Page:The castellated and domestic architecture of Scotland from the twelfth to the eighteenth century (1887) - Volume 1.djvu/137

 YESTER CASTLE 117 FIRST PERIOD The northern wall, or that nearest the point of the triangle, is- a curtain without flanking towers, and without any openings except a small postern door. Returning portions of the east and west curtains branch off from the northern wall.