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FIRST PERIOD 118 YESTER CASTLE There appear to have been buildings on each side of the central courtyard, with sloping roofs resting against the curtains, the chases for which are seen in the north wall. A piscina or basin is visible in the upper floor of the west wall, with a drain to the outside. The postern Fio. 94. Tester Castle. View of East and North Walls and Subterranean Chamber, looking South. door in the north wall leads to a small open piece of ground at the point of the promontory, on which there may have stood a tower or detached work for defence. The principal gateway was evidently at the south side of the enceinte, and seems to have been defended by two towers ; there is also a round
