INGESTION OF PROTEIN DIETS. 



271 



F. M. M., 9 h 26 m a. m. to 3 h 06 m p. m., January 20, 1910. 01.5 kilograms.- 

 Third period lengthened owing to unaccountable variations in the temperature 

 conditions at end of hour. Nitrogen in urine per hour 6 h 45 m a. m. to 10 h 30 m 

 a. m., 0.85 gram. 



DISCUSSION OF EXPERIMENTS. 



/. R., December 4, 1908. The basal value for this experiment was 

 determined on December 3. After the ingestion of 418 grams of beef- 

 steak on December 4, having a nitrogen content of 15.30 grams, an in- 

 crement in the carbon-dioxide production was noted in all of the eight 

 periods, although the values had nearly reached the basal level in the 

 last period (see table 202) . Noticeable increments in the oxygen con- 

 sumption were also found throughout the experiment ; even in the eighth 

 hour there was a consumption of 4 grams more than the basal re- 

 quirement. The heat production was likewise increased in all of the 

 periods. The maximum increments for carbon-dioxide production and 

 oxygen consumption were noted in the third hour of the experiment, 

 while that for heat production was found in the first period. The total 

 increment, both in carbon-dioxide production and in oxygen consump- 

 tion, was 31.5 grams; in heat production it was 104 calories. As the 

 basal level had not been reached at the end of the experiment, the 

 stimulus of the beefsteak was apparently still effective. The large ex- 

 cretion of nitrogen in the urine, with a total increment of 7.80 grams 

 for the 8 periods, indicates a considerable katabolism of protein during 

 the experiment. 



TABLE 202. J. R., December 4, 1908. Sitting. (1-hour periods.) 



Beefsteak: 



Amount, 418 grams; nitrogen, 15.30 grams; total energy, 737 cals. 



Fuel value: Total, 603 cals.; from protein, 65 p. ct.; from fat, 35 p. ct. 



Based values (December 3, 1908): CO2, 26.5 grams; O2, 23.5 grams.; heat, 1 74 cals. Nitrogen 

 in urine, 0.38 gram per hour (December 4, 1908). 



*Heat eliminated corrected for change in body-weight, but not for change in body-temperature. 



