28 August Krogh and Marie Krogh, 



The protein intake on the meat days fell considerably short of 

 our expectations but still we believe it to be the highest on record 

 for man. 



The weights and compositions of the feces voided by each in- 

 dividual during the experiments and for one to two days afterwards 

 are shown in the appended table I. The figures for the feces which 

 we consider as belonging to the meat days are printed in larger 

 type. The figures for feces belonging to the carbohydrate days are 

 printed in italics. The meat feces are characterized by a somewhat 

 higher percentage of nitrogen varying between 1.20 and 2.89 — mean 

 1.63 %, while the mean for a diet containing a small proportion of 

 nitrogen only was about 1.3 "/q. 



In the case of A. M. the percentage of fat, saponified as well as 

 well as unsaponified, was distinctly higher in the meat feces than in 

 the other, but for the other subjects this is not so and considered per 

 day the quantity of fat in the feces is by no means always higher after 

 the intake of large amounts of that substance together with protein. 

 On the whole the feces contain rather much fat of which generally 

 about one half is present as soaps and consequently not extractable 

 with ether before treatment with acid. 



The energy content of the feces per gr. N is apparently slightly 

 lower after meat than after carbohydrate. 



On the whole the analyses show that the excessive amounts of 

 protein and fat taken on the meat days are remarkably well utilized 

 in the intestines of Eskimos; the loss of energy in the feces amounting 

 on an average to about 350 Cal. per meat day or 7 to 10 "/o of 

 energy of the food. 



The nitrogen balance. 



Table 3 shows the amount of nitrogen ingested with the food 

 on each separate day reckoned from midnight to midnight. On the 

 first and last day of each experiment the subjects have not been con- 

 fined for the whole of the 24 hours and the corresponding quantities 

 of iV are put in brackets. 



The second column shows the amounts of iV in the corresponding 

 feces. It must be borne in mind that these figures are not wholly 

 reliable as the separation of the feces was rather incomplete. It is 

 obvious however that even the largest amounts of nitrogenous food 

 are practically completely digested and absorbed. The quantities 

 of N in the feces belonging to the meat days are only slightly if at 

 all higher than those belonging to carbohydrate. The figures on which 

 this conclusion can be based are A. S. ^^/^ and ^^/y showing nitrogen 

 in food of 11 and 83 gr. and in feces of 2.8 and 3.2 gr. The corre- 

 sponding figures for N. D. are 11 gr., 79 gr., 2.6 gr. and 6.2 gr. showing 

 a distinct rise in the excretion of TV after the meat. In most of the 



