Analyjis of the Air. 305 



commodes the lungs, yet it will not fuffbcate 

 like that of Charcoal, which is withal more 

 fulphureous, without any mixture of watry 

 vapours. 



And that new generated elaftick air is re- 

 forbed by thefe fumes, I found by attempting 

 to fire a Match of Brimftone with a burning- 

 glafs, by means of a pretty large piece of 

 Brown Paper, which had been dipped in a 

 flrong folution of Nitre, and then dried ; 

 which Nitre in detonizing generated near two 

 quarts of air; which quantity of air, and a 

 great deal more, was abforbed, when the 

 Brimftone took fire, and flamed vigoroufly. 



So that the 85 cubick inches of air, Exper. 

 96. which I found upon meafuring, was ab- 

 foibed by the Walton Mineral and compound 

 Aqua-fortis, was the excefs of what was ab- 

 forbed by thole fumes above what was gene- 

 rated by the fermenting mixture. 



And the reafon is the fame in Filings of 

 Iron, and Spirit of Nitre, Exper. 94. which 

 alio abforbed more than they generated, whe- 

 ther with or without water. 



Hence alio we fee the reafon why Filings 

 of Iron and compound Aqua-fortis y in the 

 fame 94th Experiment, abforbed air ; and why, 

 when mix\l with an equal quantity of water, 



X it 



