Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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makes the objection, yea, it is totally overthrown by that which
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immediately after he addeth for a greater confirmation of his
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ment, as you ſhall hear. </
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>He re-inforceth his argument, I ſay, with
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another Axiome, which is this; That
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natura in rebus neceſſari is
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nec deficiat, nec abundat: i.e.
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That nature in things neceſſary is
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neither defective, nor ſuperfluous. </
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>This is obvious to the
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vers of natural things, and chiefly of animals, in which, becauſe
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they are to move with many motions, Nature hath made many
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flexures, and hath thereunto commodiouſly knitted the parts for
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motion, as to the knees, to the hips, for the inabling of living
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creatures to go, and run at their pleaſure. </
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>Moreover in man he
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hath framed many flexions, and joynts, in the elbow, and hand, to
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enable them to perform many motions. </
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>From theſe things the
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gument is taken againſt the threefold motion of the Earth. [
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ther the Body, that is one, and continuate, without any manner of
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knittings or flexions, can exerciſe divers motions, or cannot: If it
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can without them, then in vain hath nature framed the flexures in
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animals; which is contrary to the Axiome: but if it cannot
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out them, then the Earth, one body, and continuate, and deprived of
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flexures, and joynts, cannot of its own nature move with
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ty of motions.
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] You ſee now how craftily he falls upon your an
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ſwer, as if he had foreſeen it.</
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A fourth
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iome againſt the
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motion of the Earth
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Flexures
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ſary in animals for
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the diverſity of
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their motions.
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Another
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ment againſt the
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three fold motion of
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the Earth.
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<
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>SALV. </
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<
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>Are you ſerious, or do you jeſt?</
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<
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>SIMP. </
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>I ſpeak it with the beſt judgment I have.</
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<
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>SALV. </
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>You muſt therefore ſee that you have as fortunate an
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hand in defending the reply of this Philoſopher, againſt ſome
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ther rejoynders made to him; therefore anſwer for him, I pray
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you, ſeeing we cannot have him here. </
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>You firſt admit it for true,
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that Nature hath made the joynts, flexures, and knuckles of
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ving creatures, to the intent that they might move with ſnndry
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and divers motions; and I deny this propoſition; and ſay, that
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theſe flexions are made, that the animal may move one, or more
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of its parts, the reſt remaining immoved: and I ſay, that as to the
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ſpecies and differences of motions thoſe are of one kind alone, to
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wit, all circular, and for this cauſe you ſee all the ends of the
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veable bones to be convex or concave, and of theſe ſome are
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rical, as are thoſe that are to move every way, as in the
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joynt, the arme of the Enſigne doth, in diſplaying the Colours,
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and that of the Falconer in bringing his Hawk to the lure; and
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ſuch is the flexure of the elbow, upon which the hand turns round,
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in boring with an augure: others are circular onely one way, and
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as it were cylindrical, which ſerve for the members that bend
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ly in one faſhion, as the joynts of the fingers one above another,
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&c. </
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<
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>But without more particular inductions, one only general
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courſe may make this truth underſtood; and this is, that of a ſolid </
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