296 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



effect upon the metabolism, which persisted for the 12 hours of the 

 experiment and showed no indication of ceasing at the end of that 

 time. If we compare the results with those obtained in the preceding 

 experiment, we find the increment in carbon-dioxide production is 

 considerably larger in this experiment and that the increment in heat 

 production is practically twice as large, but that the increment in oxygen 

 consumption is not far from the same in both experiments. This 

 indicates a disparity between the direct and indirect calorimetry, which 

 unfortunately is only too frequent in experiments of this kind. 



H. C. K., May 7, 1906. Only 66 grams of gluten bread were taken 

 in this experiment with 706 grams of skim milk. The nitrogen content 

 of the diet was 13.04 grams, of which 9.44 grams were contained in the 

 gluten bread. The basal values were determined but 4 days previous 

 to the experiment and were thus approximately correct values for use 

 in this experiment. Relatively large increments are shown in table 

 227 throughout the experimental period. The nitrogen excretion 

 increased for the first three periods, but decreased slightly in the last 

 period. Both the nitrogen excretion and the total metabolism indicate 

 that the effect of ingesting this protein food material was still felt at 

 the end of the experiment. 



TABLE 227. H. C. K., May 7, 1906. Sitting. (2-hour periods.) 



Gluten bread and skim milk: 



Amounts, 66 grams gluten bread, 706 grams skim milk; nitrogen, 13.04 grams; total energy, 



672 cals. 

 Fuel value: Total, 558 cals.; from protein, 65 p. ct. ; from fat, 4 p. ct. ; from carbohydrates, 



31 p. ct. 



Basal values (May 3, 1906): CC>2, 51 grams; O2, 47 grams; heat, 164 cals. Nitrogen in urine, 

 1 gram per 2 hours (May 7, 1906). 



'Subject ate food in 37 minutes. 

 CONCLUSIONS AS TO EFFECT OF INGESTING GLUTEN. 



The four experiments with gluten bread and skim milk all indicate 

 a pronounced increment in the metabolism following the ingestion of 

 the food, which in some instances continued for a 12-hour experimental 

 period. This increment was shown not only in the gaseous metabolism 

 and heat production, but also in the nitrogen excretion, which was 



