in Comhistion^ and in the Condensation of Vapours. 293 



Before comparing the result of this experiment with that 

 of an experiment made with the sanie substance by M. 

 Lavoisier, I shall give an account of two other experiments 

 made by myself with wax, and my readers will no doubt 

 be struck with the uniformity of their results. It is in 

 fact so remarkable, that I should scarcely dare to publish 

 them, if I had not proofs that all my experiments were 

 really made and registered before commencing any calcula- 

 tion on their results, and if I was not certain that those who 

 prefer adopting my method, by using the same apparatus, 

 will have the same results, if they repeat my experiments. 



As the method of proceeding in making these experi- 

 ments ought to be now well known, I can without incon- 

 venience suppress the details, and give only the results of 

 the experiments. 



I shall begin with three experiments made with bees 

 wax ; and in order to render them easy to be compared, I 

 shall present them together in a table. 



If we take the mean term between the results of these 

 three experiments, we shall find that the quantity of heat 

 developed in the combustion of wax is such, that a pound 

 of this substance is sufficient to heat and boil 94*682 

 pounds of water at the freezing point : consequently one 

 pound of wax ought to be sufficient, when burnt, to melt 

 126-24 2 poimds of ice. 



In the experiments of M. Lavoisier, the heat developed 

 in the combustion of a pound of bees wax was sufficient to 

 melt 133-166 pounds of ice. 



The difference between the results of our experiments 



made with this substance is not very great; and if those of 



M. Lavoisier were made at a time when the temperature 



T3 of 



