Part,  Chapter

1      I,  II  |        its own account the vast tracts of country between the Mississippi
2      I,  VII |       there are vast unexplored tracts which will long defy the
3      I,  XVII|       opposite atmosphere. Vast tracts of the ocean became gradually
4     II,  VIII|     pointing to the long smooth tracts on which the curling waves
5     II,  X   |      that the waves now covered tracts of sand which were formerly
6     II,  X   | long-sustained flight over vast tracts of the ocean began to desert