Rosslyn and those of the south of France, but there does not appear to be any connection between them. The pointed barrel vault was the form commonly practised in Scotland in the fifteenth century, both in churches and castles. Mr Fergusson says that this kind of vault is "foreign and unlike the usual form of vaults found in Scotland," but the examples given in this book show that he is mistaken. Pointed barrel vaults are to be found in the churches at Seton, Queensferry, Ladykirk, Whitekirk, Borthwick, Crichton, Corstorphine, Dunglass, and many others, and numerous examples might be given from the castles. There can, therefore, be no doubt that the masons of Scotland were at this period quite familiar with that system of vaulting, some of which, such as the vaults of Borthwick Castle, in the same district and built a little earlier than Rosslyn, are of considerably larger dimensions. The pointed barrel vaults of castle halls and churches are generally covered with sloping stone roofs, as at Bothwell, Borthwick, &c., but at Rosslyn the curved form of the roof has been adhered to, externally as well as internally. The coping of the east gable has been finished to this curve (see Fig. 1077), and there is no indication of any straight roof having been intended. It is possible, however, that it had been originally contemplated to cover the extrados of the choir vault, which still remains unprotected, with an outer stone roof, in accordance with the usual practice; but, owing to the slightness of the clerestory walls, the outer stone roof was omitted in consequence of its great additional weight, which, it may have been believed, would be too great for the side walls to sustain. The roofs of the aisles and east chapels, which are almost flat, are covered with overlapping flags. Until the building was restored some thirty years ago, these parts of the building were covered with a temporary slated roof, which cut off one half of the clerestory windows. The mark of this roof is still visible in the walls.
When we examine smaller details, we find the same methods adopted by the Rosslyn builders as were familiar to the other builders of the country, thus all the lintels or straight arches connecting the main pillars with the side walls, which are such striking features at Rosslyn, are composed of small stones, having radiating joints in the same manner as is frequent in the lintels of the wide fireplaces in the halls of the castles. It may also be noted that the jambs of these fireplaces often terminate in curious moulded caps, often very clumsy, and not unlike the caps of the responds at the east wall of Rosslyn. The plans of the castles sometimes show a series of small parallel apartments, with barrel vaults abutting at right angles upon a passage or wider hall, which may have suggested the parallel barrel vaults of the aisles of Rosslyn. But, indeed, the form of the main arcade itself suggests such an arrangement. The carved canopies and corbels placed on the face of the buttresses and window jambs (see Fig. 1090) are thoroughly characteristic of the Scottish churches
