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Rh we will suppose, been chosen for his good looks, becomes in his turn—for how, under such circumstances, can he help it?—the chooser between those of others; and thus there will be a double process of selection carried on between the two sexes.

But may we not go a step farther in our suppositions?—for which, as I believe, there is a considerable body of evidence, in spite of the frequent great difficulty and consequent absence of proper observation. The theory of sexual selection is based upon the assumption that choice is exercised by the female, and this exercise of choice must go hand-in-hand with a corresponding development of the critical faculty in regard to the comparative merits of different males, which again would involve a power of taking a liking, or a dislike, to any one of them. How are we to reconcile all this with that quiescent, waiting-to-be-spoken-to frame of mind which we assume to be that of the hen bird in regard to the cock, during the season of courtship? A decided preference should show itself in actions. Why should she never exercise her critical faculty except as between such males as are rivals for her favour? If, for instance, she is courted by two or more males, why should she not declare in favour of a third or fourth that is either indifferent or courting another hen, on the ground of his superior beauty alone?

Why, in fact, should it not be with birds as it is with men and women? Women, to casual observation, seem at least as coy and modest as do hen birds,