heads and rebated jambs without chamfers. On the north side of the nave is a window 3 feet 3 inches high and 8½ inches wide at the outside of the wall with semicircular head. (Figs. 98-100.) The jambs are splayed inwards to 2 feet 9 inches wide. On the south is a similar window. It is to be observed that these windows have no external chamfer--that is, the outer edges of the jambs are acute angles. This peculiarity is found in early Irish churches.[128] They were not originally glazed, but probably had a frame fitted into them, when required, covered with parchment. On this south side are two windows, not original--one close to the east wall and low down, the other high up over the south doorway, (see Fig. 102.) The side walls are about 15 feet 4 inches high from the floor, equal to the internal width of the nave. On the west of the nave is the tower, which is circular, 14 feet 10½ inches diameter externally, and 7 feet 8 inches diameter internally. An arch 2 feet 5 inches wide leads from the nave into it. (Fig. 101.) The jambs are 3 feet 7 inches thick, and the head is semicircular. The tower appears to have been built with the nave, although the stones in the tower are on the average smaller than those in the nave, which difference may be accounted for by the unfitness of large stones, when not freestone, for circular work. [Illustration: FIG. 99.--Church on Egilsey. Section from East to West.] The tower seems to have contained four chambers, including the one on the ground. Above the tower arch, at 16 feet 3 inches from the floor of the nave, but under the nave roof, is an arched opening in the tower 5 feet 4 inches high and 2 feet 3 inches wide. A similar opening is found in many early churches in England, the use of which is not ascertained. Arches in the same position are in St. Magnus. The nave roof appears to have been of a “square pitch”--that is, the angle at the apex is about a right angle. Of the construction of the roof we know nothing, except that it was not vaulted. Probably all the rafters were framed in couples, and the covering formed of coarse slates. Each end of the roof is terminated by a wall 1 foot 2 inches wide, formed of corby-steps, standing up above the roof as usual. The ridge of the roof was about 25 feet above the floor. Above the roof of the nave in the east side of the tower is an arched opening 4 feet 1 inch high and 1 foot 9 inches wide. At about 7 feet above this is a smaller opening in the east side, and similar ones in the three other sides of this story. The top of the tower is now about 11 feet wide, and about 48 feet from the floor of the nave. It is stated that about 15 feet was taken off the top. Probably it was surmounted by a conical roof. [Illustration: FIG. 100.--Church on Egilsey. North Elevation.] On the south side, and near the ground, is a window, but this is a modern work. There is a small window in the second story looking north. (See Fig. 99.)