1in the Tube fell down lower, about three
inches, at the top of the Mountain then
at the bottom. And a Learned Man a
while ſince inform'd me, That a great
Virtuoſo, friend to us both, has, with not
unlike ſucceſs, tryed the ſame Experi
ment in the lower and upper parts of a
Mountain in the Weſt of England: Of
which, the reaſon ſeems manifeſtly enough
to be this, That upon the tops of high
Mountains, the Air which bears againſt
the reſtagnant Quick-ſilver, is leſs preſſ'd
by the leſs ponderous incumbent Air; and
conſequently is not able totally to hinder
the deſcent of ſo tall and heavy a Cylin
der of Quick-ſilver, as at the bottom of
ſuch Mountains did but maintain an Æqui
librium with the incumbent Atmoſphere.
inches, at the top of the Mountain then
at the bottom. And a Learned Man a
while ſince inform'd me, That a great
Virtuoſo, friend to us both, has, with not
unlike ſucceſs, tryed the ſame Experi
ment in the lower and upper parts of a
Mountain in the Weſt of England: Of
which, the reaſon ſeems manifeſtly enough
to be this, That upon the tops of high
Mountains, the Air which bears againſt
the reſtagnant Quick-ſilver, is leſs preſſ'd
by the leſs ponderous incumbent Air; and
conſequently is not able totally to hinder
the deſcent of ſo tall and heavy a Cylin
der of Quick-ſilver, as at the bottom of
ſuch Mountains did but maintain an Æqui
librium with the incumbent Atmoſphere.
And if it be yet further Objected a
gainſt what hath been propoſ'd touching
the compactneſs and preſſure of the Infe
rior Air; That we finde this very Air to
yield readily to the motion of little Flies,
and even to that of Feathers, and ſuch o
ther light and weak Bodies; which ſeems
to argue, that the particles of our Air are
not ſo compreſſ'd as we have repreſented
them, eſpecially, ſince by our former
Experiment it appears, that the Air rea-
gainſt what hath been propoſ'd touching
the compactneſs and preſſure of the Infe
rior Air; That we finde this very Air to
yield readily to the motion of little Flies,
and even to that of Feathers, and ſuch o
ther light and weak Bodies; which ſeems
to argue, that the particles of our Air are
not ſo compreſſ'd as we have repreſented
them, eſpecially, ſince by our former
Experiment it appears, that the Air rea-