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CUMMING: An Introduction to the Theory of Electricity. By Linnæus Cumming, M.A. With Illustrations. 12mo. $2.25.

DAY: Electric Light Arithmetic. By R. E. Day, M.A. 18mo. 40 cents.

EMTAGE: An Introduction to the Mathematical Theory of Electricity and Magnetism. By W. T. A. Emtage, MA., of Pembroke College, Oxford. 12mo. $1.90.

GRAY: The Theory and Practice of Absolute Measurements in Electricity and Magnetism. By Andrew Gray, M.A., F.R.S.E. In two volumes. Vol. I., 12mo. $3.25. Vol. II. (in two parts). $6.25.

Absolute Measurements in Electricity and Magnetism for Beginners. By Andrew Gray, M.A., F.R.S.E. Students' Edition, Abridged from the larger work. 16mo. $1.25.

GUILLEMIN: Electricity and Magnetism. A Popular Treatise. By Amédée Guillemin, author of "The Forces of Nature," " The Applications of Physical Forces," etc. Translated and edited, with Additions and Notes, by Professor Silvanus P. Thompson, author of "Elementary Lessons in Electricity and Magnetism," etc. With 600 Illustrations. Super royal 8vo. $8.00.

HAWKINS and WALLIS: The Dynamo. Its Theory, Design, and Manufacture. By C. C. Hawkins and F. Wallis. With 190 Illustrations. $3.00.

HEAVISIDE (Oliver): Electrical Papers. For Advanced Students in Electricity. 2 vols. 8vo. $10.00.

HERTZ (H.): Researches in the Propagation of Electrical Forces. Authorized Translation by D. E. Jones, B.Sc. Illustrated. 8vo. $3.00.

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LODGE (Oliver J.): Modern Views of Electricity. By Oliver J. Lodge, LL.D., D.Sc., F.R.S. Illustrated. $2.00.

Lightning Conductors and Lightning Guards. With Numerous Illustrations. $4.00.

MAXWELL: An Elementary Treatise on Electricity. By James Clerk Maxwell, M.A. Edited by William Garnett, M.A. Second Edition. 8vo. $1.90.

A Treatise on Electricity and Magnetism. By James Clerk Maxwell, M.A. 2 vols. 8vo. Second Edition. $8.00. Supplementary volume, by J. J. Thomson, M.A. $4.50.

MAYCOCK: A First Book of Electricity and Magnetism. For the Use of Elementary Science and Art and Engineering Students and General Readers. By W. Perren Maycock, M.I.E.E. With 84 Illustrations. Crown 8vo. 60 cents.

Electric Lighting and Power Distribution. Illustrated. Complete in three parts. 16mo. Paper. 75 cents each.

MURDOCK: Notes on Electricity and Magnetism. Designed as a companion to Silvanus P. Thompson's "Elementary Lessons in Electricity and Magnetism." By J. B. Murdock, Lieut. U.S.N. 18mo. New Edition. 60 cents.

POOLE: The Practical Telephone Handbook. By Joseph Poole. With 227 Illustrations. Small crown 8vo. $1.00.