Genoa, like so many of the chief Italian towns, has been greatly altered during the last twenty-five years. Its harbors have been much enlarged; its defenses have been extended far beyond their ancient limits. Down by the water-side, among the narrow streets on the shelving ground that fringes the sea, we are still in old Genoa--the city of the merchant princes of the fifteenth and sixteenth centuries; but higher up the slopes a new town has sprung up, with broad streets and fine modern houses, and a "corso," bordered by trees and mansions, still retains in its zigzag outline the trace of the old fortifications which enclosed the arm of Massena. More than one spot, on or near this elevated road, commands a splendid outlook over the city and neighborhood. From such a position the natural advantages of the site of Genoa, the geographical conditions which have almost inevitably determined its history, can be apprehended at a glance. Behind us rise steeply, as has been already said, the hills forming the southernmost zone of the Apennines. This, no doubt, is a defect in a military point of view, because the city is commanded by so many positions of greater elevation; but this defect was less serious in ancient days, when the range of ordnance was comparatively short; while the difficulty of access which these positions presented, and the obstacles which the mountain barrier of the Apennines offered to the advance of an enemy from the comparatively distant plains of Piedmont, rendered the city far more secure than it may at first sight have appeared. Beneath us lies a deeply recessed bay, in outline like the half of an egg, guarded on the east by a projecting shoulder; while on the western side hills descend, at first rapidly, then more gently, to a point which projects yet farther to the south. This eastern shoulder is converted into a kind of peninsula, rudely triangular in shape, by the valley of the Bisagno, a stream of considerable size which thus forms a natural moat for the fortifications on the eastern side of the town. In a bay thus sheltered on three sides by land, vessels were perfectly safe from most of the prevalent winds; and it was only necessary to carry out moles from the western headland and from some point on the eastern shore, to protect them also from storms which might blow from the south. The first defense was run out from the latter side, and still bears the name of the Molo Vecchio; then the port was enlarged, by carrying out another mole from the end of the western headland; this has been greatly extended, so that the town may now be said to possess an inner and an outer harbor. From the parapet of the Corso these topographical facts are seen at a glance, as we look over the tall and densely-massed houses to the busy quays, and the ships which are moored alongside. Such a scene cannot fail to be attractive, and the lighthouse, rising high above the western headland, is less monotonous in outline than is usual with such