"The next in order is the largest island. Lord Percy succeeded in reaching it in a boat in 1863. It appeared to him to be 3 feet below the level of the other islands, and, from several depressions on its surface, to have sunk. The progress of excavation was, however, soon checked by the oozing in of the water. On the south side of the island great pains had been taken to secure the structure; heavy slabs of oak, 5 feet long, 2 feet wide, and 2 inches thick, were laid one upon another in a sloping direction, bolted together by stakes inserted in mortises of 8 inches by 10 inches in size, and connected by square pieces of timber 3 feet 8 inches in length. The surface of the island was of stones, resting on a mass of compressed brushwood, below which were branches and stems of small trees, mostly hazel and birch, mingled with stones, apparently for compressing the moss. Below this were layers of brushwood, fern, and heather, intermingled with stones and soil, the whole resting on a bed of fern 3 or 4 feet in thickness. The mass was pinned together by piles driven into the bottom of the loch, some of which went through holes in the horizontal logs. I noticed some of these flat beams of great size and length (one of them 12 feet long), with _three mortise holes_ in the length, 7 inches square. A thick plank of oak of about 6 feet in length had grooves on its two edges, as if for something to slide in. This island measured 23 yards across, and was surrounded by many rows of piles, some of which had the ends cut square over, as if by several strokes of a small hatchet. Vestiges of branches were observed interlaced in the beams of the hurdles. On the north-east side, and under the superstructure of the island (hurdles and planks), a canoe was found, made of a single tree of oak. It was 21 feet in length, 3 feet 10 inches across over all near the stern, which was square. Its depth at the stern was 17 inches, or, including the back-board which closed the stern, 20 inches. The stern was formed by a plank inserted in a groove on each side, with a back-board pegged on above it. The part containing the grooves was left very thick. There were two thole-pins on each side, inserted in squared holes in the solid, which was left to receive them, and wedged in with small bits of wood. One thwart of fir or willow remained. A plank or wash-board projecting a few inches over the edge, ran round the canoe. It rested on the top, and was fastened with pegs into the solid.... "On one spot a few flat stones were placed as if for a hearth. The best saucepan was found between this island and the shore. A small circular brooch of bronze, four whetstones, two iron hammers, and some lumps of iron slag, were found _on_ the island. A third iron hammer was found near it. "The original depth from the surface of the island to the bottom was probably from 6 to 7 feet; but the structure was much dilapidated before I saw it.