Galilei, Galileo, The systems of the world, 1661

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1
the
Aire which partaketh of that motion to diſtend ſo low as to
the
Tops of the higheſt Hills, and that likewiſe they would reach
to
the Earth, if thoſe Mountains did not impede them, which
agreeth
with what you ſay: For as you affirm, the Air, which is
invironed
by ledges of Mountains, to be carried about by the
aſperity
of the moveable Earth; we on the contrary ſay, That
the
whole Element of Air is carried about by the motion of
Heaven
, that part only excepted which lyeth below thoſe bodies,
which
is hindred by the aſperity of the immoveable Earth.
And
whereas
you ſaid, That in caſe that aſperity ſhould be removed,
the
Air would alſo ceaſe to be whirld about; we may ſay,
That
the ſaid aſperity being removed, the whole Aire would
tinue
its motion.
Whereupon, becauſe the ſurfaces of ſpacious
Seas
are ſmooth, and even; the Airs motion ſhall continue upon
thoſe
, alwaies blowing from the Eaſt: And this is more ſenſibly
perceived
in Climates lying under the Line, and within the
picks
, where the motion of Heaven is ſwifter; and like as that
Celeſtial
motion is able to bear before it all the Air that is at
liberty
, ſo we may very rationally affirm that it contributeth the
ſame
motion to the Water moveable, as being fluid and not
nected
to the immobility of the Earth: And with ſo much the

more
confidence may we affirm the ſame, in that by your
feſſion
, that motion ought to be very ſmall in reſect of the efficient
Cauſe
; which begirting in a natural day the whole Terreſtrial
Globe
, paſſeth many hundreds of miles an hour, and eſpecially
towards
the Equinoctial; whereas in the currents of the open Sea,
it
moveth but very few miles an hour.
And thus the voiages
wards
the Weſt ſhall come to be commodious and expeditious,
not
onely by reaſon of the perpetual Eaſtern Gale, but of the
courſe
alſo of the Waters; from which courſe alſo perhaps the
Ebbing
and Flowing may come, by reaſon of the different

ation
of the Terreſtrial Shores: againſt which the Water coming
to
beat, may alſo return backwards with a contrary motion, like
as
experience ſheweth us in the courſe of Rivers; for according as
the
Water in the unevenneſs of the Banks, meeteth with ſome
parts
that ſtand out, or make with their Meanders ſome Reach or
Bay
, here the Water turneth again, and is ſeen to retreat back
a
conſiderable ſpace.
Upon this I hold, That of thoſe effects
from
which you argue the Earths mobility, and alledge it as a
cauſe
of them, there may be aſſigned a cauſe ſufficiently valid,
retaining
the Earth ſtedfaſt, and reſtoring the mobility of
Heaven
.

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