as applied to Gases and Vapours. 

 For Atmospheric Air, 



where log a=0"3176168, and consequently 



629 



E 



TiMPo Cl C-}-100° \nM/ J 



>. 



log 



C + 100° 



= 3-7440490 



(26) 



The value of log p is 



3-5612995. 



The following table shows that those empirical formulse accu- 

 rately represent the experiments, the greatest differences being 

 less than one-half of -0000136, which M. Regnault, in the 

 seventy-first page of his memoir, assigns as the limit of the errors 

 of observation due to barometric measurements alone. 



As the coefficient E for hydrogen has been determined for one 

 density only, it is impossible to obtain an empirical formula for 

 that gas. The single ascertained value of E is nevertheless in- 

 serted in the table. 



Table of Coefficients of Increase of Elasticity with Temperature 

 at Constant Volume. 



