\g$ CHANGES PRODUCED IN AIB BY RESPIRATION. 



the experiment; but granting that this was not the case, 

 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 wa^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. 



menu 



eperator. 



17*. e«pen- ^j ie wa f. er <T agom eter was filled to the usual mark upon 

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

 hyperoxigenised muriate of potash, as in the former experi- 

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

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



The apparatus being found air tight, and all the tubes 

 &c. cleared of atmospheric air by passing oxigen 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 



Effects on the an y refreshment; the weather was very wana; his pulse 86; 

 heat under the tongue 98f; he felt no uncomfortable sensa- 

 tion daring the process, but experienced a gentle glow and 

 universal perspiration, breathing all the time with great 

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

 the tongue 99°. 



Cub. inches 

 Xesults. Barom. Therm. Time, of oxigen gas Cub, inches Deficiencj. 



Faht. • iuspired. expired. 



30-3 70° 725" 3420 3362 58. 



The quantities of expired gas taken off in each of the 

 mercurial gasometers were as under, in the order in which 

 they were filled. 



No. 



