30. Accepting Lord Lindsay's first reference to Egypt, let us glance at a few of the physical accidents which influenced its types of architecture. The first of these is evidently the capability of carriage of large blocks of stone over perfectly level land. It was possible to roll to their destination along that uninterrupted plain, blocks which could neither by the Greek have been shipped in seaworthy vessels, nor carried over mountain-passes, nor raised except by extraordinary effort to the height of the rock-built fortress or seaward promontory. A small undulation of surface, or embarrassment of road, makes large difference in the portability of masses, and of consequence, in the breadth of the possible intercolumniation, the solidity of the column, and the whole scale of the building. Again, in a hill-country, architecture can be important only by position, in a level country only by bulk. Under the overwhelming mass of mountain-form it is vain to attempt the expression of majesty by size of edifice--the humblest architecture may become important by availing itself of the power of nature, but the mightiest must be crushed in emulating it: the watch-towers of Amalfi are more majestic than the Superga of Piedmont; St. Peter's would look like a toy if built beneath the Alpine cliffs, which yet vouchsafe some communication of their own solemnity to the smallest chalet that glitters among their glades of pine. On the other hand, a small building is in a level country lost, and the impressiveness of bulk proportionably increased; hence the instinct of nations has always led them to the loftiest efforts where the masses of their labor might be seen looming at incalculable distance above the open line of the horizon--hence rose her four square mountains above the flat of Memphis, while the Greek pierced the recesses of Phigaleia with ranges of columns, or crowned the sea-cliffs of Sunium with a single pediment, bright, but not colossal.