Compressed Air; 2 Poisoning 725 



arterial blood, only the bubbles are much smaller. The muscles and 

 the motor nerves respond to electricity. 



When I drew blood D, the blood came with great difficulty into 

 the syringe in slow spurts. Probably the animal was dying at that 

 very moment; he had been observed to breathe up to that time; after- 

 wards, not. 



At 7 o'clock, no rigor mortis. 



Blood A (air, normal pressure) O. 19.8; C0 2 20.9; N 2.1 



Blood B (oxygen at 88%, normal pressure) . O. 20.9; CO, 34.5; N 1.5 



Blood C (oxygen, 6 atmospheres) 2 26.3; C0 2 63.5; N 3.9 



Blood D (oxygen, 9 atmospheres) 2 30.7; CO, 61.5; N 5.5 



The air of the bag, before the experiment, contained 88 per cent 

 of oxygen. So, taking account of the respiratory alteration, the oxygen 

 tension, when blood C was drawn, could be expressed by 80 x 6 

 = 480, and when blood D was drawn, by 78 x 9 = 702. 



Experiment CCLXXXIV. December 17. Young dog, weighing. 

 7.5 kilos. 



3:30; rectal temperature 39°. 



Tube placed in the trachea; respirations very rapid. 



3:40; drew 33 cc. of blood from the carotid, not very red. ... A 



3:42; forced to breathe from the oxygen bag, with a potash wash 

 in the bag. 



3:50; rectal temperature, 38.8°; drew 33 cc. of very red blood. B 



Placed in the compression apparatus at 4:05. 



4:50; 7 atmospheres; we try in vain to extract blood. 



Taken to 7 and % atmospheres, and decompressed suddenly. 



Withdrawn; temperature 37°. A few stiff enings and clonic con- 

 vulsions. The heart beats slowly, the blood is very dark. 



Dies at 5: 10, without a last sigh, with complete resolution. 



No urine in the bladder. But the kidneys, crushed with sulfate 

 of soda and animal charcoal, give a yellow precipitate with very 

 good Bareswill's reagent. The blood, treated in the same way, gives 

 a similar enormous precipitate; the potash browns the boiling liquid. 



Blood A (air, normal pressure) contains O* 12.1; C0 2 29.6 



Blood B (oxygen at 91%, normal pressure) contains 2 14.1; CO, 24.5 



The oxygen tension was about 7.75 x 80 = 620. 



Experiment CCLXXXV. December 20. Very vigorous dog, weigh- 

 ing 16.5 kilos. Rectal temperature 38.5°. 



3:55; drew 33 cc. of rather dark blood. Respirations a little 

 slow A 



4 o'clock; tube in the trachea; very much exaggerated respira- 

 tions for 4 to 5 minutes; then, period of calm, followed by other ex- 

 aggerated respirations. At 4: 10, while I am preparing to draw blood, 

 the respirations grow calm and return to normal type. At 4:12, drew 

 33 cc. of blood, less dark B 



4:30; placed in the compression apparatus, with rubber bag. 



5:05; pressure is 6 and % atmospheres; drew 40 cc. of very red 

 blood, from which very small bubbles of gas escape C 



5:12; decompressed suddenly. 



