Analysis of Willow-Pipes

So in the shadow by the nimble flood
He made her whistles of the willow wood,
Flutes of one note with mellow slender tone;
(A robin piping in the dusk alone).
Lively the pleasure was the wand to bruise,
And notch the light rod for its lyric use,
Until the stem gave up its tender sheath,
And showed the white and glistening wood beneath.
And when the ground was covered with light chips,
Grey leaves and green, and twigs and tender slips,
They placed the well-made whistles in a row
And left them for the careless wind to blow.