Galilei, Galileo, The systems of the world, 1661

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He that will
low
Copernicus,
must deny his
ſes
.
SALV. So that the inſtance of this Philoſopher lays its ſtreſs
on
this, that whether the principle by which we move round with
the
Earth be either extern, or intern, yet however we muſt
ceive
it, and not perceiving it, it is neither the one nor the other,
and
therefore we move not, nor conſequently the Earth.
Now I

ſay
, that it may be both ways, and yet we not perceive the ſame.
And that it may be external, the experiment of the boat
bundantly
ſatisſieth me; I ſay, ſuperabundantly, becauſe it being
in
our power at all times to make it move, and alſo to make it
ſtand
ſtill, and with great exactneſs to make obſervation, whether
by
ſome diverſity that may be comprehended by the ſenſe of
ing
, we can come to know whether it moveth or no, ſeeing that
as
yet no ſuch ſcience is obtained: Will it then be any matter of
wonder
, if the ſame accident is unknown to us on the Earth, the
which
may have carried us about perpetually, and we, without our

being
ever able to experiment its reſt?
You, Simplicius, as I
lieve
, have gone by boat many times to Padoua, and if you will
confeſs
the truth, you never felt in your ſelf the participation of
that
motion, unleſs when the boat running a-ground, or
tring
ſome obſtacle, did ſtop, and that you with the other
gers
being taken on a ſudden, were with danger over-ſet.
It
would
be neceſſary that the Terreſtrial Globe ſhould meet with
ſome
rub that might arreſt it, for I aſſure you, that then you
would
diſcern the impulſe reſiding in you, when it ſhould toſs you
up
towards the Stars.
It's true, that by the other ſenſes, but yet

aſſiſted
by Reaſon, you may perceive the motion of the boat, that
is
, with the ſight, in that you ſee the trees and buildings placed on
the
ſhoar, which being ſeparated from the boat, ſeem to move the

contrary
way.
But if you would by ſuch an experiment receive
intire
ſatisfaction in this buſineſs of the Terreſtrial motion, look
on
the ſtars, which upon this reaſon ſeem to move the contrary
way
.
As to the wondering that we ſhould not feel ſuch a
ciple
, ſuppoſing it to be internal, is a leſs reaſonable conceit; for
if
we do not feel ſuch a one, that cometh to us from without,
and
that frequently goeth away, with what reaſon can we expect
to
feel it, if it immutably and continually reſides in us?
Now let
us
ſee what you have farther to allege on this argument.
SIMP. Take this ſhort exclamation. Ex hac itaque opinione
neceſſe
est diffidere noſtris ſenſibus, ut penitùs fall acibus vel ſtupidis
in
ſenſilibus, etiam conjunctiſſimis, dijudicandis.
Quam ergò
ritatem
ſperare poſſumus à facultate adeò fallaci ortum trabentem?
[Which I render thus:] From this opinion likewiſe, we muſt of

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