Below is a list of the chapters from whence the significant sentences came and the number of sentences that were extracted from each chapter:

  Chapter           Number of sentences
  chapter-002.txt            5
  chapter-107.txt            3
  chapter-089.txt            3
  chapter-046.txt            2
  chapter-047.txt            2
  chapter-136.txt            2
  chapter-043.txt            2
  chapter-034.txt            2
  chapter-048.txt            1
  chapter-049.txt            1
  chapter-033.txt            1
  chapter-072.txt            1
  chapter-076.txt            1
  chapter-079.txt            1
  chapter-083.txt            1
  chapter-087.txt            1
  chapter-038.txt            1
  chapter-100.txt            1
  chapter-070.txt            1

Compare these chapters to the line chart to see how each of these chapters is heavily weighted towards the topic model topic called "whales".