DIET OF REST AND DIET OF LABOUR IN THE HORSE. 509 



to these dietaries, we assume, for greater simplicity, the aver- 

 age amount of carbon in the ilesh-formers and heat-givers con- 

 cerned to be 47 per cent ; and cut off minuter fractional parts. 



In the diet of the horse at rest now referred to, there are 

 29.2 oz. of flesh-formers, and 150 oz. of heat-givers and fat- 

 makers, the sum being in round numbers 179 oz. The amount 

 of carbon is thus found, 100 : 47 :: 179 : 84. 



In the work-diet there are 251 oz. of heat and fat-givers, 

 and 59.1 oz., from our tables, of flesh-formers, the sum of both 

 being 310 oz. The amount of carbon is thus found, 

 100 : 47:: 310 : 145. 



To find the number of foot-pounds corresponding to the 

 carbon in the diet of rest : 



14,200 X 84 = 1,1 92,800, number of ounces of water raised 

 one degree of Fahr. by the combustion of 84 oz. of carbon. 



i 1 Q9 sno 



= 74,550, number of pounds in 1,192,800 oz. 



74,550 x 772 = 57,552,600, the number of pounds raised 

 to the height of one foot by the combustion of 84 oz. carbon. 

 To find the number of foot-pounds corresponding to the 

 carbon in the work-diet : 



14,200 x 145 = 2,059,000, number of ounces of water raised 

 one degree of Fahr. by the combustion of 1 45 oz. of carbon. 



-= 1,286,875, number of pounds in 2,059,000 oz. 

 16 



1,286,875 X 772 = 99,336,749, the number of pounds raised 

 to the height of one foot by the combustion of 145 oz. of 

 carbon. 



Thus, the difference between the whole energy when the 

 animal is at rest and the whole energy when under labour, 

 amounts in round numbers to 41 millions of foot-pounds. 

 This far exceeds the daily labour of which a horse is capable 

 under any possible data ; but it seems certain that outward 



