chancel. There is a door through the east wall of the north aisle, which possibly led into what may have been a sacristy or vestry. At the west
Fig. 167.—Muthill Church. West Window and Respond.
end of the north aisle there seems to have been a chapel, lighted with a west window.
The windows of the church, of which three remain entire in the south
Fig. 168.—Muthill Church. Plan of Windows in South Aisle.