BED CALORIMETER AND TENSION-EQUALIZER UNIT. 89 



Subject quiet. Pulse-rate uniform throughout experiment, especially in first 

 two series. During the first series with the bed calorimeter the records 

 obtained with the chest pneumograph showed the respiration to be decidedly 

 irregular, but no quantitative determinations could be secured. In the period 

 beginning at 10 h 19 m a. m., there was considerable apncea, approaching 

 Cheyne-Stokes respiration. During the second period in this series the respi- 

 ration was much more uniform in character. In the other periods of the exper- 

 iment the respiration-rate was uniform with both apparatus. Figure 36 

 gives curve obtained for the respiration of this subject. 



FIG. 36. Type of respiration of subject H. F. T. in the first period with the bed calori- 

 meter on August 31, 1911. Note the frequency of apnoea. 



Dr. P. R., October 24, 1911. Bed calorimeter, three 45-minute periods; 

 tension-equalizer unit, four 15-minute periods; preliminary period, 1 hour 3 

 minutes. Pneumatic nosepieces with tension-equalizer unit. Subject very 

 quiet throughout experiment; slept part of time in bed calorimeter. Pulse- 

 and respiration-rates uniform. 



K. H. A., February 26, 1912. Bed calorimeter, four 45-minute periods; 

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

 5 minutes. Pneumatic nosepieces used with tension-equalizer unit. Subject 

 quiet, though awake, in calorimeter; with tension-equalizer unit, slight move- 

 ment in first period and drowsy in third period. Pulse-rate uniform through- 

 out experiment. No respiration records in calorimeter periods ; with tension- 

 equalizer unit, respiration-rate uniform. 



K. H. A., March 14, 1912. Bed calorimeter, four 45-minute periods; 

 tension-equalizer unit, four 15-minute periods; preliminary period, 50 minutes. 

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

 awake throughout experiment. Pulse-rate uniform. No records of respiration 

 in bed calorimeter periods, but those for the tension-equalizer unit were uniform. 



/. A. F., March 19, 1912. Bed calorimeter, three 45-minute periods; 

 tension-equalizer apparatus, three 12- to 15-minute periods; preliminary 

 period, 1 hour 9 minutes. Subject quiet for the most part in calorimeter 

 except for slight movement after beginning of each period; more active in 

 first period than in last two periods. With tension-equalizer unit, subject 

 quiet and awake. Pulse-rate uniform throughout experiment. No respira- 

 tion records taken in calorimeter periods; respiration-rate uniform in periods 

 with tension-equalizer unit. 



S. A. R., March 16, 1 91 2. Subject had very light breakfast at 8 h 30 m a. m.; 

 experiment began at l h 25 m p. m. Bed calorimeter, three 45-minute periods; 

 tension-equalizer unit, three 15-minute periods; preliminary period, 45 minutes. 

 Results of two additional periods with tension-equalizer unit not included in 

 table, as subject was disturbed, causing leakage of air. Subject quiet through- 

 out experiment. Pulse-rate fairly uniform in calorimeter and uniform with 

 tension-equalizer unit. No respiration records made with calorimeter; rate 

 uniform with tension-equalizer unit. 



S. A. R., March 20, 1912. Subject had very light breakfast early in the 

 morning; experiment began at 2 h 19 m p. m. Bed calorimeter, two 1-hour 

 periods; tension-equalizer unit, four 11- to 15-minute periods; preliminary 



