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THE

INTERNATIONAL SCIENTIFIC SERIES.

VOL. XXIIL

THE FORMS OF WATER IN CLOUDS AND RIVERS, ICE AND GLACIERS. By JOHN TYNDALL, LL.D., F.R.S. With 26 Illustrations. Seventh Edition. Crown 8vo, cloth, price 5s.

PHYSICS AND POLITICS; or, Thoughts on the Application of the Principles of Natural Selection and Inheritance to Political Society. By WALTER BAGEHOT. Third Edition. Crown 8vo, cloth, price 4s.

FOODS. By EDWARD SMITH, M.D., LL.B., F.R.S. Profusely Illustrated. Fourth Edition. Crown 8vo, cloth, price 5s.

MIND AND BODY: The Theories of their Relation. By ALEXANDER BAIN, LL.D., Professor of Logic at the University of Aberdeen. With 4 Illustrations. Fifth Edition. Crown 8vo, cloth, price 4s.

THE STUDY OF SOCIOLOGY. By HERBERT SPENCER. Sixth Edition. Crown 8vo, cloth, price 5s.

THE CONSERVATION OF ENERGY; being an Elementary Treatise on Energy and its Laws. By BALFOUR STEWART, M.A., LL.D., F.R.S. 14 Engravings. Third Edition. Crown 8vo, cloth, price 5s.

ANIMAL LOCOMOTION; or, Walking, Swimming, and Flying. By J. B. PETTIGREW, M.D., F.R.S. 130 Illustrations. Second Edition. Crown 8vo, cloth, price 5s. RESPONSIBILITY IN MENTAL DISEASE. BY HENRY MAUDSLEY, M.D., Fellow of the Royal College of Physicians. Second Edition. Crown 8vo, cloth, price 5s. THE NEW CHEMISTRY. By JOSIAH P. COOKE, Jun., Erving Professor of Chemistry and Mineralogy in Harvard College. 31 Illustrations. Third Edition. Crown 8vo, cloth, price 5s.

THE SCIENCE OF LAW. By SHELDON AMOS, M.A., Barrister-at-Law. Second Edition. Crown 8vo, cloth, price 5s.

ANIMAL MECHANISM. By E. J. MAREY, Professor at the College of France. 117 Illustrations. Second Edition. Crown 8vo, cloth, price 5s.

THE DOCTRINE OF DESCENT AND DARWINISM. By OSCAR SCHMIDT, Professor in the University of Strasburg. 26 Woodcuts. Third Edition. Crown 8vo, cloth, price 5s.

HISTORY OF THE CONFLICT BETWEEN RELIGION AND SCIENCE. By JOHN WILLIAM DRAPER, M.D., LL.D. Tenth Edition. Crown 8vo, cloth, price 5s. FUNGI: Their Nature, Influences, and Uses. By M. C. COOKE, M.A., LL.D. Edited by the Rev. M. J. BERKELEY, M.A., F.L.S. Profusely Illustrated. Second Edition. Crown 8vo, cloth, price 5s.

THE CHEMICAL EFFECTS OF LIGHT AND PHOTOGRAPHY. By HERMANN VOGEL, Ph.D., Polytechnic Academy of Berlin. 100 Illustrations. Third Edition, thoroughly revised. Crown 8vo, cloth, price 5s.

THE LIFE AND GROWTH OF LANGUAGE. By WILLIAM DWIGHT WHITNEY, Professor of Sanskrit and Comparative Philology in Yale College. Second Edition. Crown 8vo, cloth, price 5s.

MONEY AND THE MECHANISM OF EXCHANGE. By W. STANLEY JEVONS, M.A., F.R.S. Third Edition. Crown 8vo, cloth, price 58.

THE NATURE OF LIGHT with a General Account of Physical Objects. By EUGENE LOMMEL, Professor of Physics in the University of Erlangen. 188 Illustrations. Second Edition. Crown 8vo, cloth, price 5s.

ANIMAL PARASITES AND MESSMATES. By P. J. VAN BENEDEN, Professor at the University of Louvain. 83 Illustrations. Second Edition. Crown 8vo, cloth, price 58.

ON FERMENTATION. By P. SCHUTZENBERGER, Director of the Chemical Laboratory at Sorbonne. 28 Illustrations. Second Edition. Crown 8vo, cloth, price 5s. THE FIVE SENSES OF MAN. By JULIUS BERNSTEIN, Professor of Physiology in the University of Halle. 91 Woodcuts. Crown 8vo, cloth, price 5s.

THE THEORY OF SOUND IN ITS RELATION TO MUSIC. By Professor PIETRO BLASERNA, of the Royal University of Rome. With numerous Illustrations. Second Edition. Crown 8vo, cloth, price 5s.

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STUDIES IN

SPECTRUM ANALYSIS

Joseph

BY

J. NORMAN LOCKYER, F.R.S.

CORRESPONDENT OF THE INSTITUTE OF FRANCE, ETC., ETC.

LONDON

C. KEGAN PAUL & CO., I, PATERNOSTER SQUARE

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