The history of Arabia naturally divides itself into three periods, the Ancient, the Military, and the Modern. The first carries us down to the age of Mohammed, and is called by the Arabs the Times of Ignorance. The second includes the wars of the Saracens, and the empire of the caliphs. The third embraces the events from the fall of the caliphate to the present day. The native writers who treat of the first period all flourished, as has been observed, posterior to the era of the Prophet...