The food supply. Butter. Cream. Centrifugal motion. Difference in specific gravity between cream and milk. Making a cream separator. Vegetables. Onions. Chives. The stranger as a prospector. Procuring samples. Peculiarities of his malady. An exciting encounter with a bear. John's skill as a hunter. Another honey tree. Killed with a spear. The bear pelt. Visiting the falls. Action to indicate that John recognizes the falls.
[CHAPTER XV. The Story of the Cave]
Mystery about John. Humanity's search. The desire to know and acquire. Gathering supplies for an extended trip by land. The boys visit the cave. Determine to search the chamber visited by the Professor. Gorgeous calcareous hangings. The ghosts of past centuries. Gold and silver vessels. Skeletons. A recess. A row of chests. Spanish guns. The chained skeletons in the recess. An arsenal. The struggle. Locked in the embrace of death. Ancient origin of the cave. Paleontology. Stone and bronze ages. Atlantis, the great continent in the Atlantic, which disappeared. Story of the Egyptian priests. The actinic rays. Purifying action of sunlight. Bacteria. Glass houses. The eye. How it expresses character. Laughter. How it brightens the eye. Fishhooks. A fishing party. The salmon.
[CHAPTER XVI. Music and Animals]
Preserving fish. Why heat is used. The use of tin for cans. Music. The violin made by the boys. Violin strings; what they are made of. How they are prepared and treated. The concert. How the music affected Red Angel. John enraptured. How it touched him. The change in his eyes. The field mouse. How different animals are moved by music. The lion. Hippopotamus. Tigers. Monkeys. Momentary flashes of intelligence in John. Building a new wagon. Finding and making paint. Lead. Fermentation. Flax. Driers. Turpentine. Synthetic food. Analysis. Tubes for powder. Completing the guns. Stocking the wagon with provisions. Starting on the trip. Jack and Jill. The sixth trip.
[CHAPTER XVII. The Trip Through the Dense Forest]
The trip along Cataract River. The great forest. How Angel traveled. Reaching South River. Discovering a second falls. Where the debris on a seashore comes from. The jungle. Leaving the river. The two animals in the night. The camp aroused. A fight in the dark. The puma. The frightened team. The injured yak. Animal language. The panther. Trying to avoid the forest. Growing denser. John and Harry scouting through the forest. Blazing a trail. The hidden luncheon. End of the forest. Returning to the wagon. The noise in their path. The wagon following the trail. The injured yak improving.
[CHAPTER XVIII. Seeing the First Savages]
Teaching Angel. Finding a campfire. Determine from the conditions that it was recently made. Prospecting from the tops of trees. A climbing ring. How made and used. The climbing operation. Harry sees another forest to the south. Clear in the west. The wounded yak calls a halt. Resuming the journey. Harry in the grasp of a giant anaconda. John severs its body with a bolo. Boa constrictor. The python. The Cashew tree. Gum arabic. Seeing the West River. Discovering signs of habitations to the south. Course to be followed in meeting the natives. Hearing voices in the night. Crackling of twigs. A party of savages. The next morning. Examining the tracks made by the midnight party. Following the trail thus made. The open country. The first view of the inhabitants.