520 Experiments 



Experiments XXIX to XXXII, simultaneous. June 10. Tempera- 

 ture 21°; pressure 75.5 cm. House sparrows. 



XXIX. Bell of 11.5 liters. 



Begun at 2 o'clock. Struggles a great deal; at 2:08, a pressure drop 

 of 40 cm.; grows calm for a moment, then struggles again. At 2:12, 

 the pressure drop is 47 cm.; no longer moves; a little out of breath. 

 At 2:16, drop of 55 cm.; more out of breath, vomits. At 2:17, the pres- 

 sure is only 17.5 cm. Cocks closed. 



The bird is breathing with great difficulty, and remains lying 

 down. It dies with convulsions at 2:20, that is, after 3 minutes. The 

 air hardly contains traces of carbonic acid. 



XXX. Bell of 11.5 liters. 



Begun at 2:45; struggles a good deal. At 2:50, the pressure is 

 decreased 42 cm.; the bird grows calm; at 2:53, a decrease of 44 cm.; 

 staggers, vomits, but begins to struggle again. At 2:56, a decrease of 

 52 cm.; suffers greatly. At 3:05, a decrease of 56 cm.; falls and seems 

 about to die. A little air is admitted until the decrease is only 49 

 cm. At 3:08, since the bird seems to have recovered fairly well, the 

 decompression is resumed; at 3:11, a decrease of 58 cm.; convulsive 

 struggling, death imminent; we return to a decrease of 49 cm. At 3:16, 

 fairly well recovered; at 3:18, a decrease of 56.5 cm.; not too sick. 

 Cocks closed. 



At 3:35, the bird vomits; at 3:55, as it is not too sick, the decom- 

 pression is carried to 57.5 cm.; that is, an actual pressure of 18 cm.; it 

 immediately becomes uneasy, but death does not occur until 4:30. 



Therefore it lived 1 hour 4 minutes in a quantity of air represen- 

 ting 2.70 liters; or 23 minutes per liter. 



Lethal air: Cb 17.7; CO2 2.8. 



CO 



CO-» + 0= = 20.3; = 0.87. 



O 



XXXI. Bell of 1.9 liters. 



Begun at 3:35. At 3:45, the pressure is 41.3 cm. Cocks closed. 

 Dead at 5:23; at 5:30, rectal temperature 28°. 

 Lived 1 hour 45 minutes in a bell corresponding to 1.03 liters; 

 or 1 hour 40 minutes per liter. 

 Lethal air: O2 6.5; CO 12.9. 



CO 



CO + O2 = 19.4; = 0.89. 



o= 



XXXII. Bell of 1.5 liters. 



Begun at 3:35. At 3:45, a pressure of 48.5 cm. Closed. 



Dead at 5:10. At 5:20, temperature 24.8°. Lived 1 hour 25 min- 

 utes; the capacity corresponded to 0.92 liters, or 1 hour 32 minutes 

 per liter. 



Lethal air: O 5.2; CO-* 14.1. 



CO* 



CO* + Os = 19.3; = 0.89. 



Oa 



