CHAPTER 19 Geological Studies in Situ CHAPTER 20 The First Signs of Distress CHAPTER 21 Compassion Fuses the Professor’s Heart CHAPTER 22 Total Failure of Water CHAPTER 23 Water Discovered CHAPTER 24 Well Said, Old Mole! Canst Thou Work i’ the Ground So Fast? CHAPTER 25 De Profundis CHAPTER 26 The Worst Peril of All
