a
very valuable aid. More than all other forms of data combined, such
tests give the necessary information from which a pupil's possibilities
of future mental growth can be foretold, and upon which his further
education can be most profitably directed.

The publication of this revision and extension of the original
Binet-Simon scale for measuring intelligence, with the closer adaptation
of it to American conditions and needs, should mark a distinct step in
advance in our educational procedure. It means the perfection of another
and a very important measuring stick for evaluating educational
practices, and in particular for diagnosing individual possibilities and
needs. Just now the method is new, and its use somewhat limited, but it
is the confident prediction of many students of the subject that, before
long, intelligence tests will become as much a matter of necessary
routine in schoolroom procedure as a blood-count now is in physical
diagnosis. That our schoolroom methods will in turn become much more
intelligent, and that all classes of children, but especially the gifted
and the slow, will profit by such intellectual diagnosis, there can be
but little question.

That any parent or teacher, without training, can give these tests, the
author in no way contends. However, the observations of Dr. Kohs, cited
in Chapter VII, as well as the experience of the author and others who
have given courses in intelligence testing to teachers, alike indicate
that sufficient skill to enable teachers and school principals to give
such tests intelligently is not especially difficult to acquire. This
being the case it may be hoped that the requisite training to enable
them to handle these tests may be included, very soon, as a part of the
necessary pedagogical equipment of those who aspire to administrative
positions in our public and private schools.

Besides being of special importance to school officers and to students
of education in colleges and normal schools, this volume can confidently
be recommended to physicians and social workers, and to teachers and
parents interested in intelligence measurements, as at once the simplest
and the best explanation of the newly-evolved intelligence tests, which
has so far appeared in print.

ELLWOOD P. CUBBERLEY.

PREFACE

The constant and growing use of the Binet-Simon intelligence scale in
public schools, institutions for defectives, reform schools, juvenile
courts, and