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

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1Points, the diviſible of indiviſibles, the quantitative of non-quan­
titative, is a rock very hard, in my judgment, to paſs over: And
the very admitting of Vacuity, ſo thorowly confuted by Ariſtotle,
no leſs puzleth me than thoſe difficulties themſelves.
SALV. There be, indeed, theſe and other difficulties; but re­
member, that we are amongſt Infinites, and Indiviſibles: thoſe in­
comprehenſible by our finite underſtanding for their Grandure;
and theſe for their minuteneſs: nevertheleſs we ſee that Humane
Diſcourſe will not be beat off from ruminating upon them, in
which regard, I alſo aſſuming ſome liberty, will produce ſome of
my conceits, if not neceſſarily concluding, yet for novelty ſake,
which is ever the meſſenger of ſome wonder: but perhaps the car­
rying you ſo far out of your way begun, may ſeem to you imper­
tinent, and conſequently little pleaſing.
SAGR. Pray you let us enjoy the benefit, and priviledge, of free
ſpeaking which is allowed to the living, and amongſt friends; eſpe­
cially, in things arbitrary, and not neceſſary; different from Diſcourſe
with dead Books, which ſtart us a thouſand doubts, and reſolve not
one of them.
Make us therefore partakers of thoſe Conſiderations,
which the courſe of our Conferences ſuggeſt unto you; for we
want no time, ſeeing we are diſengaged from urgent buſineſſes, to
continue and diſcuſſe the other things mentioned; and particular­
ly, the doubts, hinted by Simplicius, muſt by no means eſcape us.
SAIV. It ſhall be ſo, ſince it pleaſeth you: and beginning at
the firſt, which was, how it's poſſible to imagine that a ſingle Point
is equal to a Line; in regard I can do no more for the preſent, I
will attempt to ſatisfie, or, at leaſt, qualifie one improbability with
another like it, or greater; as ſome times a Wonder is ſwallowed
up in a Miracle.
And this ſhall be by ſhewing you two equal Su­
perficies, and at the ſame time two Bodies, likewiſe equal, and
placed upon thoſe Superficies as their Baſes; and that go (both
theſe and thoſe) continually and equally diminiſhing in the ſelf­

ſame time, and that in their remainders reſt alwaies equal between
themſelves, and (laſtly) that, as well Superſicies, as Solids, deter­
mine their perpetual precedent equalities, one of the Solids with
one of the Superficies in a very long Line; and the other Solid
with the other Superficies in a ſingle Point: that is, the latter in
one Point alone, the other in infinite.
The equal Super­
ficies of two Solids
continually ſub­
ſtracting from
them both equal
parts, are reduced,
the one into the
Circumference of a
Circle, and the o­
ther into a Point.
SAGR. An admirable propoſal, really, yet let us hear you ex­
plain and demonſtrate it.
SALV. It is neceſſary to give you it in Figure, becauſe the proof
is purely Geometrical.
Therefore ſuppoſe the Semicircle A F B,
and its Center to be C, and about it deſcribe the Rectangle
A D E B, and from the Center unto the Points D and E let there
be drawn the Lines C D, and C E; Then drawing the Semi-Dia­

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