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The De Subtilitate represents Cardan's original conception of a treatise dealing with the Cosmos, but during the course of its preparation a vast mass of subsidiary and contingent knowledge accumulated in his note-books, and rendered necessary the publication of a supplementary work, the De Varietate, which, by the time it was finished, had grown to a bulk exceeding that of the original treatise.
In another passage of the De Subtilitate he displays judicious reserve in writing of Demons in general.
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