the low porches, which open from the sea.  Here and there a crooked, twisted tunnel forms a skylight overhead, and the blue heavens look down through it like a far-off eye.  You cannot number the caverns and niches.  Everywhere the sea has bored alleys and galleries, or hewn out solemn aisles, with arches intersecting each other, and running off into capricious furrows and mouldings.  There are innumerable refts, and channels, and crescents, and cupolas, half-finished or only hinted at.  There are chambers of every height and shape, leading into one another by irregular portals, but all rough and rude, as though there might have been an original plan, from which, while the general arrangement is kept, every separate stroke perversely diverged.

But another, and not a secondary, curiosity of this ocean-labyrinth is, that it is the habitat of a multitude of marine creatures, not to be seen at home in many other places.  Except twice a month, at the neaptides, the lower chambers are filled with the sea; and here live and flourish thousands, upon thousands of those mollusks and zoophytes which can exist only in its salt waters.  The sides of the caves, as far as the highest tides swept, were studded with crimson and purple and amber mollusca, glistening like jewels in the light pouring down upon them from the eyelet-openings overhead.  Not the space of a finger-tip was clear.  Above them in the clefts of the rock hung fringes of delicate ferns of the most vivid green, while here and there were nooks and crevices of profound darkness, black with perpetual, unbroken shadow.

I had known the caves well when I was a boy, but it was many years since I had been there.  Now I was alone in them with Olivia, no other human being in sight or sound of us.  I had scarcely eyes for any sight but that of her face, which had grown shy and downcast, and was generally turned away from me.  She would be frightened, I thought, if I spoke to her in that lonesome place, I would wait till we were on the cliffs, in the open eye of day.

She left my side for one moment while I was poking under a stone for a young pieuvre, which had darkened the little pool of water round it with its inky fluid.  I heard her utter an exclamation of delight, and I gave up my pursuit instantly to learn what was giving her pleasure.  She was stooping down to look beneath a low arch, not more than two feet high, and I knelt down beside her.  Beyond lay a straight narrow channel of transparent water, blue from a faint reflected light, with smooth, sculptured walls of rock, clear from mollusca, rising on each side of it.  Level lines of mimic waves rippled monotonously upon it, as if it was stirred by some soft wind which we could not feel.  You could have peopled it with tiny boats flitting across it, or skimming lightly down it.  Tears shone in Olivia’s eyes.

“It reminds me so of a canal in Venice,” she said, in a tremulous voice.

“Do you know Venice?” I asked; and the recollection of her portrait taken in Florence came to my mind.  Well, by-and-by I should have a right to hear about all her wanderings.