During the eleventh century of the Hijrah (A.D. 1592-1689) there lived Mustafa bin Abdullah Katib Jelaby, otherwise known as Haji Khalfa, and commonly called Mustafa Haji Khalfa, a man of science as a Turkish historian and geographer, but an Arabic encyclopaedist and bibliographer. He was the compiler of a work containing many thousands of titles of Arab, Persian, and Turkish books, with the names of their authors. Fluegel edited this great work under the title of 'Lexicon Enciclopaedicum et Bibliographicum,' with a Latin translation in seven bulky volumes, and it is an extremely valuable work of reference, put together with the most astonishing and persevering care, and consulted by all who desire information on Arabic, Persian, and Turkish literature. This was printed by the Oriental Translation Fund between A.D. 1835 and 1850, and will always remain as one of the most valuable works printed by that most useful society, whose extinction must ever be regretted by all Orientalists and persons interested in Oriental literature. Haji Khalfa wrote another interesting work, giving a detailed account of the maritime wars of the Turks in the Mediterranean and Black Sea and on the Danube, which has been translated by Mr. James Mitchell. The date of Haji Khalfa's death is uncertain. He is known to have been alive in A.D. 1622, and still in 1652, and he is supposed to have died in A.D. 1657. The works of Abul Khair, previously mentioned, and of Haji Khalfa, embody a mass of information, and constitute the top of the pyramid of encyclopaedical and biographical works, after which nothing worthy of mention has been written on these subjects. The basis of this pyramid had been already laid by An-Nadim, the author of the 'Fihrist,' who flourished A.D. 987, and by Ibn Khallikan, who died A.D. 1282. During this century (A.D. 1592-1689) of the most sanguinary wars, revolutions and dethronements, the condition of Arab literature in the Ottoman Empire was neither progressive nor satisfactory. Nevertheless, the study of the sciences, and especially the linguistic and juridical branches of them, were fostered not only in Constantinople, but also in Syria and Egypt, in consequence of the institution of the body of Ulema, established by Muhammad II., the Conqueror (A.D. 1451-1481), and improved by Sulaiman I., the Law-giver (A.D. 1520-1566), which sheltered the cultivation of science from the storms of war within the inviolable precincts of religion. Mention may be made of Muhammad-Al-Amin, the learned philologist and lawyer of Damascus, who was born in that town about the middle of the eleventh and died the beginning of the twelfth century of the Hijrah, and produced a dozen respectable works, the principal of which bears the title of 'The Biographies of the Celebrated Men of the Eleventh Century,' A.H. He gives an account of a couple of hundred scholars, who represented in Egypt and in Syria the last rays of the setting sun of Arabian literature.