[Illustration: FIG. 57.] But early in the fifteenth century vast structures for private use began to arise which rivalled in scale, and in costly splendour, the great civic monuments of the former time. The first of these larger palaces in Florence is the one now known as the Riccardi, designed by the architect Michelozzi for Cosimo de’ Medici in 1430. It is a princely edifice, and though comparatively plain in general aspect, it is in many ways superior in architectural character to all of those which followed it. Like other buildings of its class it is in plan a survival of the ancient Roman house, having the form of a rectangle enclosing an open court. In elevation (Plate IV) it has two stories over a high basement, and is grandly simple in design, and fine in its proportions. In buildings of this class there is no peculiar internal system which requires attention before the outside can be understood. The apartments have generally flat wooden ceilings, and where vaulting occurs, as usually in the basement and sometimes in the upper stories, it is of a kind that calls for no buttresses against the wall, the thrusts being met by the thickness of the walls, and by the weight of the upper stories. The façades of the Riccardi have no engaged orders, but the great cornice has classic profiling, and its bed mouldings have dentils and other classic details, while modillions of semi-classic form support the corona. The window openings are of thoroughly mediæval character in their larger features, and are each composed of a round arch embracing two smaller arches with a central shaft and jamb shafts, but the shafts have the tapering form with entasis, and the _congé_, of classic design. The capitals are of nondescript form, with a channelled bell, an ovolo with egg and dart ornament, reversed Corinthianesque leafage depending from its angles, and a Corinthian abacus in each. The openings are uniform in each story, and their archivolts are treated in the mediæval Italian manner, the extrados being struck from a higher centre than the intrados. The graduated heights of the stories, and the varied treatment of the wall surfaces by rough-faced rustication in the basement, smooth-faced rustication in the principal story, and smooth close-jointed masonry in the top story, add much to the beauty of this finest of early Renaissance palaces. It is worthy of notice that here, as in the Italian domestic architecture of the Renaissance generally, the roof is not visible in a near view of the building, and no dormers or chimney-stacks appear. The conditions of climate did not call for a high-pitched roof, nor for any of those features that are naturally developed in the architecture of more northern countries. The general outline of the edifice is thus severely simple, and its agreeable effect is due to its fine proportions and arrangement of parts. It is noticeable, too, that the reveals are shallow on the outside, in marked contrast to the deep reveals of