are placed, while the others were filled with statues of deities, now replaced by Romish altars. They are decorated with pilasters, and two Corinthian columns stand in front of each, supporting the entablature which runs round the whole interior. Between the eight principal niches are eight smaller ones, now used as altars, faced with ædiculæ consisting of two small columns with entablature and pediment. The two ring cornices in the interior answer in position to the lower exterior cornices. Above the upper cornice which runs quite round the building there were originally twelve niches surrounded with elegant marbles and stucco work. These were altered in 1747, and their effect injured by the introduction of heavy pediments, and by the removal of the marbles and stucco work. The interior of the roof is relieved by well-designed rectangular coffer work, decreasing in size towards the apex of the dome so as to give the impression of height and space. The floor is laid with slabs of Phrygian and Numidian marble, porphyry, and grey granite, in alternate squares and circles, set in reticulated work. In the centre it has a depression pierced with small holes to carry off the rain water from the aperture above. This drain probably communicated with the great cloaca built by Agrippa to drain the Campus Martius. The proportions of the interior of the dome are admirably adjusted, so that no part of the building has an undue prominence, contrasting favourably in this respect with S. Peter’s, where the immense size of the piers on which the dome is supported dwarf the upper part too much. The Pantheon will always be reckoned among the masterpieces of architecture for solid durability combined with beauty of interior effect. The Romans prided themselves greatly upon it as one of the wonders of their great capital, and no other dome of antiquity could rival its colossal dimensions.[93] The height from the pavement to the crown of the dome is 143 feet, half of which is occupied by the cylindrical wall and half by the dome; this height is insignificant when compared with S. Peter’s, the dome of which is 405 feet from the pavement to the base of the lantern, and the exterior appearance of S. Peter’s is far finer, but the diameter of the Pantheon is the greater, and the proportions of the interior more harmonious.