A Study of the Diet and Metabolism of Eskimos. 45 



nature of the substances catabolized. The metaboHsm during sleep 

 per kg. and hour is slightly different for the different pairs of sub- 

 jects (1.30 — 1.14 calories). 



The specific dynamic action of the protein catabolized has been cal- 

 culated from all the 8 hour periods taken in two groups and works 

 out as 8.6 + 5.0 °/o of the caloric value of the protein catabolized. 



According to our experiments the Eskimos would appear therefore 



to be able to retain a large amount of protein for a certain period 



exceeding 24 hours and to utilize it as a source of energy with very 

 little loss. 



APPENDIX. 



Tables showing composition of feces, excretion of urine and nitrogen, heat of 

 combustion of some urines and data of respiration experiments. 



