1various deſcents of the Quick-ſilver com
par'd among themſelves, 'tis not impro
bable that ſome ſuch thing as we hop'd for
may thereby be diſcover'd. Yet becauſe
not onely the ſolid contents of as much
of the Glaſs-tube as remains within the
concave ſurface of the Receiver, and
(which is more difficult) the varying con
tents of the Veſſel containing the Mer
cury, and of as much of the Mercury it
ſelf as is not in the Tube, muſt be dedu
cted out of the capacity of the Receiver;
but there muſt alſo an allowance be made
for this, that the Cylinder that is empty'd
by the drawing down of the Sucker, and
comes to be fill'd upon the letting of the
Air out of the Receiver into it, is not ſo
repleniſh'd with Air as the Receiver it ſelf
at firſt was: becauſe there paſſes no more
Air out of the Receiver into the Cylin
der, then is requiſite to reduce the Air in
the cavity of the Cylinder, and in that of
the Receiver to the ſame meaſure of dila
tation: Becauſe of theſe (I ſay) and ſome
other difficulties that require more skill in
Mathematicks then I pretend to, and much
more leaſure then my preſent occaſions
would allow me, I was willing to refer the
nicer conſideration of this matter to ſome
par'd among themſelves, 'tis not impro
bable that ſome ſuch thing as we hop'd for
may thereby be diſcover'd. Yet becauſe
not onely the ſolid contents of as much
of the Glaſs-tube as remains within the
concave ſurface of the Receiver, and
(which is more difficult) the varying con
tents of the Veſſel containing the Mer
cury, and of as much of the Mercury it
ſelf as is not in the Tube, muſt be dedu
cted out of the capacity of the Receiver;
but there muſt alſo an allowance be made
for this, that the Cylinder that is empty'd
by the drawing down of the Sucker, and
comes to be fill'd upon the letting of the
Air out of the Receiver into it, is not ſo
repleniſh'd with Air as the Receiver it ſelf
at firſt was: becauſe there paſſes no more
Air out of the Receiver into the Cylin
der, then is requiſite to reduce the Air in
the cavity of the Cylinder, and in that of
the Receiver to the ſame meaſure of dila
tation: Becauſe of theſe (I ſay) and ſome
other difficulties that require more skill in
Mathematicks then I pretend to, and much
more leaſure then my preſent occaſions
would allow me, I was willing to refer the
nicer conſideration of this matter to ſome
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