THE WORK OF SADI CARNOT. 13 



tures des corps entre lesquels sefait, en dernier re- 

 sultat, le transport du calorique." 



" Lorsqu'un gaz passe, sans changer de tempera- 

 ture, d'un volume et d'une pression determines a une 

 autre pression egalement determinee, la quantite 

 de calwique absorbee ou abandon?iee est toujours la 

 meme, quelle que soit la nature du gaz choisi comme 

 sujet a" experience." 



Perhaps as remarkable a discovery as any one of 

 the preceding (and one which, like those, has been 

 rediscovered and confirmed by later physicists ; 

 one which was the subject of dispute between 

 Clausius, who proved its truth by the later methods 

 which are now the source of his fame, and the 

 physicists of his earlier days, who had obtained 

 inaccurate measures of the specific heats of the 

 gases; values which were finally corrected by Reg- 

 nault, thus proving Carnot and Clausius to be 

 right is thus stated by Carnot, and is italicized 

 in his manuscript and book : 



" La difference entre la clialeur specijique sous 

 pression constante et la clialeur specijique sous vo- 

 lume constant est la meme pour tous les gaz." 



He bases his conclusion upon the simplest of 

 thermodynamic considerations. He says that the 

 increase of volumes with the same differences of 

 temperature are the same, according to Gay-Lussao 



