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

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              <s id="s.000689">
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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              <s id="s.000690">
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              PROP. LXVIII.
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              Flamma rarior fumo minus ſpatium occupat ob
                <expan abbr="maximã">maximam</expan>
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              eius velocitatem, redditurque poſtea inuiſibilis noua
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              de cauſa, & tactui languida ob eius
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              diſperſionem.
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              <s id="s.000692">OBſeruatur profectò titionem fumi copiam
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                tem</expan>
              euomere, ſed ſi denuò eius flamma reui­
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              uiſcat, hęc mirabili velocitate fumi illius vaſtam mo­
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              lem abſumere videtur, eumque in exiguum ſpatium
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              flammæ concludere, cùm reuera non ſit reſtrictio,
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              flamma enim maiorem raritatem habet, quàm fumus,
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              pendet ergo hoc ab ineffabili velocitate partium̨
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              flammæ. </s>
              <s id="s.000693">aliundè enim notum eſt per reſtrictum flu­
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              minis canalem molem ampliſſimam aquæ totius flu­
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              minis pertranſire, non quia in exiguo, & reſtricto illo
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              ſpatio canalis condenſetur tota aqua fluuij, ſed quia
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              velociſſimo motu per eum excurrit; cùm è contrà in
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              parte ampla fluuij aqua lentiſſimo curſu progredia­
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              tur, ſic paritèr in fumo particulæ eius lento, & tardo
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              gradu excurrentes amplum, & grande ſpatium oc­
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              cupabant, in flamma verò
                <expan abbr="eædẽ">eædem</expan>
              particulæ veluti per
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              ſtrictiſſimum canalem mirabili, & ineffabili veloci­
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              tate currunt, & ſic poſſunt exiguum ſpatium comple­
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              re. </s>
              <s id="s.000694">Sed quare flamma vltra verticem eius non exten­
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              ditur, neque viſibilis redditur? </s>
              <s id="s.000695">hìc primò
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              ,
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              quòd reuerà flamma producitur vltra eius verticem
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              per notabile ſpatium, & hoc quidem percipitur non </s>
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