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 and more into the background? The more one enjoys a thing, the more eager is one to begin it, and as here, the longer the chase lasted, the longer must the romp at the end be postponed, the tendency would be for the former to become shortened and shortened, till at length it ceased altogether, the approach of the one bird getting to be associated in the minds of the other two with the sport or game alone. In the final stage this last might be extraordinary in a high degree, but every trace of its origin, as here suggested, would have vanished. And so strongly might the habit or instinct of thus romping a trois be now implanted, that one of any pair of birds would be ready to join any other pair, and they to receive him, in order to indulge in it.

I can, indeed, see no reason why birds that sported well should succeed in life better than others, but if such sporting were an outcome of general vigour, and vigorous birds were selected, their sportings would be selected also. And that movements of this sort would tend sooner or later—if only by mere preference—to fall into some sort of form, also seems not unlikely. It will be remembered that what I have just recounted took place early in February, whereas the dabchick does not, in my experience, commonly build before May. One would not, at so early a period, expect to find the jealous and combative feelings of the male in regard to the female bird fully awake, but if there were apt to be occasional sudden outbursts of this—little flare-ups, inducing appropriate action for a few moments and then passing quickly away—the birds might be left, as it were, surprised at themselves and not quite knowing what had started