THE OXYGEN IN BLOOD 



529 



The above figures show clearly the difference in the amounts 

 of oxygen in simple solution and in chemical combination under 

 varying pressures of oxygen ; thus a rise of pressure from 70 to 

 150 mm. increases the former by over 100 per cent., the latter 



10 10 30 40 so so TO so do ioo no no 130 no 150 

 FIG. 29. Curve of the Partial Pressure of Oxygen in Horse's Blood at 38 (Bohr}. 



by less than 2 per cent. ; in other words, chemical combination is 

 by far the most effective method of absorption at low pressures. 



The preceding figure is a graphic representation of the above 

 results ; the abscissa stands for the pressure and the ordinates for 

 the quantities of gas absorbed ; the curve represents the gas in 

 chemical combination, the dotted line the oxygen in simple solu- 

 tion in the plasma. 



2 L 



