Metabolism Experiment No. "71. 



123 



Table 74 shows that the total heat production was greatest on the first day 

 and smallest on the last day. The extra heat eliminated as a result of the 

 muscular work during the second period of the first day was markedly evident, 

 for on the first day there were 276.83 calories produced as against an average 

 of less than 165 calories for the corresponding period of the remaining days. 



Balance of Energy. 



Table 75 shows the method of deriving the computed heat production and 

 the comparison of these results with the heat production as measured. 



It is true of this experiment, as of No. 69, that the total energy derived 

 from different sources was on each day larger than the heat production as 

 measured. The smallest discrepancy occurred on the second and the largest 



Table 75. Comparison of energy derived from katabolized body material with total 

 heat production Metabolism experiment No. 11. 



on the third day. These discrepancies were respectively -4-0.9 and -f-3.1 

 per cent of the measured heat production. The average discrepancy for the 4 

 days was -f-40 calories or +2.2 per cent. While the percentage error is 

 considerably greater than might be expected from the previous experiments 

 made with this apparatus and from the results of a large number of alcohol 

 check tests made with it, nevertheless in considering these percentage errors 

 it is important to note that the actual quantity of heat measured is much 

 smaller than in any experiment heretofore recorded. On the fourth day of 

 this experiment the heat production was little over 1600 calories. 



Relations of Oxygen Consumption, Caebon Dioxide Elimination, and Heat 



Production. 



The oxygen and carbon dioxide thermal quotients and the respiratory 

 quotients for the different periods of the 4 days of the experiment are given 

 in table 76. 



