A few of their bones and stone weapons have been found in the gravel.
We have learned something about the Tree-dwellers from studying these.
Bones of animals that lived then have been found in the caves.
They tell something more about the life of the Tree-dwellers.
Marks of plants have been found upon the rocks.
They, too, help to tell the story.
Wise men have studied all these things.
They have tried to learn all that they could about these people.
We have written their story in this book for you, so that you may know how our forefathers lived before they learned how to use fire.
