602 Experiments 



Brought back to normal pressure, the dog continues to howl and 

 breathe very quickly and very noisily, as it has done since blood A 

 was extracted. 48 cc. of very red blood then extracted . . . . B 



The animal when untied, cannot walk; it is not paralyzed in any 

 limb, and yet cannot stand up on all-fours. 



Next day, same condition, except that the respiration is easy. 



It dies at the end of several days, having remained drowsy and 

 unable to walk. In the autopsy a gray cerebral softening is found. 

 Evidently bubbles had entered the circulatory system, some of which 

 penetrated the nervous centers and cut off the circulation. 



Blood A (56 cm.) contains per 100 volumes: O 20.9; CO 35.3 



Blood B (76 cm.) contains per 100 volumes: Ch 26.4; CO* 22.7 



I shall not include in the general discussion of the experiments 

 the preceding curious result; but I thought I should not omit it. 

 I call the reader's attention to the localized cerebral softening due 

 to the penetration of the air. 



Experiment CLXIX. April 30. Pressure 77 cm.; temperature 16°. 

 Dog weighing 11.5 k. 



At 4:25, put into the apparatus, and brought in 10 minutes to 36 

 cm. of actual pressure. At 4:45, 46 cc. of very dark blood drawn from 

 the right carotid .... A 



5 o'clock. Returned to normal pressure; at 5:05, 46 cc. of very red 

 blood drawn . . . . B 



Blood A (36 cm.) contains per 100 volumes: O 11.9; CO* 25.2 



Blood B (77 cm.) contains per 100 volumes: O 20.6; CO 39.0. 



Experiment CLXX. May 1. Pressure 76 cm.; temperature 16°. 

 Dog of preceding experiment, quite recovered. 



4:15. 41 cc. drawn from left carotid; respiratory rate 60 .... A 



4:30. Put into the large receiver; at 4:45, pressure lowered 33 cm., 

 air admitted to 30 cm. (pressure 46 cm.). At 4:45, 38 cc. of blood 

 drawn . . . . B 



Brought to 56 cm. of actual pressure; at 5:15, respiratory rate 100; 

 41 cc. of blood drawn . . . . C 



Brought slowly to normal pressure; at 6:20, respiratory rate 60; 

 41 cc. of blood drawn . . . . D 



Blood A (76 cm.) contains per 100 volumes: O 21.9; CO^ 34.7. 



Blood B (46 cm.) contains per 100 volumes: O 20.3; CO 30.5. 



Blood C (56 cm.) contains per 100 volumes: O 21.1; CO 34.7. 



Blood D (76 cm.) contains per 100 volumes: O 21.1; CO 35.2. 



The average between A and D is: O^ 21.5; CO 34.9. 



Experiment CLXXI. May 3. Pressure 76 cm. Young dog, very 

 lively, weighing 4 k. Right carotid. 



4:32. Put into the receiver; at 4:45, lowered 45 cm., respiratory 

 rate 24, divided into periods of 3 or 4 medium and 1 very deep; then 

 rest. 



4:58. The decompression has varied between 44 cm. and 47 cm.; 

 at present it is 45 cm.; 31 cm. of actual pressure. 41 cc. of blood drawn, 

 darker than ordinary venous blood .... A 



