268 PRINCIPLES OF ANIMAL NUTRITION. 
In the former case the observed heat production includes the heat 
into which the work was converted. 
The total of all the experiments shows an almost absolute agree- 
ment between the computed and the observed results. To a trifling 
extent, however, this arises from a compensation between the rest 
and work experiments, the computed heat tending to be slightly 
too small in the former and slightly too great in the latter, but the 
agreement in each series is so close as to amount to a demonstra- 
tion of the applicability of the law of the conservation of energy to 
the metabolism of the animal organism. 
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