876 Experiments 



I draw from its right heart 33.1 cc. of gas, which contains 17% 

 of CO,. 



Same results at autopsy as in the preceding experiment. 



Experiment DLXXI. July 10. Dog of Experiment DXXIX. 



From 2:40 to 3:40, taken to 10 atmospheres. As it approaches 10 

 atmospheres, has a sort of convulsion. 



Under pressure for 30 minutes. 



Decompressed from 10 to 6 atmospheres in 1 minute; then from 

 6 to 1 in 1 hour. Same convulsions during the decompression. 



As it leaves the apparatus, it cannot stand-up on its hind legs; 

 howls and whimpers; lies down on its side; trembling and strong 

 extension of its front feet at every inspiration. Hind legs flexed, 

 motionless, but sensitive. 



About 5:30 gets up, walks a little, slowly, then lies down again, 

 still weak in the hindquarters. 



July 11. Well. 



Experiment DLXXII. July 23. Dog of Experiment CLXXXII. 



At 5:08, dog taken to 10 atmospheres; at 5:15, dropped in 2 min- 

 utes to 6 atmospheres; at 5:45, dropped in 2 minutes to 3 atmos- 

 pheres; at 6:33, decompressed in less than 30 minutes. 



No immediate or delayed symptom. 



Experiment DLXXIII. July 27. Dog of Experiment CLXXXIII. 



Taken to 10 atmospheres, 143 cc. of blood drawn. 



Decompressed at the rate of 1 atmosphere per 3 minutes, very 

 regularly. 



The operation is over at 5:45. 



Removed at 6 o'clock, is paraplegic: right leg almost insensible, 

 left one slightly sensitive, tail sensitive. 



At 7 o'clock, difficult breathing. Ascending paralysis which has 

 invaded the whole body; the ribs no longer move; breathing purely 

 diaphragmatic. 



Found dead the next day. 



Experiment DLXXIV. August 7. Bitch taken to 10 atmospheres, 

 128 cc. of blood drawn. (See Exp. CLXXXV.) 



I make the decompression by means of the graduated cock; in 20 

 minutes, the pressure drops 2Vz atmospheres; in the following 20 min- 

 utes, it drops 1V4 atmospheres, and 1% atmospheres in the following 

 16 minutes; it is then 4V 2 atmospheres, and I open the large cock, 

 which restores normal pressure in 3 minutes. 



It is all finished at 7:31. 



Removed at 7:40, the animal is completely paralyzed; gurgling 

 heard in the heart: 80 extremely irregular heartbeats; 80 to 100 

 respirations, still operated somewhat by the ribs; no apparent un- 

 easiness; great quantity of froth in the mouth. 



Dies at 8 o'clock. 



Left heart: dark blood with a little gas. Right heart: dark blood 

 frothy with fine bubbles of gas. 



Gas in all the veins and arteries, except the veins of the portal 

 system, while the mesenteric arteries are full of it. 



