A few words must be said about the establishment of places of learning which were celebrated at the time. The first university, in the sense in which such an institution is at present understood, was flourishing in Syria long before any seat of learning of this kind had been established in Europe; and there was another in Egypt. The first institution was called 'The Society of the Brethren of Purity,' and the second (opened at Cairo on the 24th May, A.D. 1005) was founded by Al-Hakim-bramrillah, and bore the name of Dar-ul Hikinat, or Abode of Wisdom. It was under this same name that the library of the Khalifs was formerly known at Baghdad. Later on the great vizier Nizam-ul-Mulk founded a high school at Baghdad, in A.D. 1066. It was not the first that had been established in Islam, but it eclipsed all others of the kind by the abilities of the professors who worked there, viz., the Imam Abu Ishak Shirazi, Al-Ghazali, and others. With the Society of the Brethren of Purity, mentioned above, there were two men closely connected, viz., Al-Tavhidi, who died A.D. 985, and Al-Majridi, who died A.D. 1004, the former in the East, the latter in the West, and both of them are deserving of the general name of philosopher. So much for the Eastern Khalifates. As regards the Western Khalifate, still greater attention was paid to education and learning there. The schools and lectures were attended by many Europeans, who were not, perhaps, sufficiently grateful to the Arabs for keeping up a progress in literature and science while Europe itself was struggling for emancipation from the dark ages which followed the higher cultures of Greece and of Rome. THIRD PERIOD. From the fall of Baghdad, in A.D. 1258, to the present time. The conquest of Baghdad by the Mughals is a most remarkable period, not only in the literature, but also in the history, of the Arabs. It marks the final extinction of the Abbaside dynasty, from whom the ancient power and glory had vanished to such a degree that the authority of the Khalifs may almost literally be said to have been confined to the city only. Halaku Khan, the brother of the grand Khan Kubilai, and grandson of Jenghiz Khan, took and sacked Baghdad, keeping the Khalif imprisoned for some time, but slaying him at last, with his sons and several thousand Abbasides. Al-Mustaa'sim was the thirty-seventh and last Khalif of the house of Abbas, which had reigned over five hundred years, and was now extinguished.