Note.—In the early part of the season the song ends with the first double bar; later in the season it is extended, in frequent instances, as in the notes that follow.
SONG OF THE CHEWINK.
SONG OF THE GREEN WARBLER.
SONG OF THE WOOD-THRUSH.
Note.—I have not been able to detect any order in the succession of these strains, though some order undoubtedly exists, and might be discovered by long-continued observation. The intervals in the above sketch cannot be given with exactness.