Printed “dirgy scud” in all but the 1804 original. Possibly from Charles Dibdin (b. 1745), “Ev’ry Inch a Sailor”:

The wind blew hard, the sea ran high,
The dingy scud drove ’cross the sky ...

... like Patience on a monument ...

Twelfth Night II:iv.

The “days of other years”

Possibly from “Ossian” (James MacPherson); the phrase is used often.

Here may the “widowed wild rose love to bloom!”

May be a paraphrase of another line in The Conquest of Canaan.

“Song, beauty, youth, love, virtue, joy ....”

Identified in the text as Edward Young, Night Thoughts, 1745. The couplet on the title page is from the same source.