On one of these expeditions we sailed round to the north side of the island, and it came into our heads to see whether it was possible to make an ascent of the big red rock, the sides of which, so far as we had been able to examine them from the cliffs and the hills, appeared to be unscalable. We took care not to let our vessel drift into the current that ran between the rock and the island, and running round to the north side of it, we found that it was not near so precipitous here as on the other sides--indeed, there was a very convenient landing-place at the foot, and a little cove where the vessel might safely lie, tied by the painter to a crag, while we satisfied our curiosity by making the ascent. You may be sure that we tied the vessel up very securely before leaving her, for if she had drifted loose I do not know what we should have done, for we could scarcely have swum to the island, the current being so strong, and I suppose we should simply have stayed on the rock until we were dead. There was no pathway up the rock, on which we were perhaps the first human beings that had ever set foot, and we found the ascent a great deal more difficult than it had appeared from below. We had to clamber up from point to point with the aid sometimes of stunted bushes--very sturdy they were, too--that grew out of fissures; and choosing the easiest way, we made a very zigzag course, sometimes losing sight of the sea altogether. Here and there we disturbed sea-birds which had made their nests in the face of the cliff, but there were not near so many of these as we might have expected. After climbing thus for about three hundred feet, as I calculated, we came to a sort of broad terrace that ran in a fairly easy slope round the northern and eastern faces of the rock, and pretty well covered with shrubs and moss. From this we made our way, rather laboriously, to the southern side, and came by and by to the ledge, or platform, which jutted out from the rock to the island, and which I mentioned a while ago. Billy, you remember, had spoke of leaping the gap, which would have been an impossible feat, for not only was the distance too great, it being, I should think, at least twenty feet, but, moreover, the ledge on the rock was somewhat higher than the promontory of the island. Looking down upon this latter as we now did, the gap seemed even less than it had appeared from the other side, and I had really to be very stern with Billy when he declared again that he knew he could jump it.