Cold, and froze in the night. The sallow will not open till some time to-day.

  I hear a bay-wing on the railroad fence sing. . .

  P.M.—To Walden and Fair Haven Ponds

  Still cold and windy.

  The early gooseberry leaf-buds in garden have burst,—now like small green frilled horns. Also the amelanchier flower-buds are bursting.

  As I go down the railroad causeway, I see a flock of eight or ten bay-wing sparrows flitting along the fence and alighting on an apple tree. . .