ON THE EFFECT OF CLIMATE UPON HEALTH ANT) DISEASE. 291 



blood can be calculated from that in the alveolar air by subtracting 

 1 mm. for every 100 c.c. of oxygen absorbed by the lung per minute. 



Figure showing dissociation curves of B and D at the C0 2 tension of their 

 alveolar air at different altitudes. 

 Percentage 

 saturation of 

 blood with oxygen. 



100 



90 



80 



70 



60 



50 



40 



30 



20 



10 







10 20 30 40 50 60 



O) pressure in m.m. of Hg. 



The following table will therefore give the oxygen tension in D's 

 and B's blood under varying circumstances of oxygen intake: — 



