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to side, like a beam in a modern house. At a distance of four feet three inches another beam spans the walls. From this a dome roof is raised by overlapping stones, terminating in a cap, and giving the roof the appearance of a flattish beehive. The height from the floor to the middle of the centre beam, which is lower at the inner end, is five feet, to the next beam five feet nine inches, to the point of the dome seven feet, and to the surface of the ground ten feet. The walls are built of undressed moorstone, and gradually converge as they rise. The height of the house from the base of the wall to the spring of the arch is five feet, the breadth at the floor five feet eight inches, and at the curve of the dome four feet eight inches. The convergence is therefore one in ten for each side.

There are four recesses in the walls, one in the inner and three in the outer curve. Evidently these were used as receptacles by the inmates of the dwelling. They are about four feet from the floor, and of the following dimensions: No. I, 1-6 X 1-8 X 0-10; No. II, 2-2 x 1-7 X 0-10; No. Ill, 2-2 x 2-2 x 1-4; and No. IV, 1-10 X 1-10 X 1-0.

The entrance is upon the inner wall, near the middle. It is two feet ten inches high, two feet ten inches broad at the bottom, narrowing as it rises to two feet two inches at the top. The wall is two feet six inches thick, beyond which the passage ia blocked up with sessile sand and loose stones.

From the curved end, a few inches above the floor, a triangular stone projects a foot or thereby, and close to this one or two other smaller stones. Possibly these stones were intended for seats; but I am more inclined to think that they are simply accidental projections in the foundation.

This underground structure then is a regular curved gallery, five feet high, four feet eight inches wide above, five feet eight inches broad below, and twenty feet long. The form and position of it struck me as peculiar and different from any other hypogeum that has come under my notice. That which seems to me to resemble it most, and of which Captain Thomas, R.N., has sent me a tracing, is at Rait, Badenoch. It is on the property which belonged to James Macpherson, of "Ossian " celebrity, and was described by Macpherson's son-in-law, Sir David Brewster.

This house is in a long broad ridge of the field, about ninety yards from the shore, sixty from the level of the land, and twenty feet above the level of the sea. The vertical section of sand over the roof contains many large periwinkles, limpets, and other shells, that could not have been blown there by the wind; consequently this cannot be drift sand. I therefore suppose that a hollow pit was dug out of the face of the ridge, that

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