584 



FOURTH REPORT — 1834. 



water was filled with air, by repeated blasts of a pair of hand 

 bellows, and into it were poured 480 gr. measures of lime-water 

 such as requires 460 gr. measures of test sulphuric acid, for neu- 

 tralization, the test acid being such that sulphuric acid of specific 

 gravity 1'135 constitutes x^o*^^ part of it: 520 gr. measures of 

 pure water were added. The mouth of the bottle was secured; 

 and the liquor, after being frequently and well agitated, (which 

 was done inmost instances daily for a week or more,) was passed 

 through a paper filter with the washings of the bottle ; it was 

 then found to be neutralized with only 270 gr. measures of 

 the -j-nn ^^^^ ^^^^ ' *^^^ being 190 gr. measures less than it 

 would have required previously to being put into the bottle. 



Now if 100 gr. measures of sulphuric acid, sp. gr. 1'135, is 

 equal to 17| grains by weight of real dry sulphuric acid, 190 gr. 

 measures of the ^^^ test acid is equal to 0'3325 of a grain by 

 weight of real sulphuric acid. And taking the atomic weight of 

 sulphuric acid at 35, and that of carbonic acid at 19*4, the 

 0*3325 of a grain of sulphuric acid is equal to 0*1813 of a grain 

 by weight of cai'bonic acid, or 0*3921 of a cvibic inch. 



And deducting 1000, the bulk of the liquor put into the bot- 

 tle, from 188400, the total capacity of the bottle, we have 187400, 

 the number of water grain measures of air operated upon, 

 = 742*3 cubic inches. 



Then 742*3 : 0*3921 : : 10,000 : 5*282. 



Therefore, in this instance, 10,000 volumes of air contained 

 5*282 volumes of carbonic acid. 



