OF AGRICULTURE. 45 



sheep, and two pigs. Complete analyses of the ashes, 

 respectively, of the entire carcases, of the mixed 

 internal and other ' offal ' parts, and of the entire 

 bodies, of each of these ten animals have also been 

 made. 



From the data provided, as just described, as to 

 the chemical composition of the different descriptions 

 of animal, in different conditions as to age and fatness, 

 the composition of the increase whilst fattening, and 

 the relation of the constituents stored up in increase 

 to those consumed in food, have been estimated. 



To ascertain the composition of the manure in 

 relation to that of the food consumed, oxen, sheep, 

 and pigs, have been experimented upon. 



The loss or expenditure of constituents, by respir- 

 ation and the cutaneous exhalations, has not been 

 determined directly, but only by difference ; that is, 

 by calculation, founded on the amounts of dry matter, 

 ash, nitrogen, &c, in the food, and in the (increase) 

 faeces, and urine. 



Independently of the points of enquiry here enu- 

 merated, the results obtained have supplied data for 

 the consideration of the following questions : — 



i. The characteristic demands of the animal body, 

 for nitrogenous or non-nitrogenous constituents of 

 food, in the exercise of muscular power. 



2. The sources in the food of the fat produced in 

 the animal body. 



3. The comparative characters of animal and veg- 

 etable food in human dietaries. 



Supplementary investigations have also been made ; 

 for example — on the application of town-sewage to 

 different crops, including experiments on the feed- 

 ing qualities of the produce grown ; the amount of 

 increase yielded by oxen, and the amount and com- 



