FALL OF CARTHAGE. It was not the intention of the khalifs to limit their conquest to Egypt. Othman contemplated the annexation of the entire North-African coast. His general, Abdallah, set out from Memphis with forty thousand men, passed through the desert of Barca, and besieged Tripoli. But, the plague breaking out in his army, he was compelled to retreat to Egypt. All attempts were now suspended for more than twenty years. Then Akbah forced his way from the Nile to the Atlantic Ocean. In front of the Canary Islands he rode his horse into the sea, exclaiming: "Great God! if my course were not stopped by this sea, I would still go on to the unknown kingdoms of the West, preaching the unity of thy holy name, and putting to the sword the rebellious nations who worship any other gods than thee." These Saracen expeditions had been through the interior of the country, for the Byzantine emperors, controlling for the time the Mediterranean, had retained possession of the cities on the coast. The Khalif Abdalmalek at length resolved on the reduction of Carthage, the most important of those cities, and indeed the capital of North Africa. His general, Hassan, carried it by escalade; but reenforcements from Constantinople, aided by some Sicilian and Gothic troops, compelled him to retreat. The relief was, however, only temporary. Hassan, in the course of a few months renewed his attack. It proved successful, and he delivered Carthage to the flames. Jerusalem, Alexandria, Carthage, three out of the five great Christian capitals, were lost. The fall of Constantinople was only a question of time. After its fall, Rome alone remained. In the development of Christianity, Carthage had played no insignificant part. It had given to Europe its Latin form of faith, and some of its greatest theologians. It was the home of St. Augustine. Never in the history of the world had there been so rapid and extensive a propagation of any religion as Mohammedanism. It was now dominating from the Altai Mountains to the Atlantic Ocean, from the centre of Asia to the western verge of Africa. CONQUEST OF SPAIN. The Khalif Alwalid next authorized the invasion of Europe, the conquest of Andalusia, or the Region of the Evening. Musa, his general, found, as had so often been the case elsewhere, two effective allies sectarianism and treason--the Archbishop of Toledo and Count Julian the Gothic general. Under their lead, in the very crisis of the battle of Xeres, a large portion of the army went over to the invaders; the Spanish king was compelled to flee from the field, and in the pursuit he was drowned in the waters of the Guadalquivir.