NIPHER (F. E.) THEORY OF MAGNETIC MEASUREMENTS, WITH AN APPENDIX ON THE METHOD OF LEAST SQUARES. One volume. Crown 8vo. cloth, 5s.

PLANTÉ (G.) THE STORAGE OF ELECTRICAL ENERGY, and Researches in the Effects created by Currents combining Quantity with High Tension. Translated from the French by Paul Bedford Elwell. With Portrait, and 89 Illustrations. 8vo. pp. vii.-268, cloth, 12s.

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Whittaker’s Library of Arts, Sciences, Manufactures and Industries.

MANAGEMENT OF ACCUMULATORS AND PRIVATE ELECTRIC LIGHT INSTALLATIONS. A Practical Handbook by Sir David Salomons, Bart., M.A. 4th Edition, Revised and Enlarged, with 32 Illustrations. Cloth, 3s.

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ELECTRIC BELLS AND ALL ABOUT THEM. A Practical Book for Practical Men. By S. R. Bottone. With more than 100 illustrations. Cloth, 3s.

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