The view from the anchoring ground presents some very striking features. Between us and the sea lies Eilean Chaisteil, a rocky trap islet, about half a mile in length by a few hundred yards in breadth; poor in pastures, but peculiarly rich in sea-weed, of which John Stewart used, he informed me, to make finer kelp, ere the trade was put down by act of Parliament, than could be made elsewhere in Eigg. This islet bore, in the remote past, its rude fort or dun, long since sunk into a few grassy mounds; and hence its name. On the landward side rises the island of Eigg proper, resembling in outline two wedges, placed point to point on a board. The centre is occupied by a deep angular gap, from which the ground slopes upward on both sides, till, attaining its extreme height at the opposite ends of the island, it drops suddenly on the sea. In the northern rising ground the wedge-like outline is complete; in the southern one it is somewhat modified by the gigantic Scuir, which rises direct on the apex of the height, _i.e._, the thick part of the wedge; and which, seen bows-on from this point of view, resembles some vast donjon keep, taller, from base to summit, by about a hundred feet, than the dome of St. Paul's. The upper slopes of the island are brown and moory, and present little on which the eye may rest, save a few trap terraces, with rudely columnar fronts; its middle space is mottled with patches of green, and studded with dingy cottages, each of which this morning, just a little before the breakfast hour, had its own blue cloudlet of smoke diffused around it; while along the beach, patches of level sand, alternated with tracts of green bank, or both, give place to stately ranges of basaltic columns, or dingy groups of detached rocks. Immediately in front of the central hollow, as if skilfully introduced, to relieve the tamest part of the prospect, a noble wall of semi-circular columns rises some eighty or a hundred feet over the shore; and on a green slope, directly above, we see the picturesque ruins of the Chapel of St. Donan, one of the disciples of Columba, and the Culdee saint and apostle of the island.
One of the things that first struck me, as I got on deck this morning, was the extreme whiteness of the sand. I could see it gleaming bright through the transparent green of the sea, three fathoms below our keel, and, in a little flat bay directly opposite, it presented almost the appearance of pulverized chalk. A stronger contrast to the dingy trap-rocks around which it lies could scarce be produced, had contrast for effect's sake been the object. On landing on the exposed shelf to which we had fastened our halser, I found the origin of the sand interestingly exhibited. The hollows of the rock, a rough trachyte, with a surface like that of a steel rasp, were filled with handfuls of broken shells thrown up by the surf from the sea-banks beyond: fragments of echini, bits of the valves of razor-fish, the island cyprina, mactridæ, buccinidæ, and fractured periwinkles, lay heaped together in vast abundance. In hollow after hollow, as I passed shorewards, I found the fragments more and more comminuted, just as, in passing along the successive vats of a paper-mill, one finds the linen rags more and more disintegrated by the cylinders; and immediately beyond the inner edge of the shelf, which is of considerable extent, lies the flat bay, the ultimate recipient of the whole, filled to the depth of several feet, and to the extent of several hundred yards, with a pure shell-sand, the greater part of which had been thus washed ashore in handfuls, and ground down by the blended agency of the trachyte and the surf. Once formed, however, in this way it began to receive accessions from the exuviæ of animals that love such localities,--the deep arenaceous bed and soft sand-beach; and these now form no inconsiderable proportion of the entire mass. I found the deposit thickly inhabited by spatangi, razor-fish, gapers, and large, well-conditioned cockles, which seemed to have no idea whatever that they were living amid the debris of a charnel house. Such has been the origin here of a bed of shell-sand, consisting of many thousand tons, and of which at least eighty per cent. was once associated with animal life. And such, I doubt not, is the history of many a calcareous rock in the later secondary formations. There are strata, not a few, of the Cretaceous and Oölitic groups, that would be found--could we but trace their beginnings with a certainty and clearness equal to that with which we can unravel the story of this deposit--to be, like it, elaborations from dead matter, made through the agency of animal secretion.