150 



COMPARISONS OF RESPIRATORY EXCHANGE. 



The variations in the averages for both apparatus in each experi- 

 ment are given in table 22, the values for the tension-equalizer unit 

 being used for the base-line. These variations ranged for the carbon- 

 dioxide elimination from +14 to — 14, with an average of =±=6; for the 

 oxygen consumption from +16 to —11, with an average of =±=5; for 

 the respiratory quotient from +0.06 to —0.06, with an average of 

 =*= 0.035. The average pulse-rate and respiration-rate do not show 

 much variation. 



The data for the probability curves have also been calculated, and 

 the curves are given in figure 43. The uniformity for all of the factors 

 measured is practically the same with both types of apparatus. As has 

 been stated, all of the comparisons but one were made with the same 



Table 22. — Variations of average results obtained with the Tissot apparatus from those obtained 



ivith the tension-equalizer unit. 



subject. The results obtained with this subject are more likely to be 

 variable than with many other subjects because of frequent apncea, 

 but a study of the variations will show that these are as likely to be in 

 one direction as in the other, while the average difference is small. In 

 the experiment which contained the greatest number of periods — that 

 on September 13 — the averages are almost identical. The results as a 

 whole indicate that the respiratory exchange as measured by the Tissot 

 apparatus and the tension-equalizer unit is essentially the same. 



TISSOT APPARATUS AND BENEDICT RESPIRATION APPARATUS 

 (SPIROMETER UNIT). 



The second series of experiments comparing the respiratory exchange 

 as measured by the Benedict respiration apparatus and the Tissot 

 apparatus was made with the spirometer unit, the pneumatic nose- 

 pieces being used unless otherwise stated. With the Tissot apparatus, 

 the 200-liter spirometer was used and also the glass nosepieces, except 

 as noted in the statistics. The samples of air for the Tissot apparatus 



