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CUMMING.—ELECTRICITY TREATED EXPERIMENTALLY.

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DU BOIS.—THE MAGNETIC CIRCUIT IN THEORY AND PRACTICE. By Dr. H. Du Bois, Privatdocent in the University of Berlin. Translated by E. Atkinson, Ph.D. With 94 Illustrations. 8vo., 12s. net.

EBERT.—MAGNETIC FIELDS OF FORCE: an Exposition of the Phenomena of Magnetism, Electro-Magnetism and Induction, based on the Conception of Lines of Force. By H. Ebert, Professor of Physics in the University of Kiel. Translated by C. V. Burton, D.Sc. Part I. With 93 Illustrations. 8vo., 10s. 6d. net.

GORE.—THE ART OF ELECTRO-METALLURGY, including all known Processes of Electro-Deposition. By G. Gore, LL.D., F.R.S.