Vitruvius
,
De architectura libri decem ad Caesarem Augustum, omnibus omnium editionibus longè emendatiores, collatis veteribus exemplis
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DE ARCHITEC. LIB. II.
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ſtructuris conuenit: </
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<
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xml:space
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">ex fistuloſo verò, aut molliori lapide, tectorijs adhibetur utili{us}.
<
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</
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<
s
xml:id
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echoid-s3935
"
xml:space
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">Quod autem ad ſilicem attinet, tria Romæ vidim{us} genera, album, nigrum ſiue
<
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fuſcum, & </
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<
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">rubrum. </
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<
s
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xml:space
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">Et ex eo quidem fieri calcem, ſed eaten{us}, ſi ſtatim quàm ex
<
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lapicædina exempt{us} eſt, coquatur. </
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<
s
xml:id
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xml:space
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">Reperitur & </
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<
s
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">rutil{us}, cornei coloris, cinere{us}, cæ-
<
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rule{us}, iecoris colore. </
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<
s
xml:id
="
echoid-s3940
"
xml:space
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">Illud quoque ad rem fuerit, lapidem ad calcem non min{us} ho-
<
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ris ſexaginta percoqui, ad gypſum verò horis non pl{us} viginti. </
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>
<
s
xml:id
="
echoid-s3941
"
xml:space
="
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">Nec illud tacendum,
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postquam coct{us} fuerit lapis, int{us} occultum continere ignem, aquis incendi, quib{us}
<
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ſolet ignis extingui, oleo extingui, quo ſolet ignis accendi.</
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<
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<
s
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">Si quis teſtam tuſam, & </
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<
s
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">ſuccretam.</
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<
s
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">] Id eſt cribratam. </
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<
s
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xml:space
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">Nam ſuccerne-
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re, incernere, & </
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<
s
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">excernere Vitruuio dicuntur pro cribrare. </
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<
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">Hîc & </
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<
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">lib. </
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<
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<
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. </
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<
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">cap.
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</
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<
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<
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. </
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<
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xml:space
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">& </
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<
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<
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. </
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<
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xml:space
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">Vnde incerniculum pro cribro vſurpatur.</
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<
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">De puluere Puteolano & ei{us} vſu. # CAP. # VI.</
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<
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<
s
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">EST etiam genus pulueris, quod efficit naturaliter res
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admirandas. </
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<
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">Naſcitur in regionibus Baianis & </
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<
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">in agris
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municipiorum, quæ ſunt circa Veſuuium montem,
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quod commixtum cum calce & </
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>
<
s
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="
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">cęmento, non modo
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cæteris ædificijs præſtat firmitates, ſed etiam moles quę
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conſtruuntur in mari, ſub aqua ſolideſcunt. </
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>
<
s
xml:id
="
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xml:space
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">Hoc au-
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tem fieri hac ratione videtur, quod ſub his montibus, & </
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<
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">terræ feruentes
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ſunt & </
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<
s
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">fontes crebri, qui non eſſent, ſi non in imo haberentaut de ſulphu-
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re, aut alumine, aut bitumine ardentes maximos ignes. </
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>
<
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xml:space
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">Igitur penitus
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ignis & </
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<
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">flammæ vapor per interuenia permanans & </
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<
s
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">ardens, efficit leuem
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eam terram, & </
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<
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">ibi qui naſcitur tophus exugens eſt, & </
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<
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">ſineliquore. </
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<
s
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xml:space
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">Ergo
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cùm tres res conſimili ratione, ignis vehementia formatæ, in vnam perue-
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nerint mixtionem, repente recepto liquore vna cohæreſcunt, & </
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<
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">celeriter
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humore duratæ ſolidantur, neque eas fluctus, neque vis aquæ poteſt diſ-
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ſoluere. </
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>
<
s
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="
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xml:space
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">Ardores autem eſſe in his locis, etiam hæc res poteſt indicare,
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quòd in montibus Cumanorum & </
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<
s
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="
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">Baianis ſunt loca ſudationibus exca-
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uata, in quibus vapor feruidus ab imo naſcens, ignis vehementia perfo-
<
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rat eam terram, per eamq́; </
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>
<
s
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">manando in his locis oritur, & </
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<
s
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">ita ſudationum
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egregias efficit vtilitates. </
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<
s
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">Non minus etiam memoratur antiquitus cre-
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uiſſe ardores & </
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<
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">abundauiſſe ſub Veſuuio monte, & </
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<
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">inde euomuiſſe circa
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agros flammam. </
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<
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">Ideoq́; </
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<
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">nunc qui ſpongia ſiue pumex Pompeianus vo-
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catur, excoctus ex alio genere lapidis, in hanc redactus eſſe videtur gene-
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ris qualitatem. </
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>
<
s
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="
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xml:space
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">Id autem genus ſpongiæ, quod inde eximitur, non in
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omnibus locis naſcitur, niſi circum Aetnam & </
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<
s
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">collibus Myſiæ, quæ à
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Græcis {κα}τακεη{αυ}{υέν}οι nominantur, & </
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<
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">ſi quæ eiuſcemodi ſunt locorum
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proprietates. </
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<
s
xml:id
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"
xml:space
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">Si ergo in his locis aquarum feruentes inueniuntur fontes,
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& </
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>
<
s
xml:id
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xml:space
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">in montibus excauatis calidi vapores, ipſaq́; </
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<
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">loca ab antiquis memo-
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rantur peruagantes in agris habuiſſe ardores, videtur eſſe certum ab </
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