all statements correct and
accurate _as far as they go_. Many of them are necessarily incomplete,
on account of the elementary character of the work; but it is hoped
that this incompleteness has never been allowed to become untruth, and
that the pupil will not afterwards have to unlearn anything the book
has taught him.

In the text no mathematics higher than elementary algebra and geometry
is introduced; in the foot-notes and in the Appendix an occasional
trigonometric formula appears, for the benefit of the very
considerable number of high school students who understand such
expressions. This fact should be particularly noted, for it is a
special aim of the book to teach astronomy scientifically without
requiring more knowledge and skill in mathematics than can be expected
of high school pupils.

Many things of real, but secondary, importance have been treated of in
fine print; and others which, while they certainly ought to be found
within the covers of a high school text-book of astronomy, are not
essential to the course, are relegated to the Appendix.

A brief URANOGRAPHY is also presented, covering the constellations
visible in the United States, with maps on a scale sufficient for the
easy identification of all the principal stars. It includes also a
list of such telescopic objects in each constellation as are easily
found and lie within the power of a small telescope.

_Plant Organization._

By R. HALSTED WARD, M.D., F.R.M.S., Professor of Botany in the
Rensselaer Polytechnic Institute, Troy, N.Y. Quarto. 176 pages.
Illustrated. Flexible boards. Mailing Price, 85 cents; for Introd.,
75 cents.

It consists of a synoptical review of the general structure and
morphology of plants, clearly drawn out according to biological
principles, fully illustrated, and accompanied by a set of blanks for
written exercises by pupils. The plan is designed to encourage close
observation, exact knowledge, and precise statement.

_A Primer of Botany._

By Mrs. A. A. KNIGHT, of Robinson Seminary, Exeter, N.H. 12mo.
Boards. Illus. vii + 115 pp. Mailing Price, 35 cents; for Introd.,
30 cents.

This Primer is designed to bring physiological botany to the level of
primary and intermediate grades.

_Outlines of Lessons in Botany._

For the use of teachers, or mothers studying with their children. By
Miss JANE H. NEWELL. Part I.: From Seed to Leaf. Sq. 16mo. Illus.
150 pp. Cloth. Mailing Price, 55