Page:The castellated and domestic architecture of Scotland from the twelfth to the eighteenth century (1887) - Volume 1.djvu/417

 RUTHVEN CASTLE - 397 THIRD PERIOD cation is still traceable. This idea looks like a survival of the old /l(lII$ " hirteenth-century mode of fortification, when each tower formed a separate post, and had to be besieged independently. Thus, if one of