Experiments 



3:14; 450 meters.; pulse drops to 80; nausea disappears; the ab- 

 domen is slightly distended; my face feels congested and I have 

 slight dizziness . 



3:17; 430 mm.; pulse, 84. I breathe oxygen three times; my pulse 

 falls to 78; dizziness. 



3:21; pressure is only 418 mm.; which corresponds to the eleva- 

 tion of Mont Blanc, 4800 meters; my pulse rate continues to drop 

 after some breaths of oxygen; it is only 70; at each respiration, dizzi- 

 ness. 



3:23; 420 mm.; I rise breathing air; my pulse rate rises im- 

 mediately to 96, then to 100; I have outright vertigo; I sit down 

 again. 



3:25; 445 mm.; pulse rate drops to 90, then after a breath of 

 oxygen, to 70, at 3:26, at a pressure of 460 mm. 



3:28; 450 mm.; the bird falls in its cage. 



3:30; 440 mm.; pulse, 76; belching of gas. 



3:32; 435 mm. Wishing to raise my right leg without leaving my 

 chair, it was seized with convulsive trembling in the muscles of 

 the calf and thigh, a trembling which I could not control with 

 my hand; it ceased when I placed my foot firmly on the floor; tem- 

 perature under the tongue is 36.8°. 



3:34; 443 mm.; pulse, 80; a breath of oxygen. 



3:35; 445 mm.; pulse rate falls immediately to 70; trying to 

 whistle at this moment, I note that it is impossible. 



3:37; 436 mm.; pulse, 80. 



3:39; 430 mm.; I breathe into the spirometer; dizziness; I am now 

 only 11.8 (on the arbitrary scale mentioned above). 



3:43; 435 mm.; pulse, 80. 



3:45; 423 mm.; pulse 90. I take several breaths of oxygen; dizzi- 

 ness. 



3:47; 423 mm.; pulse rate has fallen to 69. 



3:48; 423 mm.; I move about on my chair; slight dizziness. 



3:49; 425 mm.; pulse 78. 



3:50; 420 mm.; pulse 86. 



3:51; 418 mm.; pulse 87; I take a breath of oxygen. 



3:53; 426 mm.; pulse 78. 



3:55; 430 mm.; pulse 80; some breaths of oxygen; dizziness. 



3:57; 430 mm.; pulse 72. 



3:59; 420 mm.; pulse 84. I am quite uncomfortable; having found 

 that the number of my heart beats for 20 seconds was 28, I have 

 very great difficulty in multiplying this number by 3, and I write 

 in my notebook "hard to calculate." 



4:01; 413 mm.; pulse 88. 



4:03; 408 mm.; pulse 92; painful nausea; dizziness; congestion in 

 the head; convulsive trembling when I raise my leg. 



4:04; 415 mm.; pulse 90; I breathe oxygen; dizziness. 



4:05; 416 mm.; pulse only 75. 



4:07; 420 mm.; I breathe into the spirometer, and go only to 

 9.9; dizziness and vertigo after having breathed. 



4:09; 430 mm.; temperature under the tongue, 36.7°. 



