648 Experiments 



At 738 mm. (deduction of the water vapor tension), the blood 



CO 



contains: Oxygen 25.6; CO, 23.0; N 2.6. = 0.89. 



O 



CO 



At 318 mm.: 2 23.7; C0 2 18.9; N 1.8. = 0.79. 



O 



CO 



At 128 mm.: O. 23.0; C0 2 16.2; N 0.5. = 0.70. 



O 



CO 



At 78 mm.: 2 23.0; CO* 13.7; N 0.5. = 0.59. 



O* 



co 2 



At 38 mm.: O, 19.3; CO, 10.8; N 0.3. = 0.55. 



o 2 



The accompanying graph (Fig. 43, A) summarizes and ex- 

 presses the average of the results of the preceding experiments, in 



Fig. 43— Capacity of the blood for absorbing oxygen at pressures below 

 one atmosphere. A. Laboratory temperature. B. Body tempera- 

 ture. C. Living animals. 



