One should always keep in mind that psychology is essentially a

laboratory science, and not a text-book subject
One should always keep in mind that psychology is essentially a
laboratory science, and not a text-book subject. The laboratory material
is to be found in ourselves and in those about us. While the text should
be thoroughly mastered, its statements should always be verified by
reference to one"s own experience, and observation of others. Especially
should prospective teachers constantly correlate the lessons of the book
with the observation of children at work in the school. The problems
suggested for observation and introspection will, if mastered, do much
to render practical and helpful the truths of psychology.