i6o Analyfis of the Air. 
Which fleams have doubtlefs the fame 
efFeft on the air, in the lungs of Animals 
held over them j as in the Grotto di earth 
or when a clofe room is filled with them, 
where they certainly fufFocate. 
It is found by Experiments 103, 106, 
and 107, that an air greatly charged with 
vapours lofes much of its elaflicity, which 
is the reafon why fubterraneous damps fuf- 
focate Animals, and extinguilh the flame of 
Candles. And by Experiment 106, we fee 
that the fooner a Candle ^oes out, the faft- 
cr the air lofes its elaflicity. 
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 fafl at Zy I tyed three folds of wool- 
len cloth over the orifice of the fyphon, 
which was in the receiver. The Candle went 
out in lels than two riiinutes, tho* I conti- 
4 nued 
