DOUGLAS AND BENEDICT METHODS. 



167 



for the oxygen consumption, and 0.795 for the respiratory quotient 

 as compared with 189 c.c, 231 c.c. and 0.820 respectively for the 

 same factors with the spirometer unit. The average pulse-rate for 

 the two methods is essentially identical, i. e., 62 per minute for the 

 Douglas apparatus and 61.5 for the spirometer unit. The other 

 averages show slight variations, the values being for the Douglas 

 apparatus 15.3 per minute for the respiration-rate, 5.15 liters for the 

 ventilation of the lungs, and 431 c.c. for the volume per respiration, and 

 for the spirometer unit, 14.3 per minute, 5.04 liters, and 445 c.c. respec- 

 tively for the same factors. The variations in the individual com- 

 parisons are given in table 26, the values for the spirometer unit being 

 used for the basis of calculation. A study of tables 25 and 26 shows 

 that the values fluctuate widely and that the differences between the 

 two apparatus are noticeable. 



Table 25. — Respiratory exchange in comparison experiments with the Douglas method and the 

 Benedict respiration apparatus (spirometer unit). (Without food.) 



