A Study of the Diet and Metabolism of Eskimos. 9 



We made four series of experiments, each on two subjects. Our 

 first two subjects were females, the other males. During each series 

 the subjects were confined in the respiration chamber for the whole 

 of the time, that is about 4 days. The first series showed some defects 

 in the arrangements and working, and we found especially that on 

 sunny days with little wind the temperature in the chamber might 

 rise to such a height as to be uncomfortable. A cooling arrangement 

 was therefore provided. During the three last series everything went 

 well. The amount of work which we had to perform during the ex- 

 periments was rather large, and we could not do so much as we wished 

 to. A regular watch was held throughout the day but during the 



before going in 



The female subjects 



Fig. 5. 

 after comino- out. 



night one respiration period was arranged to last from about 10 to 

 about 3, and during that time one of us slept in a sleeping bag in the 

 laboratory tent. 



In addition to the work of attending the experiment, sampling 

 and weighing foods, urine etc., about 20 gas analyses of the greatest 

 possible accuracy had to be made each day during the experiment, 

 while about 40 — 50 samples were left for analysis afterwards. We 

 made, moreover, a considerable number of urea determinations on the 

 urine by means of the Esbach method in order to obtain a provisional 

 idea of the results and also with a view to utilizing them in case some 

 of the samples should be lost during the long transport from Green- 

 land to Copenhagen and from here to Boston, 



