IX. THE ASSOCIATION OF IDEAS

A case of habit,--The two laws, contiguity and similarity,--The teacher
has to build up useful systems of association,--Habitual associations
determine character,--Indeterminateness of our trains of
association,--We can trace them backward, but not foretell
them,--Interest deflects,--Prepotent parts of the field,--In teaching,
multiply cues.

X. INTEREST

The child's native interests,--How uninteresting things acquire an
interest,--Rules for the teacher,--'Preparation' of the mind for the
lesson: the pupil must have something to attend with,--All later
interests are borrowed from original ones.

XI. ATTENTION

Interest and attention are two aspects of one fact,--Voluntary attention
comes in beats,--Genius and attention,--The subject must change to win
attention,--Mechanical aids,--The physiological process,--The new in
the old is what excites interest,--Interest and effort are
compatible,--Mind-wandering,--Not fatal to mental efficiency.

XII. MEMORY

Due to association,--No recall without a cue,--Memory is due to
brain-plasticity,--Native retentiveness,--Number of associations may
practically be its equivalent,--Retentiveness is a fixed property of the
individual,--Memory _versus_ memories,--Scientific system as help to