THE NEW EARTH 



source of stored-up fuel against a day of dis- 

 ease or sickness. In the words of Professor 

 Atwater, the differences between the material 

 taken into the body by the man who is in the 

 test, and the material given off from his body 

 during the test, is the balance of matter — it 

 shows whether or not the body is gaining or 

 losing material; while the diiFerence between 

 the energy of the food he eats and the energy 

 given off from the body as heat and muscular 

 work and waste, is the balance of energy, and 

 should equal the energy of the body material 

 gained or lost. The following table, though 

 somewhat extended, is of interest in this con- 

 nection. It is taken from the bulletin of the 

 United States Department of Agriculture on 

 the subject, and gives, in a condensed form, the 

 now generally accepted facts in Europe and 

 America as to the nutritive value of foods, 

 their waste, their chief constituents, and their 

 fuel value per pound of material in calories. It 

 will be found that this table will warrant ex- 

 tended consideration on the part of any one in- 

 terested in the sensible study of foods and food 

 values, and will prove valuable for reference 

 when any particular food is under discussion: 



^64 



