112 COMPARISONS OF RESPIRATORY EXCHANGE. 



STATISTICS OF EXPERIMENTS. 



H. B. L., March 5, 1912. — Tension-equalizer unit, 4 periods; spirometer 

 unit, 4 periods; the two forms of apparatus alternated. Subject frequently 

 complained that he was getting tired and said that while he noticed no par- 

 ticular difference between the two types of apparatus, he found it somewhat 

 difficult to remain quiet during the whole experiment. Respiration-rate 

 fairly regular. 



S. A. R., March 23, 1912— A light breakfast; experiment began l h 40 m 

 p. m. Tension-equalizer unit, 5 periods; spirometer unit, 2 periods; first 3 

 periods with tension-equalizer unit, then apparatus alternated for 4 periods. 

 In the first and second periods the subject complained that the air supplied 

 seemed somewhat dry; water was added to the moistener 1 after the second 

 period; the subject then stated that he found breathing much easier. Pulse- 

 rate fairly uniform. Respiration-rate for the most part uniform, but character 

 varied slightly at times. In last period of experiment (with tension-equalizer 

 unit), the depth of respiration varied somewhat, being wave-like and approx- 

 imating Cheyne-Stokes respiration, but the pneumograph gave no idea of the 

 quantitative variations. 



S. A. R., April 1, 1912. — Tension-equalizer unit, 5 periods; spirometer unit, 

 4 periods; first two periods with tension-equalizer unit in series, then apparatus 

 alternated. Respiration regular in rate and depth. 



J. A. F., March 26, 1912. — Spirometer unit, 3 periods; tension-equalizer 

 unit, 3 periods; apparatus alternated throughout experiment. Subject not 

 mcuh accustomed to apparatus, as he had been experimented upon but once 

 before. Pulse-rate uniform in the individual periods. Respiration regular 

 throughout experiment. 



K. H. A., May 21, 1912. — Spirometer unit, 3 periods; tension-equalizer unit, 

 3 periods; apparatus alternating throughout experiment. Subject stated that 

 he noted no difference between the two apparatus. He also said that at the 

 beginning of the first period with each apparatus he noticed a slight odor, 

 but that this soon passed away. Pulse-rate in individual periods uniform. 

 Respiration uniform in character and depth, except that in the second period 

 with the spirometer unit there was a tendency to irregularity in depth. 



K. H. A., May 25, 1912. — Spirometer unit, 3 periods; tension-equalizer 

 unit, 3 periods; apparatus alternating throughout experiment; preliminary 

 period, 39 minutes. Subject stated that the nosepieces in the first period 

 were inflated too much and therefore fitted too closely. Pulse-rate in indi- 

 vidual periods uniform; respiration exceptionally uniform throughout the 

 experiment. 



J.B.T., May 27, 1912. — Spirometer unit, 2 periods; tension-equalizer unit, 

 3 periods; first and fourth periods, spirometer unit; remaining periods, tension- 

 equalizer unit. Pulse-rate uniform in individual periods; respiration uniform 

 in rate and depth. 



J. B. T., May 29, 1912. — Spirometer unit, 2 periods; tension-equalizer unit, 

 3 periods; first and second periods with spirometer unit; remaining periods 

 with tension-equalizer unit. In the fourth period (tension-equalizer unit) 

 the barium-hydroxide test 2 showed that the carbon dioxide had not been 

 wholly absorbed from the air and the results obtained for the carbon-dioxide 

 production are therefore in error. In the last period (same apparatus) the 

 valve was not turned soon enough at the beginning of the period and the 

 result for the oxygen consumption is therefore too low. The respiration 

 in the entire experiment was very uniform in character. 



iSee fig. 7. p. 29. 2 See p. 32. 



