A Study of the Diet and Metabolism of Eskimos. 



31 



the fact that there is always a retardation in the excretion of urea 

 as compared with its formation. They think that the CO^ produced 

 in the catabohsm of protein will appear earlier in the expired air than 

 the urea in the urine. 



Our curves bear out the observations of our predecessors and 

 give some additional information. As the subjects could not be in- 

 duced to urinate at stated intervals we were obliged to take the samples 

 as we could get them and then calculate the excretions per hour for 

 each period. 



In the curves we have given the excretion of water in cc. and 

 of nitrogen in gr. per hour and we have added a third curve showing 



300\- 



200^ 



f\Unne_ çç^rjt. 



-1 1 1 Г- 



19 7 fålO 8 



— I 1 Г- 



14 7 1?14 в 



T 1 1 г 



CM 



-МД 



>Уг 'Vi '^1 



Fig. 10. Exp. I. Urine curves. 



the concentration of N in each sample of urine (gr. N in 100 cc). 

 The figures put on the top of each curve are placed against the time 

 of the nitrogen meals and indicate the number of gr. N taken. 



We would draw attention to the following facts concerning the 

 curves: 



1. The general similarity of the curves for the two subjects in 

 the same experiment. This similarity is very apparent in exp. II, 

 III and IV, much less so in exp. I in which the individual excretions 

 have been influenced by the irregular drinking of water. 



2. The nitrogen metabolism begins immediately after absorp- 

 tion, and Oppenheim ^ has found that the excretion begins to rise 

 in the second hour after a nitrogen meal. 



1 Pfl. Arch., 23, 1880, 446. 



