THE FOODS OF THE NEW EARTH 



is expanded to a large cavity, so to call it, — a 

 room, — and the steel walls of the bomb to the 

 copper-lined walls of the room. In place of a 

 pellet of squash in the bomb, a man is placed 

 in the room and on him tests are made, abso- 

 lute, though not so heroic in character as those 

 which burned the little pellet to ash. Still, the 

 test made is precisely as accurate. Out of this 

 respiration calorimeter is coming some of the 

 most valuable and practical information which 

 has been developed in the period of the New 

 Earth. A man is kept in this room for a cer- 

 tain number of days — say a week or a fort- 

 night. As in the case of the young men under 

 test referred to above, — though they went 

 about their regular work in the open as usual, 

 — full and accurate data and records are kept 

 of everything pertaining to the man in the cage, 

 together with the composition of the foods fed, 

 their amount, and so on. But much more is 

 done than this. Not only is every particle of 

 waste determined, and how much food is left 

 unconsumed in this waste as it comes from the 

 intestines and kidneys, but how much waste 

 is given off through the lungs in breathing. 

 More than this, too, every particle of muscular 



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