Sixth report and inventory of monuments and constructions in the county of Berwick . Fig. 142.—Bemersyde from the South-east (No. 261). To face p. 148. INVENTORY OF MONUMENTS, ETC., IN COUNTY OF BERWICK. 149 Parish of Mertoun.modern additions. It consists of a rectangular keep (fig. 143) measur-ing some 20 feet by 16 feet 6 inches within walls varying from 6 feet.