The first view of the savages. Excitement in their camp. The story of the boys. What they had accomplished. Their home at the Cataract. The fifth expedition. In the savages' country. Some of the mysterious events. "Angel" one of the party. The dense forest. The fight between the two tribes. Going closer to the battle ground. The wagon as a means of defense. Taking position on the shore of a stream. The defeated party retreating toward the wagon. Close view of the natives. The defeated tribe taking up position behind the wagon. The victorious party attacking the wagon. Repelling the charge. The fight witnessed by the defeated tribe.

Their two foes. Preparing for the night. Poisoned arrows. Clearing away the brush. Angel restless during the night. John's adventure as a scout. The shot in the darkness. The result. John's second scouting expedition. Return of the warriors. The arrow and the cap. The reappearance. The volley. The slain warriors. The trophies. The different headdresses. How tribes are distinguished. Determine to go forward. Trinkets of civilized people found on the battlefield. Camp the second night. Angel discerns the approach of a band. The Professor tries to establish communications. Failure. A position of defense. The attack and repulse. The second volley. Charging the savages. Capture of a wounded chief and a warrior. Treating the wounds. The chief advising his men not to attack.

Difficulty in communicating with the chief. Examining the chief's pockets. Finding a photograph of George and Harry. Hunting the pockets of the slain warriors. The match box. John's startled look. The monogram. Human hair. Its part in ornamentation. Scalps. Customs connected with human hair. Going forward. Surrounded by the warriors. The running fight. The yaks beyond control. The flight. The savages trying to outflank them. Warriors on all sides. The river in sight. A tributary to the West River. Getting the yaks under control. The wounded animals. Heading for a peninsula. The mute captive. The siege. Instilling fear. Learning the chief did not belong to the attacking party. Consternation on discovering that the attacking party did not belong to either of the parties who first attacked them.

War among the natives. John's ability with the gun. Cooped up in the peninsula. Recollection in animals. A dual self. Memory. No attack during the night. The savage attempt to starve them out. Planning to escape. Determine to build a raft. John and Harry's night adventure after material. Crossing the tributary to the north. Bringing in logs. The structure to imitate the wagon. Driving the team into the river. Floating the logs under the wagon. Crossing the stream. A safe passage. A good retreat. How the ruse affected the natives. The amused captive chief. Starting northward. The disapproval of the chief. Viewing a fight between tribes. Short of ammunition. An unexpected native village. The startled warriors. Attacked by the natives.

The fight. Defeat of the savages. Charging them through the village. The large hut. A cry from within. American boys captive. Their own companions. Weak and hungry. Taken to the wagon. Their terrible condition. The return of the savages. Feeding the famished boys. The second attack. The flanking parties. The first volley. Retreating toward the river. Followed by the warriors. Outwitting the enemy. Flight of the wagon to the hill. A peculiar rock formation. Discovery of a cave. Peculiar actions of John and the Professor. Their advice to go on. A hurried trip to the river. Arranging the weapon for defense. Fearing a night attack.

Ralph and Tom. Cast ashore in the north of the island. Meeting a band of savages with a captive. Poison berries. Sickness. Hunting food. Captured by a tribe of natives. Peculiarities of the native headdresses. Taken to the mountains. Escaped. Recaptured by another tribe. Sacrificing prisoners. The round silver match box. Savage charms. Kindly treated by the second tribe. The second escape. Hunting food. Starving. Trying to go back to the tribe. The mistake in going to the wrong tribe. How boldness saved them. The watch in possession of the chief. The initials J. L. V. Treated like brothers. Captured by another tribe in a fight. Their last captors.

John's search in the night. Return. Indicating by signs that no savages were in sight. Continuing their flight in the night. The course along the bed of the stream. John in the advance pushes through the underbrush. By motions indicates the possibilities of crossing the river. Finding driftwood. The raft. The launching of the wagon. Camping on the opposite side. Watching the savages. Deep streams. Shallow water courses. Savage strategy. Hunting for food. Coffee and corned beef. Woodchuck and pheasants. Discussing the wounded chief. Conclude to take him to Cataract. Taking up the march for home. Finding the direction of the south pole. The Dog Star Sirius.

The tramp through the forest. Wonderful effect on the rescued boys. New fruit and vegetables. The rubber tree. Carricature plant. Sighting Observation Hill. The Old Flag. The change in John. Angel happy. The visit of the boys to the shop. The rambles about the place. A wonderful stimulus. Angel turning the grindstone. Appreciation. The Professor's encomium. Rearranging their quarters. Putting up new buildings. The barley thief. Making bread. The chief at Cataract. Crutches. The novelty to him. Learning to walk. His amazement at the workshop. Trying to talk. Threshing barley. The grist mill. The home-made violin. Dancing. A religious ceremony. Different national customs in dancing.

Dividing the work. Hunting vegetables. Securing game. Cultivating the garden. Making clothing. Footwear. John making lasts. Ramie fiber. Preparing more weapons. Angel's new suit. New ores and minerals. Cinnabar. Quicksilver. Poisons from mercury. The boys' trip to Observation Hill. Angel's gun. The talk of the boys. Desire to survey the island. Telling the rescued boys their story. Savage traits concerning property. Locks. Doing work on holidays. Recreation. The instruments for surveying. The boathouse. Chief and the spear. His dexterity. How the chief held the spear. The chief and the bolo.

Observing the heavens. Degrees and what they mean. Angles. Calculating position by the stars. The moon as a factor by night. The fixed stars in the moon's path. Determine to recover the wrecked boat. The boys inaugurate the trip. A jolly lark. Through the forest. The alarm in the night. The attack of an animal. Missed. Sighting the West River. Miscalculation. Discovering their former tracks. In the savages' country. The chatter of Angel in the trees. The alarm. Savages. Eluding them. Escaping to the north. Discovered by the natives. The pursuit.

Preparing for defense. Appearance of the savages. The charge. Repelling the attack. Driving the team ahead. Harry and Tom as rear guards. Harry's injunction to force the team on rapidly. The warriors. Turning to the east. Eluding the enemy. The rush for the river. Crossing. The savages at the river. Reinforcement of the pursuing party. The ruse leaving the river. Hiding the wagon. Returning to the river. The two warriors swimming the river. Their surprise. Their effort to escape. Recognizing the savages as the captors of the boys. Consternation in the camp of the enemy. Determining to recross the river. The flight to the north. Recrossing. Return home.

Their happy reception at the Cataract. Why their observations of the moon led them astray. Distinguishing fixed stars. How Angel fought the savages. Individuality. The chief an enigma. How he used the grindstone. His interest in machinery. The yardstick of the heavens to measure degrees. The Constellation Orion. The new calf. Milk and butter. The mysterious visit of the chief to the clay banks. Eating clay. Observations by Ralph and Tom. The clay eaters of the world. The cave and the treasure. The Professor refuses to take a share of it. Determination of the boys. Harry and George go to the cave. Go back for Ralph and Tom.

An island of abundance. Nuts and vegetables. Oils for illumination. Unripe fruit. How nature protects her products. Eggs. How good and bad are determined. Gases formed within the shell. Building an addition to their home. Putting up the new building. The accident to John. A terrible wound in the head. Chief's solicitude for John. Watching the results of the injury. The human traits in the chief. Danger point of the fever. The wonderful difference in his eye. Recovers memory. A deep sleep. His first words. Aphasia. The brain center. His initials J. L. V. on the match safe. Recognizing the chief.

Native of New England. Ran away to sea. Fortunately fell into hands of a humane captain. Became chief clerk. Learned navigation. The captain's interest in him. The return. The meeting with the captain's daughter. The wedding. Sailing east with his wife in the captain's vessel. A plague-infected port. Death of his wife. Leaving the accursed port. Death of the captain. Disposing of the ship. Travels through India. Enlists at Gibraltar. Serves in Matabela campaign. Goes to England. Is tutor to a Lord. Goes to Greece. Serves in two campaigns. Returns to New York. Enlists for campaign against Indians. Five years' service. Goes to Egypt to conduct explorations. Returns fever-ridden. Accepts Professorship. Signs as Professor in the schoolship Investigator. Sickness prevents his sailing. Wanders to San Francisco. Engages with friends to search South Sea Islands for treasures. Shipwrecked. Finding a cave. Captured by savages. Escapes. Meets with an accident. Loses all memory.

How John's story impressed them. How the boys entertained John with the stories of their adventures. The story of the yaks. John tells them how they could have controlled them with the different knots and hitches. The spectroscope. Light as a medium. The composition of the heavenly bodies. The solar spectrum. The boys remember John's story of the cave. His story confirming their knowledge about the savages. The concert with the flute and violin. Making glass for windows. Silver and mercury. Looking-glasses. Amalgam. Making small glass mirrors for the inhabitants. The chief's surprise at the mirrors. His contribution to the larder. The Amarylla. The poison plant. The boys' suspicions of the chief. Good for food. Stomach or blood poisons.

Completion of the house. Furnishing it. The chief recovers health. Showing John the message from the lifeboat. "Waters" one of his crew. The mystery of the photograph. Information that others of the ill-fated Investigator were on the island. Reasons why certain tribes sacrificed white captives. A new expedition planned. Determine to go overland. Making new guns. Ammunition. The boys invite Ralph and Tom to visit the cave. The surprise of the boys at the skeletons and the treasure. Exploring the cave. A terrific roar. Alarmed. Determine to investigate. Finding the Professor and John. The surprise party.

The boys ask John about his wonderful cave. The charted treasure caves. Seeing the treasure in the cave on the hill where the boys were rescued. An occupied cave. The medicine men. The two entrances and the cross-shaped interior. How the hoards were acquired. Piracy on the high seas. The gold and silver of the world. The precious metals taken to Europe by the Spaniards. Rushing work on the preparations. The gun barrels. Chief showing the boys how to make and use the bows. The disappearance of chief. The invention of a portable fort. How it was made. Stocking the wagon. Experimenting with the fort. Necessity as the mother of invention. The improvements in the fort. A new suggestion. Using the fort as a raft.

Weight and gravity. Acting in all directions. Proving the law of universal gravitation. Drilling with the raft equipment. Grinding barley flour. Making sleeping mattresses. The bustle of final preparations. The good-by to their herd of yaks. The march to the falls. John discovers a log in the drift and a rope. The dense forest. Crossing the river to the south. Finding a camp fire with fresh bones. Numerous traces of inhabitants. A glowing fire. Following the trail. Trying to catch them before night. Efforts to capture one as a means of opening communication. Sighting the camp. Hurried consultation. Surrounding the camp of the natives.