Death in Closed Vessels 521 



Experiments XXXIII -XXXIV, simultaneous. June 14. Tempera- 

 ture 22°; pressure 76.5 cm. House sparrows. 



XXXIII. Bell of 3.2 liters. 



Begun at 4:16; moderate agitation. At 4:21, pressure decrease of 

 43 cm.; vomits, is tired; at 4:22, pressure is 23 cm.; very sick. Cocks 

 closed. 



At 4:26, still on its side; rises later. Dies at 5:20. At 5:31, tem- 

 perature 32°, not stiff. At 5:40, 30.7°. 



Lethal air: O2 11.2; CO* 7.6. 



CO, 



CO* + O2 = 18.8; == 0.78. 



O2 



XXXIV. Bell of 2.8 liters. 



Begun at 4:19; moderate agitation. At 4:25, pressure of 25 cm.; 

 vomits. Cocks closed. 



Not so sick as the preceding bird. At 4:27, pressure dropped to 

 24.5 cm.; panting hard. At 5:27, dies with convulsions. At 5:40, the 

 temperature is 31.6°; at 5:52, it is 29.4°. Lived 1 hour 2 minutes in the 

 equivalent of 0.9 liter of air; or 1 hour 7 minutes per liter. 



Lethal air: O2 11.3; CO2 8.1. 



CO2 



CO2 + 02 = 19.4; = 0.84. 



O2 



Experiments XXXV - XXXVI, simultaneous. July 26. Temperature 

 22°; pressure 76 cm. House sparrows. 



XXXV. Bell of 2.25 liters. 



Brought in a few minutes to a pressure of 55 cm. Cocks closed 

 at 1:45. 



Dead at 3:25. Therefore lived 1 hour 40 minutes in a bell the 

 capacity of which represented 1.6 liters at normal pressure; or 1 hour 

 3 minutes per liter. At 3:33, rectal temperature 28°. 

 Lethal air O2 4.6; CO2 13.4. 



CO' 



CO2 + O2 = 18.0; = 0.81. 



O2 



XXXVI. Bell of 3.2 liters. 



Brought to a pressure of 47 cm. Cocks closed at 2 o'clock. Dead 

 at 3:53. Lived 1 hour 53 minutes in a capacity equivalent to 2 liters; 

 or 57 minutes per liter. 



At 4 o'clock, rectal temperature 27°. 



Lethal air: O2 5.5; CO-' 12.4. 



CO2 



CO.- + 02 = 17.9; = 0.80. 



O2 



Experiment XXXVII. March 18. Pressure 76 cm. 

 House sparrow, placed at 1:45 under a bell of 3.2 liters. The pres- 

 sure is lowered to 38 cm. Dead at 3:15. A few spots in the cranial 



