Feb. 18 [...] I am excited by this wonderful air and go listening for the note of the bluebird or other comer. The very grain of the air seems to have undergone a change and is ready to split into the form of the bluebird's warble. Methinks if it were visible, or I could cast up some fine dust which would betray it, it would take a corresponding shape. The bluebird does not come till the air consents and his wedge will enter easily. The air over these fields is a foundry full of moulds for casting bluebirds' warbles. Any sound uttered now would take that form, not of the harsh, vibrating, rending scream of the jay, but a softer, flowing, curling warble, like a purling stream or the lobes of flowing sand and clay. Here is the soft air and the moist expectant apple trees, but not yet the bluebird. They do not quite attain to song. What a poem is this of spring, so often repeated! [...]
Feb. 24. A fine spring morning. The ground is almost completely bare again. There has been a frost in the night. Now, at 8:30, 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 riverside, 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. It is already 40°, and by noon is between 50° and 60°. As the day advances I hear more bluebirds and see their azure flakes settling on the fence-posts. Their short, rich, crispy warble curls through the air. Its grain now lies parallel to the curve of the bluebird's warble, like boards of the same lot. It seems to be one of those early springs of which we have heard but have never experienced. Perhaps they are fabulous.