CHAXOft PRODUCED I* AIR BY RESPIRATION* 1 g5 



iOO parts of the expired gas therefore consisted of 



8' 5 carbonic acid. 

 12*5 oxigen 

 79* azote. 



100. 



The air contained in the water gasometer, previous to the and of the air 

 [periment, 

 100 parts of 



experiment, being examined by the same tests, consisted in j^l"^- t0 re " 



21 oxigen 

 79 azote. 



100. 



In trying common atmospheric air with Hmewater, we No carbons 

 could never find any quantity of carbonic acid perceptible *c<d percepti- 

 in the eudiometer of 100 parts. We m common 



Calculation for Carbonic Acid, ac fce , . 



J 26-55 cubic 



inches of curb. 

 100 : 8-5 : : 3437 : 292*145. acid gas give* 



~, . ' . v '*; /»i««i .off every mi- 



So that 292*14 cubic inches ot carbonic acid gas were given nute. 



off in eleven minutes, or 26*55 cubic inches per minute, 

 which is almost exactly the estimate of professor Davy. 



Jn this experiment the operator inspired 3460 cubic ie| cubic 

 inches in eleven minutes, aud felt himself in a natural state inches taken i* 

 when he left off. Then, as he makes usually under common tpirationf "* 



circumstances nineteen respirations in a minute. 



■ » 



11 X 19 = 209 *H| = 16*5 



\\ follows, that he takes in \§\ cubic inches at every easy in* 

 spi ration. 



As all the experiments had been hitherto made upon the 

 lungs of one person, we concluded, that the next should be 

 performed upon our assistant. 



Twelfth Experiment. 



Here, 



