90 COMPARISONS OF RESPIRATORY EXCHANGE. 



period, 1 hour 25 minutes. Pneumatic nosepieces used in periods with tension- 

 equalizer unit. Subject fairly quiet in calorimeter, except for a part of the last 

 period; quiet with tension-equalizer unit. Pulse-rate fairly uniform in calori- 

 meter and also for the most part with the tension-equalizer unit. Respiration 

 records not made in calorimeter; rate uniform with tension-equalizer unit. 



S. A. R., April 2, 1912. — Bed calorimeter, three 45-minute periods; tension- 

 equalizer unit, four 14-minute periods; preliminary period approximately 

 1 hour 15 minutes. In calorimeter subject breathed through nosepieces and 

 the three-way valve, which had been detached from the respiration apparatus 

 and placed in the calorimeter chamber. The openings of the valve had been 

 adjusted in such a way that the changes in resistance were the same as when 

 he breathed through it on the tension-equalizer unit; he also lay on his back 

 as in experiments with the tension-equalizer unit. Pneumatic nosepieces 

 were used in the tension-equalizer unit periods. When taken out of calorim- 

 eter subject said he was somewhat tired. Was quiet in the tension-equalizer 

 periods. Pulse-rate uniform throughout whole experiment, especially with 

 bed calorimeter. No respiration records obtained with calorimeter; with 

 tension-equalizer unit respiration-rate uniform. 



S. A. R., April 5, 1912. — Tension-equalizer unit, three 13- to 15-minute 

 periods; bed calorimeter, three 45-minute periods. Pneumatic nosepieces 

 used with tension-equalizer unit. Nosepieces and three-way valve used in 

 calorimeter as in the preceding experiment; surgeon's plaster was also used 

 over the lips so that subject could not breathe through mouth. Subject sleepy 

 during periods with tension-equalizer unit, particularly in the first period. 

 Stated at end of calorimeter periods that the inability to change his position 

 due to the use of nosepieces and three-way valve was tiring, also that the 

 nosepieces were somewhat too closely fitted. He slept part of the time in 

 calorimeter. Pulse-rate uniform with tension-equalizer unit except in first 

 period; with calorimeter but few records of pulse-rate obtained, but these were 

 fairly uniform. Respiration-rate with tension-equalizer unit uniform; no 

 records taken with calorimeter. 



P. F. J., March 15, 1912. — Bed calorimeter, three 45-minute periods; 

 tension-equalizer unit, four 15-minute periods; preliminary period, 48 minutes. 

 Pneumatic nosepieces used with tension-equalizer unit. Subject quiet and 

 awake in calorimeter. Pulse-rate fairly uniform throughout experiment. No 

 respiration records with calorimeter; with tension-equalizer unit fairly uniform. 



P. F. J., March 18, 1912. — Bed calorimeter, three 45-minute periods; tension- 

 equalizer unit, four 15-minute periods; preliminary period, approximately 1 

 hour 38 minutes. Pneumatic nosepieces used with tension-equalizer unit. 

 Subject quiet and awake throughout the experiment. Pulse-rate uniform. 

 Respiration-rate also uniform in tension-equalizer unit periods, but no records 

 taken in calorimeter periods. 



P. F. J., March 29, 1912. — Tension-equalizer unit, four 15-minute periods; 

 bed calorimeter, three 45-minute periods. Subject quiet with the tension- 

 equalizer unit; complained of acid fumes in one period, but said that in the 

 third period he could tell no difference between breathing room air and the 

 air in the apparatus. In the calorimeter periods he was more restless. The 

 pulse-rate with the tension-equalizer unit was uniform, but was somewhat 

 more variable in the calorimeter periods. Respiration-rate with respiration 

 apparatus uniform; no records obtained with the calorimeter. 



P. F. J., April 8, 1912. — Bed calorimeter, two 1-hour periods; tension- 

 equalizer unit, three 12- to 14-minute periods; preliminary period, 55 minutes. 

 Subject fairly quiet in calorimeter; uneasy and restless in last two periods with 

 tension-equalizer unit, and said he had great difficulty to keep from coughing. 



