MAHMOUD II. or MOHAMMED VI. succeeded his brother in 1808. He extirpated the turbulent janissaries, remodelled the empire, and, amid more perils, perhaps, than ever sovereign encountered, he still reigns. He is the thirtieth monarch of the Ottoman dynasty, and the twenty-fourth on the throne of Constantinople, and has seen four fill the throne of England−-George III., George IV., William IV., Victoria. END OF HISTORICAL SKETCH. CONSTANTINOPLE AND ITS ENVIRONS. [Illustration: T. Allom. J. Cousen. Mosque of Bajazet, Seraskier’s Tower, Yeni Jami, Solimanie, Mahomet, Selim, Tower of Galata. CONSTANTINOPLE FROM THE ENTRANCE TO THE GOLDEN HORN.] THE situations of Oriental cities, in general, possess advantages, in point of view, of which those in the west are deprived: London, Paris, Vienna, and St. Petersburg present only flat levels; and it is necessary to climb some impending height, to obtain a bird’s-eye view, so as to take in any portion except the first line of houses, and the tops of a few of the more lofty edifices which rise behind them. But in the East, every city has its Acropolis: some lofty eminence is chosen to build on, the summit of which is crowned with a fortress, and the sloping sides covered with streets and houses. In this way ancient towns are described by writers, who compare them to amphitheatres, with their streets, like the seats, rising one above the other. Constantinople participates in this advantage in an eminent degree. The approach to this magnificent city, from the Sea of Marmora, is more beautiful, perhaps, than that of any other city in the world. Before the spectator lies a romantic archipelago of islands covered with pine, arbutus, and oak woods, from whence emerges, on every summit, some monastery of the Greek church. These lovely islets seem to float upon a sea generally calm and unruffled, and are beautifully reflected from a surface singularly pure and lucid. Beside them is the coast of Asia Minor, from which rises, at a distance, the vast contour of Mount Olympus, not, as the poet describes it, with “cloudy tops,” but usually unveiled and distinct; its flanks clothed with forests, and its summits crowned with eternal snows, glittering in sunlight, imparting to the heated atmosphere below an imagined feeling of refreshing coolness. In some states of the air, the effect of refraction is so deceptive, that the mountain seems almost to impend over the spectator.