136 



COMPARISONS OF RESPIRATORY EXCHANGE. 



DISCUSSION OF RESULTS. 



The results of the experiments are given in table 19, with an average 

 for each apparatus for every experiment and a general average for each 

 apparatus for the whole series of comparisons. The greatest average 

 difference in the respiratory exchange with the two methods is shown in 

 the results for the carbon-dioxide elimination, that with the Zuntz- 

 Geppert apparatus being 176 c.c. and for the spirometer unit 182 c.c. 

 The average oxygen consumption with the two apparatus is nearly 

 identical, *. c, 220 c.c. for the Zuntz-Geppert apparatus and 219 c.c. for 

 the spirometer unit; the respiratory quotient is 0.80 for the Zuntz- 

 Geppert apparatus and 0.83 for the spirometer unit. The average 

 pulse-rate is 58.5 for both apparatus. There is only a slight difference 

 in the average respiration-rate, which is 12.3 for the Zuntz-Geppert 

 apparatus as compared with 12.5 for the spirometer unit. The average 

 ventilation per minute and volume per respiration are slightly lower with 

 the Zuntz-Geppert apparatus (4.45 liters and 448 c.c, respectively) than 

 with the spirometer unit (4.76 liters and 480 c.c, respectively). 



Table 19. — Respiratory exchange in comparison experiments with the Zuntz-Geppert apparatus 

 and the Benedict respiration apparatus (spirometer unit). (Without food.) 



Subject, date, method, 

 and time. 



s ■»» 



.2 03 



-o a, 



03 & 



« • « 



o) "Z -S 



k_ *• S 



" ©'a 



X m a 



o 



I a 

 IS' 



Composition of 

 expired air. 



Carbon 

 dioxide. 



Oxygen 



H. F. T. 

 Jan. 18, 1912: 



Spirometer unit : 

 6 h 38 m a. m 

 7 02 a. m 



7 28 a. m 



8 40 a. m 

 Average 



Zuntz-Geppert: 

 7 h 56™ a. m 

 8 20 a. m 

 Average 



Jan. 19, 1912: 



Spirometer unit: 

 6 h 19™ a. m 



7 14 a. m 



8 06 a. m 

 8 51 a. m 



Average 



Zuntz-Geppert: 

 6 h 50™ a. m 



7 40 a. m 



8 31 a. m 

 Average 



Jan. 27, 1912: 



Spirometer unit: 

 6 h 32 m a. m 



6 54 a. m 



7 16 a. m 

 7 35 a. m 



Average 



c.c. 

 166 

 188 

 177 

 172 

 176 



152 

 171 



195 

 157 

 184 

 166 

 1 76 



134 

 147 

 158 

 146 



185 

 155 

 159 

 171 



168 



c.c 

 195 

 185 

 191 

 212 

 196 



189 

 199 

 194 



213 

 189 

 198 

 202 



201 



182 

 195 

 223 



213 

 198 

 198 

 212 



205 



9.5 

 10.4 



9.0 

 10.4 



9.8 



11.4 

 10.4 

 10.9 



9.1 

 9.3 

 9.9 

 11.1 

 9.9 



liters. 

 4.23 

 5.19 

 4.40 

 4.97 

 4.70 



4.20 

 4.57 

 4.39 



4.76 

 4.42 

 5.07 



5.28 

 4.88 



8.4 | 3.64 

 10.4 i 4.14 

 11.2 j 4.83 

 10.0 4-20 



11.2 



9.9 



9.8 



10.6 



10.4 



5.18 

 4.15 

 4.32 

 4.64 

 4-57 



c.c. 

 534 

 599 



587 

 573 

 573 



433 

 517 



475 



638 

 580 

 627 

 582 

 607 



520 

 483 

 516 



506" 



563 

 510 

 537 

 533 

 536 



p. ct. 



p. ct. 



3.71 

 3.83 



3.77 



16.55 

 16.65 

 16.60 



3.83 

 3.70 

 3.42 



3.65 



16.11 

 16.36 

 16.50 

 16.32 



