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Rh and hereditary instinct that the shore is its place of safety, whatever the emergency may be, it there takes refuge." The shag, as far as I know, has nothing particular to fear, either by sea or shore. His only enemy is man, who is not confined to either, but is as brutal and ignorant on the one as the other. But in avoiding danger the instinct of any animal would probably be to leave the place to which it was less accustomed, and run to that with which it was familiar—and this we constantly see. Thus a land-bird that was beginning to take to the water would leave it for the land on any alarm, whilst a water-bird under similar circumstances would make for the water. But all water-birds were probably land-birds once, so that we might expect sometimes to see in their young that old instinct of taking refuge there, which had become reversed in the parents. We might also expect to find greater dislike, on their part, to entering the water; and certainly the young shags did enter it very unwillingly from the first. So, indeed, for that matter did the old ones, as already stated, but with them there was the love of being on their nests, or at least their nesting-ledges—a late continuance of the breeding habits—to be overcome. When once they had plunged, however, they did not, like the young birds, swim at once to the shore again, but made for the open sea, and it must have required a strong contrary instinct on the part of the latter not to follow them. The lizards on the Galapagos Islands have, no doubt, also taken to the sea