Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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              mirandum, quod tradit Ferdinandus Corteſius, in Mexico eſſe
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              lapidem coloris flavi; ex quo novaculæ fiant acutiſſimæ: quæ
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              non à ferro, aut cote, ſed ex aquâ illam aciem trahant. </s>
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              <s>Videtur autem hæc proprietas innuere huius cognationem
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              cum aquâ;
                <expan abbr="eſſéq;">eſſéque</expan>
              veluti glaciem ex aquâ concretam: à quâ
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              rurſum atteratur & liquefiat: mox tamen ab aëre eo modo,
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              quo ovorum cortices, indurari. A motibus iam dictis differt
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              terebratio & perforatio:
                <expan abbr="fitq;">fitque</expan>
              duobus modis. </s>
              <s>Vt cùm cavi­
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              tas inducitur
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              deperditione alicuius particulæ: & cùm
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              partes ab illâ cavitate excluduntur. </s>
              <s>Et primo quidem modo
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              cavitas fit per compreſſionem: quam ſola
                <foreign lang="grc">πιες ὰ</foreign>
              admittunt, cu­
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              iuſmodi metalla & ligna: nequaquam verò
                <foreign lang="grc">τὰ θζαυ
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                ὰ</foreign>
              at gem­
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              mæ, lapides, vitra. </s>
              <s>Cùm deperditione verò ſubſtantiæ & hæc
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              & reliqua omnia cavantur: licet non uno modo omnia. </s>
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              <s>Nam gemmæ quidem & vitra non niſi politurâ,
                <expan abbr="ſenſimq;">ſenſimque</expan>
              ra­
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              dendo perforantur: terebratione verò ligna, metalla, oſſa. </s>
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              <s>Et ſicuti terebra figurâ à ſe differunt; ita etiam modus perfo­
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              randi. </s>
              <s>Alia enim circulo; alia formâ ſemilunari terminan­
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              tur: alia cochleatim ſtriata, ab acuto ſenſim augentur & late­
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              ſcunt. </s>
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                <expan abbr="Atq;">Atque</expan>
              hæc quidem à perforatione incipiendo
                <foreign lang="grc">σχίσει χ
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                ́
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                χλάσει</foreign>
              terminant motum. </s>
              <s>Dum enim cochlea circum acta
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              in partem compreſſam vulnus agit, & quæ à tergo ſequitur
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              helix, ambit latiore plagâ; in tenues & friabiles lamellas eâ
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              ratione ſcobinatur helicoides, à plagâ inciſus conus:
                <expan abbr="eoq;">eoque</expan>
              in
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              helicem cavam recepto terebratio procedit,
                <expan abbr="quouſq;">quouſque</expan>
              cochlea
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              repleta ſcobe, educi & expurgari debeat. </s>
              <s>Videtur autem hic
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              ratio vectis intervenire: cuius hypomochlium in centro mo­
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              tûs: extrema verò ſunt circelli ſenſim aucti & in conum late­
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              ſcentes. </s>
              <s>Verùm huiuſmodi terebella ſuperficiem, quæ am­
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              bit plagam, minùs æqualem relinquunt: calorem verò ob
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              multiplicem motum adaugent. </s>
              <s>
                <expan abbr="Itaq;">Itaque</expan>
              minùs apta cranio </s>
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