Mohammed died in the year 632. No character in all history has been the subject of more conflicting speculations than the Arabian Prophet. By some he has been called a self-deluded enthusiast, while others have denounced him as the boldest of impostors. We shall, perhaps, reconcile these discordant views, if we bear in mind that the same person may, in different periods of a long career, be both. THE KORAN AND THE DOCTRINES OF ISLAM.--Before going on to trace the conquests of the successors of Mohammed, we must form some acquaintance with the religion of the great Prophet. The doctrines of Mohammedanism, or Islam, which means "submission," are contained in the Koran, the sacred book of the Moslems. They declare that God has revealed himself through four holy men: to Moses he gave the Pentateuch; to David, the Psalms; to Jesus, the Gospels; and to Mohammed, the last and greatest of all the prophets, he gave the Koran. "There is no God save Allah," is the fundamental doctrine of Islamism, and to this is added the equally binding declaration that "Mohammed is the Prophet of Allah." The faithful Moslem must also believe in the sacredness and infallibility of the Koran. He is also required to believe in the resurrection and the day of judgment, and an after-state of happiness and of misery. Also he must believe in the absoluteness of the decrees of God,--that he foreordains whatsoever comes to pass, and that nothing man can do can change his appointments. The Koran, while requiring assent to the foregoing creed, inculcates the practice of four virtues. The first is prayer; five times each day must the believer turn his face towards Mecca and engage in devotion. The second requirement is almsgiving. The third is keeping the Fast of Ramadan, which lasts a whole month. The fourth duty is making a pilgrimage to Mecca. ABUBEKR, FIRST SUCCESSOR OF MOHAMMED (632-634).--Upon the death of Mohammed a dispute at once arose as to his successor; for the Prophet left no children, nor had he designated upon whom his mantle should fall. Abubekr, the Apostle's father-in-law, was at last chosen to the position, with the title of Caliph, or Vicar, of the Prophet, although many thought that the place belonged to Ali, the Prophet's cousin and son-in-law, and one of his first and most faithful companions. This question of succession was destined at a later period to divide the Mohammedan world into two sects, animated by the most bitter and lasting hostility towards each other. [Footnote: The Mohammedans of Persia, who are known as Shiites, are the leaders of the party of Ali; while the Turks, known as Sunnites, are the chief adherents of the opposite party.]