444 Researches vpon ike Heat developed 



dividing this rmiiiber by 5, we shall see that this carbon 

 ought to be united with 0-1003 pound of free hydrogen, 

 instead of being unised with 0- 1 65 ^ pound, as 'we s~hall 

 sujjpose acrording to M. de Saussure. 



Let us n^vv see if, by adoping the analysis of Mr. 

 Cruickslianks with respect to the hydrogen instead of that 

 oT JVI. de Saussure, the calculation \vill agree better with 

 ihc experiment. 



We have seen that the quantity of water heated to 1S0"» 

 Fahrenheit, which represents the quantity of heat which 

 must be developed in the combustion of the 01 5 pound 

 of alcohol, was 9 9G09 lbs. 



And that the quantity answering to 0-.5015 

 pound of carbon, which exists in the 0'85 of 

 ctl'.er, was 28*89 



We shall for the present add that which 

 answers to the combustion of 0-1003 pound 

 of free combustible liydrogen, which, according 

 to Ml. Cruickshanks, ought to be found united 

 to this quantity of carbon in order to form the 

 ether 41-123 



These three quantities of water together are 

 the measure of the heat which must be deve- 

 loped in the combustion of one pound of sul- 

 phuric ether of the kind employed in my ex- 

 periments 79-9739 



The mean result of five experiments was 80-304. 



This coincidence between the calculation and the ex- 

 periment is doubtless too remarkable to be owing to chance, 

 but I am ready to prove. that it occurred without being 

 foreseen or exp. cted. 



From all these results we may conclude, that one pound 

 of sulphuric ether of the specific gravity 7J 7 at the tem- 

 perature of 16^ Reaumur, or of the same species with that 

 employed by M. de Saussure, this liquid should have fur- 

 nished in combustion enough of heat to raise to 180° F. 

 62-369 pounds of water; viz." 



That furnished by -059 pound of carbon 33'9S9 lbs. 



And that furnished by O'l 18 lb. of hydrogen 4S-386 



82-369 

 If the proportion of free hydrogen in the ether analysed 

 by M. de Saussure was really such as he has determined 

 it to be, one pound of this liquid ought to furnish a suffi- 

 ciency of heat in its combustion to raise to 180"^ of Fah- 

 renheit 113-566 pounds of water, viz. 



That 



