370 



ISIDOR GREKXWALD 



TABLE III. AMOUNT AND NATURE OF 



1 Figures in parentheses represent "digestible" nutrients. 'See Table II. * After deducting waste of 5% protein, 25% 

 fat and 20% carbohydrate. 4 Includes 254 calories from alcohol. Includes 173 calories per capita, or 228 "per man." from 

 alcoholic beverages, or 112, and 147, respectively, from alcohol. 'Gautier gives total as 102 but total of individual entries is 

 107.5 grams. 7 Includes 354_and 460 calories, respectively, from alcohol. 8 Includes fish, poultry and eggs. 10.5% from 



plums stimulated the excretion of nitrogen into the intestine. Mosenthal 

 (a) (1911) found that in dogs on a mixed diet, which would be a high pro- 

 tein diet for man, the excretion of nitrogen into the intestine was about 35 

 per cent of the intake and that '2-t per cent was later reabsorbed. Hind- 

 hede's results could be explained by an increased excretion of such nitrogen 

 without, compensatory reabsorption. It is quite possible and even probable 

 that such nitrogen has not been completely metabolized and therefore repre- 

 sents as real a loss to the body as if it were unabsorbed food nitrogen but 

 the fact has not yet been fully established. It is just possible that the 

 material excreted into the intestine is as truly a waste product as urea 

 or any other constituent of the urine. However that may be, it is evident 

 from, the observations of Albertoni and Rossi and of Xeumann that "fac- 

 tors of digestibility" derived from certain experiment* cannot properly 

 be used in calculating "digestible protein" under different conditions. See 

 also Rubner(aa) (1918). Therefore, the discussion in this chapter, unless 

 the fecal or urinary nitrogen has actually been determined in the particular 

 observation under discussion, will, unless specifically otherwise noted, 

 be based upon the nitrogen and energy content of the food, the latter 

 being calculated by the iise of Rubner's factors, 4.1 calories per gram of 

 protein or carbohydrate and 9.3 per gram of fat. 



