Page:The castellated and domestic architecture of Scotland from the twelfth to the eighteenth century (1887) - Volume 1.djvu/573

 TULLY ALLAN CASTLE 553 THIRD PERIOD machicolations over both this door and the postern at the east end, by which missiles might be thrown on assailants who might have pene- trated through the outer doors. SECTION THROUGH PORTCULLIS ooo(?wAy Pro. 470. Tullyallan Castle. Section through Principal Entrance and Details of Ground Floor. The plan (Fig. 471) shows that the ground floor was divided into two apartments,, both beautifully vaulted with groined and ribbed arches rest-