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Rh ledge, often uncomfortably near to the edge of it, and at last gets round a corner, out of my sight. The parents, as far as I can make out, have not followed it. This is quite a new development in my experience of the chick, if not in the chick's own experience. It is not, then, quite immovable, till it flies or is carried down. Were it to fall now, how aptly would it illustrate that law of natural selection which I have called in to account for its general quiescence. I hope it won't though—which is to my credit surely.

I note one more thing before leaving. A bird picks up and, as it were, plays with some feathers lying on the ledge, one of which it now brings to its partner, lays it on the rock, and then both pull it about. This, too, I noticed when I was last here. I have mentioned it in my Bird Watching, and account for it by supposing that we here see a last trace of the once active nest-building instinct. Perhaps, however, the act is too trivial to need any special accounting for.