Lecture deliverd by Moritz Steinschneider (1816-1907). Steinschneider's literary output was tremendous, his bibliography containing more than 1,400 items. His main lifelong interest was the study of the relationship between Jewish and general culture, especially during the medieval times. Realizing early that the preliminary requirement to carry out such a study was the thorough and scientific bibliographical recording of all the available printed and manuscript materials, Steinschneider devoted himself to the preparation of many library catalogs and subject bibliographies. In addition to his catalogs and bibliographies, he also provided general introductions to Jewish literary history and to Jewish booklore. In collecting and organizing the materials for his studies on the role of the Jews in medieval culture, his researches led him also to the study of the history of medieval philosophy, and especially that of medieval medicine, the sciences, and mathematics. His works are not only a contribution to Jewish learning but also to Arabic literature and to general medieval cultural history.