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194 thrusting up at a standing bird, who, in turn, thrusts down at it, or two recumbent ones will spar vigorously at each other. One wonders that under these circumstances the eggs are not sometimes broken, as may possibly be the case; but with regard to this, I will here quote the following note which I made on the management of the egg during incubation: —

"It appears to me that the guillemot sits with the egg not only between its legs, but resting on the two webbed feet, and pressed slightly by them against the breast. At any rate, I have just distinctly seen the bird rise up, take the egg carefully in this way between its two feet, sliding them underneath it, and then sink gently down upon it again. I believe that the egg was so placed when the bird rose, and that it rose for the purpose of improving its position. It seems likely that if the egg rests upon the bird's feet instead of on the bare rock, it must be less liable to fracture, and could be pressed slightly up by the bird amongst its feathers, so that the two opposed pressures could be combined to advantage, or either of them relaxed when it was to the bird's convenience.

"Have just seen another sitting bird rise, and, in settling down again, she certainly seemed to place her feet under the egg, assisting at the same time to place it with the bill. When she rose the partner bird came forward to her, and, lowering his head, looked at the egg with the tenderest interest, then cosseted her as she stood, and again when she had resettled.

"Another bird has half risen, showing the egg quite plainly. It is certainly resting on the feet."

Guillemots, as is well known, lay their single egg