Vitruvius - L. Victrvvii Pollionis ad Cesarem Avgvstvm De architectvra

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3427 tes´arenæ mixtionem in ſe corripiút: & ita cohereſcút ſicceſcendo
cum cementis coheunt & efficiunt ſtructurarum ſoliditatem.

De puluere puteolano.

# St etiam genuſ pulueris quod efficit naturaliter res admi
e # randas: naſcitur in regionibus baianis in agris municipi
# orum: que ſunt circa ueſuuium monté: quod cómixtum
cum calce & cemento: non modo ceteris edificiis ṕſtat firmitatem.
Sed etiam moles q́ conſtruuntur in mari ſub aqua ſolideſcút. hoc
aút fieri hac róne uidetur: quod ſub his monfibus & terræ feruen
tes ſunt. & ſontes crebri: qui nó eſſent ſi nó in imo haberét aut de
ſulſure: aut alumine: aut bitumine: ardentes maximos ignes. igit́
penitus ignis aut fláme uapor per interuenia permanans & ardés
efficit leuem eam eam terram: & ibi qđ naſcitur tophus exurgés &
ſine liquore. ergo tú tres res cóſimili róne ignis uehementia forma
ex in uná peruenerunt mixtioné repente recepto liquore una cohe
reſcunt: & celeriter humore durate ſolidant́. Ne eas fluctus-ne
uts aquæ pót diſſoluere. Ardores auté eſſe his in locis etiá hæc res
poteſt indicare: ꝙ in montibus Cumanorú baianis ſunt loca ſuda
tióibus excauata: in quibus uapor feruidus ab imo naſcens ignis
uehemétia perforat eam. terrá. per eam manádo feruidus ab imo
naſcés in his locis oritur: & ita ſudationú egregias efficit utilitates
Non minus etiá memorantur antiquitus creuiſſe ardores & abun
dauiſſe ſub ueſuuio monte: & inde euomuiſſe circa agros flammá.
Ideo nunc q́ ſpongia ſiue pumex pompeianus uocat́ excocto alio
genere lapidis in hanc redactus eſſe uidetur generis qualitatom. id
aút genus ſpongie qđ inde eximit́ nó in oibus locis naſcitur niſi
circú ætnã: & collibus myſie: q́ a græcis cataceraunienos nominat́
& ſiquæ ciuſmodi ſunt locorum proprietates. Si ergo in his locis
aquarum feruentes inueniuntur fontes. & in omnibus excauatis
calidi uapores: ipſa loca ab antiquis memorantur peruagantes
in agris habuiſſe ardores. Videtur eſſe certum ab ignis uehemen-
tia & topho terraquæ: quemadmodum i fornacibus & calce ita ex
his ereptum eſſe liquore. Igitur diſſimilibus & diſparibus rebus
correptis & in unam poteſtatem collatis: calida humoris

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