than at the base by about 2½ inches, and the responds taper even more. The latter have no bases, while the centre shafts have only the merest fillet. The south window (Fig. 166) has a square lintel. It is about 3 feet 8½ inches wide by 4 feet 1½ inch high, and has no taper. The opening is divided by a mullion, placed flush with the outer face of the wall. The east window is a single light, about 1 foot 7 inches wide inside, increasing by 2 inches to the outside. It is 3 feet 11 inches high, and is 2 inches wider at the lintel than at the base. We have minutely described these windows, as they are peculiar in their differences, and are undoubtedly original. We know of no reason why the north and west ones should be so much more ornamental than the other two. This tower appears to have stood quite isolated, like that of Dunblane Cathedral. There is nothing to indicate that it was attached to any building. There are no roof ragglets, but only the faintest mark caused by the pointing where the roof of the present ruin joined the walls. What position the tower occupied in regard to the early church, which [Illustration: FIG. 164.--Muthill Church. View of Tower from North-West.] doubtless stood here, cannot now be ascertained. There seems to have been a doorway on the west face of the ground floor (see Fig. 164), about 4 feet wide, formed with a flat arch about 7 feet 6 inches above the present level of the ground; but it is doubtful if the door came to the level of the ground, which seems to have been raised in the course of centuries. A door opened into the church on the east side of the tower. It is about 3 feet wide by 6 feet 2 inches high, and has also a flat arch; but it is not easy to say whether these doors are original or are insertions. In the basement floor on the north and south sides there is a square-headed window, about 7 or 8 feet above the floor. The one on the north side is 12 inches wide by about 1 foot 10 inches high, and is divided by a mullion placed similarly to that in the south belfry window. From the foregoing description, it seems not unlikely that the same ideas which prevailed with the builders of the round towers actuated the men who built this one. It probably contained the bells, and was used as a place of safety detached from the church. The tower is enclosed on three sides by the church. From the east face of the tower the nave measures 46 feet 1 inch in length, and, including the tower, the central aisle of the nave measures 58 feet 10 inches in length by 20 feet 6 inches in width, and the total width inside, including the aisles, is 45 feet 5 inches. The total length of the church inside, including the chancel, is 105 feet 5 inches, and the width of the chancel is 16 feet. [Illustration: FIG. 165.--Muthill Church. Plan and Section of Top Story of Tower.]