The low margin of sand that, in truth, gives all its maritime security to the port of Venice and the Lagunes, is called the Lido di Palestrino. It has been artificially connected and secured, in many places, and the wall of the Lido (literally the beach), though incomplete, like most of the great and vaunted works of the other hemisphere, and more particularly of Italy, ranks with the mole of Ancona, and the sea-wall of Cherbourg. The hundred little islands which now contain the ruins of what, during the middle ages, was the mart of the Mediterranean, are grouped together within cannon-shot of the natural barrier. Art has united with nature to turn the whole to good account; and, apart from the influence of moral causes, the rivalry of a neighboring town, which has been fostered by political care, and the gradual filling up of the waters, by the constant deposit of the streams, it would be difficult to imagine a more commodious, or a safer haven when entered, than that which Venice affords, even to this hour. As all the deeper channels of the Lagunes have been preserved, the city is intersected in every direction by passages, which from their appearance are called canals, but which, in truth, are no more than so many small natural branches of the sea. On the margin of these passages, the walls of the dwellings arise literally from out of the water, since economy of room has caused their owners to extend their possessions to the very verge of the channel, in the manner that quays and wharfs are pushed into the streams in our own country. In many instances the islands themselves were no more than banks, which were periodically bare, and on all, the use of piles has been necessary to support the superincumbent loads of palaces, churches, and public monuments, under which, in the course of ages, the humble spits of sand have been made to groan. The great frequency of the canals, and perhaps some attention to economy of labor, has given to by far the greater part of the buildings the facility of an approach by water. But, while nearly every dwelling has one of its fronts on a canal, there are always communications by the rear with the interior passages of the town. It is a fault in most descriptions, that while the stranger hears so much of the canals of Venice, but little is said of her streets: still, narrow, paved, commodious, and noiseless passages of this description, intersect all the islands, which communicate with each other by means of a countless number of bridges. Though the hoof of a horse or the rumbling of a wheel is never heard in these strait avenues, they are of great resort for all the purposes of ordinary intercourse.