212 



COMPARISONS OF RESPIRATORY EXCHANGE. 



Subject drowsy in second and sixth periods; said he had some difficulty in 

 breathing in first, fourth, and fifth periods, but in the others none at all. 

 Was somewhat nervous, as he had not slept well the previous night. Pulse- 

 rate uniform, except in fourth period, when the range was from 71 to 79* 

 Respiration in first period uniform, in second period uniform at first but later 

 became more shallow; third period, uniform; fourth period, shallow in the 

 middle of period; fifth period, uniform; sixth period, shallow at first, but deeper 



FIG. 69. Type of respiration of subject P. F. J. with 135 c.c. additional dead space on November 

 7, 1912. Upper curve, pneumograph record; lower curve, spirometer record. Original size. 



the last two-thirds of the period. Sections of the respiration curves obtained 

 with the two methods are given in figures 68 and 69. Average barometric 

 pressure, 758.3 mm.; average temperature of air in apparatus, 18.3 C. 



P. F. /., November 14, 1912. Without dead space, 4 periods; with dead 

 space, 4 periods; periods with and without additional dead space alternating. 

 Subject stated that a desire to urinate during the last two or three periods 



FIG. 70. Type of respiration of subject J. B. T. with 224 c.c. additional dead space on 

 December 7, 1912. Original size. 



