and in the Condensation of Vapours. 38 1 



inflammable substance must furnish enough to heat 

 94.785 grammes of water to the same point. 



Consequently, one pound of white wax, or wax taper, 

 should furnish, in burning, sufficient heat to raise 94.785 

 pounds of water from the temperature of melting ice to 

 the boiling point. 



To find how many pounds of ice this quantity of heat 

 would melt, we have only to add to the number of pounds 

 of water at the temperature of melting ice it would cause 

 to boil the third part of this number, and the sum would 

 express the weight of the ice in pounds. 



This, then, for white wax is : 



94-78$ 

 + 31-595 



= 1 26.380 IBs. of ice melted for I Ib. of the wax burned. 



Before I compare the result of this experiment with 

 that of an experiment made with the same substance by 

 M. Lavoisier, I will give an account of two other ex- 

 periments I made with wax, as the reader will undoubt- 

 edly be struck with the uniformity of their results. This 

 is so remarkable that I should scarcely venture to pub- 

 lish them had I not proofs that all my experiments were 

 actually made and minuted down before I began my cal- 

 culation of their results, and were I not assured that 

 any person who will follow my method, using the same 

 apparatus, will find the same results on repeating my 

 experiments. 



As the mode of operating in making these experiments 

 must now be well known, I may suppress the particulars 

 in what follows without inconvenience, and give only the 

 results of the experiments. 



I will begin with three experiments made with white 



