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. 



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. 



