Ascending the next hill, called Tower Tay, the earth-works are still very conspicuous. About half way up are the ruins of a tower, erected about a century ago, as an object in the landscape. It stands on the Wall, and has been entirely formed out of its stones. At the summit, the ditches of both Wall and Vallum are cut through the native rock, of which the hill consists, and are in excellent order. The Wall stands very near the edge of a scar, sufficiently elevated to have formed of itself a defence; it is remarkable that the Romans should have thought it necessary to draw a ditch on the north side of it at all. Looking forward from the top of this hill, we see, for a considerable distance, all the lines of the Barrier proceeding on their course; descending one hill and ascending the opposite, called the Limestone-bank, they keep perfectly parallel. It would have delighted Horsley’s heart to notice that the present road runs upon the north agger of the Vallum, maintaining, as he did, that this was the Military Way of Agricola. At a short distance, further in advance, the ruins of a mile-castle are seen on the right. The whole of the facing-stones are gone, as is usually the case, and the place where it stood is chiefly marked by the vacuity occasioned by their removal. This castellum measures, inside, fifty-four feet from east to west, and sixty-one from north to south; it has been protected by a fosse. A long range of the Wall is next seen in the Black-carts farm, in an encouraging state of preservation; it is between five and six feet high, and shews, in some places, seven courses of facing-stones. [Sidenote: TEPPER-MOOR.] On the summit of the next hill, many objects of great interest await us. The view from it is most extensive. To the north, a vast sweep of country meets the eye; a beautiful undulated valley occupies the foreground, behind it the hills rise boldly, and the lofty Cheviots bound the scene. Chipchase castle occupies a commanding position. The modern mansion of Nunwick, embowered in wood, selects the lower ground. Towards the west, the lofty crags traversed by the Wall come into view. In the corner of a field adjoining the road, are the remains of another mile-castle; it measures fifty-seven feet by fifty-four. Horsley says, it was detached about a yard from the Wall, the reason of which was not very obvious. A portion of the Roman Military Way may here be seen as it curves towards the gateway of the castellum, and again recedes from it. A good section of it is obtained at the margin of the places where its stones have been removed to form the stone dikes of the field. [Illustration: H. Burdon Richardson, Del. John Storey, Lith. THE WORKS, TEPPER MOOR. ]