One of the most remarkable features in the conformation of Inishmore is, that between the overlapping strata or terraces of limestone, thirty-seven feet in thickness in some places and eighteen in others, are beds of shale. The highest of the terraces is 320 feet over high-water mark, on the perpendicular cliff overlooking the Atlantic. On the sixth lowest of these descending steps the village of Kilronan, the capital of the island, over against the Galway bay, is built, and under that terrace and over the seventh is a shale bed which contains the water supply for the glebe and upper village wells. [Sidenote: BOULDERS.] Those who delight in geological speculations will find in these isles much to interest them. Here are deep furrows in the hard rocks, cut as they say by passing icebergs. One of these ice-cut furrows may be seen near the shore of Killeany Bay, about two hundred yards north-east of Lough Atalia, and a quarter of a mile from Kilronan. It is about seven yards long, nearly a yard wide, having a bearing of east by north. Though the icebergs have left their striæ, and though their passage is marked by the deep furrows cut by them as they moved, nevertheless the patches of boulder drift on the surface are few; but the bergs in their passage from the north district did drop some huge metamorphic rocks, not one of which is indigenous, so to speak, to the islands, but have been carried from a district such as that of Oughterard. Strange that some limestone boulders have also been dropped, carried from some far-off limestone district. These boulders have withstood the wreck of ages, but the weather-beaten rocks under them are so worn as here and there to present the appearance of pedestals bearing up the superincumbent masses. Whilst there is much to arrest the attention as you look from the hotel windows towards Galway over the Galway bay, bounded on the north by the grotesque desolation of the Connemara mountains, and on the south by the rocky mountains of the county of Clare, it is on the south-west side of the islands of Aran that the scene is awfully sublime, terrific, and impressive--rendered more awful by reason of the confusion of the waters and of the roaring of the waves of the sea. The heavy swell of the Atlantic there rolls in angry billows against the cliffs dark and perpendicular, hundreds of feet in height--cliffs perforated by winding caverns worn by the violence of the waves, from one of which, having an aperture in the surface, was projected a column of water to the height of a ship's mast. Whilst many of these cliffs rise perpendicularly from the ocean, many of them have sea terraces or steps at foot below the high-water mark. At _Illaun-a-naur_, on the south-easterly side of the great island, are sea-terraced cliffs which are fendered by a rampart formed of enormous blocks of limestone upheaved from the depths of the ocean and hurled with violence on the rampart which now forms a foot barrier against the