One of the most remarkable groups of cairns in Scotland associated with other primitive monuments, occurs on a small plain washed by the River Nairn, about a mile to the east of the field of Culloden. The whole plain, for upwards of a mile in extent, is covered over with large cairns, encircled by standing stones surrounding them at uniform intervals. Numerous circular groups or "Druidical Temples" occur in the same neighbourhood, with single monoliths and detached circles of small stones, scarcely visible amid the thick covering of grass and heath, but indicating, in all probability, the sites of ancient dwellings of the cairn-builders. An interesting natural chronometer is of frequent occurrence in connexion with these rude memorials of primitive habits, furnishing unmistakable evidence of the remoteness of the era to which they belong, and supplying data which may hereafter prove to be reducible to definite computation. The accumulation, not only of alluvium, but of peat-moss over the structures of early art, has already been referred to in describing the ancient boats, harpoons, &c., discovered in various localities. It will repeatedly recur in the course of our inquiry in relation to various classes of memorials of the past. The traveller, in passing from Bunaw Ferry, on Loch Etive, to Beregonium, Argyleshire, passes over an extensive moor, known by the name of the "Black Moss." On this, or rather rising up through it, are several large cairns, with here and there the remains of others which have been demolished for the purpose of inclosing fields or building cottages. In various parts considerable portions of the moss have been cleared away, exposing, at a depth of from eight to ten feet, the original soil upon which these sepulchral mounds have been reared, and bringing to light other interesting memorials of their builders, hereafter referred to. With such evidence of the slow growth of centuries obliterating the traces of primitive occupation, and effecting such changes on the natural features of the country, it is no vague conjecture which refers to an early era the period when this wild and barren moor was the scene of life and intelligence, and, it may be, of many useful arts. Along with these may be mentioned another group of cairns, including one of unusually large dimensions, not inclosed by the gathered moss of ages, but surrounded by the encroaching tide, on the north shore of the Frith of Beauly, Ross-shire, affording no less striking, though diverse evidence of the remote era to which they belong. In one of these sepulchral urns have been found, leaving no room to doubt of their monumental character. The largest stands about 400 yards within flood-mark; and an ingenious writer in the Philosophical Transactions arrives at the conclusion that an area of fully ten miles square, now flooded by the advancing tide, has once been the site of the dwellings of the ancient cairn-builders. Thus is