As much of the event as concerns our
preſent purpoſe, was this, That till a con
ſiderable part of the Air was drawn out
of the Receiver, the Tube continu'd top
full of Water as when it was put in, it be
ing requiſite that a great part of the Air
formerly contain'd in the Receiver, ſhould
be drawn out, to bring the remaining
Air to an Æquilibrium with ſo ſhort and
light a Cylinder of Water. But when
once the Water began to fall in the Tube,
then each exſuction of Air made it de
ſcend a little lower, though nothing near
ſo much as the Quick-ſilver at the begin
ning did in the Experiment formerly men
tion'd. Nor did there appear ſo much
inequality in the ſpaces tranſmitted by
the Water in its deſcent, as there did in
thoſe obſerv'd in the fall of the Quick
ſilver, of which the cauſe will ſcarce ſeem
abſtruſe to him that ſhall duly reflect up
on what has been already deliver'd. And
whereas we drew down the Quick-ſilver
in the Tube ſo far as to bring it within an
Inch of the ſurface of the other Quick
ſilver into which it was to fall; the loweſt
we were able to draw down the Water
was, by our conjecture, to about a Foot
preſent purpoſe, was this, That till a con
ſiderable part of the Air was drawn out
of the Receiver, the Tube continu'd top
full of Water as when it was put in, it be
ing requiſite that a great part of the Air
formerly contain'd in the Receiver, ſhould
be drawn out, to bring the remaining
Air to an Æquilibrium with ſo ſhort and
light a Cylinder of Water. But when
once the Water began to fall in the Tube,
then each exſuction of Air made it de
ſcend a little lower, though nothing near
ſo much as the Quick-ſilver at the begin
ning did in the Experiment formerly men
tion'd. Nor did there appear ſo much
inequality in the ſpaces tranſmitted by
the Water in its deſcent, as there did in
thoſe obſerv'd in the fall of the Quick
ſilver, of which the cauſe will ſcarce ſeem
abſtruſe to him that ſhall duly reflect up
on what has been already deliver'd. And
whereas we drew down the Quick-ſilver
in the Tube ſo far as to bring it within an
Inch of the ſurface of the other Quick
ſilver into which it was to fall; the loweſt
we were able to draw down the Water
was, by our conjecture, to about a Foot
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