14 



Professor Apjohn upon a new Method of 



on atmospherical air. The analysis of the gas was next very carefully performed, 

 and It having been ascertained that n volumes e. g. of atmospheric air per cent, 

 were present, the proper correction was applied by the formula 



{a—c)n 



azza- 



100-w' 



in which c =: .267 is the specific heat of air, d the true specific heat of the gas, 

 and a the specific heat of mixture of gas and air as previously determined. 

 Such was the course pursued in the case of each of the gases submitted to 

 experiment. 



The particulars of the entire series are comprehended in Tables (1) and (2), 

 the first of which relates to air alone, the second to the different other gases. 

 Table (3) contains the final results, alongside of which are placed the numbers of 

 De la Roche and Berard, and thof?e of Dulong, for the purpose of comparison. 



(1) 



