1it appears that a Cylinder of Mercury,
able to ballance a Cylinder of the whole
Atmoſphere, amounted to near about
thirty Inches; and ſince, conſequently
we may aſſume the proportion of Quick
ſilver to Air to be as fourteen thouſand to
one; it will follow, that a Cylinder of
Air, capable to maintain an Æquilibrium,
with a Mercurial Cylinder of two Foot
and an half in height, muſt amount to
35000 Feet of our Engliſh Meaſure;
and conſequently (reckoning five Foot
to a Geometrical Pace, and one thouſand
ſuch Paces to a Mile) to ſeven full
Miles.
able to ballance a Cylinder of the whole
Atmoſphere, amounted to near about
thirty Inches; and ſince, conſequently
we may aſſume the proportion of Quick
ſilver to Air to be as fourteen thouſand to
one; it will follow, that a Cylinder of
Air, capable to maintain an Æquilibrium,
with a Mercurial Cylinder of two Foot
and an half in height, muſt amount to
35000 Feet of our Engliſh Meaſure;
and conſequently (reckoning five Foot
to a Geometrical Pace, and one thouſand
ſuch Paces to a Mile) to ſeven full
Miles.
But this (as we lately intimated) pro
ceeds upon the ſuppoſition, that the Air
is every where of the ſame conſiſtence
that we found it near the ſurface of the
Earth; but that cannot with any ſafety
be concluded, not onely for the reaſon I
finde to have been taken notice of by the
Antients, and thus expreſt in Seneca:
Omnis Aër (ſays he) quo propior eſt terris
hoc craſsior; quemadmodum in aqua & in
omni humore fæx ima eſt, it a in Aëre ſpiſ
ſißima quæ〈qué〉 deſidunt; but much more,
becauſe the ſpringy Texture of the Aërial
Corpuſcles, makes them capable of a
ceeds upon the ſuppoſition, that the Air
is every where of the ſame conſiſtence
that we found it near the ſurface of the
Earth; but that cannot with any ſafety
be concluded, not onely for the reaſon I
finde to have been taken notice of by the
Antients, and thus expreſt in Seneca:
Omnis Aër (ſays he) quo propior eſt terris
hoc craſsior; quemadmodum in aqua & in
omni humore fæx ima eſt, it a in Aëre ſpiſ
ſißima quæ〈qué〉 deſidunt; but much more,
becauſe the ſpringy Texture of the Aërial
Corpuſcles, makes them capable of a
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