Wilkins, John, A discovery of a new world : or a discourse tending to prove, that 'tis probable there may be another Habitable World in the Moon ; with a discourse concerning the Probability of a Passage thither; unto which is added, a discourse concerning a New Planet, tending to prove, that 'tis probable our earth is one of the Planets

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That the Earth may be a Planet.
on, Variation, Declination; the two laſt of
which are found to be indifferent, according
to the variety of places.
Now this diffe-
rence cannot proceed from the Needle it
ſelf, becauſe that is the ſame every where.
Nor can we well conceive how it ſhould be
cauſed by the Heavens;
for then the Varia-
tion would not be always alike in the ſame
place, but diverſe, according to thoſe ſeve-
ral parts of the Heaven, which at ſeveral
times ſhould happen to be over it:
And
therefore it muſt neceſſarily proceed from
the Earth, which being it ſelf endowed with
Magnetical Affections, does diverſly diſpoſe
the Motions of the Needle, according to the
diſſerence of that diſponent virtue, which is
in its ſeveral Parts.
Now, to apply this unto the particular
Inſtances of the Objection:
We ſay, though
ſome parts of this great Magnet, the Earth,
may, according to their Matter, be ſevered
from the whole;
yet are they always joined
to it, by a communion of the ſame Magne-
tical Qualities;
and do no leſs obſerve theſe
kind of Motions, when they are ſeparated
from the whole, than if they were united
to it.
Nor need this ſeem incredible, that
a heavy Bullet, in ſuch a ſwift violent courſe,
ſhould be able to obſerve this Magnetical
Revolution of the whole Earth;
when as
we ſee that thoſe great Bodies of Saturn,
Jupiter, &
c. hanging in the vaſt ſpaces of
the Ætherial Air, do ſo conſtantly and re-
gularly move on in their appointed courſes.

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