262 On the Changes produced in Atmospheric Air 



We lastly made a mixture of all the gasometers, from 2 to 

 12 inclusive, and found that 100 parts contained 

 12 carbonic acid, 

 6'5 azote, 

 ,81*5 oxygen. 



100 



Calculation for Carbonic Acid. 

 100 : 9 :: 250 : 22-50 Carbonic acid gas in No. 1. 22-50 

 100 : 12-5 : : 186 : 21 ditto No, 13. $1 



From 3362 total expired 



250 No. l. 

 168 No. 13. 



Deduct 418 



Leaves the mixture 2914 of No. 2, to No. 12. 



-.™ -ir. nn *A o t ~ -.o Carb.acixl cjas in mixture or „ „_ 

 300 : 12 : : 2944 : 353'28 ° 353'28 



2. to 12. 



396-78 



The total quantity of carbonic acid gas emitted, was there- 

 fore 396*78 cubic inches. 



Calculation for Azote, 

 100 : 2-5 :: 250 : 62-50 Azote in No. 1. 62*50 



100:5-5:: 168: 9'24 — in No. 13. 9-24 



100 : 6-5 ;: 2944 : lyi'36 inmixt. 2. to 12. 191*36 



263-10 



The azote expired, beside v\4iat might be contained in the 

 lungs, at the close of the experiment, was therefore 263-10 

 cubic inches. Here it is plain, that the operator, at the be- 

 ginning of this experiment, had not brought his lungs to the 

 same state as in the preceding; or that in consequence of 

 fatigue, and want of refreshment for several hours, the pro- 

 portion of azote in the lungs might be greater. 



Every 100 parts of oxygen, before it was inspired, con- 

 tained 2-5 azote. 



100 



