Part,  Chapter

1      I,  XIII|   filling up each hollow with layers of hot tar, obtained without
2      I,  XIX | having noticed that the upper layers of snow were becoming softer,
3      I,  XX  |     ill-ventilated rooms, and layers of ice, increasing in thickness
4      I,  XXII|      still covered with thick layers of frozen snow, and the
5     II,  III | arrangement of the stratified layers of ice and earth of which
6     II,  III |     as they advanced, and the layers of earth and sand became
7     II,  V   |    her the arrangement of the layers of earth and ice at the
8     II,  XIII|       and here and there many layers of ice were piled one upon