The first halting-place in Tuesday’s excursion was Prudhoe Castle, where the archæologists were met by Lord Percy and by Mr. G. Clark, by the latter of whom the fabric was described in detail. Mr. Clark pointed out _seriatim_ the barbican and the entrance gate, of late Norman work, with the chapel over the latter. This was carefully inspected by all the party, though its access, being at the top of a steep staircase, was not of the easiest. Passing on, the party were shown the remains of the keep, the line of ramparts, with staircases in the walls, the inner and outer baily, and the castle ditch or moat, once full of water, but now nearly dry. Mr. Clark also explained the points in which the strength of the castle as a military fortress consisted, and spoke at considerable length about the De Vescis, the Umfravilles, and former lords. Many of the members present remarked on the obvious resemblance between the north front of Prudhoe Castle and the north terrace at Windsor Castle, with the level fields lying at its foot and reaching to the Tyne, just as the Home Park at Windsor reaches to the Thames. Upon leaving Prudhoe the party went on foot to the parish church of Ovingham, where the Norman architecture was examined. The other places which they visited were the church of St. Peter and St. Andrew, at Bywell, and the still more interesting church and peel tower at Corbridge, and, lastly, the border fortress of Aydon, a most remarkable and picturesque building, now used as a farmhouse. It was built at the close of the thirteenth century, and is an excellent specimen of a building which, like so many on the Scottish border, was at once a mansion and a fortified stronghold. The building is surrounded by an outer wall, pierced with arrow-holes, and enclosing three courtyards. The wall is surrounded on three sides by a shallow ditch, while on the fourth it is protected by a deep ravine. The building in former days was entered by an external staircase, which was covered from above. Over the chimneys in one of the rooms are the arms of the Carnabies, its former owners. From the walls of Aydon the party were able to obtain a fine view over the valley of Hexham; and they left the place with expressions of great regret that both Hexham Abbey and Dilston Castle had been obliged to be left out of the society’s programme. Corbridge, an old town, once large and flourishing, but now reduced to much smaller dimensions, and having only one church instead of four, was the last on the programme of the day. The small square peel tower in the market-place, formerly used as a gaol; the market cross, erected on the site of an older one by the Duke of Northumberland in 1814; and the fine old stone bridge across the Tyne, with its span of seven arches--the only bridge which resisted the great flood of 1771--were in turn inspected by the party, who then returned to Newcastle. In the evening the general concluding meeting was