500 PHYSIOLOGY AT THE FARM. 



these dietaries the amount of carbon is remarkably high. In 

 the diet of convalescents, or that which is sufficient to support 

 the life of a man without exercise, the proportion of carbon 

 is no more than 6.5 oz. ; in the mean subsistence diet, or 

 that of prisoners and the like, the proportion of carbon is 

 estimated at 7.469 oz. ; in the mean of soldiers' diet during 

 peace, the proportion of carbon is made 11.642 oz. ; in the 

 mean soldiers' diet during war, the proportion of carbon is held 

 to be 12.71 oz. ; in the mean diet of the Royal Engineers 

 (the sappers and miners), engaged even during peace in labo- 

 rious work, the proportion of carbon is stated at 14.844 oz. 

 Thus, to found on this highest proportion assigned to the 

 carbon of the daily food viz., 14.844 oz. the total work 

 performed by the animal frame will be represented by the 

 lifting of 10,170,328 Ib. through one foot, a number very 

 considerably exceeding that brought out a few pages back. 

 This last high number is obtained on the assumption that one 

 oz. of carbon, in combining with oxygen, yields as much heat 

 as is sufficient to raise 14,200 oz. of water to one degree of 

 higher temperature according to Fahrenheit's scale. 



Thus : if 1 oz. of carbon in burning elevate 14,200 oz. of 

 water one degree, then 14.844 oz. of carbon will elevate 210,784 

 oz. of water one degree, as follows : 



1 : 14,200 :: 14.844 : 210,784.8 



but 810,784 Wlbb 



lo 



Again, the heat required to raise every one of 13,174 Ib. of 

 water one degree, suffices for the mechanical effect of raising 

 772 Ib. to the height of one foot; therefore, 13,174 X 772 

 = 10,170,328, the number of pounds' weight raised to the 

 height of one foot by the combustion with oxygen of 14.844 

 oz. of carbon. 



Grounds of doubt on the foregoing statements. A doubt 



