546 Experiments 



that the duration of life of the new-born kittens was about four 

 times greater. These two facts agree with what is known about 

 the vital resistance of new-born animals. 



Finally, it is interesting to note that the ratio between the 

 oxygen consumed and the carbonic acid produced was considerably 

 higher in the new-born than in the adults: its average, in fact, is 

 0.97, while for adults it is only 0.86. 



DOGS. Experiment LXIX. March 11. Dog weighing 4.3 kilos. 

 Bell- jar of 31 liters. 



Entered at 1:40 at a pressure of 43 cm. Uneasy; lies down at 2 

 o'clock; found dead at 2:20. 



Air at 2 o'clock: O2 5.5; CO2 16.1. 



Air after death, O 5.4; CO 16.7. Oxygen tension = 3.0. 



RABBITS. Experiment LXX. March 15. Rabbit. Bell-jar of 11.5 

 liters. 



Entered at 2:28. Left at normal pressure. 



At 3:50, standing, panting; at 3:55, struggles; at 4 o'clock, falls; 

 at 4:30, last breath, without convulsions. Fifteen minutes after, its 

 rectal temperature is 34°. 



Lethal air: O2 3.7; CO2 15.2. 



CO2 



C02 + ©2=18.9; = 0.96. Oxygen tension = 3.7. 



O2 



Experiment LXXI. March 16. Rabbit weighing 1.900 kilos. Bell- 

 jar of 20.75 liters. 



Began at 2:05; at 2:25, the pressure is only 41 cm. Cocks closed. 

 At 2:55, uneasiness; at 3:20, great uneasiness; at 3:35, falls; at 3:50, 

 dead without convulsions; 5 minutes after, the rectal temperature is 

 35.3°. 



Lived 1 hour 25 minutes in 18.85 liters of air at 41 cm., which 

 gives, per liter and per kilogram, a duration of 16 minutes. 



Lethal air: O2 5.9; CO2 13.3. 



CO* 



CO2 + O2 = 19.2; = 0.81. Oxygen tension = 3.2. 



O2 



Experiment LXXII. March 14. Pressure 76.6 cm.; temperature 

 13°. Rabbit weighing 1.340 kilos. Bell-jar of 31 liters. 



At 2:27, began the current of air; the manometer rises slowly; 

 at 2:58 pressure lowered 41 cm.; up to that point the animal remained 

 perfectly quiet. At 3:02, pressure lowered 50 cm.; rabbit becomes 

 uneasy; the inlet cock is closed, and pumping continued. At 3:07, the 

 pressure is only 15.6 cm.; the animal lies down. At 3:12, it is 16 cm. 

 Dead at 3:20. 



Lethal air: O2 19; CO2 1.6. 



CO.- 



CO2 + O2 = 20.6; = 0.84. Oxygen tension = 4.0. 



O2 



