Suddenly she bethought her of a cavern in the rocks known as the Pixies' Hole, which her brother Denzil had often explored--a gloomy place, the haunt at times of the seal and of the _zart_, as old Cornish folks called the sea-urchin. It was one of those great caverns in which, in the barbarous times of old, the Cornish men took shelter from the Romans and Saxons, just as the children of Israel did from the Midianites in the dens of the mountains; and there, by local superstition, still abode, unscared by the whistle of the adjacent railway, certain little beings known as the Pixies, who came hither from Devonshire on dark nights, mounted on the farmers' horses, and were heard to sing in its recesses while pounding their cider. Gathering her skirts again, the poor girl dashed through the water, and ere long reaching the mouth of the cavern, clambered in breathlessly, falling, the while, more than once on her tender hands, when her feet slipped, on the glassy surface of the sea-weedy rocks and stones, which covered all the ascent to this gaunt and gloomy place of refuge. She knew that it penetrated far inland, and hoped that there for a time she should be safe; but there would be hours of darkness, cold, and captivity to endure, ere the ebb of the tide would permit her to escape, and by that time what must be the terror of her poor mamma! When fairly within this place her courage rose a little, for she saw that it closely resembled a grotto she had frequently visited and sketched--the Cave of Porthmellin. The floor of this great fissure in the rocks ascended at an angle from the shore, mid as the tide advanced, Sybil found herself compelled to retire further and further still, inward and upward amid its dreary uncertainties, while the rising tide, now rolling into the bay with the full force of a west wind, began to surge with a sound as of thunder, about the mouth by which she had entered, and that orifice seemed to lessen rapidly as the water rose within it. The roar of the sea woke a hundred weird echoes amid the impenetrable gloom beyond her; while the view outward from the point now attained by the breathless and affrighted girl, for a time proved strange and, to her artistic eye, full of wonderful effects. The walls of rock were dark, and yet so polished by time and the seas of ages as to emit reflected light, and to reveal little pools of crystal water lying still and motionless in fissures and crevices, where star-fish, shells, and hermit-crabs had been left by the last ebb-tide. With growing terror Sybil could perceive that by each successive wave the mouth of her refuge grew smaller, and it was evident that ere long it would be covered by the sea, while she should be shut within!