Aristoteles; Strato <Lampsacenus>; Theophrastus

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10296SIM. PORTII COMMENTAR. apparet colore cyaneus; propter raritatem.
vbi enim deficit lumen, ibi tenebra interce-
ptus, apparet cyaneus. condenſatus autẽ
quemadmodum & aqua, omnium albiſsi-
mus eſt.

Cùm ad certũ numerum cauſas infinitatis colorũ
reduxerit, & multa de lumine, multáq. de coloribus
explicuerit, & verba fecerit de aqua & aëre, quæ ſunt
prima media: vt de tertia cauſa colorum mediorum,
in præſenti declarat diuerſam naturam aëris & aquæ,
& aliorum mediorum. & Sumit primò, quòd quan-
do medium fuerit album & perſpicuum: vel quando
corpus aliquod, fuerit eiuſmodi, & valde rarum, co-
lore aëreum apparet. Ratio in promptu eſt. nam pro-
pter ſuam perſpicuitatem & luciditatem, aër colorẽ
album ſibi vendicat; & vt ipſe paulò poſt inquiet, ſi ci
tra externam humiditatem, in aqueam craſsitiem co-
ierit, albiſsimum corpus apparebit. IN DENSIS VE
RO' OMNIBVS.) Sumit aliud corpus dẽſiuſculum,
in cuius ſuperficie, (hoc enim ſignificat, ἐπιφ{αί}νετ{αι}.)
ſemper viſitur nubecula quædã, quam vocat ἀχ λ{ὺν},
hoc eſt caliginem, vt in aqua & vitro. in iis enim ap-
paret quædam nubecula ex atro albicans: vt & in aë-
re, quando externo lentore craſſeſcit, & humidior fa-
ctus eſt. Subdit autem rationem, quare hoc non ſit
medium exquiſitum, réſque non ita exacte videntur,
ſicut in medio albo & diaphano. radiis enim, inquit,
propter denſitatem & craſsitudinem aëris deficienti-
bus, nequimus quæ intra eum conduntur exactè vi-
dere, hoc eſt cernere, quales ſua natura ſunt. Cęterum
hùc ſe infert difficultas, quo pacto, ſi per medium
craſsiuſculum res non videntur exactè, per aquam,

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Scan	Original
91	85
92	86
93	87
94	88
95	89
96	90
97	91
98	92
99	93
100	94
101	95
102	96
103	97
104	98
105	99
106	100
107	101
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