Part,  Chapter

 1      I,  X   |      unimpeded by any natural barrier or aggregation of rocks.
 2      I,  XVII|     cold into an impenetrable barrier.~The “ young ice “ was rapidly
 3      I,  XXII|     held back by some natural barrier, would inundate the country.~
 4     II,  X   |     sea was an insurmountable barrier, and they, too, would have
 5     II,  XIV |      hemmed in by this mighty barrier, and it seemed probable
 6     II,  XV  |     over three miles.~The icy barrier presented a truly imposing
 7     II,  XV  | internal structure of the icy barrier. The blocks of which it
 8     II,  XV  |    run completely through the barrier.~The aspect of the ice-field
 9     II,  XV  |      had ascertained that the barrier of ice was of moderate thickness,
10     II,  XV  |   chain of icebergs. The huge barrier had parted nearly in the
11     II,  XIX |    hurrying on before the icy barrier, which was in the grasp