ded here as a help
to the teacher who may be questioned concerning these points. Should the
teacher desire further information on this subject, she will find it in
the references given below.

In places where it is impossible for the children to go to an
uncultivated place, the teacher may substitute for the suggestions at
the close of the lesson other work. But she should in some way give the
child an idea of grassy plains, wooded hills, and dense forests. Unless
he has such an experience as this he will not be able to deal with the
problem of finding a place where the Tree-dwellers might have lived. The
teacher's problem at the close of this lesson is the one that
constitutes the central thought of the next two lessons. It is this: How
can the child get such an experience as will enable him to select a
place where the Tree-dwellers might have lived? In these days of cheap
transportation there are few schools where it is not possible for some
of the children to visit places that are sufficiently wild to answer the
purpose. By making use of such experiences of the children in
uncultivated places as they have or they can easily get, and by
supplementing these by means of pictures, stories, and sand modeling,
very satisfactory results can be obtained.

References: Katharine E. Dopp, _The Place of Industries in Elementary
Education_, pp. 18, 19, 126, 127; "Some Steps in the Evolution of Social
Occupations," _The Elementary School Teacher_, January, 1903.

_Lesson III._ The problem of this lesson has already been stated. The
questions at the beginning of the lesson serve to help the child to
interpret what he has observed, or what has been illustrated to him. The
scene of this lesson need not be definitely located in space, for this
book is a generalized account of progress, not a description of a
particular locality. Should the teacher need assistance in getting a
more adequate notion of a river valley, she will do well to read the
following references, as well as the chapters on river valleys in any
good textbook on geography or physiography.

References: N. S. Shaler, _First Book in Geology_, pp. 1-4; Frye,
_Brooks and Brook Basins. Aspects of the Earth_, chapter on "River
Valleys."

Winchell, _Walks and Talks in a Geological Field_.

Rollin D. Salisbury and Wallace W. Atwood, _The Geography of the Devil's
Lake Region, Wisconsin_, pp. 36-58.

[NOTE. This pamphlet may be obtained by writing to Professor
E