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PROCEEDINGS OF THE AMERICAN ACADEMY 



table very much to give the complete calculation of the equivalent 

 from these selected two by two, I have sometimes given tables of these 

 parts. As the labor of looking up and reducing these is very great, 

 it is very possible that there have been some omissions. 



1 have taken the table published by the Physical Society of Berlin, 1 

 as the basis down to 1857, though many changes have been made 

 even within this limit. 



I shall now take up some of the principal methods, and discuss them 

 somewhat in detail. 



Method from Theory of Gases. 

 As the different constants used in this method have been obtained 

 by many observers, I shall first give their results. 



TABLE XXVII. — Specific Heat of Gases. 



TABLE XXVIII. — Coefficient of Expansion of Air under Constant 



Volume. 



* Taking mean of results on page 101 of Rel. dcs Exp., torn. ii. 



