132 



COMPARISONS OF RESPIRATORY EXCHANGE. 



side during whole experiment; stated that in second period with spirometer 

 unit he was quite drowsy. Pulse-rate uniform in all experiments. Respira- 

 tion-rate with spirometer unit very uniform in first period, but in the last two- 

 thirds of second period and in third period somewhat irregular. With 

 Zuntz-Geppert apparatus, respiration-rate in practically all three periods very 

 uniform. Sections of curves obtained with the spirometer unit are given in 

 figure 40. Average barometric pressure, 753.3 mm. ; average temperature of 

 the air in the spirometer unit, 21.0° C; in the Zuntz-Geppert apparatus, 

 18.4° C. 



K. H. A., February 2, 1912. — Spirometer unit, 4 periods; Zuntz-Geppert 

 apparatus, 2 periods; periods with each apparatus in series. Pneumatic nose- 

 pieces with spirometer unit, mouthpiece with Zuntz-Geppert apparatus. 

 Pulse-rate fairly uniform in most of the periods. Respiration-rate regular in 

 all periods; in third period with spirometer unit there was a tendency for the 

 depth of expiration to vary. Average barometric pressure, 750.4 mm.; 

 average temperature of air with spirometer unit, 23.0° C. ; with Zuntz-Geppert 

 apparatus, 20.6° C. 



K. H. A., February 19, 1912. — Spirometer unit, 5 periods; Zuntz-Geppert 

 apparatus, 2 periods; periods with each apparatus in series. In second period 

 subject opened his mouth twice, allowing air to 

 escape; data for oxygen consumption not given in 

 table, therefore, although the figures for carbon- 

 dioxide elimination are given. In third, fourth, and 

 fifth periods, respiration regular in rate and fairly 

 regular in amount. In fourth period, tendency 

 shown for air in respiratory tract at end of respira- 

 tion to be irregular. Subject said that in this period 

 the nosepieces had been inserted too deeply, which 

 interfered somewhat with breathing. Average baro- 

 metric pressure, 760.8 mm. ; average temperature of 

 air in spirometer unit, 21.6° C.; in Zuntz-Geppert apparatus, 15.6° C. The 

 preliminary ventilation by minutes preceding the two periods with the Zuntz- 

 Geppert apparatus is shown herewith. 



H. H.A., February 8, 1912. — Zuntz-Geppert apparatus, 2 periods; spirometer 

 unit, 3 periods; periods with each apparatus in series. Subject drowsy at 

 times. Pulse-rate for the most part regular in individual periods. Respira- 

 tion-rate regular in all periods. Average barometric pressure, 754.3 mm.; 

 average temperature of air in spirometer unit, 20.1° C.J in Zuntz-Geppert 

 apparatus, 18.8° C. 



H. H. A., February 6, 1912. — Spirometer unit, 4 periods; Zuntz-Geppert 

 apparatus, 3 periods; periods with each apparatus in series. Pulse-rate in indi- 

 vidual periods for the most part uniform. Respiration-rate in all periods 

 uniform. Average barometric pressure, 757.3 mm.; average temperature 

 of air in spirometer unit, 20.9° C.; in Zuntz-Geppert apparatus, 18.7° C. 



H. H. A., February 8, 1912. — Zuntz-Geppert apparatus, 3 periods; spi- 

 rometer unit, 2 periods; periods with each apparatus in series. Nosepieces 

 with Zuntz-Geppert apparatus, mouthpiece with spirometer unit. Subject 

 said in general he preferred the mouthpiece, but when used with the spirometer 

 unit there was a tendency for the mouth to become dry. His preference was 

 therefore to use the nosepieces for the spirometer unit and the mouthpiece 

 with the Zuntz-Geppert apparatus instead of the reverse, as in the experiment. 

 Both pulse-rate and respiration-rate uniform in all of the periods. Average 

 barometric pressure, 754.0 mm.; average temperature of air in spirometer 

 unit, 19.0° C. ; in Zuntz-Geppert apparatus, 17.3° C. 



