Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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PROBLEMATA NONNVLLA
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De Oculi Pupilla.
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<
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">1. Cvr ei Pupillæ nomen inditum eſt? </
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<
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id
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s.004977
">Admiratione ſanè non caret
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apud præcipuas linguas, miro quodam conſenſu, idem etymon
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obtinere: ſcilicet denominatam eſſe ab imaguncula illa, quæ
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veluti parua puppa, ſeu pupula, ſeu pupilla, qualis in figura
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ſpectatur, perpetuò in paruo hoc vuæ circello ſpectatur. </
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<
s
id
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s.004978
">propter hanc igitur
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puppam Hebræi circellum G B I, Bath, ideſt filiolam, Græci
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grc
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, ideſt puel
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lam, Latini demum pupillam cognominarunt.</
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<
s
id
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s.004979
">2. Atqui vnde imaguncula hæc, quæ in oculis noſtris perpetuò ſpectatur?
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</
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<
s
id
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s.004980
">ſcilicet ob terſitiem, & ſphæricitatem cornea eſt inſtar
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abbr
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cõuexi
">conuexi</
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>
ſpeculi, quod
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ſpectanti imaginem reddat, quam ergò videmus in aliorum oculis puppam,
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noſtra eſt imago, quæ propterea tamen parua eſt, quoniam oculus ſpeculum
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paruum, ac conuexum ſimul eſt, cuius eſt imagines rebus ipſis multò mino
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res reflectere. </
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<
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id
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s.004981
">vt in tractatu de Speculis optici demonſtrant.</
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">3. Cùm tota cornea, quæ Iris maior eſt, ſit æquè torſa, ac perpolita, cur
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non æquè tota hanc pupulam oſtendit? </
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<
s
id
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s.004983
">ſed è regione minoris Iridis ferè tan
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tum? </
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<
s
id
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s.004984
">cauſa eſt in promptu, quia nimirum ſpeculum debet eſſe omnis colo
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ris expers, ne colores ſpeculi coloribus imaginum miſceantur; taliſque eſt
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Iris minor,quæ etiamſi videatur nigra, non tamen verè colorata eſt, vt mox
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oſtendam: at verò maiori Iridi colores vueæ ſubſunt, qui ne ſpeculi officio
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fungatur, ſunt impedimento. </
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<
s
id
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s.004985
">eſt præterea Iris minor admodum opacata,
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quæ altera conditio, maximè ſpeculo neceſſaria eſt: illa enim nigredo Iri
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dis minoris, ſeu pupillæ, non nigredo, ſed opacitas eſt, vt dicetur poſtea.</
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<
s
id
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s.004986
">4. Cùm iam
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cõſtet
">conſtet</
expan
>
foramini vuæ G H I, à pupilla in ipſo verſante nomen
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inditum eſſe; nec non vnde ſit ea pupilla, & cur tam parua; quæritur iam,
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quid ſit pupilla, ſeu Iris minor, an ſcilicet ſit foramen illud vueæ, an potius
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chriſtallinus humor, qui in illud intruditur,
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abbr
="
vacuumq́
">vacuumque</
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>
; illius replet? </
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<
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id
="
s.004987
">Re
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ſpondeo, Ariſt. humorem ipſum
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abbr
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chriſtallinũ
">chriſtallinum</
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>
appellaſſe pupillam: Galenum
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tum chriſtallinum, tum foramen ipſum: aptè tamen
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abbr
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vtrumq;
">vtrumque</
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>
dici exiſtimo.
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</
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<
s
id
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s.004988
">Chriſtallinum quidem & quia replet vacuum illud,
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abbr
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atq;
">atque</
expan
>
è regione illius pu
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pillæ imaguncula ſpectatur. </
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<
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id
="
s.004989
">foramen verò, quia terminos illius rotunditatis
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circumſcribat. </
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<
s
id
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s.004990
">vnde aptius fortè dixeris, vtrumque, chriſtallinum ſcilicet,
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& foramen veluti partes ad totam pupillam conſtituendam eſſe neceſſaria:
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ita vt nihil aliud ipſa ſit, quàm ſuperficies illa chriſtallini; quæ vueæ fora
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mine continetur.</
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<
s
id
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s.004991
">5. Cur in omnibus hominibus nigra videtur? </
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<
s
id
="
s.004992
">cum tamen nigri nihil ibi
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eſſe ex anotomia conſtet: imò ibi chriſtallinus eſt omninò pelluidus; & vl
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tra,
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abbr
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citraq́
">citraque</
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>
; alij duo humores, vitreus, & aqueus, æquè tranſparentes,
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abbr
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atq;
">atque</
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>
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omnis nigredinis expertes. </
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<
s
id
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s.004993
">vnde igitur nigredo illa? </
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<
s
id
="
s.004994
">Dicendum eſt nigre
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dinem hanc non eſſe veram, ſed apparentem,
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abbr
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eamq́
">eamque</
expan
>
; ex interna oculi opa
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citate; opacitatem verò ex foraminis paruitate, quæ lumen non admittat,
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prouenire: quotidiana enim nos docet experientia feneſtellas, & huiuſmodi </
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