514 Experiments 



I now come to the experiments made with the apparatus pic- 

 tured in Figure 15. 



Experiment IV. March 24, temp. 15°, pressure 75 cm. House spar- 

 row. Bell of 5 liters. 



Entered at 2:04. Began current of air with steam engine, cock M 

 being open. At 2:10, decompressed 10 cm.; at 2:12, 15 cm.; at 2:14, 20 

 cm.; at 2:17, 25 cm.; at 2:20, 30 cm. 



The cock is closed and the decompression continued. At 2:23, 

 32 cm.; at 2:30, 40 cm.; at 2.37, 52 cm.; actual pressure 23 cm. 



Cock D is then closed. The pressure is perfectly maintained at 

 23 cm. with absorption of about 1 half-centimeter. The bird dies at 

 3:55, and therefore lived in 5 liters of air at 22.5 cm., which represent 

 about 1.4 liters at normal pressure, for 1 hour 35 minutes. 



Composition of lethal air: O 10.3; COa 7.5. 



CO* 



CO2 + O* = 17.8; = 0.70. 



O2 



Experiment V. March 25; temperature 15°; pressure 75 cm. House 

 sparrow. Bell of 3.200 liters. 



Entered at 1:50; current of air. At 1:53; pressure down 10cm.; 

 at 1:59, 21 cm.; at 2:02, 33 cm.; at 2.05, 45 cm.; cocks closed: actual 

 pressure 29 cm. 



Lethal air: O2 9.3; CO2 11.2. 



CO 



CO2 + O = 20.5; = 0.96 



O2 



Experiments VI to IX, simultaneous. May 6; temperature 16°; 

 pressure 76.4 cm. Vigorous male mountain sparrows. 



VI. Bell of 2.5 liters. 



Entered at 3:42. Left at normal pressure. At 6 o'clock, very sick; 

 respiratory rate 128; at 6:25, respiratory rate 120. Dies at 7:05. Lived 

 three hours 23 minutes. 



Lethal air: O* 3.5; CO2 14.6. 



CO= 



CO + O2 = 18.1 ; = 0.84 



O2 



VII. Bell of 3.2 liters. 



Entered at 3:42. Current of air; at 3:55, pressure down 6 cm.; at 

 4 o'clock, 16 cm.; at 4:04, 21.4 cm. Cocks closed. Actual pressure 55 cm. 



At 4:19, fairly calm, respiratory rate 120; at 5:08, respiratory rate 

 116; at 6 o'clock, respiratory rate 112, does not seem sick; at 6:25, 

 respiratory rate 108, still well enough. Dies at 8:35. 



Lived 4 hours 31 minutes, in 3.2 liters of air at 55 cm., which 

 represent 2.3 liters at 76 cm. 



Lethal air: O2 4.5; CO2 14.4. 



CO* 



CO* + O2 = 18.9; = 0.84 



02 



