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The English Historical Review Advertiser, October 1921. 5 Messrs. Longmans & Co.'s Scientific List New Edition of Thorpe's Dictionary of Chemistry. A DICTIONARY OF APPLIED CHEMISTRY By Sir EDWARD THORPE, C.B., LL.D., F.R.S. With Illustrations. Royal 8vo. Vol. I. A to Calcium. 60s. net. [Ready Vol. II. Calculi to Explosion. 60s. net. [Ready Vol. III. In the Press. MONOGRAPHS ON INDUSTRIAL CHEMISTRY. Edited by Sir Edward Thorpe, C.B., LL.D., F.R.S. THE ELECTRIC FURNACE By J. N. PRING, M.B.E., D.Sc, Research Department, -Royal Arsenal, Woolwich. With Illustrations. 8vo, 32s. net. TEXTILE DESIGN AND COLOUR By WJLLIAM WATSON, Royal Technical College, Glasgow. With 421 Diagrams. 8vo. Second Edition, with an Appendix on Standard Yarns, Weaves, and Fabrics. 21s. net. COTTON SPINNING CALCULATIONS AND YARN COSTS By JAMES WINTERBOTTOM. With Diagrams. Second Edition. 8vo. 14s. net. THE ROTHAMSTED MONOGRAPHS ON AGRICULTURAL SCIENCE. Edited by Dr. E. J. Russell, D.Sc, F.R.S. SOIL CONDITIONS AND PLANT GROWTH By EDWARD J. RUSSELL, D Sc.(Lond.), F.R.S. Fourth Edition. With Illustrations. 8vo. 16s. net. MONOGRAPHS ON PHYSICS. THE PHYSICAL PROPERTIES OF COLLOIDAL SOLUTIONS By E. F. BURTON, B.A., Ph.D. With 18 Illustrations. Second Edition. 8vo. 12s. 6d. net. THE CASE-HARDENING OF STEEL An Illustrated Exposition of the Changes in Structure and Properties induced in Steels by Cementation and Allied Processes By HARRY BREARLEY. 8vo. Second Edition. 16s.net. LONGMANS' ELECTRICAL ENGINEERING SERIES. THE DIAGNOSING OF TROUBLES IN ELECTRICAL MACHINES By MILES WALKER, M.A., D.Sc, M.I.E.E. With Illustrations. 8vo. 32s. net. POWER HOUSE DESIGN By Sir JOHN F. C. SNELL, M.Inst.C.E. With 20 Plates and 202 Illustrations. Second Edition* 8vo. 42s. net. LOITGrMAITS 3 GREEN <& CO 39 PATERNOSTER ROW, LONDON, E.C.4. Fourth Avenue and 30th Street, New York.