Galilei, Galileo
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The systems of the world
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1661
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and ſport with our Fancies) hath, I ſay, hath permitted that the
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motions for every other reſpect, except to reſolve the ebbing and
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flowing of the Sea, aſſigned long ſince to the earth, ſhould be found
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now at laſt to anſwer exactly to the cauſe thereof; and, as it
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were, with mutual a emulation, the ſaid ebbing and flowing
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to appear in confirmation of the Terreſtrial motion: the
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judices
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whereof have hitherto been taken from the cœleſtial Phænomena,
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in regard that of thoſe things that happen on Earth, not any one
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was of force to prove one opinion more than another, as we
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ready have at large proved, by ſhewing that all the terrene
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rences upon which the ſtability of the Earth and mobility of the
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Sun and Firmament is commonly inferred, are to ſeem to us
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formed in the ſame manner, though we ſuppoſed the mobility of
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the Earth, and the immobility of them. </
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>The Element of
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ter onely, as being moſt vaſt, and which is not annexed and
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catenated to the Terreſtrial Globe as all its other ſolid parts are;
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yea, rather which by reaſon of its fluidity remaineth apart
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ſui
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juris,
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and free, is to be ranked amongſt thoſe ſublunary things,
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from which we may collect ſome hinte and intimation of what the
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Earth doth in relation to motion and reſt. </
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>After I had many
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and many a time examined with my ſelf the effects and accidents,
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partly ſeen and partly underſtood from others, thar are to be
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ſerved in the motions of waters: and moreover read and heard
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the great vanities produced by many, as the cauſes of thoſe
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dents, I have been induced upon no ſlight reaſons to omit theſe
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two concluſions (having made withal the neceſſary
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ſals) that in caſe the terreſtrial Globe be immoveable, the flux
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and reflux of the Sea cannot be natural; and that, in caſe thoſe
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motions be conferred upon the ſaid Globe, which have been long
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ſince aſſigned to it, it is neceſſary that the Sea be ſubject to
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bing and flowing, according to all that which we obſerve to
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pen in the ſame.</
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Nature in ſport
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maketh the ebbing
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and flowing of the
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Sea, to approve the
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Earths mobility.
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The tide, and
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mobility of the
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Earth mutually
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confirm each other
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All terrene
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fects, indifferently
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confirm the motion
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or reſt of the
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Earth, except the
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ebbing and flowing
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of the Sea.
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The firſt
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ral concluſion of
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the impoſſibility of
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the ebbing and
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flowing the
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bility of the
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ſtrial Globe being
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granted.
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<
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>SAGR. </
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>The Propoſition is very conſiderable, as well for it
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ſelf as for what followeth upon the ſame by way of conſequence,
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ſo that I ſhall the more intenſly hearken to the explanation and
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confirmation of
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The knowledge
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of the offests
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tributes to the
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veſtigation of the
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cauſes.
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<
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>SALV. </
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>Becauſe in natural queſtions, of which number this
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which we have in hand is one, the knowledge of the effects is a
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means to guide us to the inveſtigation and diſcovery of the
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ſes, and without which we ſhould walk in the dark, nay with
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more uncertainty, for that we know not whither we would go,
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whereas the blind, at leaſt, know where they deſire to arrive;
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fore firſt of all it is neceſſary to know the effects whereof we
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quire the cauſes: of which effects you,
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Sagredus,
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ought more
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abundantly and more certainly to be informed than I am, </
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