Descartes, René, Renati Des-Cartes principia philosophiae

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              bili, nonnullam vim magneticam breviſſimo tempore
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              poſſit accipere. </s>
              <s>Nempe ſi ſit oblongum, nullâ tali vi
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              adhuc imbutum, & unâ ſuâ extremitate verſus Ter­
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              ram inclinetur, protinus ex hoc ſolo acquiret, in iſtâ
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              extremitate verſus Terram inclinatâ, vim poli Auſtra­
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              lis in his Borealibus regionibus; & momento illam
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              amittet, ac planè contrariam acquiret, ſi eadem ejus
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              extremitas attollatur, & oppoſita deprimatur. </s>
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            <p type="margin">
              <s>
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              CLXV.
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              Cur ipſa etiam terra
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              vim magneticam fer­
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              ro tribuat d. </s>
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              <s>
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              25</s>
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              <s>
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              5</s>
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              <s>
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              Sed ſi quaeratur, cur iſta vis in Terrâ, maximo ma­
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              gnete, debilior ſit quàm in aliis minoribus, reſpondeo,
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              me non putare illam eſſe debiliorem, ſed potiùs multò
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              fortiorem, in mediâ illâ Terrae regione, quam totam
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              particulis ſtriatis perviam eſſe ſuprà dictum eſt b; ve­
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              rum iſtas particulas ſtriatas, ab ipſâ egreſſas, maximâ
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              ex parte reverti per interiorem illam ſuperioris Terrae
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              regionis cruſtam, ex quâ metalla oriuntur, & in quâ
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              ſunt etiam multi meatus iis recipiendis idonei; atque
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              idcirco perpaucas uſque ad nos pervenire. </s>
              <s>Judico
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              enim iſtos meatus, tum in illâ cruſtà interiore, tum
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              etiam in magnetibus, & ferri ramentis, quae in venis
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              hujus exterioris continentur, planè alio modo con­
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              verſos eſſe, quàm meatus mediae regionis: ita ut par­
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              ticulae ſtriatae, quae per hanc mediam regionem ab
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              Auſtro ad Boream fluunt, revertantur à Boreâ ad
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              Auſtrum per omnes quidem ſuperioris partes, ſed
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              praecipuè per ejus cruſtam interiorem, itemque per
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              magnetes & ferrum exterioris; quò cùm maxima
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              earum pars ſe conferat, paucae ſuperſunt quae per
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              hunc noſtrum ae
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              rem, & alia circumjacentia corpora,
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              </s>
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            <p type="margin">
              <s>
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              CLXVI.
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              Cur vis magnetica in
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              Terrâ debilior ſit,
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              quàm in parvis ma­
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              gnetibus a. </s>
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            <p type="margin">
              <s>
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              10</s>
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            <p type="margin">
              <s>
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              15</s>
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            <p type="margin">
              <s>
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              20</s>
            </p>
            <p type="margin">
              <s>
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              25</s>
            </p>
            <p type="head">
              <s>
                <emph type="italics"/>
              NDEX</s>
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            <p type="head">
              <s>PRINCIPIORUM PHILOSOPHIAE
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              ________
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              piAvertissement
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              III
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              EPISTOLA DEDICATORIA
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              I
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              ________ </s>
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            <p type="head">
              <s>PARS PRIMA.</s>
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              <s>
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              De principiis cognitionis humanae.
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              p
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              1. </s>
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              Veritatem inquirenti, ſemel
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              in vitâ de omnibus, quan­
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              tum fieri poteſt, eſſe dubi­
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              tandum
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              5
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              2. </s>
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              Dubia etiam pro falſis ha­
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              benda
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              È
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              3. </s>
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              Hanc interim dubitationem
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              ad uſum vitae non eſſe re­
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              ferendam
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              È
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              4. </s>
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              Cur poſſimus dubitare de
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              rebus ſenſibilibus
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              È
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              5. </s>
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              Cur etiam de Mathematicis
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              demonſtrationibus
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              6
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              6. </s>
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              Nos habere liberum arbi­
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              trium, ad cohibendum aſ­
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              ſenſum in dubiis, ſicque ad
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              errorem vitandum
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              È
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              7. </s>
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              Non poſſe à nobis dubitari,
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              quin exiſtamus dum dubi­
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              tamus; atque hoc eſſe pri­
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              mum, quod ordine philo­
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              ſophando cognoſcimus
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              È
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              8. </s>
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              Diſtinctionem inter animam
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              &scorpus, ſive inter rem
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              cogitantem & corpoream,
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              hinc agnoſci
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              7
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              9. </s>
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              Quid ſit cogitatio
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              È
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              10. </s>
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              Quae ſimpliciſſima ſunt &
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              per ſe nota, definitionibus
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              Logicis obſcuriora reddi. </s>
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              &stalia inter cognitiones
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              ſtudio acquiſitas non eſſe
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              numeranda
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              8
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              11. </s>
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              Quomodo mens noſtra no­
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              tior ſit quàm corpus
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              È
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              12. </s>
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              Cur non omnibus aeque
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              innoteſcat
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              9
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              13. </s>
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              Quo ſenſu reliquarum re­
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              rum cognitio à Dei cogni­
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              tione dependeat
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              È
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              14. </s>
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              Ex eo quòd exiſtentia ne­
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              ceſſaria in noſtro de Deo
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              conceptu contineatur, rectè
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              concludi Deum exſiſtere
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              10
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              15. </s>
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              Non eodem modo in alia­
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              rum rerum conceptibus </s>
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          </chap>
        </body>
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    </archimedes>
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