BENEDICT APPARATUS, INCREASED DEAD SPACE. 



209 



J. W. P., October 22, 1912. Without dead space, 3 periods; with dead space, 

 3 periods; first, second, and fourth periods without dead space, remaining 

 periods with dead space. Some difficulty was experienced in fitting the 

 nosepieces closely to the nostrils of this subject; he was also somewhat active 

 in second period with increased dead space. Pulse-rate fairly regular through- 

 out experiment. Respiration irregular at times as to depth, although rate 

 was regular; a portion of the respiration record for the second period with the 

 dead space is given in figure 63. Average barometric pressure, 768.1 mm.; 

 average temperature of air in apparatus, 19.8 C. 



FIG. 63. Type of respiration of subject J. W. P. in the second period with additional 

 dead space on October 22, 1912. Original size. 



STATISTICS OF EXPERIMENTS WITH AN INCREASE IN DEAD SPACE OF 90IC.C. 



J. K. M., September 21, 1912. Without dead space, 4 periods; with dead 

 space, 3 periods; first two periods without dead space, thereafter alternating. 

 Subject stated that he noted no difference in respiration with additional dead 

 space; preferred pneumatic to glass nosepieces. Pulse-rate somewhat irregular 

 in all periods, with wide variations in range. Respiration-rate regular in all 

 periods, character being more regular in periods with dead space thanfin 

 periods with normal dead space. Sections of the respiration record with each 



FIG. 64. Type of respiration of subject J. K. M. with 90 c.c. additional dead space on 

 September 21, 1912. Original size. 



