Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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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.
It is
ted inverting the
argument, that
the perpetual
tion of the Air
from Eaſt to Weſt
cometh from the
motion of Heaven?
It is demonſtrated
inverting the
gument, that the
perpetual motion of
the Air from Eaſt
to Weſt, cometh
from the motion of
Heaven.
The motion of the
Water dependeth
on the motion of
Heaven.
The flux and
flux may depend
on the diurual
tion of Heaven.
SALV. It cannot be denied, but that your diſcourſe is ingenious,
& hath much of probability, I mean probability in appearance, but
not in reality & exiſtence: It conſiſteth of two parts: In the firſt it

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