On Seeing a Storm-Petrel in a Cage on a Cottage Wall and Releasing It

GAZE not at me, my poor unhappy bird;
  That sorrow is more than human in thine eye;
Too deep already is my spirit stirred
  To see thee here, child of the sea and sky,
Cooped in a cage with food thou canst not eat,
Thy “snow-flake” soiled, and soiled those conquering feet...