1being manifeſtly ſo dilated as to expel a
good part of the Water, but not ſo much
as to break quite thorow. And at length,
when our expectation of it was almoſt ti
red out, the heavier of the two Viols be
gan to come aloft, and immediately to
ſubſide again, which appear'd to be oc
caſion'd by the Air within it, whoſe bulk
and ſpring being weaken'd by the receſs
of the forty bubbles before-mention'd, it
was no longer able, as formerly, to break
forcibly through the incumbent Water;
but forming a bubble at the mouth of the
Glaſs, boyed it up towards the top, and
there getting away, left it to ſink again
till the preſſure of the Air in the Recei
ver being further taken off, the Air in the
Viol was permitted to expand it ſelf fur
ther, and to create another bubble, by
which it was again for a while carried up.
And it was remarkable, that though after
having emptyed the Receiver as far as
well we could, we ceaſ'd from pumping;
yet the Veſſel continuing more ſtanch
then it was wont, this aſcent and fall of
the Viol was repeated to the ninth time;
the included Air, by reaſon of the ſmal
neſs of the vent at which it muſt paſs out,
being not able to get away otherwiſe then
good part of the Water, but not ſo much
as to break quite thorow. And at length,
when our expectation of it was almoſt ti
red out, the heavier of the two Viols be
gan to come aloft, and immediately to
ſubſide again, which appear'd to be oc
caſion'd by the Air within it, whoſe bulk
and ſpring being weaken'd by the receſs
of the forty bubbles before-mention'd, it
was no longer able, as formerly, to break
forcibly through the incumbent Water;
but forming a bubble at the mouth of the
Glaſs, boyed it up towards the top, and
there getting away, left it to ſink again
till the preſſure of the Air in the Recei
ver being further taken off, the Air in the
Viol was permitted to expand it ſelf fur
ther, and to create another bubble, by
which it was again for a while carried up.
And it was remarkable, that though after
having emptyed the Receiver as far as
well we could, we ceaſ'd from pumping;
yet the Veſſel continuing more ſtanch
then it was wont, this aſcent and fall of
the Viol was repeated to the ninth time;
the included Air, by reaſon of the ſmal
neſs of the vent at which it muſt paſs out,
being not able to get away otherwiſe then
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