368 



RESPIRATION 



DOUGLAS 



40 

 36 

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28 

 24 



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no 



100 

 90 

 80 

 70 

 60 



50 



7 // 15 J9 23 21 31 

 JULY 



4 a 12 

 AUGUST 



16 20 24 26 / 5 9 

 SEPTEMBER 



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HALDANE 



HENDERSON 



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Figure 97. 

 Pressure of CO2 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 

 CO3 pressure, and thin line = alveolar oxygen pressure. Interrupted lines = 

 normal alveolar CO2 and oxygen pressures at sea level. 



