>M 



CHANGES PRODUCED IN AIR BY RESPIRATION, 



and after the 

 experiment. 



Contents of the Lungs after the Experiment. 

 12*43 cubic inches of azote, 

 213-57 oxigen, 



226 



lated. 



Calculation for Oxigen. 

 Oxigen calcu- 3420 — 85*50 n 3334*50 original oxigen, 



Add 36* 1 6 in the lungs before the experiment^ 



3370*66 i tota * °i uant 'ty ?f oxigen before 

 \ the experiment. 



After the Experiment. 

 100 : 66 : : 250 : 165 oxigen in No. 1. 165 



100:82 :: 168:137*76 -. in No. 13. 137*76 



100 : 81*5 : : 2944 : 2399 '36 in mixt. 2 to 12. 2399*36 



in carbonic acid 396*78 



1 in lungs after expt". 213*57 



3312*47 

 3370*66 original oxigen, ■ ■ 



33 1 2*47 after experiment, 



58*19 deficiency. 



The observed deficiency in this" experiment was 58. 



The deficiency in this case, and in the former experiment 

 with oxigen, though comparatively small, when contrasted 

 with the quantity of gas respired, is larger than the average 

 with atmospheric air ; it seems probable, therefore, that a 

 portion may be detained in the system. It must be remem- 

 bered, that what we call residual gas is not only that con- 

 tained in the substance of the lungs, and in its appendages, 

 but also that contained in the fauces and mouth. 



Deficiency. 



lftth experi- 

 ment. 



Barom. Therm. 



Eighteenth Experiment. 



Cub inches Cub . inch 

 Time. ofoxg?ngas exi;)il . ed Deficiency, 

 inspired. * 



30*15 70 8 45 3130 3000 70. 



The operator breathed as usual, after having made a 

 strong effort to exhaust his lung9 ; his pulse before the ex- 



eriment 



