402 On the Heat developed in Combustion 



distillation, and its specific gravity at the temperature of 

 56 F. was 827.31. 



The following are the details and results of two ex- 

 periments made with this liquid on the 29th of January, 

 1812. 



The capacity of the calorimeter for heat was equal to 

 that of 2781 grammes of water. 



The naphtha was burned in the same small lamp 

 which I had employed in my experiments made with 

 alcohol and sulphuric ether; but as I had not been able 

 to succeed in burning the naphtha without smoke, I 

 cannot rely implicitly upon the results of these experi- 

 ments. Perhaps with pure oxygen gas we might succeed 

 in burning it entirely. 



I have met with the same difficulty in burning oil of 

 turpentine and colophon ; and for this reason I thought 

 it would be useless to detail my experiments with these 

 two substances. 



SECTION VI. On the Quantity of Heat developed in the 

 Combustion of Tallow. 



Having procured tallow candles of a good quality, 

 those which are called six in the pound, I burned one un- 

 der the calorimeter, taking care to keep it well snuffed, 

 in order to avoid smoke. 



