Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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aliqua applicatione, ſaltem virtutis, in quo non eſt difficultas; </
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<
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">quomo
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do vero ignis accendatur, & quid ſit ignem accendi, explicabimus ſuo
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loco; quidquid ſit, certum eſt ad productionem impetus requiri ali
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quam applicationem, vt patet etiam in magnete. </
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<
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<
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Axioma XI.
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<
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Si cauſa vniuoca applicata, & non impedita est ſufficiens ad productionem
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effectus, non eſt ponenda alia ſcilicet æquiuoca.
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</
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<
s
id
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N11BA8
"> Non dico omnem cauſam
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eſſe vniuocam, ſed tantùm vniuocam ſufficientem, & applicatam eſſe
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cauſam, v. g. calor eſt cauſa ſufficiens caloris, vt conſtat in aqua calida; </
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igitur ſi calor eſt applicatus ſubiecto, in quo producitur calor non ſupe
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rans vires caloris applicati; </
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<
s
id
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">dicendum eſt calorem illum ab hoc produ
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ci; </
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<
s
id
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">cum calor ſit cauſa neceſſaria; </
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<
s
id
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">igitur ſi ſit applicatus ſubjecto apto,
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neceſſariò agit; </
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<
s
id
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N11BCB
">igitur quantum poteſt; igitur effectus non eſt tribuen
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dus alteri cauſæ, quam ſufficientem eſſe ignoramus. </
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<
s
id
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">Ad hoc Axioma aliud reuoca.
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Si ex applicatione alicuius ſequitur ſem
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per effectus aliquis, illud ipſum cauſa dici debet huius effectus; </
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<
s
id
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N11BDC
">licet aliud ſit
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coniunctum, ex quo ſeorſim ſumpto applicato non ſequitur effectus
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; </
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<
s
id
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">v. g. ex
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applicatione aquæ calidæ ſequitur productio caloris; </
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<
s
id
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">ex applicatione ſo
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lius aquæ non ſequitur; </
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<
s
id
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">igitur dicendum eſt calorem hunc produci ab
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ipſo calore, qui aquæ ineſt, non verò ab ipſa aquæ ſubſtantia; idem dico
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de ferro frigido, &c. </
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>
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<
s
id
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">Dices non eſſe certum calorem produci; Reſpondeo, negando; </
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<
s
id
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">ſed,
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quidquid ſit, loquor tantùm hypotheticè; dixi enim ſi producatur, à
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calore aquæ inhærente producitur. </
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</
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type
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<
s
id
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">Dices produci poſſe ab aliqua cauſa ignota poſita dumtaxat tali, vel
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tali conditione. </
s
>
<
s
id
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N11C12
">Reſpondeo, hoc reuera geometricè non probari, ſed
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tantùm phyſicè; </
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<
s
id
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N11C18
">quidquid ſit, voco cauſam id, ex cuius applicatione
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ſequitur ſemper effectus, & nunquam aliàs; </
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>
<
s
id
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N11C1E
">nam phyſicè loquendo, ſiue
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ſit alia cauſa, ſiue non, eodem modo ſe habet, ac ſi eſſet cauſa; quippe
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certum eſt phyſicè ignem calefacere, Solem illuminare, quod ſatis eſt. </
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Axioma XII.
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<
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Cauſa neceſſaria ſubiecto apto applicata, & non impedita ſemper agit, &
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quantum poteſt.
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</
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<
s
id
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"> Hoc Axioma duas partes habet; </
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<
s
id
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">prima certa eſt per hy
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poth. 8. & per definitionem cauſæ neceſſariæ, quæ in hoc differt à libe
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râ: Secunda pars probatur; </
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>
<
s
id
="
N11C4B
">quia ſi partem effectus omitteret, quam ta
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men ponere poſſet; haud dubiè non eſſet cauſa neceſſaria contra hypoth. </
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<
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nam ſi vnam partem effectus omittat; cur vnam potiùs quam aliam? </
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<
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cur non duas? </
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<
s
id
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">cur non omnes? </
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>
<
s
id
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">denique video cauſam eandem eidem
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ſubiecto eodem modo applicatam, eundem ſemper effectum producere
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per Hyp. 8. </
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Axioma XIII
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Extenſio cauſa non intendit effectum ad intra.
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<
s
id
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"> Quælibet pars maioris
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ignis non habet calorem intenſiorem, quàm quælibet pars minoris; idem </
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</
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