See Spenser's Faërie Queene, book i. canto i. stanza 8.
... the liveliest bird
That in wild Arden's brakes was ever heard.
Compare As you like it, act II. scene 5.
And soon approach Diana's Looking-glass!
To Loughrigg-tarn, etc.
See the note appended by Wordsworth to the sequel to this poem.
A glimpse I caught of that Abode, by Thee
Designed to rise in humble privacy.
He imagines the house which Sir George Beaumont intended to build at Loughrigg Tarn, but which he never erected, to be really built by his friend, very much as in the sonnet named Anticipation, October, 1803, he supposes England to have been invaded, and the battle fought in which "the Invaders were laid low."
... behold a Peasant stand
On high, a kerchief waving in her hand!
See the Fenwick note preceding the poem.
... a barren ridge we scale;
Descend and reach, in Yewdale's depths, a plain.