Jhalyjis of the Air. 



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niicd pumping nil the while, and the air 

 paflcd fo freely thro' the folds of cloth in- 

 to the receiver, that the Mercury in the 

 2 a?c did not rife above an inch. 



When I put the other end of the fyphon 

 into a hot iron pot, with burning Brimftone 

 in it; upon pumping, the Candle went out 

 in 1 5 feconds of a minute ; but when I took 

 away the 3 folds of cloth, and drew the 

 fulphureous (reams thro' the open fyphon, 

 the light of the Candle was inftantly extin- 

 guifhed 5 whence we fee the 3 folds of cloth, 

 preferved the Candle alight 1 5 ". And where 

 the deadly quality of vapours in Mines is 

 not foftrong asthefc fulphureous ones were, 

 the drawing the breath thro' many folds of 

 woollen cloth may be a means to preferve 

 life a little longer, in proportion to the more 

 or lefs noxious quality of the damps. 



When, inftcad of the 3 folds of cloth, I 

 immerfed the end of the fyphon 3 inches 

 deep in water in the velTel x, ( Tig. 32.) tho' 

 upon pumping the fulphureous fumes did 

 afcend vifibly thro' the water, yet the Can- 

 dle continued burning half a minute, i.e. dou- 

 ble the time that it did when fumes palled 

 thro' folds of woollen cloth. 



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