This day there was to be an unusually low tide, and we had reckoned on enlarging our acquaintance with the bed of the ocean--of knowing a few yards more of the millions of miles lapt in the mystery of waters. It was to be low water about two o'clock, and we resolved to dine upon the sands. But all the morning the children were out playing on the threshold of old Neptune's palace; for in his quieter mood he will, like a fierce mastiff, let children do with him what they will. I gave myself a whole holiday--sometimes the most precious part of my life both for myself and those for whom I labour--and wandered about on the shore, now passing the children, and assailed with a volley of cries and entreaties to look at this one's castle and that one's ditch, now leaving them behind, with what in its ungraduated flatness might well enough personate an endless desert of sand between, over the expanse of which I could imagine them disappearing on a far horizon, whence however a faint occasional cry of excitement and pleasure would reach my ears. The sea was so calm, and the shore so gently sloping, that you could hardly tell where the sand ceased and the sea began--the water sloped to such a thin pellicle, thinner than any knife-edge, upon the shining brown sand, and you saw the sand underneath the water to such a distance out. Yet this depth, which would not drown a red spider, was the ocean. In my mind I followed that bed of shining sand, bared of its hiding waters, out and out, till I was lost in an awful wilderness of chasms, precipices, and mountain-peaks, in whose caverns the sea-serpent may dwell, with his breath of pestilence; the kraken, with "his skaly rind," may there be sleeping "His ancient dreamless, uninvaded sleep," while "faintest sunlights flee About his shadowy sides," as he lies "Battening upon huge seaworms in his sleep."