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 "Most interesting aerial nuptial evolutions of the male and female stock-dove.—They navigate the air together, following each other in the closest manner, one being, almost all the while, just above the other, their wings seeming to pulsate in time as soldiers (if sweet birds will forgive such a simile) keep step. Now they rise, now sink, making a wide, irregular circle. Both seem to wish, yet not to wish, to touch, almost, yet not quite, doing so, till, when very close, the upper one drops lightly towards the one beneath him, who sinks too; yet for a moment you hear the wings clap against each other. This sounds faintly, though very perceptibly; but the distance is great, and it must really be loud. Every now and again the wings will cease to vibrate, and the two birds sweep through the air on spread pinions, but, otherwise, in the manner that has been described. I must have watched this continuing for at least a quarter of an hour before they sunk to the ground together, still maintaining the same relative position, and with quivering wings as before. Here, however, something distracted me, the glasses lost them, and I did not see them actually alight. Another pair rise right from the ground in this manner, one directly above the other, quiver upwards to some little height, then sweep off on spread pinions, following each other, but still at slightly different elevations. They overtake one another, quiver up still higher, with hardly an inch between them, then suddenly, with an, as it were, 'enough of this,' sweep apart and float in lovely circles, now upwards now downwards. As they do this another bird rushes through the air