defunct oysters and dead buccinidae; and, from their resemblance to lamps cast in the classic model, remind one, in the corners where they have accumulated most thickly, of the old magician's stock in trade, who wiled away the lamp of Aladdin from Aladdin's simple wife. The _Gryphaea obliquita_ and _Gryphaea M'Cullochii_ also occur among these middle strata of the Lias, though much less frequently than the other. We, besides, found in them at least two species of Pecten, with two species of Terebratula,--the one smooth, the other sulcated; a bivalve resembling a Donax; another bivalve, evidently a Gervillia, though apparently of a species not yet described; and the ill-preserved rings of large Ammonites, from ten inches to a foot in diameter. Towards the bottom of the bay the fossils again become more rare, though they re-appear once more in considerable abundance as we pass along its northern side; but in order to acquaint ourselves with the upper organisms of the formation, we have to take boat and explore the northern shores of Pabba. The Lias of Skye has its three distinct groups of fossils: its lower coraline group, in which the Astrea described is most abundant; its middle group, in which the _Gryphaea incurva_ occurs by millions; and its upper group, abounding in Ammonites, Nautili, Pinnae, and Serpulae. Friday made amends for the rains and fogs of its disagreeable predecessor: the morning rose bright and beautiful, with just wind enough to fill, and barely fill, the sail, hoisted high, with miser economy, that not a breath might be lost; and, weighing anchor, and shaking out all our canvass, we bore down on Pabba, to explore. This island, so soft in outline and color, is formidably fenced round by dangerous reefs; and, leaving the Betsey in charge of John Stewart and his companion, to dodge on in the offing, I set out with the minister in our little boat, and landed on the north-eastern side of the island, beside a trap-dyke that served us as a pier. He would be a happy geologist who, with a few thousands to spare, could call Pabba his own. It contains less than a square mile of surface; and a walk of little more than three miles and a half along the line where the waves break at high water brings the traveller back to his starting point; and yet, though thus limited in area, the petrifactions of its shores might of themselves fill a museum. They rise by thousands and tens of thousands on the exposed planes of its sea-washed strata, standing out in bold relief, like sculpturings on ancient tombstones, at once mummies and monuments,--the dead and the carved memorials of the dead. Every rock is a tablet of hieroglyphics, with an ascertained alphabet; every rolled pebble a casket with old pictorial records locked up within. Trap-dykes, beyond comparison finer than those of the Water of Leith, which first suggested to Hutton his theory, stand up like fences over the sedimentary strata, or run out like moles far into the sea. The entire