22-25. The rays of light from the morning star are so keen that even when it has almost vanished in the light of the clear dawn we feel that the star is there. So even after the bird has vanished from sight, we know from the “arrows” of song that it is there.
36-7. He represents the poet as absorbed in his own bright fancies, and in this way hidden from the rest of the world.
47. a dell of dew. A little dewy valley or hollow.
49. aerial hue. Literally, the colour of the air. The glowworm of Britain is said to emit a bluish light.
55. heavy-wingéd thieves. The winds made heavy by the perfume.
56. vernal. Belonging to the Spring.
57. twinkling. Sparkling with the rain upon it.
61. sprite. Spirit.
66. Chorus hymeneal. A marriage song. Hymen was the God of marriage.
77. Languor. A feeling of weakness or exhaustion.