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Downing's Famous Book Revised

LANDSCAPE GARDENIN

By ANDREW JACKSON DOWNING

Tenth Edition, Revised

By FRANK A. WAUGH, M.Sc.

Professor of Landscape Gardening, Head of Department Head of Division of Horticulture, Massachusetts Agricultural

Including Many Chapters from Downing's "Rural Essa

N presenting this new edition of Downing's "Landscape Gardening" Pro brought together from all of Mr. Downing's writings the best portions of directly on this important subject.

Those who have country places of their own, whether large or small, w clearly written text-matter of this masterful work and the practical assistanc in beautifying their grounds.

Downing & Waugh's "Landscape Gardening" has 439 pages, 6 by 9 i illustrated, showing typical examples. Cloth-bound, $6.00 postpaid.

JOHN WILEY & SONS, Inc.

432 Fourth Avenue

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How Intense Is Sunlight

Its intensity, of course, depends upon latitude, season, time of day, atmospheric conditions; but whatever it happens to be, it can be measured readily with

Leeds & Northrup Company's

MACBETH ILLUMINOMETER

Illumination of any intensity, artificial or natural, is within the range of this useful instrument. Its scale reads foot-candles directly. It is provided with a reference standard lamp with which each observer standardizes the instrument according to his own visual perception. This is done wherever he happens to be-no photometric dark room is required.

The illustration shows one method for making a measurement. The illumination on the test-plate, mounted on a tripod, is being measured. A translucent plate, mounted in

a "horn", can be fitted to the instrument, and by pointing the "horn", in any direction, up, down or sidewise, the illumination due to the light from that direction is measured.

The Macbeth Illuminometer is especially suited for investigations concerned with the reactions of living organisms to light.

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GOERZ POLARISCO

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With Lippich Polarizer, adjustable half shad Scale can be accurately read to 1/100th degree.

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Repeated object lessons have demonstrated that nearly all progress in science has resulted in important advances in industry

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G-E Research Laboratory
Schenectady, N. Y.

Among the many products developed by the General
Electric Company's research laboratories which are of
interest to manufacturers are the following:

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For further information address Supply Department, Schenectady Office.

General Electric

General Office
Schenectady, NY.

Company

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vi

Instructive Books on Timely Su

Mysticism, Freudian- Sex and Sex W

ism and Scientific
Psychology

By KNIGHT DUNLAP, Professor of Psychology
at Johns Hopkins University, Baltimore. Author
of "Personal Beauty and Racial Betterment,"
etc. 150 pages, with special jacket. Price, $1.50.
This timely book analyzes the current Freudian
movement in detail, and states in the light of
analysis the fundamental principles of present
day psychology. Written in popular style.

Personal Beauty and
Racial Betterment

By KNIGHT DUNLAP, Professor of Experimental
Psychology in Johns Hopkins University, Balti-
100 pp., with beautiful jacket.
more, etc.
cloth binding. Price, net, $1.00.

Silk

A brief and clear presentation of the central problems of eugenics as seen from the viewpoint of physiological psychology.

The Sexual Life

318 pages, 6 x 9,
By C. W. MALCHOW, M.D.
printed on light weight paper, with beautiful
cloth binding. Fifth revised and enlarged edi-
tion. Price, postpaid, $3.00.

A Scientific Treatise designed for advanced
students and the professions, embracing the
natural sexual impulse, normal sexual habits
and propagation, together with sexual phys-
This book is recom-
iology and hygiene.
mended by the American Association of Social
Hygiene in its reading course.

By O. A. WALL, M.D., Ph.G., P
i
6 x 94, with 375 beautiful
cluding line drawings, half-tor
printed on special sepia paper
silk binding and gold stampir
and front cover. Price, cloth, P
A Scientific Treatise on Sex,
Function, and Its Influence o
Literature, Architecture, and
Special Reference to Sex Wo
bolism. The first treatise that
Worship and Symbolism in con
evolution of the human body a

Sex Attraction

By VICTOR C. VAUGHAN, M.D the Medical School of Univers Lecture delivered before State Michigan. 64 pages, beautifull Price, stock with heavy cover.

Not a brochure on venereal dis
in a broad way the physiologic
the sexes.

Suggestive
Therapeutic

Applied Hypnotism and Ps

By HENRY S. MUNRO, M.D. with frontispiece. Fourth revi edition. Price, silk cloth bindin A manual of practical psycho for practitioners of medicine, tistry. The various cults and curers and hypnotists and th ulars who do business in this region are studied as scienti fictions are pointed out.

You should order copies of these important books today through your direct from the publishers. Also request a copy of our complete catalogue of 1 tal, scientific, pharmaceutical, and nursing publications. Mention "Science" v or ordering.

THE C. V. MOSBY COMPANY

801-809 Metropolitan Building

ST. I

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