The Electromagnet. By C. R. Underhill. 67 illus., 159 pp., crown 8vo. (New York, 1903.) 6s. 6d. net.

Practical Guide to the Testing of Insulated Wires and Gables. By H. L. Webb. Fifth edition, 38 illus., 118 pp., crown 8vo. (New York, 1902.) 4s. 6d. net.

Wiring Rules. With Extracts from the Board of Trade Regulations and the Home Office Regulations for Factories and Workshops. Issued by The Institution of Electrical Engineers. Sixth edition, 42 pp., 8vo, sewed. (1911.) 6d. net.

FOREIGN EXCHANGE

English Prices with Russian Equivalents (at Fourteen Rates of Exchange). English prices per lb., with equivalents in roubles and kopecks per pood. By A. Adiassewich. 182 pp., fcap. 32mo. 1s. net.

English Prices with German Equivalents (at Seven Rates of Exchange). English Prices per lb., with equivalents in marks per kilogramme. By St. Koczorowski. 95 pp., fcap. 32mo. 1s. net.

English Prices with Spanish Equivalents. At Seven Rates of Exchange. English prices per lb., with equivalents in pesetas per kilogramme. By S. Lambert. 95 pp., 32mo. 1s. net.

English Prices with French Equivalents (at Seven Rates of Exchange). English prices per lb. to francs per kilogramme. By H. P. McCartney. 97 pp., 32mo. 1s. net.

Principles of Foreign Exchange. By E. Matheson. Fourth edition, 54 pp., 8vo, sewed. (1905.) 3d. net.