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NEW SERIES
Vol. LIII, No. 1380

FRIDAY, JUNE 10, 1921

SINGLE COPIES, 15 CTS
ANNUAL SUBSCRIPTION, $6.00

Philosophy And The New hysics

Palo Alto Calle
John F. Newsom,

1129 Cowper Street,

Discussion of The Relativity Theory and The The Quanta By Louis ROUGIER, Professeur Agrégé De Philosophie, Docte Cettres. Au

thorized Translation from the Author's Corrected T y MORTON MASIUS, M.A., Ph.D., Professor of Physics, Worcester Po ic Institute; Translator of M. Planck's "Theory of Radiation."

759 Pages. Cloth, $1.75 Postpaid.

The recent remarkable developments of physical theories, ully those concerned with relativity and quanta of energy, cannot fail to haur-reaching influences on philosophical thought. Professor Rougier's very wide reading in mathematical and experimental physics has enabled him to present and interpret the new advances in physics in a way which should prove of great interest to both philosopher and physicist. The book marks a measurable advance toward a confluence of the broad streams of philosophical and scientific enquiry.

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Chemical Reactions And Their Equations

The General Principles of Balancing Equations By INGO W. D. HACKH, Ph.C., A.B., Professor of Biochemistry, College of Physi

cians and Surgeons, San Francisco. 12mo, viïi + 138 Pages. Cloth, $1.75 Postpaid.

A detailed study of this volume will enable anyone to balance any chemical equation rapidly and correctly.

Introduction To General Chemistry.

An Exposition of the Principles of Modern Chemistry
By H. COPAUX, Professor of Mineral Chemistry, School of Industrial Physics

and Chemistry, Paris. Translated by and with Appendix by HENRY
LEFFMANN, A.M., M.D., Member American Chemical Society and of the
British Society of Public Analysts. 30 Illustrations, 12mo, x + 195 Pages.
Cloth, $2.00, Postpaid.

A new presentation of the fundamental laws of the atom and of chemical affinity calculated to clarify all difficulties.

P. Blakiston's Son & Co., Publishers, Philadelphia

TOLMAN

Theory of the Relativity

of Motion With Appendix

In the New Spirit of Science
MILLIKAN AND GALE
PRACTICAL PHYSICS

A supplement to this work, written by the
author, has just been issued. Under the
title,
Relativity Theories in Physics
this Appendix gives a general description
of the nature of relativity theories, to-
gether with brief discussions of Tolman's
theory of similitude or relativity of size;
of Einstein's theory of the relativity of
uniform motion, and of Einstein's theory
of gravity and general relativity.
ix + 242 pages (including Appendix).
Cloth, $1.75. Carriage extra. Weight,
1% pounds.

Appendix only (paper), 25 cents.
The University of California Press

BERKELEY, CALIFORNIA

Founded on the belief that the pupil should be thoroughly grounded in the fundamentals of physics, it makes the pupil alive to the practical, everyday value of the subject. It is based on the authors' “First Course in Physics,” the most widely used textbook in the subject. Here is a book that is vitally interesting to the high school boy or girl, a book that arouses and maintains enthusiasm.

GINN AND COMPANY 70 Fifth Ave. New York

NOW WILEY BOOKS READY

PRINCIPLES OF RADIO COMMUNICATION

By J. H. MORECROFT
Associate Professor of Electrical Engineering, Columbia University

Assisted by A. PINTO and W. A. CURRY Deals with all phases of the Radio Art, from the standpoints of both theory and operation. The theory of alternating currents in the steady state is reviewed, with especial emphasis on those ideas which underlie the operation of radio circuits. 935 pages, 6 by 9 inches, 788 illustrations and oscillographic records of transient

phenomena-cloth, $7.50 postpaid.

FIELD MAPPING FOR THE OIL GEOLOGIST

By C. A. WARNER Field Geologist, Empire Gas & Fuel Co., Bartlesville, Okla. A book of practical field methods of value to those geologists who have had little experience with the methods commonly used in examining a territory not yet drilled. 143 pages, 41 by 7 inches, 38 figures—flexibly bound, $2.50 postpaid.

Send NOW for Free Examination copies

JOHN WILEY & SONS, Inc.

432 Fourth Avenue

NEW YORK

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In making a determination of the H-ion concentration of a solution by the electrometric method, the actual measurement is one of potential difference, or voltage, between a hydrogen and a calomel electrode in contact with the solution. The H-ion concentration, or the Ph value, must then be found by reference to conversion tables or by calculation from an equation.

The H-ion Calculator is a slide rule, which, with one setting, converts the measured voltage into the corresponding Ph or Ch+ values. The conversion may be made accurately to the second decimal place.

The Calculator is very quick and convenient in operation. It is made of heavy celluloid, and measures 6 inches by 6 inches.

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ANATOMIST wants position. Eminently prepared to teach all branches pertaining to medicine (histology, embryology, neurology, gross anatomy and cross sec. tions). Present salary $2400. Will not change for less than $3000. Best of recommendations. Address "Q" Care of Science, Garrison, N. Y.

THE COCCIDAE Tables for the Identification of the Subfamilies and Some of the More Important Genera and Species Together with Discussions of Their Anatomy and Life History

By ALEX. D. MacGILLIVRAY Ph.D. Prof. of Systematic Entomology in the University of Nlinois

Chapters devoted to near relatives of Coccids, Preparation, External Anatomy, Classification, and to each of the Subfamilies and Tribes, Twenty-seven in all.

8vo. Cloth. IX+502. $6.00 net Sent prepaid upon receipt of price. Onder direct from publisher

SCARAB COMPANY 603 Michigan Ave.

Urbana, Illinois

WANTED, Instructor in Mathematics and Astronomy

to take the place of a professor on leave of absence for the college year 1921-22. Salary $2,000. Instructor will have charge of new Warner & Swasey Observatory and will be expected to teach practical astronomy as well as some classes in mathematics. President, CASE SCHOOL OF APPLIED SCIENCE

Cloveland, Ohio

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THIRD EDITION-NOW READY

AMERICAN MEN OF SCIENCE

A BIOGRAPHICAL DIRECTORY

EDITED BY J. McKEEN CATTELL AND DEAN R. BRIMHALL

The third edition of the Directory contains about 9,600 sketches as compared with 4,000 in the first edition and 5,500 in the second edition. The work should be in the hands of all those who are directly or indirectly interested in scientific work.

(1) Men of Science will find it indispensable. It gives not only the names, addresses, scientific records and the like of their fellow workers, but also an invaluable summary of the re, search work of the country, completed and in progress.

(2) Those interested in science, even though they may not be professionally engaged in research work, will find much of interest and value to them in the book.

(3) Executives in institutions of learning and others brought into relations with scientific men will use the book constantly.

(4) Editors of Newspapers and periodicals will find it to be one of the works of reference that they will need most frequently. (5) Libraries will find the book to be a necessary addition to their reference shelves.

Price, Teo Dollars, Net, Postage Paid

THE SCIENCE PRESS GARRISON, N. Y.

LANCASTER, PA.

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