728 Experiments 



Experiment CCLXXXVIII. January 24, temperature 17°. Vigor- 

 ous bulldog. 



Rectal temperature 38.5°. 



At 2:30, 33 cc. of carotid blood drawn; the animal breathes 

 quietly, by natural channels A 



Tube placed in the trachea; respiration becomes much more 

 rapid. 



At 2:45, 33 cc. of blood drawn B 



At 3:25, the animal is placed in the apparatus, with the bag 

 containing superoxygenated air. 



At 3:45, pressure 4 atmospheres, 41 cc. of blood drawn C 



At 4:03, pressure has risen to 6 and % atmospheres; 57 cc. of 

 blood drawn D 



At 4:07, decompression in 3 minutes. Rectal temperature 37°; 

 the animal is in strong convulsions. 



At 4:33, the rectal temperature has fallen to 36°. 



At 4:35, I administer chloroform; the first application causes con- 

 vulsions, which soon cease, and the animal becomes insensible and 

 in resolution. I stop administering chloroform at 4:45. Up to 5:55, 

 there are no more convulsions. Then they reappear. 



The animal survives. 

 Blood A (air, normal pressure, respiration by natural channels) 



2 16.0; C0 2 41.5 

 Blood B (air, normal pressure, tracheal respiration) 2 23.4; CO. 15.2 

 Blood C (oxygen, pressure 4 atmospheres) . . . 2 28.5; CO, 68.3 

 Blood D (oxygen, pressure 6% atmospheres) . . . 2 30.7; C0 2 82.0 



Since the bag from which the animal had breathed contained 

 after the experiment 74.5% of oxygen and 8.6% of carbonic acid, we 

 can reckon at 300 the oxygen tension at the moment when blood C 

 was drawn, that is, 15 atmospheres of air, and at 510 at the moment 

 when blood D was drawn, that is, 25 to 26 atmospheres. 



Experiment CCLXXXIX. January 28. Large dog, fasting since 

 the morning of January 27. 



At 2:35, I draw 33 cc. of carotid blood, moderately red. ... A 



I mix a few cubic centimeters of it with distilled water, to ex- 

 amine it for sugar (a). The rectal temperature is 38°. 



The trachea is not opened, but the muzzle, pictured in Figure 37, 

 is fitted to the animal, and at 3:15 the dog is placed in the apparatus 

 with the oxygen bag. 



At 3:50, the pressure is 6% atmospheres. Decompression is made 

 in 5 minutes. 



The animal is in strong convulsions; tonic stiff enings, clonic con- 

 vulsions. Attacks provoked at will. 



At 4 o'clock, I draw during the convulsions 23 cc. of dark carotid 

 blood B 



Rectal temperature is only 36.5°. 



At 4:25, drew 33 cc. of moderately red blood; the animal has 

 just had an attack C 



At 4:50, the temperature is only 36". 



