760 Experiments 



which the lips support without inconvenience or effort, is con- 

 nected by a large rubber tube and a Y-shaped piece of copper to 

 two glass tubes, each of which contains a membraneous valve, like 

 those used by MM. Denayrouze in their well-known apparatuses; 

 these valves are excellent, very delicate, and hold very well, if they 

 are kept wet. As they are placed in opposite directions, one per- 

 mits only the intake of inspired air, the other the escape of expired 

 air, which a rubber tube suitably placed conducts to the gasometer. 

 Of course the nose is closed the whole time by a sort of pincer to 

 which one easily becomes accustomed. 



I breathed thus for 10 and sometimes 20 minutes, remaining in 

 perfect calmness, reading, and merely looking at the time or count- 

 ing my respirations; sometimes the assistant did this for me, look- 

 ing in through one of the glass portholes. 



Besides, I regulated all the other conditions of my life very care- 

 fully; every day I went to the laboratory and sat there from 2 to 6 

 hours in or out of the apparatus; I took no other exercise. 



It was with all these precautions that the following experiments 

 were carried on. 



Experiment CCCXXII. November 6. I begin by putting myself 

 regularly on the following diet, which previous tests showed me was 

 suitable. My weight is 73 kilos; height, 1.73 meters. 



At lunch (12:15); two medium sized eggs, 70 gm. of lean mutton, 

 140 gm. of bread, 800 cc. of a mixture half wine and half water. 



At dinner (7 o'clock) : 120 gm. of lean beef, 200 gm. of mashed 

 potatoes, 6 brandied cherries, bread and wine as at lunch. 



November 7. After having emptied my bladder at noon, I keep 

 my urine until Nov. 8, at noon .... A 



I do the same the following days. 



This day I remain at normal pressure. 



November 8. I place myself in the cylinder from 3 o'clock to 6 

 o'clock; but I keep a current of air at normal pressure. 



Urine from Nov. 8 to Nov. 9 B 



November 9. Seated at 2:45 in the open apparatus; pulse 78; 

 respiratory rate 8; maximum expiration 3.7 liters. 



At 3:18, compression begun. 



At 3:45, pressure +30 cm. 



At 4 o'clock, pressure +45 cm.; pulse 80; maximum expiration 4 

 liters. 



At 4:12, pressure +53 cm. 



At 4:42, same pressure; pulse 72. 



At 5:10, same pressure; respiratory rate 8.2; maximum expiration 

 4 liters. 



At 5:32, the pressure was maintained at the same level; I begin 

 the decompression; I leave the apparatus at 6:53. 



At normal pressure, maximum expiration 3.7 liters. 



