60 cents.

WORLD BOOK COMPANY
YONKERS-ON-HUDSON, NEW YORK
2126 PRAIRIE AVENUE, CHICAGO

NEW-WORLD SCIENCE SERIES

_Edited by_ JOHN W. RITCHIE

The publication of books that "apply the world's knowledge to the
world's needs" is the ideal of this house and it is intended that the
different volumes of this series shall express this ideal in a very
concrete way.

_Completed_

Human Physiology. By _John W. Ritchie_, Professor of Biology, College
of William and Mary. A text on physiology, hygiene, and sanitation for
upper grammar or junior high schools. $1.28.

Laboratory Manual for Human Physiology. By _Carl Hartman_, University
of Texas. A manual to accompany Ritchie's Human Physiology. Price,
paper 48 cents, cloth 92 cents.

Science for Beginners. By _Delos Fall_, Albion College, Michigan. A
beginning text in general science for intermediate schools and junior
high schools. Price $1.40.

Exercise and Review Book in Biology. By _J. G. Blaisdell_, Yonkers, N.
Y., High School. A combined laboratory guide, notebook and review book
for students' use. Written from the standpoint of efficiency and
furnishing material for a year's work and to accompany any one of
several high-school texts in general biology. Price 96 cents.

Trees, Stars, and Birds. By _E. L. Moseley_, Ohio State Normal
College, Bowling Green. A book of outdoor science for junior high
schools and the upper grammar grades. Price $1.60.

Personal Hygiene and Home Nursing. By _Louisa C. Lippitt_, University
of Wisconsin. A practical text for use with classes of young women in
vocational and industrial high schools, colleges, and normal schools.
Price $1.40.

Science of Plant Life. By _E. N. Transeau_, Ohio State University. A
scientific and very practical text for high schools. Price $1.60.

Principles of zoology. By _T. D. A. Cockerell_, University of
Colorado. A text for college use. Price $3.00.

Experimental Organic Chemistry. By _A. P. West_, University of the
Philippines. A text for college use. Price $3.00.

_Ready at an Early Date_

Introductory Ideas in Science. By _Berenice Jenkins_.

Science of the Everyday World. By _Carleton W. Washburne_.

_Other volumes are also in preparation._

WORLD BOOK COMPANY
YONKERS-ON-HUDSON, NEW YORK
2126 PRAIRIE AVENUE, CHICAGO

School Efficiency Monographs

_Constructive educational books of handy size covering many
educational activities named in the order in