IV. _Enemies_. Kinds of insects; remedies.
Dogs; boys and men.
Proper treatment. Value of Society for
Prevention of Cruelty to Animals;
how to secure its aid.

Thus a definite purpose, that is simple, concrete, and close to the
learner's experience, can be valuable as a basis for selecting and
arranging subject-matter. Facts that bear no important relation to
this aim, such as the length of the cat's tail and the shape of its
ears, fall out; and those that are left, drop into a series in place
of a mere list.

_As a promise of some practical outcome of study in conduct_

A manufacturer must do more than supply himself with motive power and
manufacture a proper quality of goods; he must also provide for a
market. Again, if he makes money, he is under obligations not to let
it lie idle; if he hoards it, he is condemned as a miser. He is
responsible for turning whatever goods or money he collects to some
account.

The student, likewise, should not be merely a collector of knowledge.
The object of study is not merely insight. As Frederick Harrison has
said, "Man's business here is to know for the sake of living, not to
live for the sake of knowing." "Religion that does not express itself
in conduct socially useful is not true religion"; and, we may add,
education that does not do the same is not true education.

It is part of one's work as a student, therefore, to plan to turn