1st, 1800, was the first part of this very poem.

If this supposition is correct, some light is cast both on the
"Inscription of the Pathway." and on the date assigned by Wordsworth
himself to the poem. There is a certain fitness, however, in this poem
being placed--as it now is--in sequence to the 'Elegiac Verses' in
memory of John Wordsworth, beginning, "The Sheep-boy whistled loud," and
near the fourth poem 'To the Daisy', beginning, "Sweet Flower! belike
one day to have."

The "Fir-grove" still exists. It is between Wishing Gate and White Moss
Common, and almost exactly opposite the former. Standing at the gate and
looking eastwards, the grove is to the left, not forty yards distant.
Some of the firs (Scotch ones) still survive, and several beech trees,
not "a single beech-tree," as in the poem. From this, one might infer
that the present colony had sprung up since the beginning of the
century, and that the special tree, in which was the thrush's nest, had
perished; but Dr. Cradock wrote to me that "Wordsworth pointed out the
tree to Miss Cookson a few days before Dora Wordsworth's death. The tree
is near the upper wall and tells its own tale." The Fir-grove--"John's
Grove"--can easily be entered by a gate about a hundred yards beyond
the Wishing-gate, as one goes toward Rydal. The view from it, the
"visionary scene,"

'the spectacle
Of clouded splendour, ... this dream-like sight
Of solemn loveliness,'

is now much interfered with by the new larch plantations immediately
below the firs. It must have been very different in Wordsworth's time,