664 Experiments 



The lungs are the seat of great congestion, with hemorrhagic 

 spots and scattered emphysema. Their density is greatly increased, 

 but they still float. 



Experiment CCXXVI. May 23. Rabbit. Same bell, same decom- 

 pressions, same general results. 



Experiment CCXXVII. March 10. Temperature 15°. Guinea pig 

 weighing 320 gm. placed in the bell of 27 liters. At 2:50, I open the 

 communicating cock between this bell and a large cylinder in which 

 the pressure has been greatly lowered; the pressure in the bell in- 

 stantly falls to 16 cm. The animal does not appear to suffer. Respira- 

 tory rate 129. 



Since the bell is not entirely air-tight, the pressure rises slowly. 



At 3:13, it is 21 cm.; respiratory rate 104. I then open the cock"; 

 the pressure drops to 17 cm.; the animal falls on its side, and rises 

 almost instantly; respiratory rate 112. 



At 3:32, pressure 19 cm., respiratory rate 120; animal quiet. 



At 3:35, third opening of the cock; pressure drops to 16.5 cm.; 

 staggers slightly. 



At 3:42, the pressure has risen to 18 cm. Fourth opening of the 

 cock; pressure falls to 13.5 cm.; the guinea pig falls on its side; respir- 

 atory rate 108. 



At 3:45, pressure 14 cm.; respiratory rate 78; on its side. 



At 3:51, pressure risen to 17 cm. Fifth opening of the cock; pres- 

 sure falls to 11.5 cm.; the animal, which had risen slightly, lies down 

 slowly; respiratory rate 36. 



At 3:55, pressure 13 cm.; respiratory rate 69; on its side. 



4:01, pressure 14.5 cm.; respiratory rate 92; recovered considerably. 



4:08, pressure 14.7 cm., respiratory rate 90. Violent jerking of the 

 feet, the subcutaneous muscles, and the head; from this point to the 

 end, the jerking keeps increasing. 



4:13, 16 cm.; respiratory rate 93. 



4:15, sixth opening of the cock; pressure falls to 13.5 cm.; a little 

 more jerking, but the animal remains on its feet; respiratory rate 

 rises to 108. 



4:21, pressure 15 cm.; respiratory rate 85. 



4:30, pressure 16 cm., respiratory rate 90; seventh opening of the 

 cock; pressure 11.5 cm.; the animal, which has been crouching, raises 

 its head twice, then lies down slowly. The violent jerking stops for a 

 few minutes. 



4:33, pressure 13 cm.; respiratory rate 52. 



4:39, pressure 15 cm.; the animal has remained lying down. Pres- 

 sure lowered to 12 cm.; does not seem to notice it. 



4:46, pressure 14.5 cm.; respiratory rate 66. 



4:53, ninth opening of the cock; pressure falls to 11.5 cm.; the 

 animal raises its head, but remains lying down. 



4:55, pressure 12 cm.; respiratory rate 84. 



4:58, pressure 13 cm., respiratory rate 60. 



4:59, tenth opening, which lowers the pressure to 10.7 cm.; the 

 animal struggles considerably, and gets on its side. 



5:00, pressure 11 cm.; respiratory rate 55. 



