Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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and therefore they alſo, as being round, muſt be alſo
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tible; and likewife in the remainders, which environ theſe eight
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leſſer Spheres, a man may underſtand that there are others: ſo
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that in the end, reſolving the whole
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Die
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into innumerable balls,
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it muſt neceſſarily be granted incorruptible. </
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<
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>And the ſame
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courſe and reſolution may be made in all other figures.</
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If the ſpherical
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gure conferreth
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ternity, all bodies
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would be eternal.
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<
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>SALV. </
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>Your method in making the concluſion, for if
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v. </
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>g.
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a
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round Chryſtal were, by reaſon of its figure, incorruptible; namely,
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received from thence a faculy of reſiſting all internal and external
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alterations, we ſhould not find, that the joyning to it other
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ſtal, and reducing it
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v. </
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<
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>g.
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into a Cube, would any whit alter it
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within, or without; ſo as that it would thereupon become leſſe
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apt to reſiſt the new ambient, made of the ſame matter, than it
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was to reſiſt the other, of a matter different; and eſpecially, if
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it be true, that corruption is generated by contraries, as
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ſtotle
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ſaith; and with what can you encloſe that ball of Cryſtal,
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that is leſſe contrary to it, than Cryſtal it ſelf? </
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>But we are not
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ware how time flies away; and it will be too late before we come
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to an end of our diſpute, if we ſhould make ſo long diſcourſes,
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upon every particular; beſides our memories are ſo confounded
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in the multiplicity of notions, that I can very hardly recal to
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mind the Propotſiions, which I propoſed in order to
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Simplicius,
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for our conſideration.</
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>SIMPL. </
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>I very well remember them: And as to this particular
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queſtion of the montuoſity of the Moon, there yet remains
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anſwered that which I have alledged, as the cauſe, (and which
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may very well ſerve for a ſolution) of that
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Phænomenon,
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ſaying,
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that it is an illuſion proceeding from the parts of the Moon,
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ing unequally opacous, and perſpicuous.</
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<
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>SAGR. </
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>Even now, when
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Simplicius
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aſcribed the apparent
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tnberancies or unevenneſſes of the Moon (according to the opinion
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of a certain
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Peripatetick
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his friend) to the diverſly opacous, and
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perſpicuous parts of the ſaid Moon, conformable to which the like
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illuſions are ſeen in Cryſtal, and Jems of divers kinds, I bethought
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my ſelf of a matter much more commodious for the repreſenting
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ſuch effects; which is ſuch, that I verily believe, that that
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pher would give any price for it; and it is the mother of Pearl, which
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is wrought into divers figures, and though it be brought to an
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treme evenneſſe, yet it ſeemeth to the eye in ſeveral parts, ſo
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ouſly hollow and knotty, that we can ſcarce credit our feeling of
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their evenneſſe.</
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Mother of Pearl
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accommodated to
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imitate the
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rent unevenneſſes
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of the Moons
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face.
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<
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>SALV. </
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<
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>This invention is truly ingenious; and that which hath
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not been done already, may be done in time to come; and if
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there have been produced other Jems, and Cryſtals, which have
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nothing to do with the illuſions of the mother of Pearl, theſe may </
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