See!through yon fissure deep and dim there The demon's forehead glows amain, For as with me so 'tis with him there In the skull's cavern seethes the brain.

The ice was excessively fissured; we crossed crevasses and crept round slippery ridges, cutting steps in the ice wherever climbing was necessary.

What horn is left becomes rough and irregularly fissured, and has been likened by some observers to deeply-wrinkled bark of an old tree.