Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PRÆFATIO.
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mento Metaphyſico noviſſe, & </
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in effectibus ipſis contemplari.</
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xml:space
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">Satis ergo patet, quinam ſit ſcopus Phyſices, exqui-
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bus Naturæ Legibus Phænomena ſint deducenda; </
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">& </
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<
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re, quando ad Leges generales pervenimus, non ulterius
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in cauſarum cognitionem penetrare poſſimus. </
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<
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">Supereſt,
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ut de ipſarum Legum inveſtigatione dicamus, & </
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">tres re-
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gulas Newtonianas in primo hujus Operis capite traditas
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ſequendas eſſe probemus.</
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<
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">Prima eſt, cauſas rerum naturalium non plures admitti
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debere quam quæ veræ ſint, & </
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">earum Phænomenis expli-
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candis ſufficiant. </
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<
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">Pars prior ex ante dictis pleniſſime ſequi-
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tur. </
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">Altera a nemine, qui ſapientem rerum Conditorem
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non negat, in dubium vocari poteſt; </
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">ſi cauſa non ſuffi-
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cit, veram non eſſe ſponte ſequitur; </
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">ſi ſufficit aliam fu-
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peraddere inutile erit. </
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">Adde effectum ex duplici cauſa
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nunquam exactiſſime eundem eſſe cum effectu ex ſimplici;
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</
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">ergo duabus effectus explicetur, unica non ſufficiet.</
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<
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">Regulæ duæ ſequentes ut probentur, quædam generalia
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præmittenda ſunt.</
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<
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xml:space
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">Jam monuimus Demonſtrationes Mathematicas niſi
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circa ideas non verſari, & </
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">ubi de rebus ipſis agitur ante
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omnia requiri, ut cum rebus ideæ conveniant, quod nul-
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lâ Mathematicâ demonſtratione probari poteſt. </
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tamen omnibus momentis circa resipſas ratiocinandum
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ſit, & </
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">nil de rebus in mente dari poſſit præter ha-
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rum ideas, ratiociniaque omnia ideas immediate ſpe-
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ctent, ſequitur a DEO conſtitutas quaſdam regulas, </
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