Gases of the Blood 639 



in spite of the decrease in the proportion of 2 in the blood, and we 

 understand that the animal finds no serious trouble in its different 

 functions: respiration, circulation, etc., as the detailed report of 

 the experiment shows. 



But we continue the decompression; the pressure now is only 

 17 cm., and in the arterial blood there are only 8.8 volumes of oxy- 





Fig. 40— Decrease of the gases of the arterial blood and the venous blood 

 when the tension of the oxygen breathed decreases; the lower 

 group corresponds to the oxygen of the blood, the upper to the 

 carbonic acid. 



