72 



THE ANIMAL AS A MACHINE. 



Foot-pounds. 



External work or actual labor 1,011,670 



Work of circulation (75 beats a minute). . . . 500,040 

 Work of respiration (15 a minute) 98,496 



Total ascertainable work per day 1,610,206 



The ascertainable external and internal work of the 

 food we eat is only one sixth of its actual energy, ac- 

 cording to Letheby ; but it is not impossible that the 

 unascertained work of the vascular system and other 

 parts may account for the full amount, nearly. 



According to Dr. Frankland, this power is supplied 

 by food in the following proportions ^ : 



ENERGY-VALUES OF FOODS. 



Name of Food. 



Per Cent 

 of 

 Water 

 in Ma- 

 terial. 



Pounds of Water 

 Raised i° F. 



Pounds Lifted i 

 Foot High. 



When 

 Burnt 

 in 



Oxygen. 



When 

 Oxidized 

 in the 

 Body. 



When 

 Burnt 

 in 



Oxygen. 



When 

 Oxidized 

 in the 

 Body. 





15 



18.68 



18.68 



14.421 



14.421 





24 



11-95 



11.20 



9.225 



8.649 





15 



10.30 



10.10 



7-952 



7.800 





15 



10.12 



9.87 



7.813 



7.623 





15 



10 12 



9-57 



7-813 



7-487 





13 



9.80 



9-52 



7.566 



7.454 





47 



8.82 



8.50 



6.809 



6-559 





19 



8.61 



8.61 



6.649 



6.649 



Entire egg (boiled). . 



62 



6.13 



5.86 



4.732 



4.526 



Bread 



44 



5-74 



5-52 



4-431 



4.263 





54 



5-09 



4.30 



3.929 



3.321 





71 



4.60 



4.14 



3-551 



3.200 





71 



3-38 



3.01 



2.609 



2.324 





71 



3.38 



3.01 



2.609 



2.324 





73 



2.60 



2.56 



2.007 



1.987 



Milk 



87 



1.70 



1.64 



1.312 



1.246 





86 



1.36 



1.33 



1.050 



1.031 





89 



1. 12 



1.08 



.864 



.834 



* Frankland on Food of Man, 1887, p. 68. 



