The work they have done helps us to-day.
We have something to do, too.
We can do our part better if we know what others have done.
We can do it better if we learn to use our hands.
We can do it better if we learn to use our minds.
That is why we have this little book.
[II.]
THINGS TO THINK ABOUT
What do you need in order to live?
What do you think that the Tree-dwellers needed?