Sudden Changes in Pressure 875 



At 4:04, opened the cock wide; in 1 minute, the pressure falls to 



5 atmospheres; I then keep the cock open a little; the pressure is 

 down to normal at 4:30. 



Opened the apparatus: the guinea pig seems in good condition; 

 but at 4:40, he struggles, rolls up, is paralyzed in ascending progress, 

 the respiration is disturbed, and stops at 4:45. 



Gas in abundance in the right heart, in the veins of the legs and 

 the arteries. No gas in the left heart, the pulmonary and coronary 

 veins, and the portal system. 



No gaseous distention of the stomach and the intestines. 



Experiment DLXVI. June 20. Cat, placed beside the guinea pig 

 of the preceding experiment. 



Taken to 10 atmospheres. Dropped in 1 minute to 5 atmospheres, 

 then in 25 minutes to normal pressure. 



No immediate or delayed symptom. 



Experiment DLXVII. June 29. Cat and rabbit brought in 1V2 

 hours to 10 atmospheres. Pressure maintained under a current of air 

 for 5 hours. 



Decompression in 2 hours. 



They are taken out all wet, trembling (the cat was trembling in 

 the apparatus in the compressed air), they did not cry out; no 

 paralysis; they recover rapidly and survive. 



The temperature of the cat has fallen from 39.5° to 34.3°; that 

 of the rabbit from 39.6° to 36.7°. 



Experiment DLXVIII. July 2. Rabbit of Experiment DXX. From 

 2:50 to 3:55, raised to 10 atmospheres; current of air for 30 minutes. 



The decompression is begun at 4:27; it is made with calculated 

 slowness, watch in hand, at the rate of about 1 atmosphere per 2 

 minutes; it is finished at 4:47. 



The rabbit seems well. However, it is seized by paraplegia about 



6 o'clock, still preserving its sensibility; still living at 7:30; found 

 dead the next day. 



Experiment DLXIX. July 2. White cat placed beside the rabbit 

 of the preceding experiment. 



Taken to 10 atmospheres, decompressed regularly in 20 minutes. 



The white cat cries out, breathes with difficulty; at the end of 

 a few seconds, seems furious, bites itself, bites the gray cat of the fol- 

 lowing experiment, which is stretched out near it. Has convulsive 

 quiverings; its pupils are very much dilated. Dies in 5 minutes. With 

 the greatest precaution I draw gas from the right heart; the 23.8 cc. 

 of gas which I obtain thus contain 15.9% of CO,, the rest is nitrogen, 

 without a trace of oxygen. 



Gas in all the circulatory system: veins, arteries, portal system, 

 inner vessels of the spinal cord. The latter is very hard and shows 

 no sign of tearing. 



Experiment DLXX. July 2. Gray cat, placed beside the animals 

 of the two preceding experiments. 



Is dying when taken out, and dies immediately afterwards. 



