to battle, the hope of victory is in the front, in the rear the assurance of a retreat. Their horses and camels, who in eight or ten days can perform a march of four or five hundred miles, disappear before the conqueror; the secret waters of the desert elude his search; and his victorious troops are consumed with thirst, hunger, and fatigue, in the pursuit of an invisible foe, who scorns his efforts, and safely reposes in the heart of the burning solitude. The arms and deserts of the Bedouins are not only the safeguards of their own freedom, but the barriers also of the happy Arabia, whose inhabitants, remote from war, are enervated by the luxury of the soil and climate. The legions of Augustus melted away in disease and lassitude; and it is only by a naval power that the reduction of Yemen has been successfully attempted. When Mohammed erected his holy standard, that kingdom was a province of the Persian empire; yet seven princes of the Homerites still reigned in the mountains; and the vicegerent of Chosroes was tempted to forget his distant country and his unfortunate master.” Yemen was the only Arabian province which had the appearance of submitting to a foreign yoke; but even here, as Mr. Gibbon himself acknowledges, seven of the native princes remained unsubdued: and even admitting its subjugation to have been complete, the perpetual independence of the Ishmaelites remains unimpeached. For this is not their country. Petra, the capital of the Stony Arabia, and the principal settlement of the Nabathæi, it is true, was long in the hands of the Persians and Romans; but this never made them masters of the country. Hovering troops of Arabs confined the intruders within their walls, and cut off their supplies; and the possession of this fortress gave as little reason to the Romans to exult as the conquerors of Arabia Petræa, as that of Gibraltar does to us to boast of the conquest of Spain.