260 On the Changes produced in Atmospheric Air 



and that at the close of the experiment the state of the lungs 

 was 141 + 67 — 208, still our approximation will come 

 within four or five cubic inches, for the azote contained in 

 the sixty-seven missing would be only about four cubic 

 inches. We are aware that the temperature of the lungs 

 being 97, while that of the gas was 53°, the 141 cubic 

 inches would occupy a space equal to 154 cubic inches ; but 

 this residual quantity must be greater or less according to the 

 exertion made, and also probably according to the state of 

 the muscular fibre at the time. 



Seventeenth Experiment. 



The water gasometer was filled to the usual mark upon the 

 scale, with oxygen gas, prepared from about 9 oz. troy, of 

 hyperoxygenized muriate of potash, as in the former experi- 

 ment ; the gas being examined was found to contain as be- 

 fore, 2 - 5 azote, and 97*5 oxygen, in 100 parts. 



The apparatus being found air-tight, and all the tubes, 8cc. 

 cleared of atmospheric air by passing oxygen through them, 

 the operator prepared himself for the experiment; but it 

 must be noticed that he had been rather fatigued during five 

 hours previous to respiring, and had not taken any refresh- 

 ment ; the weather was very warm ; his pulse 86 ; heat 

 under the' tongue 98-J- ; he felt no uncomfortable sensation 

 during the process, but experienced a gentle glow and uni- 

 versal perspiration, breathing all the time with great ease ; 

 his pulse after the experiment was 102, and the heat under 

 the tongue 99°. 



~, Cubic Inches , r , 



_, Therm. ►,-•_ c Cub. Inches t-. n . 



Barom. Fahr# lime. of oxygen gas exD ; red Deficiency. 



inspired. " 



30-3 70° 7' - 25" *3420 3362 .« 58. 



The quantities of expired gas taken off in each of the mer- 

 curial gasometers were as under, in the order in which they 

 were filled. 



No. 1. - - 250 cubic inches 



2. 290 



3. 272 



4. 238 



5. 252 



6. B 300 



7. 



