in Thoreau’s Journal:
A fine spring morning. The ground is almost completely bare again. There has been a frost in the night. Now at half past eight it is melted and wets my feet like a dew. The water on the meadow this still bright morning is smooth as in April. I am surprised to hear the strain of a song-sparrow from the river side, and as I cross from the causeway to the hill, thinking of the bluebird, I that instant hear one’s note from deep in the softened air…Their short rich warble curls through the air…It seems to be one of those early springs of which we have heard, but which we have never experienced.