Breezes from the north. Indications of proximity of the sea. Warm winds. What wind temperatures tell. The missing yak herd. Mystery of the turning water wheel. The mill and workshop. Their home. "Baby" learning civilized ways. The noise in the night. The return of the yaks. The need for keeping correct time. Shoe leather necessary. Threshing out barley. The flail. The grindstone. Making flour. Baking bread. How the bread was raised. What yeast does in bread. Temperature required. The "Baby" and the honey pot. The bread with large holes in it. George's trip to the cliffs. A peculiar sounding noise and spray from the cliffs. An air pocket. Compressed air. Non-compressible water.
Earthquake indications. The seismograph. The theory about the interior of the earth. How geologists know the composition of the interior of the earth for miles down. The earth's "crust." The weekly hunting trip. Determine to cross South River and explore. The lost hatchet found. Making a raft to cross the river. Going into the interior. The sound of moving animals. Caution in approaching. Discovering the beast. Two shots. The disappearing animal. Indications that the animal was hit. Trail lost. Returning to the river. The animal again sighted. Firing at the animal. The shots take effect. The animal too heavy to carry. Return to the Cataract home. Finding the camphor tree. Its wonders as a medicine. Calisaya. Algoraba, a species of bean, or locust. Sarsaparilla. The trip to South River with the team. Finding the shot animal. The ocelot. Two bullet holes instead of one. The animal not at the place where it was shot the night before. Mystery explained by the finding of second animal which they had shot. Skinning the animals.
[CHAPTER VI. Hunting Vegetables and Plants]
The accomplishments of George and Harry. Theory and practice. Fermentation. How heat develops germs. Bacteria. Harmless germs. Tribes of germs. Septic system of sewage. The war between germs. Setting germs to work. Indications from the vegetable world as to the climate. Prospecting in the hills. Tanning leather. Bark, and what it does in tanning. Different materials used. The gall nut and how it is formed. Different kinds of leaves. The edges of leaves. The most important part of every vegetation. Trip to the cliffs. Hunting for the air pocket. Discovery of a cave. Exploring the cave. The water in the cave. Indication of marine animal in the water. Return to the mouth of the cave. Discovering the air pocket. The peculiar light in the cave. Calcium coating.
[CHAPTER VII. Investigating the Prospector's Hole]
Speculation as to the animal in the cave. Determined to explore the mystery of the "hole" in the hill. Trip to the hills. Difficulty in finding the "hole." Accidental discovery of a rock. The "hole" found. Indication that it was made by man. Why plants flourish around holes and stones. Moisture and heat. Object of cultivating plants. Lead and silver ore. Zinc. Working with their ore furnace. Putting metals to work. Labor-saving tools, what they are and what they do. Roasting ore. Melting roasted ore in crucible. Recovering zinc. Light from zinc and copper. Harry bitten by a "cat." The zibet.
[CHAPTER VIII. The Bull Fight]
Different fruit, flowers and vegetables. The thistle. Its nutritious qualities. Why animals can eat it. The sorrel and the shamrock. Significance of the latter. Vanilla. Smell is vibration. Harmony and discord in odors. What essences are composed of. Preserving seeds for planting. Food elements in vegetables. Surprising increase in their herd of yaks. Investigation. The wild bull. Apollo, the bull of their herd. His absence. The wild bull charging George. Stampede of the herd. George carried with them. Appearance of Apollo. Engaging in combat. Apollo the stronger. Reappearance of George. Return of the cows. Apollo the victor. Finding a brand mark on the wild bull. Inventory of their stock. Work in tanning vats. The flash of Harry's gun in the distance. Explanation of the difference in time between the flash and report. "Sound" or "noise." Vibrations. Light. The locomotive whistle explained.