INGESTION OF PROTEIN DIETS. 



281 



increment in oxygen consumption was irregular after the first four 

 periods and reached a basal value in the seventh period, but again 

 increased in the last period. The increment in heat production was 

 found in all of the periods but the last two, when values slightly below 

 the basal were obtained. 



C. H. H., January 18, 1911. The results of the experiment are given 

 in table 212. As a result of the ingestion of 213 grams of beefsteak 

 with a nitrogen content of 9.91 grams, and 20 grams of potato chips, 

 the carbon-dioxide production showed a slight increment in all of the 

 periods; the only notable increase was that in the third period. As the 

 basal value was obtained on the same day, the slight gains can not be 

 attributed to inaccuracy of the base-line. Both oxygen consumption 

 and heat production showed a similar general picture of small incre- 

 ments, with the maximum in the third period. As the basal values 

 had not been reached at the end of the experiment, it is probable that 

 the influence of the ingestion of food was still in effect. 



TABLE 212. C. H. H., January 18, 1911. Sitting. (45-minute periods.) 



Beefsteak and potato chips: 



Amounts, 213 grams beefsteak, 20 grams potato chips; nitrogen, 9.91 grams; total energy, 



547 cals. 

 Fuel value: Total, 460 cals.; from protein, 55 p. ct. ; from fat, 36 p. ct. ; from carbohydrates, 



9 p. ct. 



Nitrogen in urine, 0.25 gram per 45 minutes. 1 



Basal values (January 18, 1911): CO*, 16.5 grams; Oj, 15 grams; heat, 2 45 cals.; respiratory 

 quotient, 0.81. 



'Sample included amount for 4 hours without food preceding the eating of beefsteak and potato 

 chips. 



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



V. G., January 21, 1911. The amount of food taken by this subject 

 was 215 grams of beefsteak, with a nitrogen content of 10 grams, and 

 20 grams of potato chips. The data given in table 213 show incre- 

 ments in carbon-dioxide production for the first three periods, and for 

 oxygen consumption in the first two periods, with a basal value for the 

 latter in the third period and an increase above basal in the fourth 

 period. An increment in heat production was obtained in all of the 

 periods, but that for the third period was slight. If the values for oxv- 



