Page:The castellated and domestic architecture of Scotland from the twelfth to the eighteenth century (1887) - Volume 1.djvu/121

 BOTHWELL CASTLE 101 FIRST PERIOD the parapet, and formed a lofty watch-tower. There is a communica- tion from the donjon (Fig. 75) to passages in the thickness of the south curtain. These contain garde-robes. They also flank the donjon and enfilade the ditch from crosslet loops. The flues from these garde- robes descend in the thickness of the wall, and the arrangement for cleaning them out at the bottom is peculiar. A passage runs from the moat of the donjon through the wall (Fig. 69) where the flues reach the bottom, so that these may be washed out by water let off from the moat. But as the opening in the wall for this purpose might be taken advantage of for gaining access to the moat, the passage is divided, and carried FIG. 77. Both well Castle. Buttress at North- West Angle. round a central pier, which completely blocks the entrance, and renders it impassable (Fig. 73). This arrangement shows that the moat was sometimes supplied with water, and probably explains the use of a large stone supply sink and drain in the north curtain wall. Rain- water from the roofs may have been collected by gutters and led to this trough, or water may have been carted from the exterior and poured