A Study of the Diet and Metabolism of Eskimos. 



37 



DAHL and EsBACH determinations ^ that the latter give lower results 



than the former, and since the percentage of urea increases with in- 



. Kjeldahl N . 

 crease of total nitrogen the ratio 



EsBACH TV 

 days with a large excretion of nitrogen. Table 5 shows the relations 



between the nitrogen excretion and the ratio 



is diminished on the 



5 shows the r 

 Kjeldahl N 



EsBACH N 



on the 



separate days examined. 



Table 5. 



As mentioned above the reagent employed would liberate 90.6 "/0 

 N from urea and 95.5 "/0 from ammonia. If we take the quantity of 

 ammonia nitrogen as 4 "/0 of the urea nitrogen we have for both taken 

 together a yield af 90.8 "/q. We estimate the average yield from all 

 other nitrogenous substances at 20 %. The reasons for adopting 

 this estimate are given in the paper quoted above, but it is obvious 

 that since the relative quantities of these different substances is not 

 quite constant the estimate can only be approximative. Putting the 

 quantity of urea + ammonia nitrogen = x and the endogenous ni- 

 trogen = ?/ we have on the above assumptions: 



1 In the EsBACH determinations we have not used the baroscope, which is 

 a very unreliable instrument, but we have calculated the weight of nitrogen from 

 the volume and pressure of the gas and the temperature of the waterbath em- 

 ployed. 



