X. My Journey Towards the End of Earth Begins--The Adepts Brotherhood, 74 XI. My Journey Continues--Instinct, 80 XII. A Cavern Discovered--Biswell's Hill, 84 XIII. The Punch Bowls and Caverns of Kentucky--"Into the Unknown Country," 89 XIV. Farewell to God's Sunshine--"The Echo of the Cry," 99 XV. A Zone of Light, Deep Within the Earth, 105 XVI. Vitalized Darkness--The Narrows in Science, 109 XVII. The Fungus Forest--Enchantment, 119 XVIII. The Food of Man, 123 XIX. The Cry from a Distance--I Rebel Against Continuing the Journey, 128 FIRST INTERLUDE.--THE NARRATIVE INTERRUPTED. XX. My Unbidden Guest Proves His Statements, and Refutes My Philosophy, 134 MY UNBIDDEN GUEST CONTINUES HIS MANUSCRIPT. XXI. My Weight Disappearing, 142 SECOND INTERLUDE. XXII. The Story Again Interrupted--My Guest Departs, 149 XXIII. Scientific Men Questioned--Aristotle's Ether, 151 XXIV. The Soliloquy of Prof. Daniel Vaughn--"Gravitation is the Beginning and Gravitation is the End: All Earthly Bodies Kneel to Gravitation," 156 THE UNBIDDEN GUEST RETURNS TO READ HIS MANUSCRIPT, CONTINUING THE NARRATIVE. XXV. The Mother of a Volcano--"You Can Not Disprove, and You Dare Not Admit," 162 XXVI. Motion from Inherent Energy--"Lead Me Deeper Into this Expanding Study," 169 XXVII. Sleep, Dreams, Nightmare--"Strangle the Life from My Body," 175 THIRD INTERLUDE.--THE NARRATIVE AGAIN INTERRUPTED. XXVIII. A Challenge--My Unbidden Guest Accepts It, 179 XXIX. Beware of Biology--The Science of the Life of Man--The Old Man relates a Story as an Object Lesson, 186 XXX. Looking Backward--The Living Brain, 193 THE MANUSCRIPT CONTINUED. XXXI. A Lesson on Volcanoes--Primary Colors are Capable of Farther Subdivision, 204 XXXII. Matter is Retarded Motion--"A Wail of Sadness Inexpressible," 218 XXXIII. "A Study of True Science is a Study of God"--Communing with Angels, 224 XXXIV. I Cease to Breathe, and Yet Live, 226