Hackpen Hill, 888-ft., is the highest ridge of the Marlborough Downs properly so called, and has already been described in my paper on the Palæoliths found on its summit. The southern hills, overlooking the Pewsey Valley, rise to 965-ft. The top of the hill, hough narrow, is flat, and bears pockets of Tertiary remains, the ub-soil being of a clayey nature almost throughout.

Until recently, five large fields were tilled, and seventeen years ago a sixth was still under the plough. The space covered by these was 1½ miles in length; and on an average, about ⅓ mile in width, two of the fields stretching a little way down the dip slope of the hill.