Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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HERONIS
ALEXANDRINI
SPIRITALIUM
LIBER.

CUm ſpiritalis tractatio maximo ſtudio digna
ab Antiquis, tum Philoſophis, tum Mecha-
nicis exiſtimata ſit, illis quidem ratione ejus
vim, ac facultatem tractantibus; his vero
etiam per ipſam ſenſilium actionem: neceſ-
ſarium fore judicavimus, quæ ab antiquis
tradita ſunt in ordinem redigere; & quæ nos ipſi inveni-
mus exponere. Ita enim ſiet ut qui poſthac in mathema-
ticis verſari volent, ex his maxime adjuventur. Præterea
cum arbitraremur conſentaneum eſſe tractationem hanc co-
hærere ei, quæ de aquaticis horoſcopiis in quatuor libris eſt
tradita, de ipſa conſcribere inſtituim us quemadmodum
dictum eſt. Etenim per conjunctionem aëris, ignis, aquæ,
& terræ: & tribus elementis, vel etiam quatuor inter ſe
congredientibus variæ diſpoſitiones eſſiciuntur; aliæ qui-
dem neceſſarios vitæ noſtræ uſus præbentes. Aliæ vero ter-
ribilem quandam admirationem moventes.

De vacuo.

Verum antequam ad ea, quæ dicenda ſunt, aggredia-
mur, de vacuo diſputandum eſt. alii enim univerſe nullum
omnino vacuum eſſe affirmant; alii coacervatum quidem na-
tura nullum eſſe vacuum, ſed ſecundum exiguas partes

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