This work contains a catalogue of Arabic-language manuscripts housed in the Bibliothèque Nationale. Over 4,000 manuscripts are listed from topics spanning Christian and Islamic texts, cosmology, geography, philosophy, administrative documents, mathematics, music, astronomy, calendars, astrology, medicine, literature, and linguistics. Also included is a historical introduction, appendix of categories, indices in Franch and Arabic, and collation with the old catalogue numbers. The 1925 supplement is also available from Gorgias Press (sold separately).