724 Experiments 



Blood D (air, 27 min. after decompression) . contains, in 100 cc. 

 2 16.9; C0 2 21.0 



Blood E (air, 67 min. after decompression) . contains, in 100 cc. 

 O, 17.0; CO, 31.5 



The bag contained after the experiment a mixture of CO2 10.7 

 and 2 70 per cent. 



Therefore the oxygen pressure when blood B was drawn was 

 about 1.75 x 79 = 138, and when blood C was drawn, about 7 x 71 

 = 497. 



Experiment CCLXXXII. December 3. Dog. 



Tube in the trachea; rectal temperature 38°; respirations extraor- 

 dinarily rapid. 



3:20; blood drawn from the left carotid, 33 cc A 



The oxygen bag is attached to the cannula in the trachea; a flask 

 at the bottom of which there are a few bits of potash is placed where 

 the air will pass over it. 



3:30; drew 33 cc. of blood considerably redder; respiration has 

 become much slower B 



3:45; placed in the large compression apparatus. 



4 o'clock; pressure is 3% atmospheres; drew 33 cc. of very red 

 blood; no gas C 



A series of petty accidents occur; at 4:40, I wish to decompress 

 suddenly; but the rubber bag gets in front of the opening, and the 

 decompression is not finished until 5:45. 



The animal has neither convulsions nor quiverings; its tempera- 

 ture is 36°. 



Blood A (air, normal pressure) . . contains . . . 2 18.1; CO, 24.9 



Blood B (oxygen, normal pressure) contains . . . O2 20.9; CO, 33.7 



Blood C (oxygen, 3V 2 atmospheres) contains . . . 2 27.5; C0 2 56.5 



The air of the bag contained before the experiment 85 per cent of 

 oxygen; when blood C was drawn, the tension was about 80 x 3.5 

 = 280. 



Experiment CCLXXXIII. December 10. Vigorous dog, weighing 

 12.5 kilos. 



At 3:45, tube placed in the trachea; the respiration becomes 

 panting. 



3:55; drew 33 cc. of blood; the temperature is 38.5° A 



4:10; forced to breathe from the rubber bag containing oxygen. 



4: 18; drew 33 cc. of blood, redder B 



4:35; placed in the large apparatus with the rubber bag, in which 

 a potash wash has been placed. 



5:05; the pressure is 6 atmospheres; drew 38 cc. of blood. . . C 



5:35; the pressure is 9 atmospheres; drew 35 cc. of blood. . . D 



Some very small bubbles of gas appear. 



5:38; decompression in 3 or 4 minutes. 



When the animal is taken out, it is dead. The right auricle is still 

 beating. The venous blood is quite red, and when it is caught in a 

 glass, small bubbles of gas escape which come to the surface or re- 

 main clinging to the walls of the glass. Same phenomenon for the 



