ss telegraphy, 1, 112.

Young, C.A., on Olbers's theory of asteroids, 142.
on temperature of Mars, 122.
on Venus's atmosphere, 53.

Zodiac, the, 258.

THE END

A NEW BOOK BY PROF. GROOS.

The Play of Man.

By KARL GROOS, Professor of Philosophy in the University of Basel, and
author of "The Play of Animals." Translated, with the author's
cooperation, by Elizabeth L. Baldwin, and edited, with a Preface and
Appendix, by Prof. J. Mark Baldwin, of Princeton University. 12mo.
Cloth, $1.50 net; postage, 12 cents additional.

The results of Professor Groos's original and acute investigations
are of peculiar value to those who are interested in psychology and
sociology, and they are of great importance to educators. He
presents the anthropological aspects of the subject treated in his
psychological study of the Play of Animals, which has already
become a classic. Professor Groos, who agrees with the followers of
Weismann, develops the great importance of the child's play as
tending to strengthen his inheritance in the acquisition of
adaptations to his environment. The influence of play on character,
and its relation to education, are suggestively indicated. The
playful manifestations affecting the child himself and those
affecting his relations to others have been carefully classified,
and the reader is led from the simpler exercises of the sensory
apparatus through a variety of divisions to inner imitations and
social play. The biological, aesthetic, ethical, and pedagogical
standpoints receive much attention from the investigator. While
this book is an illuminating contribution to scientific literature,
it is of eminently practical value. Its illustrations and lessons
will be studied and applied by educators, and the importance of
this original presentation of a most fertile subject will be
appreciated by parents as well as by those who are interested as
general students of sociological and psychological themes.

D. APPLETON AND COMPANY, NEW YORK.

D. APPLETON AND COMPANY'S PUBLICATIONS.

RICHARD A. PROCTOR'S WORKS.

_OTHER WORLDS THAN OURS: The Plurality of Worlds, Studied under the
Light of Recent Scientific Researches._ With Illustrations, some
colored. 12mo. Cloth, $1.75.

CONTENTS.--Introduction.--What the Earth teaches us.--What we learn
from the Sun.--The Infer