Chapter 1: My Uncle Makes A Great Discovery

Chapter 2: The Mysterious Parchment

Chapter 3: An Astounding Discovery

Chapter 4: We Start On The Journey

Chapter 5: First Lessons In Climbing

Chapter 6: Our Voyage To Iceland

Chapter 7: Conversation And Discovery

Chapter 8: The Eider-down Hunter--Off At Last

Chapter 9: Our Start--We Meet With Adventures By The Way

Chapter 10: Traveling In Iceland

Chapter 11: We Reach Mount Sneffels--The "reykir"

Chapter 12: The Ascent Of Mount Sneffels

Chapter 13: The Shadow Of Scartaris

Chapter 14: The Real Journey Commences

Chapter 15: We Continue Our Descent

Chapter 16: The Eastern Tunnel

Chapter 17: Deeper And Deeper--The Coal Mine

Chapter 18: The Wrong Road!

Chapter 19: The Western Gallery--A New Route

Chapter 20: Water, Where Is It? A Bitter Disappointment

Chapter 21: Under The Ocean

Chapter 22: Sunday Below Ground

Chapter 23: Alone

Chapter 24: Lost!

Chapter 25: The Whispering Gallery

Chapter 26: A Rapid Recovery

Chapter 27: The Central Sea

Chapter 28: Launching The Raft

Chapter 29: On The Waters--A Raft Voyage

Chapter 30: Terrific Saurian Combat

Chapter 31: The Sea Monster

Chapter 32: The Battle Of The Elements

Chapter 33: Our Route Reversed

Chapter 34: A Voyage Of Discovery

Chapter 35: Discovery Upon Discovery

Chapter 36: What Is It?

Chapter 37: The Mysterious Dagger

Chapter 38: No Outlet--Blasting The Rock

Chapter 39: The Explosion And Its Results

Chapter 40: The Ape Gigans

Chapter 41: Hunger

Chapter 42: The Volcanic Shaft

Chapter 43: Daylight At Last

Chapter 44: The Journey Ended