Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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              ſcilicèt habeant machinas flexiles, & reſilientes, ſit
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              vt à prædicta ignis penetratione violentèr diſtrahan­
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              tur machinulæ illæ, vt totidem arcus, & ideò pro eo­
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              rum ingenio vim habent ſe recolligendi, & ſe vnien­
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              di cum reliquis partibus fili liquefacti, à quibus di­
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              ſtractæ fuerant: cùmque adueniant duæ aliæ cauſæ
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              accidentales, quarum vna eſt durities, aut minor flu­
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              xibilitas perimetri, aut ſuperficiei eius externæ re­
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              ſpectu partium intermediarum magis fluidarum, vn­
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              de efficitur veluti epidermis, & ſacculus conſiſten­
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              tior; altera cauſa eſt inflatio, quam efficit ignis
                <expan abbr="ve-hemẽtiſſimè">ve­
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                hementiſſimè</expan>
              agitans internas vitri partes fluidiores,
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              quæ cùm circumdentur ambianturque à perimetro,
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              & ſuperficie duriori, & tenaciori, veluti à ſacculo,
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              ſit vt à vi glutinis dum conantur ſe recolligere par­
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              tes prædicti fluidi tota maſſa fuſa, & inflata retraha­
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              tur, recolligaturque versùs filum, & ſic efformetur
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              globulus, & eadem ratione augeatur eius diameter,
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              at dum augetur pila creſcente pondere amittit prio­
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              rem illam formam orbicularem, & efficitur gutta ob­
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              longa deorsùm tendens. </s>
              <s id="s.001935">modò quia vis glutinis, ſeù
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              energia machinularum eſt cauſa retractionis particu­
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              larum fuſarum, hoc dum ſuperat vim exigui ponde­
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              ris prædictæ guttulæ facilè poterit ipſam mouere,
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              & retrahere ſiuè ſursùm, ſiuè lateralitèr.
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