( 2-8i ) 
IV. An Experiment to [hew that fome 
Damps in Mines may he occafioned 
only by the burning of Candles under 
Ground, without the Addition of any 
noxious Vapour, even when the Bot- 
tom of the Tit has a Communication 
with the outward Air, unlef the Out- 
ward Air he forcibly driven in at the 
[aid Communication or Tipe. By 
the Reverend]. T. Defaguliers, LLD. 
F. R. S. 
Experiment I. 
I N a Cylindric Glafs-Receiver, open at both Ends, 
whofe lower End is plung’d in Water, and up- 
per End cover’d with a Plate with an Hole of near 
an Inch Bore, a Candle of Six in the Pound will 
not burn quite the Time of one Minute before it 
goes out. 
Experiment II. 
A Candle will burn almoft as long when the 
Receiver is quite cover’d. 
Experiment III. 
The Receiver having the Hole of the Plate open, 
and a Pipe at Bottom communicating with the ex- 
ternal 
