§ XIV. The old tower is that of St. Mark's at Venice, not a very perfect example, for its top is Renaissance, but as good Renaissance as there is in Venice; and it is fit for our present purpose, because it owes none of its effect to ornament. It is built as simply as it well can be to answer its purpose: no buttresses; no external features whatever, except some huts at the base, and the loggia, afterwards built, which, on purpose, I have not drawn; one bold square mass of brickwork; double walls, with an ascending inclined plane between them, with apertures as small as possible, and these only in necessary places, giving just the light required for ascending the stair or slope, not a ray more; and the weight of the whole relieved only by the double pilasters on the sides, sustaining small arches at the top of the mass, each decorated with the scallop or cockle shell, presently to be noticed as frequent in Renaissance ornament, and here, for once, thoroughly well applied. Then, when the necessary height is reached, the belfry is left open, as in the ordinary Romanesque campanile, only the shafts more slender, but severe and simple, and the whole crowned by as much spire as the tower would carry, to render it more serviceable as a landmark. The arrangement is repeated in numberless campaniles throughout Italy. § XV. The one beside it is one of those of the lately built college at Edinburgh. I have not taken it as worse than many others (just as I have not taken the St. Mark's tower as better than many others); but it happens to compress our British system of tower building into small space. The Venetian tower rises 350 feet,[62] and has no buttresses, though built of brick; the British tower rises 121 feet, and is built of stone, but is supposed to be incapable of standing without two huge buttresses on each angle. The St. Mark's tower has a high sloping roof, but carries it simply, requiring no pinnacles at its angles; the British tower has no visible roof, but has four pinnacles for mere ornament. The Venetian tower has its lightest part at the top, and is massy at the base; the British tower has its lightest part at the base, and shuts up its windows into a mere arrowslit at the top. What the tower was built for at all must therefore, it seems to me, remain a mystery to every beholder; for surely no studious inhabitant of its upper chambers will be conceived to be pursuing his employments by the light of the single chink on each side; and, had it been intended for a belfry, the sound of its bells would have been as effectually prevented from getting out as the light from getting in. § XVI. In connexion with the subject of towers and of superimposition, one other feature, not conveniently to be omitted from our house-building, requires a moment's notice,--the staircase.