There is, on the ground level of the tower, a narrow doorway in the south side, and a wide archway into the church through the east wall. There is also a wide archway in the west wall, opening into what has been a nave, added at a later date; but this opening appears to have been cut through at a late period. The south doorway (Fig. 146) is 2 feet 4 inches wide by about 8 feet high. The soffit of the arch is cut out of single stones. The style of masonry used in the construction of the doorway is peculiar. The thickness of the wall is made up of three courses, the two outer ones being large slabs set on edge, and the interior course being built with smaller stones from a different quarry. The latter are of red and the former of grey sandstone. The outer and inner stones forming the lintel are hollowed out with a semi-circular arch opening. Round the exterior of the doorway there is a raised margin, about eight inches in breadth, with small projection, similar to the margin of the door at Abernethy. Except this ancient feature, there is no other attempt at decoration. The arch in the east wall (Fig. 147) is 8 feet 4 inches wide, and is stated by Mr. Galloway[139] to have been 15 feet 8 inches high from the original floor level to the soffit. The space comprised within the tower [Illustration: FIG. 145.--Restennet Priory. Plan.] was by this archway included in the original church, which opened into it exactly like the archway of the tower at Dunning Church (_q.v._), compared with which, however, this opening has a very archaic appearance. [Illustration: FIG. 146.--Restennet Priory. South Doorway of Tower.] There are no floors in the tower, and no stair or means of access to the upper story, and the tower stands open from the ground to the apex of the spire. Above the arches just described, the tower contains two stories (Fig. 148). In the first story there is a small opening on the east side, about 1 foot 8 inches wide and 4 feet 8 inches high, contained within the space of the choir roof; and on the south side there is another opening, about half this size. A small round opening, a few inches wide, in the west wall (Fig. 149) completes the lights on this story. The highest story, which is separated from the one below by a string course, contains an opening with a straight-sided arch on each face, and each of these openings has an external back-set fillet or margin. How the tower was originally finished it is now impossible to say; but the string course above the second story is the present termination of the original work. The tower has a decided taper of about two feet in the height.