and Oxygen Gas by Respiration, $53 



100 parts contained 10 carbonic acid, 

 4 oxygen. 

 86 azote. 



100 



In this experiment it is remarkable, that the air which had- 

 been so often through the lung = 5 should only have furnished 

 iO per cent, of carbonic acid, while the air which passes them 

 but once contains from 8 to 8*5- 



Here the oxygen had lost 7 from 21, and the azote had 

 gained 7 upon 79. 



We knew by previous experiment*, that every cubic inch 

 of carbonic acid gas required exactly a cubic inch of oxygeii 

 for its formation ; the ten parts of carbonic acid may therefore 

 be reckoned as' oxygen, which would make the constitution of 



a e/ u ■ f 14 oxygen 



the gas alter the experiment 



S6 azote. 



whereas before the experiment it was < _„ ' /& ' • 

 * j^79 azote. 



Now we did not suppose the residuum of 86 to be all 

 azote, though 79 might be ; therefore seven parts appeared 

 to have been added by this unnatural mode of respiring, 

 and we conjectured the addition might be gaseous oxide of 

 carbon, 



To ascertain this, we put 40 parts into a flint stopper, 

 bottle, and nearly filled it with about 100 parts hyperox- 

 ygenized muriatic acid, procured as before, and recently pre- 

 pared; the stopper being put in, over distilled wafer, we 

 plunged it in quicksilver, and filled a second bottle in the 

 same way, as a comparative experiment. 



We next procured some pure azote, by absorbing the oxy- 

 gen from a portion of atmospheric air by the saturated green 

 sulphate and simple green sulphate as usual ; 40 parts of this 

 azote were mixed with the same proportion of the acid gas 

 as in the other experiment, and the whole suffered to stand 

 for forty-eight hours) at the end of this time the azote was 

 examined, by washing it first in distilled wateryand after- 



■V- See the experiments on carbonic acid in the Society's Transactions, 



wards 



