De mirabilibus mundi ("On the Marvels of the World"),[1] which also circulated under the titles De secretis naturae and Liber secretorum, is an anonymous book of natural magic written in Latin in the 13th century.
[1] De mirabilibus consists of recipes or experiments (experimenta) by which one can supposedly harness occult powers in nature through a form of sympathetic magic.
This involves knowledge of the powers of attraction and repulsion of natural objects, which can be obtained by reason and experience.
[1] The prologue espouses a popularized form of Aristotelianism and the author was also familiar with Avicenna and the Pseudo-Platonic magical Liber vaccae, from a which a good number of recipes are taken.
[1][2] The later recipes are mostly just "conjuring tricks" and "hallucinogenic suffumigations" drawn probably from the Book of Fires of Marcus Graecis.