1 immediately ſubſide in the ſmall Pipe.
And this would indeed infer, that it aſ-
cended before onely by the preſſure of
the incumbent Air: But that it may
(how juſtly I know not) be objected,
that preadventure this would not hap-
pen, in caſe the upper ende of the Pipe
were in a Vacuum: And that 'tis very
probable the Water may ſubſide, not
becauſe the preſſure of the internal Air
is taken off by Exſuction, but by reaſon
of the Spring of the external Air,
which impels the Water it findes in its
way to the Cavity deſerted by the
other Air, and would as well impell
the ſame Water upwards, as make it
ſubſide, if it were not now leiſure to exa-
mine any further this Matter, I ſhall
onely minde Your Lordſhip, that if
You will proſecute this Speculation,
it will be pertinent to finde out likewiſe,
Why the ſurface of Water /as is manifeſt
in Pipes) uſes to be concave, being de-
preſſ'd in the middle, and higher on eve-
ry side? and Why in Quick-ſilver on the
contrary, not onely the ſurface is wont
And this would indeed infer, that it aſ-
cended before onely by the preſſure of
the incumbent Air: But that it may
(how juſtly I know not) be objected,
that preadventure this would not hap-
pen, in caſe the upper ende of the Pipe
were in a Vacuum: And that 'tis very
probable the Water may ſubſide, not
becauſe the preſſure of the internal Air
is taken off by Exſuction, but by reaſon
of the Spring of the external Air,
which impels the Water it findes in its
way to the Cavity deſerted by the
other Air, and would as well impell
the ſame Water upwards, as make it
ſubſide, if it were not now leiſure to exa-
mine any further this Matter, I ſhall
onely minde Your Lordſhip, that if
You will proſecute this Speculation,
it will be pertinent to finde out likewiſe,
Why the ſurface of Water /as is manifeſt
in Pipes) uſes to be concave, being de-
preſſ'd in the middle, and higher on eve-
ry side? and Why in Quick-ſilver on the
contrary, not onely the ſurface is wont