Death in Closed Vessels 515 



VIII. Bell of 5 liters. 



Entered at 3:42: current of air. At 3:55, pressure down 8 cm.; at 

 4 o'clock, 16 cm.; at 4:04, 19 cm.; at 4:07, 40 cm. Actual pressure 36.4 

 cm. Cocks closed. 



At 4:19, respiratory rate 150, calm; at 5:08, respiratory rate 126; 

 at 6 o'clock, very sick, respiratory rate 128; at 6:25, respiratory rate 

 150; dies at 7:10. 



Lived 3 hours in 5 liters of air at 36.4 cm., which represent 2.4 

 liters at 76 cm. 



Analysis lost. 



IX. Bell of 11.5 liters. 



Entered at 3:42: current of air. At 3:55, pressure down 14 cm.; at 

 4 o'clock, 29 cm.; at 4:04, 38 cm.; at 4:07, 52 cm.; at 4: 11, 59 cm. Cocks 

 closed. Actual pressure 17.4 cm. 



Very sick afterwards. At 4:19, respiratory rate 140; at 4:22, dies 

 with convulsions. Lived 11 minutes. 



Lethal air: O? 19.6; CO? 0.6. 



Experiments X to XII, simultaneous. May 11; temperature 16°; 

 pressure 75.5 cm. 



X. Male mountain sparrow. Bell of 2.2 liters. 



From 3:20 to 3:22 the pressure is dropped suddenly to 20 cm. 

 Immediately, collapse of bird, and death at 3:24, after convulsions. It 

 was not thought necessary to take an air sample for analysis. 



The left heart contains dark blood; no gas in the blood. 



XI. House sparrow. Bell of 3.2 liters. 



Brought from 3:15 to 3:17 to a pressure of 24.5 cm. Collapses 

 a moment, then recovers very well. Dies at 3:52. Lived 38 minutes 

 in a bell the capacity of which, when reduced to a pressure of 76 cm., 

 represented 1.03 liters of air. 



Lethal air: 0* 12.8; CO? 6.2. 



CO? 



CO? + O? = 19.0; = 0.76 



O? 



XII. House sparrow. Bell of 4.6 liters. 



Brought in a few minutes to a pressure of 34.3 cm.; hardly seems 

 to notice it. Cocks closed at 3:09. 



At 4:50, very sick, but still on its feet. Dead at 5:45. Lived 2 

 hours 34 minutes in a quantity of air representing 1.89 liters at 76 cm. 



Lethal air: O? 8.2; CO? 10.8. 



CO? 



CO? + O? = 19.0; = 0.85 



O2 



Experiments XIII to XV, simultaneous. May 24; temperature 17°; 

 pressure 76.5 cm. House sparrows. 



XIII. Bell of 2.5 liters. 



Entered at 3:31: current of air. At 3:35, actual pressure 37 cm.: 

 cocks closed. The bird does not seem uncomfortable. 

 Dies at 5:20. Lived 1 hour 45 minutes in a quantity of air which repre- 



