INGESTION OF PROTEIN DIETS. 



267 



piratory quotients remained relatively constant throughout the whole 

 experimental period, averaging 0.85. Both carbon-dioxide production 

 and oxygen consumption showed a maximum increase in the first 

 2-hour period, while that for heat production occurred in the third 

 period. The maximum percentage increases were 39 per cent for the 



TABLE 198. A. H. M., April 5, 1907. Sitting. (2-hour periods.) 



Beefsteak: 



Amount, 777 grams; nitrogen, 35.68 grams; total energy, 1,617 cals. 



Fuel value: Total, 1,305 cals.; from protein, 70 p. ct. ; from fat, 30 p. ct. 

 Basal values (March 6 and 9, 1907): CO 2 , 51 grams; O 2 , 46 grams; heat, 164 cals. 



^Subject ate beefsteak in lj hours. 



carbon-dioxide production, 35 per cent for the oxygen consumption, 

 and 25 per cent for the heat production. As there was a large 

 increment in the last period, it is quite clear that the influence of 

 the beefsteak on the metabolism had not ceased at the end of the 

 experiment. The computation of the total increment and the total 

 percentage increase can therefore have but little quantitative value, 

 but as the figures have a general interest they are given in table 198. 

 There was a total increment of 63 grams in carbon-dioxide production, 

 46 grams in oxygen consumption, and 136 calories in heat production. 

 A. W. W., April 6, 1907. Essentially the same amount of food was 

 taken in this experiment as in that on the preceding day with A. H. M., 

 ?'. e., 755 grams, with a total nitrogen content of 34.67 grams. The 

 results, including the data for the nitrogen excretion, are given in 

 table 199. The basal values used were averages of the results obtained 

 in two experiments made from 2 to 3 weeks previous to the experiment 

 with beefsteak. A noticeable increase in carbon-dioxide production 

 occurs in all periods, the maximum amount being obtained in the third 

 period. The maximum oxygen consumption appeared in the second 

 period, while the maximum heat production was found in the fourth 

 period. The course of the respiratory quotient was somewhat irregu- 

 lar. Since there are material increases in the fourth period, it is 

 evident that here again we have not obtained the total effect of the 



