The seaward aspect of the familiar parts of the island was very interesting to us, and we amused ourselves with guessing what places in the interior were opposite to us when the cliffs hid them from sight. For some distance we passed beneath low cliffs; then the shore took a great curve inward, making the bay we had called by Billy's name; the head of this bay we judged to be the point of the shore nearest to our hut, which was not itself visible from any part of the sea, lying as it did in a hollow. We paddled out to the nearest of the big rocks that stood like sentinels guarding this side of the island, and found a great quantity of clams upon it, some of which Billy insisted on taking into the boat, to see if they tasted any different from those we found on our own shore, and in reaching over he pretty nearly upset the vessel. From thence we went on to the second rock, some little distance out to sea, and Billy wanted to get out and climb the rock, which stood almost perpendicular, but with jagged sides, so that climbing was possible; but the base of it was so thickly covered with slimy seaweed that it would have been difficult to maintain a footing, so I persuaded Billy to forego the enterprise. Leaving this rock, we continued on our course, and came by and by to the rocky spar that was what may be called the land's end of this part of the island. Here the cliffs were very steep, indeed, almost perpendicular, as we had discovered before when we had tried to walk round the coast, and found our way blocked. When we had turned the corner, we found another little bay, but no beach, except a very small strip of sand at the foot of the cliffs. We saw a great quantity of driftwood on this beach, and when we paddled up to it, a huge eel darted away from beneath a water-sodden log, on which Billy made a great lamentation because we had not brought our fishing lines and hooks. Among the driftwood we saw two or three very old planks, worm-eaten and covered with moss, and we wondered whether they were planks of the boat of the _Lovey Susan_, which we might have had now if we had been more thoughtful. We took them on board, not that they would be of any use to us, but that we might keep them as mementoes. [Sidenote: The Cave] Paddling out of this bay, we were coasting along by more high cliffs when we came all of a sudden to an immense opening, which appeared to run a great way into the shore, though we could not tell how far, for its depths were very black. "A cave, master!" cried Billy, full of excitement, and I was excited too, there being I know not what of mystery and fascination about a cave. "Let us go in," says he.