632 Experiments 



5:05; respirations, 24; pulse, 94; temperature 36.2°. Air, O 8.3; 

 CO* 2.5. Took blood, quite dark; O2 9.8; CO 40.2. 

 5:35; air, O2 6.2; CO* 1.7. 



5:50; respirations, 28; pulse, 148; temperature 34°. Very dark 

 blood, 25 cc, contains O 6.7; CO 37.9. 



5:58; Sudden violent struggling, after which the animal falls back, 

 as if conquered, and thenceforth remains quiet. 

 6:05; air, O2 4.0; CO 1.6. 



6:20; pulse, 68; pressure from 8 cm. to 17 cm.; feet sensitive. 

 6:30; respirations, 16; pulse, 68; temperature 34°. 

 6:35; air, O 3.0; CO 0.8. 



6:40; took 25 cc. of blood, very dark, which contained: O 0.7; 

 CO 25.0. 



The respirations slacken when I begin to draw blood; they cease 

 at 6:45; I immediately draw blood which shows no trace of oxygen. 

 Summary: 



The air contains The blood contains 



Oxygen Oxygen CO2 



At the beginning 20.9 18.2 50.8 



After V 2 hour 17.9 



After 1 hour 16.3 16.6 47.7 



After IV2 hours 14.8 ■ 



After 2 hours 13.4 15.9 45.1 



After 2V 2 hours 10.4 



After 3 hours 8.3 . 9.8 40.2 



After 3V 2 hours 6.2 . 



After 3% hours 6.7 37.9 



After 4 hours 4 



After 4V2 hours 3 0.7 25 



The results of these two experiments are expressed on the fol- 

 lowing graph (Fig. 38), whose lines show the simultaneous vari- 

 ations of the oxygen of the air and the gases of the blood. The 

 solid line relates to Experiment CLXXXVIII; the dotted line to 

 Experiment CLXXXVII. 



Here now is an experiment in which from the very outset a dog 

 was made to breathe air low in oxygen: 



Experiment CLXXXIX. May 20. At 3:30, the animal breathing 

 ordinary air, 28 respirations, pulse 136; cardiac pressure, from 18 to 

 20 cm. 



Its blood contains: O2 21.5; CO2 47.3. 



4:30; the dog is made to breathe through the potash valves, from 

 a bag containing air with only 10 per cent of oxygen; it remains quiet. 



5 o'clock; respirations, 16; pulse, 128; pressure, 16 to 19 cm. 

 5:30; respirations, 16; pulse, 116. Dark blood, contains: O2 5.3; 



CO2 45.7. 



6 o'clock; respirations, 16; pulse, 80; pressure, from 8 to 13 cm. 

 6:30; respirations, 16; pulse, 56. 



6:45; respirations, 8; pulse, 24. 



