MOUTH- AND NOSE-BREATHING, BENEDICT APPARATUS. 181 



DISCUSSION OF RESULTS. 



The results of this series of comparisons are given in table 29, in 

 which the general averages show that the respiratory exchange with 

 the two methods of breathing was nearly the same. The difference 

 for the average carbon-dioxide elimination with the mouthpiece and 

 the nosepieces was 5 c.c. and for the oxygen consumption 5 c.c. The 

 respiratory quotient was practically identical for the two types of 

 breathing. The pulse-rate, respiration-rate, total ventilation of the 

 lungs, and volume of respiration may likewise be said to be the same 

 for both methods, the slight difference being within the limits of error 

 of measurement. 



Table 29. — Respiratory exchange in comparison experiments with mouth-breathing and nose- 

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



Subject had breakfast about 7 h 30 m a. m. 



