Later on I saw another mouse while we were at work in the fields that interested me also. This one was our native white-footed mouse. We disturbed the mother with her young in her nest, and she rushed out with her little ones clinging to her teats. A curious spectacle she presented as she rushed along, as if slit and torn into rags. Her pace was so precipitate that two of the young could not keep their hold and were left in the weeds. We remained quiet and presently the mother came back looking for them. When she had found one she seized it as a cat seizes her kitten and made off with it. In a moment or two she came back and found the other one and carried it away. I was curious to see if the young would take hold of her teats again as at first and be dragged away in that manner, but they did not. It would be interesting to know if they seize hold of their mother by instinct when danger threatens, or if they simply retain the hold which they already have. I believe the flight of the family always takes place in this manner, with this species of mouse. VII The other day I was walking in the silent, naked April woods when I said to myself, "There is nothing in the woods." I sat down upon a rock. Then I lifted up my eyes and beheld a newly constructed crow's nest in a hemlock tree near by. The nest was but little above the level of the top of a ledge of rocks only a few yards away that crowned the rim of the valley. But it was placed behind the stem of the tree from the rocks, so as to be secure from observation on that side. The crow evidently knew what she was about. Presently I heard what appeared to be the voice of a young crow in the treetops not far off. This I knew to be the voice of the female, and that she was being fed by the male. She was probably laying, or about beginning to lay, eggs in the nest. Crows, as well as most of our smaller birds, always go through the rehearsal of this act of the parent feeding the young many times while the young are yet a long way in the future. The mother bird seems timid and babyish, and both in voice and manner assumes the character of a young fledgeling. The male brings the food and seems more than usually solicitous about her welfare. Is it to conserve her strength or to make an impression on the developing eggs? The same thing may be observed among the domestic pigeons, and is always a sign that a new brood is not far off.