Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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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.
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

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