148 



APPENDIX TI. 



the chlorate of potash was decomposed in the defla- 

 grations, and that but mere traces of carbonic oxide 

 were produced. 



Joule's mechanical equivalent of heat was em- 

 ployed, viz., 1 kilogram of water raised 1 C. = 423 

 metrekilograms of force, or one unit of heat. 



The following results were obtained : 



Actual energy developed lyone gram of each substance when 

 "burnt in oxygen. 



It is evident that the above determination of the 

 actual energy developed by the combustion of muscle 

 in oxygen represents more than the amount of 

 actual energy produced by the oxidation of muscle 

 within the body, because, when muscle burns in 

 oxygen its carbon is converted into carbonic acid, 

 and its hydrogen into water ; the nitrogen being, to 

 a great extent, evolved in the elementary state ; 



* Got by multiplying units of heat by -423. 

 f The speaker showed the combustibility of urea by 

 burning it upon asbestos in a jar of oxygen gas. 



