Borro, Girolamo, De motu gravium et levium, 1575
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                memoriæ prodiderunt libro quarto de cælo particula vigeſima
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                ſexta, trigeſimaprima, & trigeſimaſecunda: non enim de
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                ſententia illorum ignis ſurſum aſcendit, quia ignis ſit factus;
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                ſed quia fiat; nam postquam factus est, nullo motu cietur, ſed
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                in ſuo proprio naturalique loco quieſcit.
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                Quo fundamento, licet perperam, vſus tamen fuit aliquan
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                do Zenarcus in libro, quem aduerſus quintam eſſentiam edi­
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                dit auctore Simplicio primo cæli: Nuncupatur etiam violen­
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                ta hæc facultas eſſentialis, quia igni deorſum moueri natura
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                non ineſt, ſed id ei per violentiam accidit, quatenus in terram
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                conuerti poteſt; & conuerſus deorſum incitari, & terram ſur­
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                ſum viciſsim moueri contigit hac eſſentiali facultate; quia ex
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                terra ignis naſcitur; qui postquam natus eſt, omni ſublato im­
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                pedimento ſurſum ad ſuum proprium, ac naturalem locum,
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                vbi nunc luna eſt, concitatur.
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                Secunda facultas proxima nuncupatur; quia agente, qui
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                eamdem ad actum transfert, non indiget; quod elementum il
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                lico genitum ad ſuum proprium, ac naturalem locum ſuapte
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                natura, ac propria ſponte moueatur, niſi per aliquod impe­
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                diens ſtat, quo minus id fiat: at ſi impedimentum auferatur;
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                elementum nuper genitum ad proprium locum naturalem ſta
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                tim incitatur: vt ecce terra, quæ grauis est, vel aliud
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                corpus ponderoſum, in leuiſsimum ignem euadere poteſt; quod
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                ſi fiat, tunc ſuperiorem locum continenter petit: itaque per­
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                ſpicuum eſt id, quodiam facultate leue eſt, cum ad actum le­
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                uitatis erumpit, in ſuperiorem huius orbis plagam ferri, ſubla
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                to enim omni impedimento natura ipſa elementa nuper geni­
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                ta in proprium locum portat; id quod in exculentis, atque po­
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                culentis accidere videmus, & in eo corpore, quod ad ſanitatem
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                recuperandam affectum eſt cum primum enim impedimen-
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