Alchemy in the Cairo Genizah: the Nachlass of an untidy Jewish alchemist

Among the hundreds of thousands of fragments of mediaeval manuscripts found in the genizah of the Ben Ezra Synagogue of al-Fusṭāṭ (Old Cairo), a noteworthy corpus of alchemical material preserves alchemical recipes and theoretical works that have the potential to shed light on the oft-debated question of the involvement of Jews in alchemy during the Middle Ages. After an assessment of the status quaestionis, this article offers an introduction to the corpus and to its codicological, palaeographic and linguistic features, and focusses on a discreet number of fragments that were composed by the same alchemist/copyist. The first Judaeo-Arabic edition, Arabic transcription and English translation of a selection of passages from these fragments is presented, together with discussion of their contents. While the first of the fragments is a collection of practical alchemical recipes, the second fragment preserves the Judaeo-Arabic version of a work by the famous alchemist Jābir ibn Ḥayyān that was previously considered lost.