274 Messrs. Allen and Pepys on the Changes produced in 
The 13th or last gasometer was now examined by itself ; 
100 parts contained 12.5 carbonic acid, 
5.5 azote, 
82. oxygen. 
100 
Here the proportion of azote was only 3 per cent, more than 
what existed previously in the gas, and hence we may con- 
clude, that even seven minutes and a half was not a sufficient 
time to remove the azote from the extremities of the bronchia. 
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 : 22.30 Carbonic acid gas in No. 1. 22.50 
100 : 12.5 : : 186 : 21 ditto No. 13. 21 
From 3362 total expired 
250 No. 1. 
168 No. 13 
Deduct 418 
Leaves the mixture 2344 of No 2. to No. 12. 
o Carb. acid eras in mixture c 
100 : 12 : : 2944 : 353-28 6 353-28 
2. to 12. ___ 
39 6 -7 s 
