Fig. 244.—Defensive structure on an island in the Loch of Hogsetter, Whalsay, Shetland. (From a Sketch Plan by Dr. Arthur Mitchell.)
In the Loch of Hogsetter, in the island of Whalsay, in Shetland, there is a small island containing a defensive structure of dry-built masonry (Fig. [244]) which is plainly not a Broch.[[93]] The structure occupies the greater part of the available surface of the island, and its form has evidently been determined by the form of the island. It consists of a dry-built wall of stones with a minimum thickness of 3 to 4 feet, enclosing an oblong oval of about 70 feet by 75 feet. A causeway, 33 yards in length, has been constructed to give access to the island from the shore, and on the side next the causeway the enclosing wall is amplified so as to admit of the construction of a doorway, flanked on each side by a chamber, as seen in the detached work protecting the entrance to the island of Clickamin. This part of the construction is solidly built, and the chambers, which are placed to right and left of the entrance passage, occupy the interior of a somewhat rectangular expansion of the wall, measuring about 20 feet by 12 feet, and now only about 8 feet high. When Low visited Whalsay in 1774, this part of the construction was 15 feet high, and the chambers and their entrances were quite entire. They were beehive roofed, the entrances going straight through the back wall from the enclosed area. The main entrance, which was 2½ feet wide and 4½ feet high, was covered by the masonry which joined the two sides of the construction over its lintels, and at about two-thirds of its length inwards there were checks for a door and the usual bar-holes on either side. Dr. Mitchell states that above the two lower chambers there appear to have been other two forming a second tier, but as Low did not observe them, and no trace of a stair or other access to the upper level now remains, it seems possible that they may have been chambers of construction, or merely vacancies left to lighten the weight on the roofs of the chambers below. Apart from the peculiarity of its chambers, which are unlike the guard-chambers of the Brochs in having their entrances opening to the enclosed space and not directly opening into the passage, this structure has more affinities with the stone cashels than with the Brochs. Like them it adapts its form to the space in which it is situated, and like them it consists of a simple rampart with cells in the thickness of the wall. The wall is low, and of no great strength, and like the wall of a cashel is merely meant to add to the defensibility of a naturally defensive position. The special peculiarities of this defensive construction are, that it is a dry-built structure which is not a Broch but a cashel, and that it is situated on an island in a loch and rendered accessible by a causeway. The island is of natural formation, and has been thus utilised, because of its suitability for defensive purposes.
Such instances of the adaptation of natural islands in lochs as places of strength by constructing defensive buildings of stone upon them are not uncommon, although it rarely happens that the form and characteristics of the buildings themselves are so clearly traceable. But there is another variety of defensive construction which is more frequently found in similar positions. It possesses the additional peculiarity of being either wholly or partially constructed of wood.
The Lake-Dwellings in Scotland, which are either wholly or partially constructed of wood, and which on that account are known as Crannogs, are very numerous, but so few of them have yet been systematically explored that it is impossible to determine with any degree of certainty the special characteristics of their typical form and structural arrangements. Indeed, it is questionable whether this knowledge may be in any measure attainable by investigation of their existing remains. Constructed of perishable material, which, as long as it survived the ravages of time, was capable of being adapted to many and various purposes of general utility, the parts of the Crannogs that stood above the water were almost certain to be gradually destroyed. But whatever may have been the special form of the superstructure of the Lake-Dwelling when it was built of timber instead of stone, the typical Crannog, taken as a whole, differs from the stone-built strengths that are placed in lakes not only in the substitution of timber in place of stone as the material of its construction, but also in being constructed usually on an island that is itself an artificial construction. The Crannog is therefore a Lake-Dwelling, actually built up from the lake-bottom. Of the structure which stood above the water, and gave shelter and habitable houseroom to the inmates, there is usually no trace whatever. Occasionally the remains of a pavement of timber or of flagstones, or the site of a hearth with its accumulations of ashes and food refuse marks the level of the floor, and sometimes a succession of such indications at different levels may betoken successive occupations. But the story of the Crannog as told by the casual relics imbedded in and around its submerged foundations is clearly intelligible, although it reveals nothing of the precise form and arrangements of the habitable part of the structure.
In the Loch of Dowalton, situated in the centre of the peninsula, bounded on the west by the Bay of Luce, and on the east by the Bay of Wigton, in Wigtonshire, a group of Crannogs was investigated by Earl Percy (then Lord Lovaine) in 1863, and subsequently examined by Sir William Maxwell of Monreith, and the late Dr. John Stuart, then Secretary of the Society of Antiquaries of Scotland. One of these, situated on the south side of the loch and near the west end, presented the appearance of a mass of stones and soil surrounded by numerous rows of piles formed of young oak-trees. On the north-east side of the island a number of beams of oak mortised together like hurdles were visible, and below them layers of round logs laid horizontally. A few vertical piles were observed, which, in some cases, had cross-beams mortised into them. Below the layers of logs were masses of brushwood and fern. The only sign of occupation noticed was the site of a hearth, with an accumulation of ashes, burnt wood, and bones of animals. In the adjacent refuse-heap a small fragment of bronze was discovered, and close by the island a bronze basin was found. Near the eastern margin of the loch was a group of three Crannogs. The largest of these was about 23 yards in diameter. It was surrounded by many rows of piles, some of which had their ends cut square across with a hatchet. The surface of the Crannog was covered with stones resting on a mass of brushwood, fern, and heather, intermingled with stones and earth. The whole mass was penetrated and kept together by piles driven through it into the bottom of the loch. On the south side were the remains of a massive construction of planks of roughly-squared oak, 5 feet long, 2 feet wide, and 2 inches thick, laid side by side in layers crossing each other transversely, and pinned together. The general framework of this platform-like structure was of massive beams mortised together, the mortises measuring about 10 inches by 8 inches. On the north-east side, and underneath part of the timber construction, a canoe was found, 21 feet in length and 3 feet 10 inches wide at the stern. The canoe was of oak, hollowed out of a single tree, and the stern was closed by a board sliding in a groove cut in both sides, and secured by a thicker piece 3 inches in height pegged down over it. A washboard projecting slightly over the edge and pegged into the upper margin of the canoe, ran all round the sides.
Fig. 245.—Portion of a Shoe of stamped leather (length, 7 inches). There were two thole-pins inserted in square holes on each side, and one of the thwarts remained in position. A portion of a shoe formed of stamped leather (Fig. [245]) was discovered among the mass of material thrown out in excavating the canoe. One hearth was discovered. It was simply a paved space, showing marks of fire and an accumulation of ashes and food refuse. The bones were those of the common domestic animals, the ox, the pig, and sheep. Among the relies found on the Crannog were a bronze penannular brooch with knobbed ends, the knobs somewhat quadrangular in form, two iron hammers, and four whetstones.
Fig. 245.—Portion of a Shoe of stamped leather (length, 7 inches).