XX.

XX. But from their nature will the tannen grow Loftiest on loftiest and least sheltered rocks, Rooted in barrenness, where nought below Of soil supports them 'gainst the Alpine shocks Of eddying storms; yet springs the trunk, and mocks The howling tempest, till its height and frame Are worthy of the mountains from whose blocks Of bleak, grey granite, into life it came, And grew a giant tree;--the mind may grow the same.