560 Experiments 



exercise of the bodily functions and no longer permitted respira- 

 tory movements. 



I even think that it is to the temperature that we must attribute 

 results somewhat different from those I reported above, obtained 

 with the same apparatus, but during a cooler season. 



Experiment CV. January 31. House sparrow. At 3:50, taken to 4 

 atmospheres. Died at 5:50. No cranial suffusions. 



Lethal air: CO* 5.8; O* 13.2. 



CO x P = 23.2. 



Experiment CVI. March 18. House sparrow. At 2: 10 taken to 6 

 atmospheres. Very sick at 3:30; found dead at 4:50. Red dots on 

 cranium. 



Lethal air: CO. 3.9; O* 14.9. 



CO* x P = 23.4. 



B. Superoxygenated air: pressures below one atmosphere. 

 It is here that I think I should place the account of the experi- 

 ments made by the method discussed on page 536 (Sub-chap. 1), in 

 which the sparrows were kept in closed vessels, at pressures less 

 than one atmosphere, but in superoxygenated air. Here, down to 

 the low limits indicated, death took place not through too low 

 oxygen tension but through too high carbonic acid tension, that 

 is, through a mechanism identical with the one we are discussing 

 now. 



Here are the details of these experiments, all made with spar- 

 rows; the first two are a repetition of the classic experiments of 

 Claude Bernard. 



Experiment CVII. January 16. Bell-jar of one liter. 

 The bird was brought successively three times to a 40 cm. drop 

 in pressure, the pressure each time being restored to normal by the 

 admission of oxygen. The, mixture then contained 91 per cent of 

 oxygen. I left the bird at normal pressure, and closed the cocks at 3 

 o'clock. 



Died at 6:15; lived 3 hours 15 minutes. 

 Lethal air: CO* 24.8; O* 64.5. 



CO= + O2 = 89.3. The ratio of the carbonic acid formed to the 

 oxygen consumed was: 



CO, 24.8 



= = 0.93. 



O2 26.5 



Experiment CVIII. January 16. Bell- jar of 1 liter. 



Brought three times in succession to a 40 cm. drop in pressure; 

 actual pressure, 36 cm. 



Closed cocks at 2; 30; death at 6:15. Pressure 34 cm. Original mix- 

 ture: O* 82, 



