256 On the Changes produced in Atmospheric Air 

 air can come in contact with those parts of the lungs calcu- 

 lated to act upon it, the proportion of carbonic acid gas 

 given off in natural respiration, ought probably to stand' 

 considerably lower than in the above estimate $ but at all 

 events it will be very considerable. < 



Sixfeenih Experimen.t. 



Having made so many experiments upon atmospheric air, 

 we now proceeded to ascertain the effects produced upon 

 oxygen gas by the process of respiration:. The water gaso- 

 meter was filled with oxygen gas made from the hyperoxy- 

 geni'zed muriate of potash by heat, care having been taken 

 to clear all the tubes, Sec. as much as possible of commoa 

 air, by forcing a quantity'of oxygen gas through' them. 



One hundred parts from the water gasometer being treated 

 with the usual tests in the eudiometer, a residuiwm of only 

 5*5 was left ■ so that <j?/5 per cent." were pure oxygen, and 

 the rest azote. 



The register of the.water apparatus being noticed, and the 

 operator having prepared himself as usual by a forced expi- 

 ration, began to rcs.pire; his pulse was 72; and at the end 

 of nine minutes and twenty seconds, the experiment was 

 concluded by a forced expiration, when the pulse was raised 



to 88. 



t» Cubic Indies ~ , T , 



„ T.herm. — , , ' C 11 h. Inches ~ <• • _, 



Ifarom. -r , iJine. of oxygen gas . , Deficiency'. 



Fahr-. . ■'p , & expired. J 



?nsp;rea. r 



Q9'5 53° 0/-20" 3260 3 1 03 6*7 



The operator felt a general glow over the body to the very 

 extremities, with a gentle persphation ; this however went 

 off in a few minutes, and no remarkable deviation from the 

 ordinary state wasi experienced. 



A portion having been saved, as usual, from each of the; 

 mercurial gasometers, for an average, 

 100 parts contained 



1} carbonic acid, 

 83 oxygen, 

 6 azote. 



100 



The examination repeated^ gave the same results. 



CuUulati&fi 



