Casati, Paolo, De igne dissertationes physicae, 1686

Table of handwritten notes

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            intempeſtâ nocte valdè procul conſpici poſſit lucernæ lumen, non
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            tamen ex quocunque interuallo: </s>
            <s xml:id="echoid-s11130" xml:space="preserve">quia demum ita tenuis eſt impul-
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            ſus, vt nullum in oculo ſenſum efficiat. </s>
            <s xml:id="echoid-s11131" xml:space="preserve">Neque mirum, ſi lu-
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            cerna remotiſſima videri nequeat, cum & </s>
            <s xml:id="echoid-s11132" xml:space="preserve">aliquæ ſint ſtellæ, qua-
              <lb/>
            rum directi radij adeò ſunt imbecilli, vt aſpectum non mo-
              <lb/>
            ueant, niſi teleſcopij ope plures excipiantur, qui coniuncti id
              <lb/>
            præſtent, quod ſinguli nequeunt. </s>
            <s xml:id="echoid-s11133" xml:space="preserve">Porrò & </s>
            <s xml:id="echoid-s11134" xml:space="preserve">illud hìc animaduer-
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            ſione dignum eſt, quod lucernę quidem flammulam procul vide-
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            mus, eiuſque luce afficitur oculus; </s>
            <s xml:id="echoid-s11135" xml:space="preserve">ſed ab illâ non illuſtrantur cor-
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            pora reliqua nobis proxima: </s>
            <s xml:id="echoid-s11136" xml:space="preserve">immo pręter flammulam illam ſępè
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            nihil conſpicimus abſentes eorum, quę in eâdem patente areâ il-
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            lius ope videntur à circumſtantibus; </s>
            <s xml:id="echoid-s11137" xml:space="preserve">quia videlicet in tanto in-
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            teruallo directus ætherearum particularum appulſus ad oculum,
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            adhuc ſatis validus eſt, vt moueat ęthereas particulas oculo inſi-
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            dentes; </s>
            <s xml:id="echoid-s11138" xml:space="preserve">at impetus idem debilior eſt, quàm vt valeat incidens
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            in obiecta corpora alias pręterea particulas vrgere, quę demum
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            oculum feriant. </s>
            <s xml:id="echoid-s11139" xml:space="preserve">Equidem neque abſurdę, neque omnino incre-
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            dibilis notam inurerem opinioni aſſerenti corporibus ſingulis ſuam
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            ineſſe lucem, ſuos videlicet igniculos (ſulphureis particulis co-
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            lorem tribuendum eſſe affirmant Chymici) qui cœteris particulis
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            commiſti non concipiant motum illum porrectionis & </s>
            <s xml:id="echoid-s11140" xml:space="preserve">contractio-
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            nis, niſi fuerint excitati ab alio corpore lucido, ęthereas particulas,
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            atque adeò ipſos, quos percutiunt, igniculos commouente.
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            </s>
            <s xml:id="echoid-s11141" xml:space="preserve">Sic amplus cyathus vitreus calathoides, ſiuè conicus, ſuo pe-
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            di inſiſtens, ſponte ſuâ nullum edit ſonum: </s>
            <s xml:id="echoid-s11142" xml:space="preserve">ſed, ſi propè illum
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            vocem attollas vehementiùs, ſiue acuta ſit, ſiue grauis, ille
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            ex ſolo aëris motu concipit vibrationem, & </s>
            <s xml:id="echoid-s11143" xml:space="preserve">ſonum ſuæ figuræ
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            congruentem edit, quem admotâ aure manifeſtè percipias. </s>
            <s xml:id="echoid-s11144" xml:space="preserve">Ex-
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            citati igitur in motum, ex ætherearum particularum appulſu,
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            igniculi corporum ſuapte naturâ non lucidorum, imitantes quo-
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            dammodo motum lucidorum, alias priùs quieſcentes æthereas
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            particulas propellunt, alias repellunt appulſas, & </s>
            <s xml:id="echoid-s11145" xml:space="preserve">aſpicientium
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            oculo coloris ſpeciem exhibent aliquando quidem diluti, ali-
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            quando verò ſaturati, pro externi luminis efficacitate, & </s>
            <s xml:id="echoid-s11146" xml:space="preserve">varia
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            ipſorum igniculorum complexione ſuos motus inuicem temperan-
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            tium: </s>
            <s xml:id="echoid-s11147" xml:space="preserve">Ex quo oritur colorum varietas; </s>
            <s xml:id="echoid-s11148" xml:space="preserve">aliqua enim ſunt, quæ
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            diurnâ in luce apparent cærulea, ſed noctu ad facis lumen viden-
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            tur viridia, & </s>
            <s xml:id="echoid-s11149" xml:space="preserve">quò magis puræ lucis naturam participant, </s>
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