Musschenbroek, Petrus van, Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae

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            <s xml:id="echoid-s142" xml:space="preserve">
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            ximas diffunditur diſtantias, qua Ferrum aliusve Magnes attrahitur
              <lb/>
            ab alio, viſa mihi fuit omnino diſtinguenda a priori Attractione, hæc
              <lb/>
            enim mutabilis eſt, & </s>
            <s xml:id="echoid-s143" xml:space="preserve">fere penitus ex Magnete profligari poteſt, aut
              <lb/>
            ad ſilentium deduci; </s>
            <s xml:id="echoid-s144" xml:space="preserve">uti ex Experimentis inferius commemorandis
              <lb/>
            conſtabit: </s>
            <s xml:id="echoid-s145" xml:space="preserve">nemo autem facile dixerit Legem Naturæ mutabilem eſſe
              <lb/>
            in corporibus. </s>
            <s xml:id="echoid-s146" xml:space="preserve">Quamobrem duplicis generis obtinebit in Magneti-
              <lb/>
            bus Attractio, quarum una a Lege Naturæ pendebit univerſali, unde
              <lb/>
            autem altera pendeat, ignoro huc usque: </s>
            <s xml:id="echoid-s147" xml:space="preserve">Natura in hoc corpore in-
              <lb/>
            numera videtur abſcondidiſſe Myſteria, quorum quo plura revela-
              <lb/>
            mus, eo magis a divinanda cauſa removemur, & </s>
            <s xml:id="echoid-s148" xml:space="preserve">in majorem illapſi
              <lb/>
            hæſitationem quam ante, eo plura ignorari, quo plura ſcimus,
              <lb/>
            quo ea attentiori animo revolvimus, fateri continuo cogimur: </s>
            <s xml:id="echoid-s149" xml:space="preserve">Ali-
              <lb/>
            quando diu meditatus de nonnullis Experimentis, a pororum tum
              <lb/>
            Magnetis, tum Ferri figura, vim pendere doceri videbar, ſed illico
              <lb/>
            alia prodibant phænomena, quæ hujus opinionis imbecillitatem de-
              <lb/>
            monſtrabant: </s>
            <s xml:id="echoid-s150" xml:space="preserve">modo a parva quantitate corporea, quæ in ferro & </s>
            <s xml:id="echoid-s151" xml:space="preserve">in
              <lb/>
            Magnete hæret, vim deducendam credidiſſem, hoc quaſi probante
              <lb/>
            Analyſi Chemica utriusque corporis; </s>
            <s xml:id="echoid-s152" xml:space="preserve">ſed mox plurima ſurgebant ad-
              <lb/>
            verſus hanc ſententiam argumenta, cum ſimplex mallei percuſſio vim
              <lb/>
            ex ferro magneticam profligabat, non amiſſa ulla ſubſtantia. </s>
            <s xml:id="echoid-s153" xml:space="preserve">Similes
              <lb/>
            ſuſpiciones diverſiſſimæ ex inter ſe comparatis oboriebantur Experi-
              <lb/>
            mentis, ſed quarum infirmitas ex collatis aliis cum his iterum elu-
              <lb/>
            ceſcebat: </s>
            <s xml:id="echoid-s154" xml:space="preserve">unde ſemper, quo plura mecum verſabam, & </s>
            <s xml:id="echoid-s155" xml:space="preserve">inter ſe com-
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            parabam, eo incertior evaſi: </s>
            <s xml:id="echoid-s156" xml:space="preserve">Forſitan illa ſecundi generis Attractio,
              <lb/>
            qua Magnes ad longam operatur diſtantiam, non videbitur multis eſ-
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            ſe tam abſtruſa, ſed eam conſiſtere in Fluido aliquo, extrinſecus ambien-
              <lb/>
            te Magnetem, eumque premente verſus alium, aut verſus Ferrum;
              <lb/>
            </s>
            <s xml:id="echoid-s157" xml:space="preserve">pace autem horum Doctiſſimorum Virorum dixerim, me nullam ob-
              <lb/>
            ſervaſſe Hypotheſin magis oppoſitam Experimentis & </s>
            <s xml:id="echoid-s158" xml:space="preserve">veritati, quam
              <lb/>
            hanc; </s>
            <s xml:id="echoid-s159" xml:space="preserve">argumenta, quæ eum in finem infra attuli, examinanda ſunt,
              <lb/>
            ex quibus liquebit, an feſtinanti conſilio hanc concluſionem forma-
              <lb/>
            verim: </s>
            <s xml:id="echoid-s160" xml:space="preserve">præterea obteſtor Philoſophorum, qui cuncta phænomena
              <lb/>
            Magnetica norunt, conſcientiam, an præjudicio omni exuto, convicti
              <lb/>
            penitus ſint ex obſervationibus aut Experimentis, Fluidum aliquod Ma-
              <lb/>
            gneticum, vel Effluvia quædam, (quocunque nomine vocentur perin-
              <lb/>
            de mihi erit) dari, atque ex iis poſſe omnia Mechanice </s>
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