ON RESPIRATION; .295 



in an experiment, where more than 3000 cubic iiicheg of tionofnitw- 

 oxigen passed through the lungs in seven minutes and a fhe beginning* 

 quarter, 6-2 cubic inches of azote were found in the fivst 550 of the process . 

 cubic inches expired, though the gas originally contained but 

 ^2*5 per cent, or only 6 cubic inches in this quantity ; in the 

 two next portions expired, consisting of 5V>2 cubic inches, 

 ■we found 56 cubic inches of azote, though this quantity of 

 gas,^ before it was respired, contained only 14; these fivst 

 portions were given off in about two minutes, and con- 

 tained nearly 100 cubic inches of azote mere than could be 

 accounted for in the oxigen employed; hence it is plain, 

 that a large proportion of the increase is evolved in tlie 

 first periods of the process. 



Our intention was particularly directed to this poi .*; in Experiment. 

 the following experiment. The oxigen, procured as usual ^'^'sen respir, 

 from hyperoxigenised muriate of potash, w^s found to con- 

 tain four per cent of azote; the experiment was conducted 

 in the same manner as the preceding ones, exocpt that the 

 tubes of the gasometers were filled with oxigen, and the gas 

 was not merely passed once through the lungs, but breathed 

 backwards and forwards. In order to prolong the duration 

 of the experiment, which began and ended with a forcible 

 expiration, portions of respired gas were preseived for 

 examination-from each of the gasometers, in the following 

 order : 



No. 1. 



244 



No. 5. 



230 



No. 9.^ 



262 



2. 



294 



6. 



266 



10. 



168 



3. 



282 



7. 



254 







4. 



266 



8. 



288 





2544 



The portion of oxigen remaining in the water gasometer 

 of the 'Origiaal quantity, not employed iu the experimjent, 

 was found upon .trial to contain four per cent of azote, as 

 before: j - ^ 



Summary of fhe Experiment, 



Cub. Inches Cub. Inches Defici- Summary. 



Bar. Therm, of Oxigen of Gas ex- ency. Time. 

 . .-.•,.,*-.-.•'.,» ,,,• inspired. pired. . t\' 



^^\% , ,51 j 2668 2544 124 13 minutes; 

 here tlie de%iency was greater th^n we had ever remarked Deficiency 

 before ; but on passing axv equal cjuanjtity of common air "'^'"y 8r«at, 

 -if;\i,> from 



