In Rosslyn College we have the finest example of the late Scottish forms of vaulting carried out to their fullest extent, together with some exceptional designs. This church differs from most of the other collegiate churches in having side aisles, and also in having groined vaults in the east end. The plan of the latter portion of the building, being copied from the arrangement at the east end of Glasgow Cathedral, has been carried out with groining, in imitation of the original; but in the other parts of the structure the vaulting conforms to that of the third pointed period in Scotland. The main central roof is covered with a continuous pointed barrel vault without a break, except an ornamental rib over each division of the bays. The soffits of each panel of the arch thus formed are carved with stars, fleur-de-lys, and other enrichments. The side aisles are also covered with a series of pointed barrel vaults. Each of these aisle vaults forms an extension of the main pier arch of the choir, carried across the aisle at right angles to the main choir. The Scottish plan of avoiding groins is thus adhered to. The above arrangement of the aisle vaults also enables the aisle windows to be carried up to a good height. The barrel vaults across the aisles rest on flat arches (made to resemble straight lintels), which run between the caps of the main piers and the responds against the walls. The whole construction recalls that of a castle with a large central hall roofed with a barrel vault, and having a series of side chambers entering off it, each covered with its separate barrel vault running at right angles to the main building. If the partitions between these side chambers were removed, and plain arches or lintels substituted, the construction would be exactly that of Rosslyn Church. Such a series of chambers, with barrel vaults running at right angles to a passage, is of common occurrence in the ground floors of the Scottish castles. An exceptional feature connected with the main vault of Rosslyn Church is that the same stones which form the interior arch also form the outside roof--the usual overlapping stone covering being omitted, possibly to avoid the extra weight. The exterior of the roof is thus curved like the interior. During the late pointed period many varieties of details were indulged in. The buttresses are generally somewhat stunted. They are plain and solid, and have often rather elaborate canopies and corbels for statues placed on the front of the buttresses, without recessed niches. The buttresses have frequently numerous set-offs, and are generally finished with stunted square pinnacles having crocketed finials. The windows are almost always pointed, and contain simple tracery derived from the earlier styles. The copying of the forms of the older styles is specially noticeable in the windows and traceries.