Thither by harpy-footed Furies hal'd,

At certain revolutions all the damn'd

Are brought, and feel by turns the bitter change

Of fierce extremes,—extremes by change more fierce;

From beds of raging fire to starve in ice

Their soft ethereal warmth, and there to pine

Immovable, infix'd, and frozen round,

Periods of time; thence hurried back to fire.

Paradise Lost. Book ii. Line 592.

O'er many a frozen, many a fiery Alp,