EXPERIMENTS WITH SUBJECT STANDING. 95 



on October 27, 1915, to a maximum of 225 c. c. on February 21, 1916. 

 The maximum of 225 c. c. per minute on February 21, 1916, is the 

 maximum of a group of high values for carbon-dioxide elimination after 

 several days of somewhat strenuous exercise in walking at 40 per cent 

 grade. Moreover, it was obtained in a single period, and therefore may 

 not fairly represent the daily average, but has been included with the 

 data for the other days in averaging. 



The daily average for the 71 days of experimenting with this subject 

 is 199 c. c. per minute. A direct comparison of the carbon-dioxide 

 values from day to day can only be made with due regard to changes 

 in body-weight. These actually did take place, but the average value 

 for the whole series, i. e., 199 c. c., is to be considered as referable to a 

 body-weight varying only from 57 to 59 kg. 



OXYGEN CONSUMPTION. 



As with the carbon-dioxide elimination, the apparently abnormal 

 values for H. R. R. obtained on the first day of experimenting with 

 him are not included in the daily average for this subject. The aver- 

 age for the two days remaining is 281 c. c. per minute. The daily 

 average oxygen consumption for W. K. varied from 212 c. c. on 4 days 

 to 257 c. c. per minute on March 17, 1915. The average was 228 c. c. 

 for the 14 days when standing experiments were made. In the 71 days 

 with E. D. B., the average oxygen consumption for the day was 240 c. c. 

 per minute, with range from 206 c. c. on November 18, 1915, to 288 c. c. 

 on February 23, 1916. The daily averages for this subject show two 

 distinct periods, the values being lower from October to December, 

 and considerably higher after the Christmas recess and during the 

 spring months. During this period E. D. B. gained in body-weight, 

 and as these figures represent the total oxygen consumption, it would 

 appear that his standing metabolism was increased. When, however, 

 allowance is made for this increase in weight, as is done in table 21 

 (see p. 99), it is seen that his metabolism per kilogram of body- weight 

 is but slightly greater. 



RESPIRATORY QUOTIENT. 



The average respiratory quotients for the subjects standing, as 

 given in tables 3 to 7, are what would be expected for men of this class. 

 The relatively low average value of 0.77 for H. R. R. may possibly be 

 explained by the fact that this man was earning his way through col- 

 lege and acted as a waiter in a college commons. The report of the 

 meals taken previous to each experiment showed that he was living 

 very frugally. 



The variations in the respiratory quotient from period to period are, 

 on the whole, not excessive. While there were some discrepancies, 

 these might be expected with so large a number of determinations, 



