164 Anatyfis of the Air. 
in it; upon pumping, the Candle went out 
in 15 feconds of a minute; but when I took 
away the 3 folds of cloth, and drew the 
fulphureous fleams thro 5 the open fyphon, 
the light of the Candle was inftantly extim 
guiflied ; whence we fee the 3 folds of cloth 
preferred the Candle alight 15". And where 
the deadly quality of vapours in Mines is 
not fo ftrong as thefe fulphureous ones were, 
the drawing the breath thro 5 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, inftead of the 3 folds of cloth, I 
immerfed the end of the fyphon 3 inches 
deep in water in the velfel^XFig. 3 2.) tho* 
upon pumping the fulphureous fumes did 
afeend vifibly through the water, yet the 
Candle continued burning half a minute, 
i. e. double the time that it did when fumes 
palled thro' folds of woollen cloth. 
Experiment CXVL 
I bored a hole in the fide of a large wooden 
foffet a by (Fig. 39.) and glewed into it the 
great end of another folfet tty covering the 
orifice with a bladder valve r : Then I fit* 
te4 a yaive b to the orifice of the iron 
fyphon 
