252 Miss M. P. FitzGerald. Further Observations on the 



showing the values for the barometric pressure when the mean temperature 

 of the air column between sea-level and the heights indicated is assumed to 

 be 15° C. 



For the calculated values and graphic representation of the percentage 



Cos pressure Altitude 



mm.of 800 750 700 650 600 650 600 460 400 360 300 250 200 

 mercury 



800 750 



700 660 600 550 600 •♦50 400 350 300 250 

 Alnvosphertc pressure in mm. of mercury. 



Chart I . 



200 



composition of the alveolar gases at atmospheric pressures ranging from 

 760 to 250 mm. of mercury the reader is referred to the earlier paper.* 



The idea was put forward in that paperf that at atmospheric pressures 

 greater than 625 mm. of mercury the straight line representing the C0 2 

 tension might perhaps be replaced by a curve, and that this would flatten as 



* Ibid., pp. 359-360. 

 t Ibid., p. 360. 



