Almost the only sculptured ornaments worked on the exteriors of buildings were the curious astragal or bead at all the angles, and the cornice, which consisted of a very large cavetto, or hollow moulding, surmounted by a fillet. These features are almost invariable from the earliest to the latest period of the style. This cavetto was generally enriched, over the doorways, with an ornament representing a circular boss with a wing at each side of it. One other feature of Egyptian architecture which was peculiar to it must be mentioned, namely, the obelisk. Obelisks were nearly always erected in pairs in front of the pylons of the temples, and added to the dignity of the entrance. They were invariably monoliths, slightly tapering in outline, carved with the most perfect accuracy; they must have existed originally in very large numbers. Not a few of these have been transported to Europe, and at least twelve are standing in Rome, one is in Paris and one in London. ANALYSIS OF BUILDINGS. The early rock-cut tombs were, of course, only capable of producing internal effects; their floor presents a series of halls and galleries, varying in size and shape, leading one out of the other, and intended by their contrast or combination to produce architectural effect. To this was added in the latter rock-cut tombs a façade to be seen directly in front. Much the same account can be given of the disposition of the built temples. They possess one front, which the spectator approaches, and they are disposed so as to produce varied and impressive interiors, but not to give rise to external display. The supports, such as walls, columns, piers, are all very massive and very close together, so that the only wide open spaces are courtyards. The circle, or octagon, or other polygonal forms do not appear in the plans of Egyptian buildings; but though all the lines are straight, there is a good deal of irregularity in spacing, walls which face one another are not always parallel, and angles which appear to be right angles very often are not so. The later buildings extend over much space. The adjuncts to these buildings, especially the avenues of sphinxes, are planned so as to produce an air of stately grandeur, and in them some degree of external effect is aimed at. The walls are uniformly thick, and often of granite or of stone, though brick is also met with; _e. g._, some of the smaller pyramids are built entirely of brick. In all probability the walls of domestic buildings were to a great extent of brick, and less thick than those of the temples; hence they have all disappeared. The surface of walls, even when of granite, was usually plastered with a thin fine plaster, which was covered by the profuse decoration in color already alluded to.