I have not yet mentioned the roofs. In those which I was able to examine, they are covered with slabs of stone, supported from the stone roofs without any use of timber whatever. The ridges are also of stone, elaborately carved, and the whole construction seems to be as imperishable in its scheme as anything I know of the kind. The churches of the Auvergnat type present so little variety, and were built within so short a space of time, that a description of each of them in succession would be wearisome. Of course there are some variations. S. Amable at Riom, for instance, has the main arches pointed, whilst the triforium arcade is round-arched, and the vault of the nave is also pointed instead of round. The vault of the nave of Issoire is another example of a pointed vault. At S. Nectaire the usual piers in the nave have given way to columns. At Brioude, the style reached its perfection, and, indeed, I know few effects more striking in every way than that of the aisles round the choir; the roof, constructed as a regular barrel-vault and without any ribs, seems to be true in principle, and to carry the eye on even more agreeably than our ordinary Gothic vaulting of circular aisles, in which the eye is often distracted by numbers of conflicting lines of ribs. The wall arcades between the chapels recall the peculiar form of trefoil to which I have before had to refer, and it is again met in the triforium of the south side of Notre-Dame-du-Port. The doorways appear to be of two kinds; one enriched with sculpture, the other with inlaid work. Of the former the south door of Notre-Dame-du-Port is a fine example. The opening is square, covered with a pediment-like lintel, on which are sculptured in low relief the Adoration of the Magi, the Presentation in the Temple, and the Baptism of our Lord. Above the lintel is a round arch, under which is a figure of our Lord, seated, with a seraph on either side. Against the wall, below the lintel on each side of the door, are figures of Isaiah and S. John the Baptist. In the much-altered church at Mozat,[56] near Riom, is a door of a somewhat similar kind, and both are very like the doorway in the north transept of Le Puy. At S. Nectaire is an example of a door with the tympanum filled in with mosaic.