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Some of the finest streaks of colour in the stony layers, alternating with the obsidian, can be distinctly seen to be due to an incipient crystallisation of the constituent minerals. The extent to which the minerals have crystallised can, also, be distinctly seen to be connected with the greater or less size, and with the number, of the minute, flattened, crenulated air-cavities or fissures.
So out we went together into the sweet coast-land air, the sweeter for the gale of the night before, and we walked through the old yew-lined paths, and out into the park, and so round the castle, looking up at the gables, the grey pinnacles, the oak-mullioned windows, the ancient wing with its crenulated walls and its meurtriere windows, the modern with its pleasant verandah and veil of honeysuckle.
I could not sleep that night: for all the operations of my mind and body seemed in abeyance. Mechanically I turned the ship westward again; and when the sun came up, there, hardly two miles from me, were the cliffs of Dover; and on the crenulated summit of the Castle I spied the Union Jack hang motionless. I heard eight, nine o'clock strike in the cabin, and I was still at sea.
In command of the Peñon d'Alger, as it was called by the Spaniards, was a valiant and veteran cavalier, by name Martin de Vargas. For twenty years, as we have said, the gold-and-crimson banner of Spain had floated from its crenulated bastions; since the days of Pedro Navarro it had held its own against all comers.
The clouds, which rolled fleecy and white in piles and crenulated bastions of cumulus, lighted the eyes of the man and maid as they went onward upon the crisping piny carpet of fallen fir-needles. "I have never seen Nature so lovely," said Ralph, "as when the bright morning breaks after a night of shower. Everything seems to have been new bathed in freshness."
These fronds have their sinuous edges finely crenulated, and they project over their pedestals or supports; their upper surfaces are either slightly concave, or slightly convex; they are highly polished, and of a dark grey or jet black colour; their form is irregular, generally circular, and from the tenth of an inch to one inch and a half in diameter; their thickness, or amount of their projection from the rock on which they stand, varies much, about a quarter of an inch being perhaps most usual.
But, as a general rule, the fluviatile species are smaller, smoother, and more globular than the marine; and they have never, like the Neritae, the inner margin of the outer lip toothed or crenulated. Potamides cinctus, Sowerby. The Potamides inhabit the mouths of rivers in warm latitudes, and are distinguishable from the marine Cerithia by their orbicular and multispiral opercula.
The lava consists of dark- greyish, harsh rocks, intermediate in character between trachyte and basalt, containing glassy feldspar, olivine, and a little mica, and sometimes amygdaloidal with zeolite: the basis is either quite compact, or crenulated with air-vesicles arranged in laminae.
That some cause does produce parallel zones of less tension in volcanic rocks, during their consolidation, we must admit in the case of the thin alternate layers of obsidian and pumice described by Humboldt, and of the small, flattened, crenulated air-cells in the laminated rocks of Ascension; for on no other principle can we conceive why the confined vapours should through their expansion form air-cells or fibres in separate, parallel planes, instead of irregularly throughout the mass.
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