Erasmus Darwin (grandfather of Charles), 1731-1802, “The Temple of Nature, or, The Origin of Society”.

But far beyond the pride of pomp, and power,

He lov’d the realms of nature to explore;

...

Timothy Dwight (president of Yale), 1752-1817, The Conquest of Canaan. The Cambridge History of English and American Literature says that the poem was “written by the time he was twenty-two, but published when he was thirty-three and should have known better.”

musing, moping melancholy.

Arthur Murphy, The Upholsterer or What News (1758), I:i “musing, moping, melancholy lover”

The breeze’s rustling wing was in the tree

This unidentified line is also quoted in Mitchell’s Albert and Eliza.

the “stilly sound” of the low murmuring brook