Greater art is apparent in the relics of another class of ancient Scottish dwellings occasionally met with in different parts of the country. In the Black Moss, already referred to, on the banks of Etive, Argyleshire, at various points where some advance has been made in recovering the waste for agricultural purposes, the progress of cultivation has uncovered rough oval pavings of stone, bearing marks of fire, and frequently covered with charred ashes. These are generally found to measure about six feet in greatest diameter, and are sometimes surrounded with the remains of pointed hazel stakes or posts, the relics, doubtless, of the upright beams with which the walls of the ancient fabric was framed. Julius Cæsar describes the dwellings of the Britons as similar to those of the Gauls;[92] and these we learn, from the accounts both of Strabo and Diodorus Siculus, were constructed of wood, of a circular form, and with lofty tapering roofs of straw. Such apparently were the structures, the remains of which are now brought to light within the limits of the Dalriadic possessions. These ancient Caledonian hearths, now quenched for so many centuries, are discovered beneath an accumulation of from eight to ten feet of moss, under which lies a stratum of vegetable mould about a foot deep, resting upon an alluvial bed of gravel and sand; the original soil upon which the large sepulchral cairns of the same district have been reared. A discovery made at Dalgenross, near Comrie, in 1823, though described in a communication to the Society of Antiquaries of Scotland as an ancient tomb, manifestly furnishes another example of the same class of primitive dwellings. At Comrie, as in twenty other equally probable localities, antiquaries of the district have pronounced some imperfect and half-obliterated earth-works to be the remains of a Roman camp, and the scene of Agricola's famous victory of Mons Grampius! The writer, learning that workmen were trenching this interesting spot, remarks,--"I hastened to where the men were at work, and found that they had come upon a circle of flat stones set on edge, and at the bottom a paving of large flag-stones. The cavity was filled with a kind of black earth, pieces of charred wood, and also some fragments of iron, but so completely defaced with rust that it is impossible to say to what purpose they have been applied." On pursuing the investigation further, pieces of charcoal and burned wood were found, along with charred wheat, which might possibly suggest its having been a granary; but its general characteristics much more nearly assimilate it to a native dwelling, to which, it may be, the torch of the Roman legionary applied the brand that reduced it to a blackened ruin.