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.
But now, this Motion of theirs cannot
be cauſed by the Heavens;
and therefore it
muſt neceſſarily proceed from the Revoluti-
on of our Earth.
That the Moon's Orb cannot carry along
with it the greater part of the Air wherein
theſe Comets are placed, might eaſily be
proved from the common Grounds.
For
the Concave Superficies of that Sphere, is
uſually ſuppoſed to be exactly terſe and
ſmooth;
ſo that the meer touch of it can-
not turn about the whole Element of Fire,
with a Motion that is not natural unto it.
Nor could this Elementary Fire, which they
imagine to be of a more rarified and ſubtil
Nature, communicate the ſame Motion to
the thicker Air, and that to the Waters (as
ſome affirm):
For by what means could
that ſmooth Orb take hold of the adjoining
Air ?
To this Sarſius anſwers, that there are
great Gibboſities, and mountainous Inequa-
lities, in the Concavity of the loweſt Sphere,
and by theſe is it enabled to carry along
with it the Fire and Air.
But FromondusAntariſt.
cap 16.
tells him, Fictitia iſta, &
ad fugam reperta
ſunt.
And yet his own Conjecture is ſcarce
ſo good, when he affirms, that this Motion
of the Ætherial Air, as alſo of that Ele-
mentary Air hard by us, is cauſed by that
ruggedneſs which there is in the Bodies of
the Planets;
of which Opinion, we may,
with as good reaſon, ſay as he ſays to
Sarſius:
Fictitia iſta, & ad fugam reperta;
Theſe things are meer Fictions, inven-

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