Compressed Air; Low Pressures 



763 



The analysis of the urines by hypobromite of soda gives: 

 A (normal pressure) 1650 cc. containing 20.15 gm. of urea. 

 B (compressed air) 2010 cc. containing 24.72 gm. of urea. 

 C (compressed air) 1990 cc. containing 26.04 gm. of urea. 

 D (low compression) 2255 cc. containing 21.18 gm. of urea. 

 E (normal pressure) 2080 cc. containing 20.80 gm. of urea. 

 F (normal pressure) 2125 cc. containing 22.50 gm. of urea. 



Experiment CCCXXV. February 9. M. Regnard, one of my assist- 

 ants, 27 years, weighing 75.5 kilos, height 1.83 meters. 



At 1:45, normal pressure; pulse 70; respiratory rate 15.6; pulmon- 

 ary ventilation of 12.28 liters per minute. Maximum expiratory 

 capacity 4.15 liters. 



At 2 o'clock, began the compression. 



At 2:45, compression of +52 cm., left until 4 o'clock. At that time, 

 pulse 57, respiratory rate 14.6; pulmonary ventilation 13.22 liters; 

 maximum expiration 4.64 liters. 



At 4:20, began the decompression. 



At 5:30, normal pressure; pulse 56; respiration 16; pulmonary 

 ventilation 13.02 liters; maximum expiration 4.60 liters. 



Let us see now in summary what these experiments have given 

 us in regard to each important physiological function. The follow- 

 ing table will aid our survey. 



Table XVI 



CCCXXII 



CCCXXII 



CCCXXIII 



CCCXXIV 



CCCXXIV 



CCCXXIV 



I 78 



I 7.6 | 



13.7 

 6.3 [3.8 |68 



I 9 | 6.5 I 3.75 I 78 

 | | 6.54 |3.76 |81 



__|____| |68 



■5 1 | ___ 1 85 | 6.6 | 



8.2 

 8.1 

 7.5 

 8.3 



|4.0 |72|____ | . |3.7 I 



6.5 | 4.0 I 69 I 

 5.86 | 4.08 | 62 | 

 6.74 | 3.96 | 79 | 

 , | 3.92 ! 82 | 



- I - I - 



6.2 | .___ I 60 

 _ | 6.28 | 3.8 I 65 



8 I |3.81|59 



| I 3.80 | 68 



5.6 I f I 58 



Averages 

 CCCXXV 



I 7.7 | 6.4 | 3.75 | 76 

 I 15.6 112.28 14.15 I 70 



| 7.7 | 6.4 | 3.99 | 73 

 I 14.6 | 13.22 I 4.64 I 57 



16. 



| 6.2 |3.78|62 

 I 13.2 I 4.60 I 56 



Respiration. The number of respirations (Columns 2 and 6), 

 which is, as we know, always very difficult to measure exactly on 

 one's self, has sometimes slightly increased, sometimes diminished; 

 the average is the same for compressed air and for normal pressure 

 at the beginning; I do not count Column 10 in which only two fig- 

 ures are listed. 



The amount of pulmonary ventilation (Columns 3 and 7), that 

 is, the quantity of air which passes through the lungs during a 

 minute when the respirations are calm, also remained the same. 



