Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1riodick courſe of the ſaid ſpots, yet did they not alter the
on
of our friend, ſo as to make him believe, that they were any
eſſential
and fixed cauſe of thoſe deviations, but he continued to
hold
, that all the apparent alterations derived themſelves from
thoſe
accidental mutations: in like manner, juſt as it would
pen
to one that ſhould from far diſtant Regions obſerve the
tion
of our Clouds; which would be diſcovered to move with a
moſt
ſwift, great, and conſtant motion, carried round by the
urnal
Vertigo of the Earth (if haply that motion belong to the
ſame
) in twenty four hours, by circles parallel to the
al
, but yet altered, in part, by the accidental motions cauſed by
the
winds, which drive them, at all adventures, towards different
quarters
of the World.
While this was in agitation, it came to
paſs
that Velſerus ſent him two Letters, written by a certain

ſon
, under the feigned name of ^{*} Apelles, upon the ſubject of
theſe
Spots, requeſting him, with importunity, to declare his
thoughts
freely upon thoſe Letters, and withall to let him know
what
his opinion was touching the eſſence of thoſe ſpots; which his
requeſt
he ſatisfied in 3 Letters, ſhewing firſt of all howvain the
conjectures
of Apelles were; & diſcovering, ſecondly, his own
nions
; withal foretelling to him, that Apelles would undoubtedly
be
better adviſed in time, and turn to his opinion, as it afterwards
came
to paſs.
And becauſe that our Academian (as it was alſo
the
judgment of many others that were intelligent in Natures
crets
) thought he had in thoſe three Letters inveſtigated and
monſtrated
, if not all that could be deſired, or required by
mane
curioſity, at leaſt all that could be attained by humane
reaſon
in ſuch a matter, he, for ſome time (being buſied in other
ſtudies
) intermitted his continual obſervations, and onely in
placency
to ſome friend, joyned with him, in making now and
then
an abrupt obſervation: till that he, and after ſome years,

we
, being then at my ^{*} Country-ſeat, met with one of the
ry
Solar ſpots very big, and thick, invited withal by a clear and
conſtant
ſerenity of the Heavens, he, at my requeſt, made
vations
of the whole progreſſe of the ſaid ſpot, carefully marking
upon
a ſheet of paper the places that it was in every day at the
time
of the Suns coming into the Meridian; and we having found
that
its courſe was not in a right line, but ſomewhat incurvated,
we
came to reſolve, at laſt, to make other obſervations from time
to
time; to which undertaking we were ſtrongly induced by a
conceit
, that accidentally came into the minde of my Gueſt,
which
he imparted to me in theſe or the like words.
* Duumviro.
* This Authors
true
name is
ſtopher
Scheiner us
a
Jeſuit, and his
Book
here meant
is
intituled,
les
poſt tabulam.
* La mia villa
delle
Selue.

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