Occult qualities

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those qualities whose effects only were observed, but the nature and relations of whose productive agencies were undetermined; - so called by the schoolmen.

See also: Occult

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But in contrast with Szeemann's interest in the erotic and occult qualities of machinery, Hulten's was more that of a Swedish engineer with a slightly juvenile bent toward the absurd and anarchic.
It is this approach that causes her to neglect Gassendi's treatment of occult qualities without explaining the importance of this topic in the programmatic treatises on the mechanical philosophy, such as Gassendi's Syntagma Philosophicum and Descartes's Principles of Philosophy.
Experiments with instruments that explained music's occult qualities further marginalized natural magic from self-conscious articulation within scientific discourse, as it was no longer needed to explain musical phenomena.
With this edition of a sixteenth-century treatise on magnetism, previously known only from contemporary references, Monica Ugaglia fills a long-noted lacuna in the history of science, and presents historians with the raw materials for a better understanding of early modern views of occult qualities, experiment, and natural philosophy.