Galilei, Galileo, The systems of the world, 1661

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ſame terreſtrial evaporations, we finde a perpetual gale move
from the Eaſt with ſo conſtant a blaſt, that ſhips by favour
of ſail proſperouſly to the West-India's. And from the ſame
coaſting along the Mexican ſhore, they with the ſame felicity paſs
the Pacifick Ocean towards the India's; which to us are Eaſt, but

to them are Weſt.
Whereas on the contrary the Courſe from
thence towards the Eaſt is difficult and uncertain, and not to be
made by the ſame Rhumb, but muſt vere more to Land-ward, to
recover other Winds, which we may call accidentary and
tuary, produced from other Principles, as thoſe that inhabit the
continent find by experience.
Of which productions of Winds,
the Cauſes are many and different, which ſhall not at this time be

mentioned.
And theſe accidentary Winds are thoſe which blow
indifferently from all parts of the Eatth, and make rough the Seas
remote from the Equinoctial, and environed by the rugged
face of the Earth; which is as much as to ſay environ'd with
thoſe perturbations of Air, that confound that primary Gale.
The which, in caſe theſe accidental impediments were removed,
would be continually felt, and eſpecially upon the Sea.
Now
ſee how the effect of the Water and Air ſeem wonderfully to
cord with the Celeſtial obſervations, to confirm the mobility of
our Terreſtrial
The vaporous
parts of the earth,
partake of its
tions.
Conſtant gales
within the
pieks blow towards
the Weſt.
The courſe to the
Weſt-India's
ſie, the return
ficult.
Winds from Land
make rough the
Seas.
Another
tion taken from the
Air in
on of the motion of
the Earth.
SAGR. I alſo for a final cloſe will relate to you one particular,
which as I believe is unknown unto you, and which likewiſe may
ſerve to confirm the ſame concluſion: You Salviatus alledged,
That Accident which Sailers meet with between the Tropicks;
I mean that perpetual Gale of Winde that beats upon them from
the Eaſt, of which I have an account from thoſe that have many
times made the Voyage: And moreover (which is very
vable) I underſtand that the Mariners do not call it a Wind, but

by another ^{*} name, which I do not now remember, taken haply
from its ſo fixed and conſtant Tenor; which when they have met
with, they tie up their ſhrouds and other cordage belonging to
the Sails, and without any more need of touching them, though
they be in a ſleep, they can continue their courſe.
Now this conſtant
Trade-wind was known to be ſuch by its continual blowing
out interruptions; for if it were interrupted by other Windes, it
would not have been acknowledged for a ſingular Effect, and
different from the reſt: from which I wlll infer, That it may be
that alſo our Mediterranean Sea doth partake of the like accident;
but it is not obſerved, as being frequently altered by the
ence of other windes.
And this I ſay, not without good grounds,
yea upon very probable conjectures whch came unto my
ledge, from that which tendred it ſelf to my notice on occaſion of
the voyage that I made into Syria, going Conſul for this Nation

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