Just above the Garden Cove, under the overhanging bluffs, several thousand sea-lions hold exclusive, though shy, possession. Here there is a half-mile of good landing. On the north shore of the island, three miles west from the village, a grand bluff wall of basalt and tufa intercalated rises abruptly from the sea to a sheer height of nine hundred and twenty feet at its reach of greatest elevation: thence, dropping a little, runs clear around the island to Zapadnie, a distance of nearly ten miles, without affording a single passage-way up or down to the sea that thunders at its base. Upon its innumerable narrow shelf-margins, and in its countless chinks and crannies, and back therefrom over an extended area of lava-shingled inland ridges and terraces, millions upon millions of water-fowl breed during the summer months. The general altitude of St. George, though in itself not great, has, however, an average three times higher than that of St. Paul, the elevation of which is quite low, and slopes gently down to the sea east and north; St. George rises abruptly, with exceptional spots for landing. The loftiest summit on St. George, the top of the hill right back to the southward of the village, is nine hundred and thirty feet, and is called by the natives Ahluckeyak. That on St. Paul, as I have before said, is Bogaslov Hill, six hundred feet. All elevations on either island, fifteen or twenty feet above sea-level, are rough and hummocky, with the exception of those sand-dune tracts at St. Paul and the summits of the cinder hills, on both islands. Weathered out, or washed from the basalt and pockets of olivine on either island, are aggregates of augite, seen most abundant on the summit slopes of Ahluckeyak Hill, St. George. Specimens from stratified bands of old, friable, gray lavas, so conspicuous on the shore of this latter island, show an existence of hornblende and vitreous felspar in considerable quantity, while on the south shore, near Garden Cove, is a large dike of a bluish and greenish gray phonolite, in which numerous small crystals of spinel are found. A dike, with well-defined walls, of old close-grained, clay-colored lava, is near the village of St. George, about a quarter of a mile east from the landing, in the face of those reddish breccia bluffs that rise from the sea. It is the only example of the kind on the islands. The bases or foundations of the Pribylov Islands are, all of them, basaltic; some are compact and grayish-white, but most of them exceedingly porous and ferruginous.[100] Upon this solid floor are many hills of brown and red tufa, cinder-heaps, etc. Polavina Sopka, the second point in elevation on St. Paul Island, is almost entirely built up of red scoria and breccia; so is Ahluckeyak Hill, on St. George, and the cap to the high bluffs opposite. The village hill at St. Paul, Cone hill, the Einahnuhto peaks, Crater Hill, North Hill, and Little Polavina are all ash-heaps of this character. The bluffs