Symptoms of Decompression 697 



was carried on by my regretted colleagues and friends, MM. 

 Croce-Spinelli and Sivel. 



Fig. 56 — Respiration of superoxygenated air, expanded by decrease of 

 pressure. 



Experiment CCLIV. February 20, 1874. Outside pressure 758 mm. 



2:30, I enter and seat myself comfortably in the cylinders, hav- 

 ing with me a bag filled with air extremely rich in oxygen; beside 

 me, a sparrow in a cage. 



. My pulse rate is 64; my temperature taken under the tongue 

 with great care is 36.5°; an expiration in a Hutchinson spirometer 

 gives me a value fixed on the arbitrary scale as 17.3. 



2:37, the door is closed, the decompression begins. 



2:45, pressure 710 mm.; pulse 68. 



2:58, pressure 590 mm.; pulse, 70; I am at a decompression cor- 

 responding approximately to the elevation of Mexico, 2150 meters. 



3:02; 535 mm.; pulse, 73. 



3:06; 500 mm.; intestinal gases escape. 



3:08; 465 mm.; pulse, 78. 



3:12; 450 mm.; pulse, 84; it is the barometric pressure of Cala- 

 marca, at 4150 meters; I have slight nausea. 



