( tl* ) 
juft the fame in Summer as in Winter, and will fill a 
large Bladder in a few Seconds, by placing a Funnel 
at the Top of the Tube, with the fmallEnd of it put 
into the Neck of the Bladder, and kept clofe with one’s 
Hand. 
The faid Air being put into a Bladder, as is above 
defcribed, and tied clofe, may be carried away, and 
kept fome Days, and being afterwards preifed gently 
thro’ afmall Pipe into the Flame of a Candle, will take 
Fire, and burn at the End of thePipe as long as the Blad- 
der is gently preffed to feed the Flame, and when taken 
from the Candle, after it is fo lighted, it will continue 
burning ’till there is no more Air left in the Bladder 
to fupply the Flame. This fucceeded in May laft be- 
fore the Royal Society , after the Air had been con- 
fined in the Bladder for near a Month. 
The Air, when it comes out at the Top of the Tube, 
is as cold as Frofty Air. 
It is to be obferved that this fort of Vapour, or 
damp Air, will not take Fire except by Flame ; Sparks 
do not affeft it, and for that Reafon it is frequent 
to ufe Flint and Steel in Places affeded with this 
fort of Damp, which will give a glimmering Light,' 
that is a great Help to the Workmen in difficult 
Cafes. 
After the damp Air was carried up in a Tube, in the 
Manner above defcrib’d, the Pit was no more annoy’d 
with it, but was funk down very fuccefsfully througli 
the feveral Beds of Stone and Coal, without any other 
Accident, or Interruption, ’till it came to the main 
Seam of Coals, which is three Yards thick, and 79 
Fathom deep from the Surface j and the faid Pit be- 
ing Oval, as. ten Foot one way, and eight the other. 
