Analyfts of the Air. i6t 
niied pumping all the while, and the air 
pafTcd fo freely thro' the folds of cloth in- 
to the receiver, that the Mercury in the 
gage did not rife above an inch. 
When I put the other end of the fyphon 
into a hot iron pot, with burning Brimjtone 
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 fleams thro' the open fyphon, 
the light of the Candle was inflantly extin- 
guifhed ; 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 fo flrong as thefe 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, inflead of the 3 folds of cloth, I 
immerfed the end of the fyphon 3 inches 
deep in water in the veflel a;, ( Fig. 32.) tho* 
upon pumping the fulphureous fumes did 
afeend vifibly thro' the water, yet the Can- 
dle continued burning half a minute, i,e, dou- 
ble the time that it did when fumes pafled 
thro’ folds of woollen cloth, 
S 3 
