Analyfts of the Air. 2 6 3 
It is found by Experiments 103, 106, and 
107, that an air greatly charged with va- 
pours lofes much of its elafticity, which is 
the reafon why fubterraneous damps fuf- 
focate Animals, and extinguish the flame of 
Candles. And by Experiment 1 06, we fee 
that the fooner a Candle goes out, the fafl> 
er the air lofes its elafticity. 
Experiment CXV. 
This put me upon attempting to find fome 
means to qualify and rebate the deadly noxi- 
ous quality of thefe vapours : And in order 
to it, I put thro* the hole, in the top of the 
air pump receiver, (Fig. 32.) which con- 
tained two quarts, one leg of an iron fyphon 
made of a gun-barrel, which reached near 
to the bottom of the receiver: It was ce- 
mented faft at z y I tied three folds of woollen 
cloth over the orifice of the fyphon, which 
was in the receiver. The Candle went out 
in lefs than two minutes, tho’ I continued 
pumping all the while, and the air pafled fo 
freely thro" the folds of cloth into the re- 
ceiver, 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 Brimftone 
S 4 in 
