chiasmus

XX

The lonely mountains o’er,
And the resounding shore,
A voice of weeping heard and loud lament;
Edgèd with poplar pale,
From haunted spring, and dale
The parting Genius is with sighing sent;
With flower-inwoven tresses torn
The Nymphs in twilight shade of tangled thickets mourn.

John Milton, "On the Morning of Christ's Nativity"