and in the Condensation of Vapours. 39 1 



As the apparatus I have employed has now been de- 

 scribed, it will be easy to follow the steps of my experi- 

 ments, and to appreciate their results. I will endeavour 

 to describe them clearly, but also as briefly as possible. 



Having procured a stock of spirit of wine of the shops, 

 and of alcohol of different degrees of purity, I ascertained 

 with the greatest care their specific gravities at the tem- 

 perature of 60 F., taking that of water at the same tem- 

 perature as 1000000. I chose this temperature that I 

 might afterward the more easily ascertain the quantities 

 of water that each ought to contain, according to the 

 tables constructed from the experiments of M. Lowitz. 



The following table will show the specific gravity of 

 each, and the quantity of pure alcohol of Lowitz and of 

 water contained in it. 



The following are the results of the experiments made 

 to ascertain the quantities of heat which these liquids fur- 

 nished in burning. 



In three experiments made with the spirit of wine the 

 quantities of heat manifested were, 



In the ist, 53.260 Ibs. of water raised from the temperature of 

 " zd, 51.727 " melting ice to that of ebullition. 



" 3^ 52-855 " 

 The mean result is . ... . . 52.614 Ibs. 



As a pound of this liquid contained but 0.7788 of the 

 alcohol considered by Lowitz as pure, the other part 



