1 98 



PLANT PRODUCTS 



feeding equivalents. The figures in Table 25 refer to a man 

 at ease, in temperate climates. A man at perfect rest, 

 lying in bed, would only need about 2000 Calories a day ; 

 with eight hours' hard work, 3250 Calories (Table 26) ; with 

 very hard work, not actually detrimental to health, 3830 

 Calories. 



Table 25. — Human Heat Account. At Ease. 



Radiation (ordinary clothing) 

 Evaporation of water from skin and lungs 

 Heating respired air 



Heating food and water to body temperature 

 Working of heart, etc. 



Total 



Calories 

 per diem. 



1536 



611 



80 



53 

 150 



2430 



Table 26. — Daily Human Rations for Eight Hours' 

 Hard Work. 



One hundred head of population, consisting of mixed 

 men, women, and children, may be considered as equal to 

 seventy-seven men. One " person " needs a million Calories 

 per annum. 



REFERENCES TO SECTION HI 



Maidment, " The Home Dairy," pp. 15, 23. (Simpkin, Marshall.) 

 Wright, " The Composition and Nutritive Value of Mutton and Lamb," 



Journ. Soc. Chem. Ind., 1916, p. 234. 



" Comparative Values of Feeding Stuffs," Journ. Board of Agriculture, 



1915-16, p. 53. 



James Long, " Food and Fitness." (Chapman and Hall.) 



Crowther, "The Feeding of Farm Stock," Journ. Board of Agriculture, 



1912-13, p. 107. 



