Part,  Chapter

1      I,  XIII |  iron bolts through them at intervals; and when even this contrivance
2      I,  XVII |  visited at pretty frequent intervals.~On the 12th November a
3      I,  XIX  |     and filled with strange intervals, which produced an indescribable
4      I,  XXII |  and snow fell at irregular intervals.~The thermometer outside
5     II,  IV   | explorers, who conversed at intervals after long silent pauses,
6     II,  VI   | torrents of rain falling at intervals. Meanwhile, however, the
7     II,  XVIII|     devoured in their short intervals of repose.~The boring proceeded