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BOTHVVELL CASTLE 97 FIRST PERIOD passage is zigzagged for the purpose of defence. It is also provided Fio. 72. Bothwell Castle. Section through Donjon on line C D. with a portcullis, which was worked from a small vaulted chamber above (Fig. 74). The way in which the circular outline of the keep m. OUTSIDE Of S DRAII^ FROM MOAT xMRrv - BOT,TOMlQF STAIR IN DUN JON WELL Fio. 73. Bothwell Castle. Details of Donjon. is broken with a spur to receive the entrance door and portcullis is
