rmine the form this lesson shall take. At any
rate, there will be an opportunity to observe birds, squirrels, or
rabbits.

_Lessons XIII and XIV._ The shelter described is a very early form and
is important as a step in the evolution of shelter. The remains found
give ample evidence that such a form was adopted by the Cave-men of
France.

_Lesson XV._ It was a common practice among primitive peoples to adopt
a child or even a grown person into the clan. The custom is important
as revealing one method of introducing new ideas at a time when means
of communication were undeveloped.

The description of the method of softening skins by beating and
treading upon them illustrates the common use of rhythm and song as
a means of holding the attention to what otherwise would be tedious
work.

_Lessons XVI and XVII._ The data for these lessons is taken from
drawings made by the Cave-men and from the results of anthropological
research among primitive peoples. It will be best not to confine the
children to any one mode of clothing, but to allow them to express
their own ideas regarding the first forms used.

_Lesson XVIII._ In connection with this lesson the children will be
interested in observing the signs of a storm, the actions of animals
before and during a storm, methods they adopt to protect themselves,
as well as the animals and birds which migrate from the place where
the children live.

_Lesson XIX._ Let the children think of ways in which snowshoes might
be invented, and the things the Cave-men would be able to do after
having the snowshoes.

_Lesson XX._ The invention of traps requires more forethought than the
invention of weapons and was at a later date. The accidental catching
of animals in natural traps, such as vines, pot-holes, soft places in
the marshes and cliffs, offered a suggestion; and the tediousness of
lying in wait, on the one hand, and the danger of a direct conflict
with large animals, on the other, offered a strong motive for the use
of nature's suggestions in the way of traps. Undoubtedly women made a
large use of traps in catching the smaller animals before men gave
much attention to this mode of hunting.

If the children make as many simple traps as they can think of and
arrange them in the order of their complexity, they will be able after
a few months to work out a fairly complete series in the evolution of
traps.

_Lesson XXI._ This lesson illustrates the constant interaction betwee