382 On the Heal developed in Combustion 



wax; and to render them more easy to compare, I will 

 give them together in a tabular form. 



Results of three Experiments on the Burning of white Wax, showing the 

 Quantity of Water that would be heated 1 80, or of Ice that would 

 he melted, by one pound Weight of it. 



If we take the mean term between the results of these 

 experiments, we shall find that the quantity of heat de- 

 veloped in the combustion of wax is such that one pound 

 of this substance is sufficient to raise 94.682 pounds of 

 water from the temperature of melting ice to the boiling 

 point, and consequently that it should melt 126.242 

 pounds of ice. 



According to the experiments of M. Lavoisier, the 

 heat developed in the combustion of one pound of white 

 wax was sufficient to melt 133.166 pounds of ice. 



The difference between the results of our experiments 

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

 M. Lavoisier were made at a time when the temperature 

 of the air was only a few degrees higher than that of 

 melting ice (which I have no means of ascertaining), the 

 quantity of nitrogen that must have entered into the 

 calorimeter, with the oxygen employed to support the 

 combustion, would have been so great as to account suf- 

 ficiently for the difference. But the very great difference 



