The illuminated opening of a copy of the alchemical treatise Kit?b al-Burh?n f? asr?r ?ilm al-m?z?n (Proof Regarding the Secrets of the Science of the Balance) by al-Jaldak? (d. 1342/743). The undated and unsigned copy was made in Morocco and is typical of products made in the scribal workshops of Marrakesh during the second half of the 19th century. This treatise is concerned in large part with the alchemical theory of the balance; but it also includes an elaborate classification of animals; plants; and minerals. In essence it is a summary of knowledge up to al-Jaldak?s day; not only in alchemy but also in cosmology; physics; astrology; and numerology. .