primarily as models for teaching the methods of exposition employed in
the explanation of mechanisms, processes, and ideas, they are
nevertheless sufficiently representative of certain tendencies in
science to be of intrinsic value. Indeed, each author is a recognized
authority.

Another feature is worthy of mention. Although the material covers so
wide a field--anatomy, zoölogy, physics, psychology, and applied
science--that the collection will appeal to instructors in every type of
college and technical school, the selections are related in such a way
as to produce an impression of unity. This relation is apparent between
the first selection, which deals with the student's body, and the third,
which deals with another organism in nature. The second and fourth
selections deal with kindred aspects of modern industry--the manufacture
of paper and the Linotype machine, by which it is used. The fifth
selection is a protest against certain developments of the industrial
regime; the last, an attempt to reconcile the spirit of science with
that of religion. While monotony has been avoided, the essays form a
distinct unit.

In most cases, selections are longer than usual, long enough in fact to
introduce a student to each field. As a result, he can be made to feel
that every subject is of importance and to realize that every chapter
contains a fund of valuable information. Instead of confusing him by
having him read twenty selections in, let us say, six weeks, it is
possible by assigning but six in the same period, to impress him
definitely with each.

The text-book machinery has been sequestered in the Biographical and
Critical Notes at the end of the book. Their character and position are