Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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              orbis quadrantes in aëre conſtitutos eâdem
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              ſecundùm ſpeciem grauitate cum argillâ præ­
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              ditos eſſe: quia iam aër in aëre nihil leuitat,
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              & halitus incluſi minùs leuitant, & aqua ſa­
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              tis grauitat, & cætera omnia corpora tan­
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              tum addunt ponderis, quantum illis detrahe­
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              bat aqua, intrà quam exiſtebant, ſcilicet iux­
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              tà molis æqualitatem. </s>
              <s>Id quod pariter di­
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              ctum velim, ſi globus iſte intrà leuiſſimum
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              ignem conſtitutus intelligatur, neque enim
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              ibi tres orbis quadrantes æqualiter cum ar­
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              gillâ grauitarent, ſed longè validiùs. </s>
              <s>Quan­
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              do autem paulò antè grauitatum rationes
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              iniens tres orbis quadrante, quaſi ex merà ar­
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              gillâ in igne conſtitutâ aſſumpſi, id fuit ſo­
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              lùm ad explicandam hypotheſim, qua tri­
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              buebatur grauitas ſpecifica æqualis grauitati
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              argillaceæ. </s>
              <s>Quarè ſi orbis in aëre conſtitua­
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              tur, non ea tantùm eſt illius grauitas, quæ
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              tribus quadrantibus ex argillâ conueniat, ſed
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              perinde ſe habet, ac ſi totus ex argillâ con­
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              ſtaret, vt olim citra omnem controuerſiam
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              admittebamus; adeòque nullum ſubeſſet pe­
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              riculum, ne auolaret. </s>
              <s>Nam ſi poſito ignę
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              omnium leuiſsimo aëris grauitas eſt † 94 2/3,
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              argillæ grauitas eſt † 103 2/3, ac proinde cum
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              orbis totus ex argillâ conſtitutus ponatur. </s>
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              grauior eſt aëre; cum tamen intrà aquam̨ </s>
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