BASAL METABOLISM. 



77 



Hence the values for 1906 and 1907 are averaged separately. The 

 average carbon-dioxide production per two hours for A. L. L. during the 

 spring of 1906 was 47 grams; a year later the average of two experi- 

 ments showed 53 grams. Similar variations were observed in the oxy- 

 gen consumption, the average value for 1906 being 42 grams, while 

 that for 1907 was 46 grams. The average heat production was 148 

 calories in 1906 and 165 calories in 1907. 



TABLE 25. Basal metabolism of H. R. D. at different times of day in calorimeter experiments, 

 subject in sitting position. Middletown. (Values per 2 hours.) 



*The beginning of the "First two hours" was for this subject approximately between 8 h 30 m 



a. rn. and 9 h 45 m a. m. 

 Calculated to 2-hour basis; measured in period of lj hours. 



With the subject A. H. M. the basal metabolism determined on 2 

 days in the middle of February 1906 showed a distinctly lower value 

 than the basal metabolism determined in the fall of 1906 and spring of 

 1907. Thus, the average carbon-dioxide production for February 

 1906 was 45 grams, the oxygen consumption was 40 grams, and the 

 heat production was 142 calories, while the average values for the three 

 experiments in the period from November 22, 1906, to March 9, 1907, 

 was 51 grams for the carbon-dioxide production, 45 grams for the oxy- 

 gen consumption, and 162 calories for the heat production. It is thus 

 clear that with these two subjects we have a variation of at least 10 

 per cent, as shown by these duplicate experiments. 



