9 2 



SCIENCE OF THRESHING. 



This shows a total useful combustible of 86j4 per 

 cent., of which 26% per cent, is volatilized. While 

 the decomposition proceeds, combustion proceeds, and 

 the 26^4 per cent, of volatilized portions, and the 

 60 per cent, of fived carbon, are successively burned. 



TABLE NO. 2. 



Total heat evolved by various fuels and their 

 equivalent evaporative power, with the weight of 

 oxygen and volume of air chemically consumed. 



