160 



COMPARISONS OF RESPIRATORY EXCHANGE. 



experiment with this subject he was drowsy at times, this having an 

 influence on the uniformity of the results. The subject E. W. H. was 

 distinctly difficult to work with because of his restlessness; the high 

 values for the carbon dioxide and oxygen shown in the first experiment, 

 which tend to raise the general average value, were wholly due to this 

 fact. The subject J. H. H. gave on the average very fair values. It 

 may be noted in this connection that this subject earlier in the year 

 was used with the spirometer unit with very poor results. 



The average variations for all of the subjects were: Carbon-dioxide 

 production, ==9 c.c.; oxygen consumption, +9 c.c.; respiratory quo- 

 tient, ==0.035; ventilation of the lungs per minute, ==0.31 liter; volume 

 per respiration, == 78 c.c. It will be noted, however, that the volume 



TABLE 24. Variations of average results obtained with the Tissot apparatus from those obtained 

 vrith the spirometer unit. 



per respiration in all but two series is decidedly lower with the Tissot 

 apparatus than with the spirometer unit. This is due, in some cases at 

 least and particularly with J. H. H., to the fact that the respiration- 

 rate is higher with the Tissot apparatus and more nearly approaches 

 the normal. The fact that all the variations for the oxygen consump- 

 tion are plus indicates that the metabolism with the Tissot apparatus 

 was slightly higher than with the spirometer unit. 



The degree of uniformity in the results has been calculated and the 

 percentage of the total variation from the average is given in the form 

 of curves in figure 44. The several factors are comparatively uniform 



