572 Experiments 



Experiment CXXXIX. January 19. 



The sparrow being in the apparatus, a little air was removed by 

 the pump, and replaced by oxygen which was raised to 2 atmospheres. 

 When air was taken for analysis, the pressure fell to 1 and % atmos- 

 pheres. 



Closed cocks at 2:40; dying at 4:45; found dead at 5:30. 



Original mixture contains 83.6 per cent of oxygen. 



Tension of this oxygen = 83.6 x 1.75 = 146.3, which corresponds 

 to 7.3 atmospheres. 



Lethal air: CO 11.9; 0= 67.8. 



CO2 tension = 11.9 x 1.75 = 20.8. 



Experiment CXL. January 22. 



Put at 2 atmospheres, one of which is oxygen. 

 Entered at 3:05; at 5:30, still breathing; found dead at 6:30. 

 The original mixture contains O2 58.8. 



The oxygen tension was 117.6, corresponding to 5.6 atmospheres. 

 Lethal air: CO 13.4; O2 44.4. 

 CO tension = 13.4 x 2 = 26.8. 



Experiment CXLI. February 1. 



Raised to 4 atmospheres, 3 of which are oxygen. After about a 

 half hour, slight convulsions; dies in about an hour. 



Cranial suffusions and venous blood very red; no gas in the blood. 



Original mixture: O2 75.6. 



Tension of this O2 = 75.6 x 4 = 302.4 corresponding to 14.4 atmos- 

 pheres. 



Lethal air: CO2 2.1; O2 71.1. 



CO2 tension = 2.1 x 4 = 8.4. 



Experiment CXLII. February 17. 



Raised to 5 atmospheres of air, to which are added 3 V2 atmos- 

 pheres of oxygen. After 5 minutes, convulsions ensue; the bird dies 

 in 20 minutes. 



Blood red everywhere, even in the liver; no gas (cranium not 

 examined). 



Lethal air: CO2 0.8; O2 47.8. 



CO2 tension = 0.8 x 8.5 = 6.8. 



The oxygen tension in the original mixture must have been about 

 51 x 8.5 = 433.5, corresponding to 20.7 atmospheres. 



Experiment CXLIII. February 19. Seltzer water apparatus. 



Put into the air to which V4 atmosphere of oxygen was added; 

 closed at 4:25; dead about 6 o'clock. 



No bloody suffusions on the cranium; venous blood black. 



Lethal air: CO2 22.1; O2 3.5. 



CO2 tension = 22.1 x 1.25 = 27.6. 



The original oxygen tension must have been about 26 x 1.25 = 32.5, 

 which corresponds to 1.5 atmospheres. 



Experiment CXLIV. February 20. 



I atmosphere of air; plus V2 of oxygen. 



When the bird, thought dead, is withdrawn, it still exhibits some 



