C '^4 3 _ 
made of an inch Oak plank, broke it all in Pieces, 
and rebounded half way of the Room back again. 
What furprifed me in this Event was,, that the Noife 
it made at its burfting was by no means like the fuc-> 
celllve evaporating of an ^olipile, but like the 
firing off of Gunpowder. Nor could I perceive any- 
where in the Room the leaft Sign of Water, though I 
looked carefully for it, and, as I faid before, I had 
put a Pint into the Digefter, fave only that the Fire 
was quite extinguilhed, and every Coal belonging to 
it was black in an Inftant. 
But to confirm the Elafticity of Water, or to fhew, 
at leaft, that there is a much ftronger elaftic Force in 
Water and Air, when jointly included in a Veffel, 
than when Air alone is inclofed therein, 1 made the 
following Experiment : I took two 5vj Phials, into 
the one I put about of Water, or better, and 
fo corked it as well as I poflibly could j the other 
I corked in the fame Manner, without putting any 
thing into it. I inclofed them both in my new Di- 
gefter, Four-fifths being filled with Water? when the 
Heat was raifed to about Five-feconds, I heard a 
confiderable Explofion, and a jingling of Glafs within 
the Veffel, and fiiortly after another Explofion, but 
not fo loud as the former ; whence I concluded, that 
both the Phials were broken. I then let the Digefter 
cool leifurely, and the next Day I opened it; both 
the Corks were fwimming on the Top of the Water, 
but only one of the Phials was broken, that one 
into which I had not put any Water. At firft, indeed, 
1 concluded, that the Preffure or Dilatation of the 
Air in the empty Phial being ftronger than the am- 
bient 
