ZUNTZ-GEPPERT AND BENEDICT METHODS. 



123 



uniform. Respiration-rate obtained with pneumograph; rate remarkably 

 uniform in all periods. Rate of preliminary ventilation for 20 liters with 

 Zuntz-Geppert apparatus : 



D. J. M., July 1,1910. — Tension-equalizer unit, 3 periods; Zuntz-Geppert 

 apparatus, 3 periods; preliminary period, 15 minutes; apparatus alternated. 

 Mouthpiece used with tension-equalizer unit, as subject said nosepieces irri- 

 tated his nose. Subject more or less restless during experiment, as flies 

 troubled him somewhat; also moved lower part of body; was asleep during 

 second period with each apparatus. Pulse-rate counted three times in every 

 period. Respiration-rate obtained with pneumograph, but little could be 

 determined as to character, as apparatus was not well placed; rate in individual 

 periods fairly uniform. Rate of preliminary ventilation for 20 liters with 

 Zuntz-Geppert apparatus: 



DISCUSSION OF RESULTS. 



The data for the individual periods and the averages for each appa- 

 ratus, both for each experiment and for all the periods in the series, 

 are given in table 17. The grand averages for the carbon-dioxide 

 elimination for the two apparatus show a difference of only 4 c.c. per 

 minute, being 190 c.c. for the tension-equalizer unit and 186 c.c. per 

 minute for the Zuntz-Geppert apparatus. The averages for the oxygen 

 consumption differ only 3 c.c, these being 224 c.c. per minute and 

 227 c.c. per minute respectively. The average respiratory quotients, 

 pulse-rate, and respiration-rate show a similar good agreement. The 

 values for the tension-equalizer unit are: Respiratory quotient, 0.850; 

 pulse-rate, 63.0; respiration-rate 15.9; for the Zuntz-Geppert appa- 

 ratus, respiratory quotient, 0.820; pulse-rate 64.5; respiration-rate 17.0. 



