64 



Chapter V 



different individuals of the human race. Probably my own blood 

 has been studied in greater detail than that of any person except 

 Douglas. It is quite certain that my blood differs from his. It is 

 also certain that with a slightly different value for K a curve for my 



100 



90 



80 



70 



60 



50 



40 



30 



20 



10 



1 



20 



30 



40 



50 



60 



70 



80 



90 



100 



90 



80 



70 



60 



50 



40 



30 



20 



10 



10 20 30 40 50 60 70 80 90 



FIG. 33. Douglas' blood and Barcroft's blood exposed to 40 mm. C0 2 pressure. Points 



Kx n 

 actually determined. Curves drawn from formula ?//100= n . Ordinate = 



percentage saturation. Abscissa = oxygen pressure in mm. 



blood can be calculated from Hill's equation, which fits the points 

 which have been determined (Fig. 33). 



The normal dissociation curves for Douglas' blood and of my 

 own have been determined in the presence of CO 2 as I have said 



