and in the Condensation of Vapours. 379 



water in the principal receiver 10 or 12 F., it may be 

 supposed that, as soon as I found by this experiment 

 how little heat remained in the products of combustion 

 after they had passed through the worm of the principal 

 receiver, I relinquished my original design of operating 

 with the two receivers joined together. As it was evi- 

 dent, from the above results, that the second receiver 

 could never be sensibly affected, or indicate anything 

 except the confidence I might place in the indications 

 of the first, I resolved to dispense with the trouble of 

 using it. 



It may be seen by the description I have given of 

 this apparatus, that it may be used very conveniently 

 for ascertaining the specific heat of gases, as well as 

 that made apparent in the condensation of vapours, and 

 generally in all researches where the quantity of heat 

 communicated by an elastic fluid in cooling is to be 

 measured. And as it would be extremely easy, by very 

 simple means, to separate completely the products of 

 the vapours condensed in the worm from the* gases 

 that pass through it without being condensed, I cannot 

 avoid hoping that this apparatus will become useful as 

 an instrument to be employed in chemical analyses. 

 This, however, would only be an extension of the 

 method already employed with so much success by 

 M. de Saussure, and by Messrs. Gay Lussac and 

 Thenard. 



As soon as my apparatus was finished, I was eager 

 to see what quantity of heat I should find in the com- 

 bustion of wax and in that of olive oil, that I might 

 afterward compare the results of my experiments with 

 those of M. Lavoisier's ; and, as I have the most 

 implicit reliance on everything published by that excel- 



