to follow.

Equipped with a full set of tools both for hunting and fishing, the
cave-dweller looked for new living quarters.

The shores of rivers and lakes offered the best opportunity for a
regular livelihood.

The old caves were deserted and the human race moved toward the water.

Now that man could handle heavy axes, the felling of trees no longer
offered any great difficulties.

For countless ages birds had been constructing comfortable houses out of
chips of wood and grass amidst the branches of trees.

Man followed their example.

He, too, built himself a nest and called it his "home."

He did not, except in a few parts of Asia, take to the trees which were
a bit too small and unsteady for his purpose.

He cut down a number of logs. These he drove firmly into the soft bottom
of a shallow lake. On top of them he constructed a wooden platform and
upon this platform he erected his first wooden house.

It offered many advantages over the old cave.

No wild animals could break into it and robbers could not enter it. The