176 



Chapter XI 



the two phases of respiration are almost like an object and its image. 

 These curves are shown in Fig. 93 c. 



10 2Q 32 _ o - so - 60 



so - go - TOO Oxidation 



17-5 C. no CO, 



Eeduction 



100 



80 



60 



40 



20 



w 



Oxidation 



37-5 C. no C0 2 



Reduction 



100 



80 



60 



40 



20 



7 



\ 



\ 



Oxidation 



37-5 C. 



+ 40 mm. pressure 

 of CO., 



Reduction 



FIG. 93. Relative rates of oxidation and reduction of blood. Ordiuate = percentage 

 saturation. Abscissa = time in minutes. A, temp. 17'5 C., reducing gas hydrogen, 

 oxidising gas hydrogen + 100 mm. oxygen. B, temp. 37'5 C., gases as in A. 

 C, 37'5 C., reducing gas hydrogen + 40 mm. C0 2 . Oxidising gas hydrogen + 100 mm. 

 oxygen + 40 mm. CO.,. 



The contemplation of this figure gave me a great deal of enjoy- 

 ment till it occurred to me that the process of respiration only 

 involved the upper portion of the curve in each case. Now the 



