RESPIRATION 



371 



lower altitudes in South Carolina. 10 The average results are 

 shown in Figure 98. The results for men and women are given 

 separately, as men have a higher average alveolar CO 2 pressure 

 than women, as mentioned in Chapter II. It will be seen that 

 within the limits of atmospheric pressure investigated, the aver- 



Cas pressure Altitude 



mm. of 800 75O 70O 65O 60O 550 SOO 45O 4QO 350 ZOO 2 SO 20O >n Ft 



3OO ISO 700 650 600 S5O 5OO 4SO 4OO 3SO SOO 2SO 20O 

 Atmospheric pressure in mm. of mercury. 



Figure 98. 

 Alveolar gas pressures in relation to barometric pressure or altitude. 



age alveolar CO 2 and oxygen pressures fall proportionally to 

 the atmospheric pressure. To judge from these results the al- 

 veolar oxygen pressure at the height of 24,600 feet reached by the 



10 FitzGerald, Phil. Trans. Roy. Soc., B, 203, p. 351 ', and Proc. Roy. Soc., B, 

 88, p. 248. 



