermometer meas- 



