This volume contains twenty-one studies of various aspects of Judaeo-Arabic, the language spoken by Jews living in the Muslim countries of the Middle Ages. Using mainly the manuscript treasures found in the depository (Genizah) of the Ben Ezra Synagogue in Cairo, the essays, by an international group of scholars belonging to the Society for Judaeo-Arabic Studies, not only deal with linguistic, literary and philosophical ideas of the Jews, but also touch on medicine, magic and relations with other religions. It is the most up-to-date treatment of the subject available in English.