I cannot tell: but meet it is the name
Of such a valley perish from the earth!
Since from its head (where so abounds the same
Great alpine chain which cast Pelorus forth,
With springs that few spots are impregnate more)
To where it seeks, arriving at the main,
What the sky sucks from ocean to restore
(Whence rivers have what waters they contain),
Virtue by all is hunted for a foe
As 'twere a snake;—whether from fault of place