Now and then there would be a fight up there, and white eggs would roll over the edge and splash yellow upon the turf.  Wherever the rocks became a little less precipitous, they were fairly lined with the birds and hoary with their whitewash.

After Simeon had charged his gun, the children proceeded to explore the caves, innocently taking each other’s hands, and advancing by the light of a candle—­which, with flint and steel, they had found in the locker of their boat.

First they had to cross a pool, not deep, but splashy and unpleasant.  Then more perilously they made their way along the edges of the water, walking carefully upon the slippery stones, wet with the clammy, contracted breath of the cave.  Soon, however, the cavern opened out into a wider and drier place, till they seemed to be fairly under the mass of the island; for the cliffs, rising in three hundred feet of solid rock above their heads, stretched away before them black and grim to the earth’s very centre.

Anna cried out, “Oh, I cannot breathe!  Let us go back!”

But the undaunted Simeon, determined to establish his masculine superiority once for all, denied her plumply.

“We shall go back none,” he said, “till we have finished this candle.”

So, clasping more tightly her knight-errant’s hand, Anna sighed, and resigned herself for once to the unaccustomed pleasure of doing as she was bid.

Deeper and deeper they went into the cleft of the rocks, stopping sometimes to listen, and hearing nothing but the beating of their own hearts when they did so.

There came sometimes, however, mysterious noises, as though the fairy folks were playing pipes in the stony knolls, of which they had both heard often enough.  And also by whiles they heard a thing far more awful—­a plunge as of a great sea-beast sinking suddenly into deep water.

“Suppose that it is some sea-monster,” said Anna with eyes on fire; for the unwonted darkness had changed her, so that she took readily enough her orders from the less imaginative boy—­whereas, under the broad light of day, she never dreamed of doing other than giving them.

Once they had a narrow escape.  It happened that Simeon was leading and holding Anna by the hand, for they had been steadily climbing upwards for some time.  The footing of the cave was of smooth sand, very restful and pleasing to the feet.  Simeon was holding up the candle and looking before him, when suddenly his foot went down into nothing.  He would have fallen forward, but that Anna, putting all her force into the pull, drew him back.  The candle, however, fell from his hand and rolled unharmed to the edge of a well, where it lay still burning.

Simeon seized it, and the two children, kneeling upon the rocky side, looked over into a deep hole, which seemed, so far as the taper would throw its feeble rays downwards, to be quite fathomless.

But at the bottom something rose and fell with a deep roaring sound, as regular as a beast breathing.  It had a most terrifying effect to hear that measured roaring deep in the bowels of the earth, and at each respiration to see the suck of the air blow the candle-flame about.