264 On the Changes produced in Atmospheric Air - 



* 

 After the Experiment. 



100 : 66 : : 250 : 105 oxygen in No. 1. 165 



100:82 : : 168 : 137*70 — in No. 13. 137*76 



100 : 81-5 : : 2044:2399*36 in mixt. 2. to 12. 2399*36 



i — r~ in carbonic acid 396*78 

 r in lungs after expt. 213*57 



3312*47 

 3370*66 original oxygen, ■= — ;— r—.~ 



33 12 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 oxygen, 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. 



Cub. Inches 



Eighteenth Experiment, 



Cub. Inches. 

 Barom. Therm. Time. of oxygen gas v ' ul ^ ' -"^j 1 " Deficiency, 



inspired. " 



30*15 70° 8 / *45 // 3130 3060 70. 



The operator breathed as usual, after having made a strong 

 effort to exhaust his lungs • his pulse before the experiment 

 was 84, the thermometer under his tongue 98° : after the 

 experiment his pulse was 96, and the thermometer under his 

 tongue still 98° ; the same gentle glow and perspiration was 

 felt as in the other experiments on oxygen ; a portion of the 

 gas was saved from each of the mercurial gasometers, ancj 

 their amounts were as under : 



No. 1, - - 196 



2. - - - 228 



3. 284 



4. 294 



5. 248 



6. - - 280 



7. - - 258 



8. 



