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PROCTOR.-WORKS by RICHARD A. PROCTOR.

OLD AND NEW ASTRO

NOMY. In 12 Parts. Price 2s. 6d. each; supplementary section, Is. ; complete, 36s. cloth.

LIGHT SCIENCE FOR

LEISURE HOURS; Familiar
Essays on Scientific Subjects,
Natural Phenomena, &c. 3 Vols.
crown 8vo, 5s. each.

THE ORBS AROUND US; a

Series of Essays on the Moon and Planets, Meteors, and Comets. With Chart and Diagrams, crown 8vo, 5s. Cheap Edition, crown 8vo, 3s. 6d. OTHER WORLDS THAN

OURS; The Plurality of Worlds
Studied under the Light of Recent
Scientific Researches.
With 14

Illustrations, crown 8vo, 5s. Cheap Edition, crown 8vo, 3s. 6d. THE MOON; her Motions, Aspects, Scenery, and Physical Condition. With Plates, Charts, Woodcuts, and Lunar Photographs, crown 8vo, 5s.

UNIVERSE OF STARS; Pre

senting Researches into and New Views respecting the Constitution of the Heavens. With 22 Charts and 22 Diagrams, 8vo. IOS. 6d. LARGER STAR ATLAS for the Library, in 12 Circular Maps, with Introduction and 2 Index Pages. Folio, 15s., or Maps only, 12s. 6d.

NEW STAR ATLAS for the

Library, the School, and the Observatory, in 12 Circular Maps (with 2 Index Plates). Crown Svo, 5s.

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and Woodcuts. Fcp. 8vo, 15. 6ď.

LESSONS IN ELEMENTARY
ASTRONOMY; with Hints for

Young Telescopists. With 47
Woodcuts. Fcp. 8vo, Is. 6d.

FIRST STEPS IN GEOME

TRY: a Series of Hints for the Solution of Geometrical Problems; with Notes on Euclid, useful Working Propositions, and many Examples. Fcp. 8vo, 3s. 6d. EASY LESSONS IN THE DIFFERENTIAL CALCU LUS indicating from the Outset the Utility of the Processes called Differentiation and Integration. Fcp. 8vo, 2s. 6d.

THE STARS IN THEIR SEASONS. An Easy Guide to a Knowledge of the Star Groups, in 12 Large Maps. Imperial 8vo, 5s.

STAR PRIMER. Showing the

Starry Sky Week by Week, in 24 Hourly Maps. Crown 4to, 25. 6a. ROUGH WAYS MADE SMOOTH. Familiar Essays on Scientific Subjects. Crown, 3s. 6d.

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PUBLISHED BY LONGMANS, GREEN & CO.

PROCTOR.-WORKS by RICHARD A. PROCTOR—continued.

STRENGTH: How to get Strong

and keep Strong, with Chapters
on Rowing and Swimming, Fat,
Age, and the Waist. With 9 Il-
lustrations. Crown 8vo, 2s.

THE EXPANSE OF HEAVEN.
Essays on the Wonders of the
Firmament. Crown 8vo, 5s.
Cheap Edition, crown 8vo, 3s. 6d.
THE GREAT PYRAMID, OB-

SERVATORY, TOMB, AND
TEMPLE. With Illustrations.
Crown 8vo, 5s.
PLEASANT WAYS IN
SCIENCE. Crown 8vo, 5s.
Cheap Edition, crown 8vo, 3s. 6d.

15

MYTHS AND MARVELS OF
ASTRONOMY. Crown 8vo, 5s.
Cheap Edition, crown 8vo, 3s. 6d.
CHANCE AND LUCK; a Dis-
cussion of the Laws of Luck,
Coincidences, Wagers, Lotteries,
and the Fallacies of Gambling,
&c. Crown Svo, 2s. boards,
2s. 6d. cloth.
NATURE STUDIES. By
GRANT ALLEN, A. WILSON,
T. FOSTER, E. CLODD, and
R. A. PROCTOR. Crown 8vo, 5s.
Cheap Edition, crown 8vo, 3s. 6d.
LEISURE READINGS. By E.
CLODD, A. WILSON, T. Foster,
A. C. RUNYARD, and R. A.
PROCTOR. Crown 8vo, 5s.

SLINGO AND BROOKER. ELECTRICAL ENGINEERING FOR ELECTRIC LIGHT ARTISANS AND STUDENTS. (Embracing those branches prescribed in the Syllabus issued by the City and Guilds Technical Institute.) By W. SLINGO, Principal of the Telegraphists' School of Science, &c., &c., and A. BROOKER, Instructor on Electrical Engineering at the Telegraphists' School of Science. With 307 Illustrations. Crown 8vo, 10s. 6d.

SMITH.

GRAPHICS; OR, THE ART OF CALCULATION BY DRAWING LINES, applied to Mathematics, Theoretical Mechanics and Engineering, including the Kinetics and Dynamics of Machinery, and the Statics of Machines, Bridges, Roofs, and other Engineering Structures. By ROBERT H. SMITH, Professor of Civil and Mechanical Engineering, Mason Science College, Birmingham.

PART I. Text, with separate Atlas of Plates-Arithmetic, Algebra, Trigonometry, Vector, and Locor Addition, Machine Kinematics, and Statics of Flat and Solid Structures. 8vo, 15s.

THORPE.

A DICTIONARY OF APPLIED CHEMISTRY. By T. E. THORPE, B.Sc. (Vict.), Ph.D., F.R.S., Treas. C.S., Professor of Chemistry in the Royal College of Science, London. Assisted by Eminent Contributors. To be published in 3 vols. 8vo. Vols. I. and II. £2 25. each, Vol. III. £3 35.

TYNDALL.-WORKS by JOHN TYNDALL, F.R.S., &c.
FRAGMENTS OF SCIENCE. 2 Vols. Crown 8vo, 16s.
NEW FRAGMENTS. Crown 8vo, 10s. 6d.

HEAT A MODE OF MOTION. Crown 8vo, 12s.

SOUND. With 204 Woodcuts. Crown 8vo, 10s. 6d.

RESEARCHES ON DIAMAGNETISM AND MAGNE-CRYS-
TALLIC ACTION, including the question of Diamagnetic Polarity.
Crown 8vo, 125.

ESSAYS ON THE FLOATING-MATTER OF THE

AIR

in relation to Putrefaction and Infection. With 24 Woodcuts. Crown 8vo, 7s. 6d.

LECTURES ON LIGHT, delivered in America in 1872 and 1873.
With 57 Diagrams. Crown 8vo, 5s.

LESSONS IN ELECTRICITY AT THE ROYAL INSTITU-
TION, 1875-76. With 58 Woodcuts. Crown 8vo, 2s. 6d.
NOTES OF A COURSE OF SEVEN LECTURES

ON

ELECTRICAL PHENOMENA AND THEORIES, delivered at
the Royal Institution. Crown 8vo, Is. 6d.

NOTES OF A COURSE OF NINE LECTURES ON LIGHT,
delivered at the Royal Institution. Crown 8vo, Is. 6d.
FARADAY AS A DISCOVERER.

Crown 8vo, 3s. 6d.

WATTS' DICTIONARY OF CHEMISTRY.

Revised and entirely

Re-written by H. FORSTER MORLEY, M.A., D.Sc., Fellow of, and lately
Assistant-Professor of Chemistry in, University College, Londen; and M. M.
PATTISON MUIR, M.A., F.R.S.E., Fellow, and Prælector in Chemistry,
of Gonville and Caius College, Cambridge. Assisted by Eminent Contributors.
To be Published in 4 Vols. 8vo. Vols. I. II. 42s. each.
Vol. IV. 635.
Vol. III. 50s.

WEBB. CELESTIAL OBJECTS FOR COMMON TELESCOPES.
By the Rev. T. W. WEBB, M. A., F.R.A.S., Vicar of Hardwick, Hereford-
shire. Fifth Edition, Revised and greatly Enlarged by the Rev. T. E.
ESPIN, M.A., F. R. A.S. (Two Volumes.)

VOL. I. With Portrait and a Reminiscence of the Author, 2 Plates, and numerous Illustrations. Crown Svo, 6s.

VOL. II. With Illustrations and Map of Star Spectra. Crown 8vo, 6s, 6ď.

WRIGHT.

OPTICAL PROJECTION: A Treatise on the Use of the Lantern in Exhibition and Scientific Demonstration. By LEWIS WRIGHT, Author of "Light a Course of Experimental Optics." With 232 Illustrations. Crown 8vo, 6s.

2500. 10.94.

BRADBURY, AGNEW, & CO. LD., PRINTERS, WHITEFRIARS.

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