And the practical execution is worthy of the initial inspiration. After a rapid and condensed narrative of Byzantine history till the end of the twelfth century, he takes up the brilliant theme of Mahomet and his successors. A few pages on the climate and physical features of Arabia fittingly introduce the subject. And it may be noted in passing that Gibbon's attention to geography, and his skill and taste for geographical description, are remarkable among his many gifts. He was as diligent a student of maps and travels as of historical records, and seems to have had a rare faculty of realising in imagination scenes and countries of which he had only read. In three chapters, glowing with oriental colour and rapid as a charge of Arab horse, he tells the story of the prophet and the Saracen empire. Then the Bulgarians, Hungarians, and Russians appear on the scene, to be soon followed by the Normans, and their short but brilliant dominion in Southern Italy. But now the Seljukian Turks are emerging from the depths of Asia, taking the place of the degenerate Saracens, invading the Eastern empire and conquering Jerusalem. The two waves of hostile fanaticism soon meet in the Crusades. The piratical seizure of Constantinople by the Latins brings in view the French and Venetians, the family of Courtenay and its pleasant digression. Then comes the slow agony of the restored Greek empire. Threatened by the Moguls, it is invaded and dismembered by the Ottoman Turks. Constantinople seems ready to fall into their hands. But the timely diversion of Tamerlane produces a respite of half a century. Nothing can be more artistic than Gibbon's management of his subject as he approaches its termination. He, who is such a master of swift narrative, at this point introduces artful pauses, _suspensions_ of the final catastrophe, which heighten our interest in the fate which is hanging over the city of Constantine. In 1425 the victorious Turks have conquered all the Greek empire save the capital. Amurath II. besieged it for two months, and was only prevented from taking it by a domestic revolt in Asia Minor. At the end of his sixty-fifth chapter Gibbon leaves Constantinople hanging on the brink of destruction, and paints in glowing colours the military virtues of its deadly enemies, the Ottomans. Then he interposes one of his most finished chapters, of miscellaneous contents, but terminating in the grand and impressive pages on the revival of learning in Italy. There we read of the "curiosity and emulation of the Latins," of the zeal of Petrarch and the success of Boccace in Greek studies, of Leontius, Pilatus, Bessarion, and Lascaris. A glow of sober enthusiasm warms the great scholar as he paints the early light of that happy dawn. He admits that the "arms of the Turks pressed the flight of the Muses" from Greece to Italy. But he "trembles at the thought that Greece might have been overwhelmed with her schools and libraries, before Europe had emerged from the deluge of barbarism, and that the seeds of science might have been scattered on the winds, before the Italian soil was prepared for their cultivation." In one of the most perfect sentences to be found in English prose he thus describes the Greek tongue: "In their lowest depths of servitude and depression, the subjects of the Byzantine throne were still possessed of a golden key that could unlock the treasures of antiquity, of a musical and prolific language that gives a soul to the objects of sense and a body to the abstractions of philosophy." Meanwhile we are made to feel that the subjects of the Byzantine throne, with their musical speech, that Constantinople with her libraries and schools, will all soon fall a prey to the ravening and barbarous Turk. This brightening light of the Western sky contending with the baleful gloom which is settling down over the East, is one of the most happy contrasts in historical literature. Then comes the end, the preparations and skill of the savage invader, the futile but heroic defence, the overwhelming ruin which struck down the Cross and erected the Crescent over the city of Constantine the Great.