ELECTRICIDAD Y MAGNETISMO.

ALLSOP (F. C.): Practical Electric Light Fitting. 200 Illustrations. $1.50.

BENNETT: The Telephoning of Great Cities. Paper. 35 cents.

BLAKESLEY: Alternating Currents of Electricity. Third Edition, Enlarged. (In the Press.)

BONNEY (G. E.): Induction Coils. $1.00.

Experimentos. Un manual de entretenimiento instructivo. Con 144 ilustraciones. 12mo. 75 centavos.

• BOTTONE (S. R.): Electricity and Magnetism. With 103 Illustrations. 16mo. 90 cents.

to Manage the Dynamo. A Handbook for Ship Engineers, Electric Light Engineers, etc. 16mo. 60 cents.

Guía de alumbrado eléctrico. Por S. R. Bottone, autor de "Timbres eléctricos y todo lo relacionado con ellos", "Electromotores: cómo se hacen y cómo se usan", etc. Con numerosas ilustraciones. 75 centavos.

CAVENDISH: The Electrical Researches of the Honourable Henry Cavendish, F.R.S. Written between 1771 and 1781. Edited from the original manuscripts of the late J. Clerk Maxwell, F.R.S. 8vo. $5.00.

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, M.A., 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.

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: Electricidad y Magnetismo. Tratado popular. Por Amédée Guillemin, autor de «Las fuerzas de la naturaleza», «Las aplicaciones de las fuerzas físicas», etc. Traducido y editado, con adiciones y notas, por el profesor Silvanus P. Thompson, autor de «Lecciones elementales de electricidad y magnetismo», etc. Con 600 ilustraciones. Super royal 8vo. $8.00.

HAWKINS y WALLIS: The Dynamo. Its Theory, Design, and Manufacture. Por C. C. Hawkins y F. Wallis. Con 190 ilustraciones. $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.