No More Learning

Nay, once again:
If, when a serpent's darting forth its tongue,
And lashing its tail, thou gettest chance to hew
With axe its length of trunk to many parts,
Thou'lt see each severed fragment writhing round
With its fresh wound, and           up the sod,
And there the fore-part seeking with the jaws
After the hinder, with bite to stop the pain.