ures along the river.
Decide to follow the river to the north. Camping at the shore of a
small stream. Prospecting tour on the stream. The flint arrow. The
arrow in the skull of an animal. Different kinds of arrows.
Home-sick. The light across the river. The test of firing a gun.
Disappearance of the light. Seeking explanation. The night watch.
The early breakfast and start. Scouting in advance. Qualifications
in scouting.

III. THE BEAR FIGHT

A coast line of steep hills. Shooting an animal. The answering
shot. The wonderful echo. Calculating distance of the bluff by the
sound. The bear. The attack of the bear. The Professor's shot. The
frightened yaks. Recovery of the wagon. Death of the bear. Rugged
traveling. Changing their course. Deciding to return to their home.
Stormy weather. The traveling chart. Methods used to determine
course in traveling. An adjustable square. Obtaining angles from
the shadows.

IV. THE DISAPPEARANCE OF THE YAKS

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.

V. AN EXCITING HUNT

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 t