MOUTH- AND NOSE-BREATHING, TISSOT APPARATUS. 



187 



Table 31. — Respiratory exchange in comparison experiments with mouth-breathing and nose- 

 breathing — Tissot apparatus. (Without food.)— Continued. 



Subject, date, method, 

 and time. 



■2 °3 





c3 ft 





>> b-g 



X K C 



O 





« 



1.2 



Composition of 

 expired air. 



Carbon 

 dioxide. 



Oxygen 



K. H. A. — Continued. 

 June 22, 1912 — Continued. 

 Mouthpiece : 



9 h 17 m a. m 



10 12 a. m 



11 05 a. m 



Average 



Arithmetical average of all 

 experiments with nose- 

 pieces 



Arithmetical average of all 

 experiments with mouth- 

 piece 



c.c. 



215 



217 



208 



213 



c.c. 

 257 

 253 

 245 



.835 



.855 

 .850 

 .845 



55.0 

 56.0 

 52.0 



54.5 



14.0 

 13.8 

 13.8 

 13.9 



liters. 

 5.25 

 5.47 

 5.11 



6.28 



c.c. 

 451 



477 

 446 

 458 



p. ct. 

 4.11 

 3.99 

 4.09 

 4- 06 



p. ct. 

 16.22 

 16.45 

 16.31 

 16.33 



191 



197 



246 



247 



.775 



.800 



57.5 



58.0 



15.0 



14.2 



4.87 



4.68 



394 



403 



The differences found between the results for the mouth-breathing 

 and those for the nose-breathing for the individual experiments are 

 given in table 32, those for the nose-breathing being taken as the 

 base-line. It will be noted that in every instance the carbon-dioxide 

 elimination was higher with the mouth-breathing than with the nose- 

 breathing; the oxygen consumption was also higher in three of the 



Table 32. — Variations of average results obtained with mouth-breathing from those obtained 

 with nose-breathing (Tissot apparatus). 



five experiments, and both the respiratory quotient and pulse-rate 

 were higher in four of the five experiments. On the contrary, in four 

 of the five experiments both the respiration-rate and the ventilation 

 of the lungs were lower with the mouth-breathing, but the difference 

 was not large enough to be of significance. The results therefore 

 tend to show that with this apparatus there was a slightly higher respi- 

 ratory exchange with mouth-breathing than with nose-breathing. 



