they dip beneath the sea-level, and become salt-water lochs. The lines of hills that rise over them jut out as promontories, till cut off by some transverse valley, lowered still more deeply into the brine, and that exists as a kyle, minch, or sound, swept twice every tide by powerful currents. The sea deepens as the plain slopes downward; mountainchains stand up out of the water as larger islands, single mountains as smaller ones, lower eminences as mere groups of pointed rocks; till at length, as we pass outwards, all trace of the submerged land disappears, and the wide ocean stretches out and away its unfathomable depths. The model of some Alpine country raised in plaster on a flat board, and tilted slantways, at a low angle, into a basin of water, would exhibit, on a minute scale, an appearance exactly similar to that presented by the western coast of Scotland and the Hebrides. The water would rise along the hollows, longitudinal and transverse, forming sounds. and lochs, and surround, island-like, the more deeply submerged eminences. But an examination of the geology of the coast, with its promontories and islands, communicates a different idea. These islands and promontories prove to be of very various ages and origin. The outer Hebrides may have existed as the inner skeleton of some ancient country, contemporary with the main land, and that bore on its upper soils the productions of perished creations, at a time when by much the larger portion of the inner Hebrides, Skye, and Mull, and the Small Isles, existed as part of the bottom of a wide sound, inhabited by the Cephalopoda and Enaliosaurians of the Lias and the Oölite. Judging from its components, the Long Island, like the Lammermoors and the Grampians, may have been smiling to the sun when the Alps and the Himalaya Mountains lay buried in the abyss; whereas the greater part of Skye and Mull must have been, like these vast mountain-chains of

the Continent, an oozy sea-floor, over which the ligneous productions of the neighboring lands, washed down by the streams, grew heavy and sank, and on which the belemnite dropped its spindle and the ammonite its shell. The idea imparted of old Scotland to the geologist here, of Scotland, proudly, aristocratically, supereminently old, — for it can call Mont Blanc a mere upstart, and Dhawalageri, with its twenty-eight thousand feet of elevation, a heady fellow of yesterday, is not that of a land settling down by the head, like a foundering vessel, but of a land whose hills and islands, like its great aristocratic families, have arisen from the level in very various ages, and under the operation of circumstances essentially diverse.

We left behind us the islands of Lunga, Luing, and Seil, and entered the narrow Sound of Kerrera, with its border of Old Red conglomerate resting on the clay-slate of the district. We had passed Esdaile near enough to see the workmen employed in the quarries of the island, so extensively known in commerce for their roofing slate, and several small vessels beside them, engaged in loading; and now we had got a step higher in the geological scale, and could mark from the deck the peculiar character of the conglomerate, which, in cliffs washed by the sea, when the binding matrix is softer than the pebbles which it encloses, roughens, instead of being polished, by the action of the waves, and which, along the eastern side of the Sound here, seems as if formed of cannon-shot, of all sizes, embedded in cement. The Sound terminates in the beautiful bay of Oban, so quiet and sheltered, with its two island breakwaters in front, its semicircular sweep of hill behind,its long white-walled village, bent like a bow, to conform to the inflection of the shore, its mural precipices behind, tapestried with ivy, its rich patches of green pasture, its bosky dingles of shrub and tree, — and, perched on the

seaward promontory, its old, time-eaten keep. "In one part of the harbor of Oban," says Dr. James Anderson, in his "Practical Treatise on Peat Moss," (1794), "where the depth of the sea is about twenty fathoms, the bottom is found to consist of quick peat, which affords no safe anchorage." I made inquiry at the captain of the steamer, regarding this submerged deposit, but he had never heard of it. There are, however, many such on the coasts of both Britain and Ireland. We staid at Oban for several hours, waiting the arrival of the Fort William steamer; and, taking out hammer and chisel from my bag, I stepped ashore to question my ancient acquaintance, the Old Red conglomerate, and was fortunate enough to meet on the pier-head, as I landed, one of the best of companions for assisting in such work, Mr. Colin Elder, of Isle Ornsay,the gentleman who had so kindly furnished my friend Mr. Swanson with an asylum for his family, when there was no longer a home for them in Small Isles. "You are much in luck," he said, after our first greeting: "one of the villagers, in improving his garden, has just made a cut for some fifteen or twenty yards along the face of the precipice behind the village, and laid open the line of junction between the conglomerate and the clay-slate. Let us go and see it."

I found several things worthy of notice in the chance section to which I was thus introduced. The conglomerate lies uncomformably along the edges of the slate strata, which present under it an appearance exactly similar to that which they exhibit under the rolled stones and shingle of the neighboring shore, where we find them laid bare beside the harbor, for several hundred yards. And, mixed with the pebbles of various character and origin of which the conglomerate is mainly composed, we see detached masses of the slate, that still exhibit on their edges the

identical lines of fracture characteristic of the rock, which they received, when torn from the mass below, myriads of ages before. In the incalculably remote period in which the conglomerate base of the Old Red Sandstone was formed, the clay-slate of this district had been exactly the same sort of rock that it is now. Some long anterior convulsion had upturned its strata, and the sweep of water, mingled with broken fragments of stone, had worn smooth the exposed edges, just as a similar agency wears the edges exposed at the present time. Quarries might have been opened in this rock, as now, for a roofing-slate, had there been quarriers to open them, or houses to roof over; it was in every respect as ancient a looking stone then as in the present late age of the world. There are no sermons that seem stranger or more impressive to one who has acquired just a little of the language in which they are preached, than those which, according to the poet, are to be found in stones; a bit of fractured slate, embedded among a mass of rounded pebbles, proves voluble with ideas of a kind almost too large for the mind of man to grasp. The eternity that hath passed is an ocean without a further shore, and a finite conception may in vain attempt to span it over. But from the beach, strewed with wrecks, on which we stand to contemplate it, we see far out towards the cloudy horizon, many a dim islet and many a pinnacled rock, the sepulchres of successive eras, the monuments of consecutive creations: the entire prospect is studded over with these landmarks of a hoar antiquity, which, measuring out space from space, constitute the vast whole a province of time; nor can the eye reach to the open, shoreless infinitude beyond, in which only God existed; and, as in a sea-scene in nature, in which headland stretches dim and blue beyond headland, and islet beyond islet, the distance seems not lessened, but increased, by the crowded

objects we borrow a larger, not a smaller idea of the distant eternity, from the vastness of the measured periods that occur between.

Over the lower bed of conglomerate, which here, as on the east coast, is of great thickness, we find a bed of gray stratified clay, containing a few calcareo-argillaceous nodules. The conglomerate cliffs to the north of the village present appearances highly interesting to the geologist. Rising in a long wall within the pleasure-grounds of Dunolly castle, we find them wooded atop and at the base; while immediately at their feet there stretches out a grassy lawn, traversed by the road from the village to the castle, which sinks with a gradual slope into the existing sea-beach, but which ages ago must have been a sea-beach itself. We see the bases of the precipices hollowed and worn, with all their rents and crevices widened into caves; and mark, at a picturesque angle of the rock, what must have been once an insulated sea-stack, some thirty or forty feet in height, standing up from amid the rank grass, as at one time it stood up from amid the waves. Tufts of fern and sprays of ivy bristle from its sides, once roughened by the serrated kelp-weed and the tangle. The Highlanders call it M'Dougal's Dog-stone, and say that the old chieftains of Lorne made use of it as a post to which to fasten their dogs, animals wild and gigantic as themselves, when the hunters were gathering to rendezvous, and the impatient beagles struggled to break away and begin the chase on their own behalf. It owes its existence as a stack-for the precipice in which it was once included has receded from around it for yards to an immense boulder in its base-by far the largest stone I ever saw in an Old Red conglomerate. The mass is of a rudely rhomboidal form, and measures nearly twelve feet in the line of its largest diagonal. A second huge pebble in the same