Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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conſiſteth the original cauſe of the irregular motion of the
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ſels, and conſequently of the Ebbing and Flowing: inſomuch
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that if theſe additions and ſubſtractions ſhould alwayes proceed
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in the ſame proportion, in reſpect of the Annual motion, the
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cauſe of the Ebbing and Flowing would indeed continue, but
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yet ſo as that they would perpetually return in the ſelf ſame
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ner: But we are to finde out the cauſe of making the ſame
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bings and Flowings in divers times greater and leſſer:
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fore we muſt (if we will retain the identity of the cauſe) find the
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alteration in theſe additions and ſubſtractions, that make them
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more & leſs potent, in producing thoſe effects which depend
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upon. </
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<
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>But I ſee not how that potency and impotence can be
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duced, unleſſe by making the ſame additions and ſubſtractions,
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one while greater, and another while leſſer; ſo that the
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tion and the retardment of the compound motion, may be made,
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ſometimes in greater, and ſometimes in leſſer proportion.</
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The alterations
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in the effects argue
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alteration in the
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cauſe.
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The cauſes at
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large aſſigned of
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the Periods
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nethly and
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al of the ebbing
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and flowing.
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The monethly
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and annual
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tions of the tide can
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depend upon
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thing, ſave on the
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alteration of the
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additions &
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ſtractions of the
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diurnal period from
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the annual.
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<
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>SAGR. </
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>I feel my ſelf very gently led, as it were, by the hand,
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and though I finde no rubs in the way, yet nevertheleſſe, like a
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blind man, I ſee not whether your Clue leadeth me, nor can I
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imagine where ſuch a Journey will end.</
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>SALV. </
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>Though there be a great difference between my ſlow
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pac't Philoſophy, and your more nimble Reaſon, yet
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leſſe, in this particular which we are now upon, I do not much
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wonder, if the apprehenſiveneſſe of your wit be a little
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red by the dark and thick miſt that hides the mark, at which we
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aime: and that which leſſeneth my admiration is, the
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brance of the many hours, many dayes, yea more, many nights
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that I have conſumed in this contemplation, and of the many
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times that, deſpairing to bring it to a period, I have, for an
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couragement of my ſelf, indeavoured to believe, by the
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ple of the unfortunate
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Orlando,
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that that might not poſſibly be
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true, which yet the teſtimony of ſo many credible men ſet
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fore my eyes: wonder not, therefore, if this once, contrary to
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your cuſtome, you do not foreſee what I intend: and if you will
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needs admire, I believe that the event, as far as I can judge
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expected, will make you ceaſe your wonderment.</
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>SAGR. </
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>I thank God, that he did not permit that deſperation
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of yours to end in the
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Exit
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that is fabled of the miſerable
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lando,
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nor in that which haply is no leſſe fabulouſly related of
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Ariſtotle,,
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that ſo neither my ſelf nor others ſhould be deprived
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of the diſcovery of a thing, as abſtruſe as it was deſirable: I
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beſeech you, therefore, to ſatisfie my eager appetite as ſoon as
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you can.</
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<
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>SALV. </
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>I am ready to ſerve you: We were upon an inquiry
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in what manner the additions and ſubſtractions of the </
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