368 



RESPIRATION 



DOUGLAS 



40 

 36 

 32 



28 

 24 



II 

 JULY 



HA LOAN E 



4 & 12 16 20 24 28 / 59 

 AUGUST SEPTEMBER. 



Figure 97. 



Pressure of COz and oxygen in alveolar air of three members of the Pike's 

 Peak Expedition at about sea level (Oxford and New Haven), at Colorado 

 Springs (6,000 feet), and on Pike's Peak (14,100 feet). Thick line = alveolar 

 COz pressure, and thin line = alveolar oxygen pressure. Interrupted lines = 

 normal alveolar COz and oxygen pressures at sea level. 



