a deep impression on the minds of the Greeks, have been ascribed to a mere spirit of ostentation on the part of Xerxes; the vain-glorious monarch wished, it is supposed, to parade his power, and made a useless bridge and an absurd cutting merely for the purpose of exhibiting to the world the grandeur of his ideas and the extent of his resources. But there is no necessity for travelling beyond the line of ordinary human motive in order to discover a reason for the works in question. The bridge across the Hellespont was a mere repetition of the construction by which Darius had passed into Europe when he made his Scythian expedition, and probably seemed to a Persian not a specially dignified or very wonderful way of crossing so narrow a strait, but merely the natural mode of passage. The only respect in which the bridge of Xerxes differed from constructions with which the Persians were thoroughly familiar, was in its superior solidity and strength. The shore-cables were of unusual size and weight, and apparently of unusual materials; the formation of a double line--of two bridges, in fact, instead of one--was almost without a parallel; and the completion of the work by laying on the ordinary plank-bridge a solid causeway composed of earth and brushwood, with a high bulwark on either side, was probably, if not unprecedented, at any rate very uncommon. Boat-bridges were usually, as they are even now in the East, somewhat rickety constructions, which animals unaccustomed to them could with difficulty be induced to cross. The bridge of Xerxes was a high-road, as AEschylus calls it along, which men, horses, and vehicles might pass with as much comfort and facility as they could move on shore.