[ ] 
bient Preffure, forced forth the Cork, whereapon the 
Water, rulhing in with Violence, might break the 
Phial ; and therefore that this was the Caufe alfo of 
the Loudnefs of the Explofion j whereas the other 
being moftly filled with Water, there being but a 
fmall Quantity of Air therein, juft enough to- force 
out the Cork, the Phial was not broken, but was 
preferved by the Force of the Water inclofed therein. 
But I have had Reafon fince to change my Opinion ; 
for having had very ftrong Phials made, on Purpofc 
to make fome peculiar Experiments therewith, I 
took one of them, and having filled it about a quarter 
full with Water, and corked it very well, I let it in 
a fquare iron Frame, with a Screw to fcrew down 
the Cork, and keep it from flying forth. I then put 
it into aDigcfter, Four- fifths filled with Water} which 
being heated to a due Height, when 1 opened it, I 
found the Cork forced into the Phial, though the 
Cork was fo very large, that it amazed feveral who 
faw it, to conceive how it was poftiblc for fo large 
a Cork to be forced into the Bottle. Hence it mani- 
feftly appears, that the Preffure in the Digefter, where- 
in was proportionately more Water, and lefs Air, was 
ftronger than the Preffure within the Phial, wherein 
was proportionately more Air, and lefs Water. Then 
I reafon’d thus alfo of the two former Phials : That 
the Air in the Phial, wherein was no Water included, 
making not a proportionate Refiftance to the ambient 
Preffure in the Digefter, wherein was a confiderable 
Quantity of Water, the Cork was forced inward with 
fuch Violence, that it, together with the Water, 
dafhed the Phial in pieces } but that in the other 
Phial, wherein there were Five-fixths of Water, the 
inward 
