and in the Condensation of Vapours. 399 



If the proportion of free hydrogen in the ether ana- 

 lyzed by M. de Saussure was really such as he has deter- 

 mined it to be, one pound of this liquid ought to furnish 

 a sufficiency of heat in its combustion to raise 113.566 

 pounds of water 180 F., viz. : 



That furnished by 0.59 Ib. of carbon . . . 33.989 Ibs. 

 And that which was furnished by 0.194091 of hy- 

 drogen 79-577 



113.566 



But I can the less persuade myself that this liquid can 

 furnish in its combustion so much heat, because one 

 pound of white wax furnished no more than what was 

 sufficient to heat 94.682 pounds of water the same num- 

 ber of degrees. 



According to the analysis of M. de Saussure, 100 parts 

 of sulphuric ether, of the specific gravity of 717, at 16 

 Reaumur, are composed of 



Carbon 59 parts 



Hydrogen 22 



Oxygen 19 



Supposing that the 19 parts of oxygen are combined 

 with 3.6 parts hydrogen, so as to form with them 21.6 

 parts water, 100 parts of this kind of ether ought to be 

 composed of 



Carbon ......... 59 



Free and combustible hydrogen .... 19.4 



Consequently, inflammable substances . . . 78.4 



Water . 21.6 



