Galilei, Galileo, The systems of the world, 1661

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1as one, that beſides your being born, and having, for a long
time, dwelt in Venice, where the Tides are very notable for their
greatneſſe, have alſo ſailed into Syria, and, as an ingenuous and
apprehenſive wit, muſt needs have made many Obſervations
on this ſubject: whereas I, that could onely for a time, and that
very ſhort, obſerve what happened in theſe extream parts of the
Adriatick Gulph, and in our Seas below about the Tyrrhene
ſhores, muſt needs take many things upon the relation of
thers, who, for the moſt part, not very well agreeing, and
ſequently being very uncertain, contribute more of confuſion
than confirmation to our ſpeculations.
Nevertheleſſe, from thoſe
that we are ſure of, and which are the principal, I think I am
ble to attain to the true and primary cauſes; not that I pretend
to be able to produce all the proper and adequate reaſons of
thoſe effects that are new unto me, and which conſequently I
could never have thought upon.
And that which I have to ſay,
I propoſe only, as a key that openeth the door to a path never
yet trodden by any, in certain hope, that ſome wits more
lative than mine, will make a further progreſſe herin, and
trate much farther than I ſhall have done in this my firſt
very: And although that in other Seas, remote from us, there may
happen ſeveral accidents, which do not happen in our
ranean Sea, yet doth not this invalidate the reaſon and cauſe that
I ſhall produce, if ſo be that it veriſie and fully reſolve the
cidents which evene in our Sea: for that in concluſion there can
be but one true and primary cauſe of the effects that are of the
ſame kind.
I will relate unto you, therefore, the effects that I
know to be true, and aſſigne the cauſes thereof that I think
to be true, and you alſo, Gentlemen, ſhall produce ſuch
others as are known to you, beſides mine, and then we will
try whether the cauſe, by me alledged, may ſatisfie them
alſo.
Three Periods
of ebbings and
flowings, diurnal,
monethly, and
nual.
I therefore affirm the periods that are obſerved in the fluxes
and refluxes of the Sea-waters to be three: the firſt and
pal is this great and moſt obvious one; namely, the diurnal,
ding to which the intervals of ſome hours with the waters flow and
ebbe; and theſe intervals are, for the moſt part, in the
rane from ſix hours to ſix hours, or thereabouts, that is, they for
ſix hours flow, and for ſix hours ebbe.
The ſecond period is
monethly, and it ſeemes to take its origen from the motion of
the Moon, not that it introduceth other motions, but only
tereth the greatneſſe of thoſe before mentioned, with a notable
difference, according as it ſhall wax or wane, or come to the
Quadrature with the Sun.
The third Period is annual, and is
ſeen to depend on the Sunne, and onely altereth the diurnal

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