Changes in Breathing and Blood at High Altitudes. 253 



a pressure of 760 mm. of mercury was approached, and continue as a straight 

 line parallel to the abscissae with increased pressure. If such alteration 

 occurs, it is evident that it can only be at pressures higher than 760 mm. of 

 mercury. From the earlier experiments of Haldane and Priestley * Hill and 



Haemoglobin 



8O0 



180 



350 



J70 



60 



50 







1 



1 





i 



i 





1 





1 J 























/ 





































































































o 



\ • ■ 





jr 











• 





• 







p 













o 



^ o 



























/# 



£- 





















/i 

 i£ 





















// 



? 

















1 / 



1 . 









i 



1 



1 - 







300 IHft. 

 2&0OO 



700 650 600 550 500 450 400 350 

 Atmospheric pressure in mm of mercury. 



Chart II. 



25000 

 2 4000 

 23,000 

 22.000 

 21,000 

 20.000 

 10.000 

 18.000 

 17000 

 16.000 

 15.000 

 14.000 



- 13.000 

 12.000 

 11.000 

 10,000 



9,000 

 8.000 

 7.000 

 6,000 

 5.000 

 4,000 

 3,000 

 2.000 



- 1O00 

 



300 



Greenwood.f and Haldane and Boycott,! we know that on short exposure to* 

 increased pressure the alveolar C0 2 remained at normal value, even up to 



* ' Journ. Physiol vol. 32, p. 225 (1905). 

 t ' Roy. Soc. Proc.,' vol. 70, p. 455 (1906). 

 | ' Journ. Physiol.,' vol. 37, Nos. 5-6, p. 355 (1908). 

 VOL. LXXXVIII. — B. U 



