The information in this volume is thoroughly practical and reliable, and the entire process of manufacture is clearly explained, each stage being treated separately and in detail, while much valuable information will be found in chapters dealing with design, patterns, inspection, machining, supplementary processes, and the application of the material, the use of which has increased so enormously within the last few years that it is now preferred to steel for many purposes. It is freely illustrated with photographs and line drawings, and will be invaluable to the professional man and the student. THE PRECIOUS METALS: COMPRISING GOLD, SILVER, AND PLATINUM. By T. KIRKE ROSE, A.R.S.M., D.Sc. Extra Crown 8vo. 6_s._ net. CONTENTS:--History of Gold--Properties of Gold--Compounds of Gold--Alloys of Gold--Occurrence of Gold in Nature: Gold Ores--Extraction of Gold from its Ores: Gold Washing--Treatment of Gold Ores by Crushing and Amalgamation--Treatment of Gold Ores by Wet Methods--Silver and its Alloys--Compounds and Ores of Silver--The Extraction of Silver from its Ores--Refining Gold and Silver--The Assay of Gold and Silver Ores--The Assay of Gold and Silver Bullion--Minting--Manufacture of Gold and Silver Wares--Platinum--Production and Consumption of the Precious Metals. AGRICULTURE SOILS AND MANURES. By J. ALAN MURRAY, B.Sc. Demy 8vo. 6_s._ net. CONTENTS:--Preface. Chapter I.--Introductory. Chapter II.--The Origin of Soils. Chapter III.--Physical Properties of Soils. Chapter IV.--Chemistry of Soils. Chapter V.--Biology of Soils. Chapter VI.--Fertility. Chapter VII.--Principles of Manuring. Chapter VIII.--Phosphatic Manures. Chapter IX.--Phospho-Nitrogenous Manures. Chapter X.--Nitrogenous Manures. Chapter XI.--Potash Manures. Chapter XII.--Compound and Miscellaneous Manures. Chapter XIII.--General Manures. Chapter XIV.--Farmyard Manure. Appendices.--I. Valuation of Manures; II. Composition and Manurial Value of Various Farm Foods. Index. BOTANY PLANT PHYSIOLOGY AND ECOLOGY. By FREDERIC EDWARD CLEMENTS, Ph.D., Professor of Botany in the University of Minnesota. With 125 Illustrations. Demy 8vo. 10_s._ 6_d._ net. TIMBER. By J. R. BATERDEN, Assoc.M.Inst.C.E. Profusely Illustrated from Photographs and Diagrams. Extra Crown 8vo. 6_s._ net. This is essentially a practical work, and botany is only incidentally touched upon. The timbers dealt with are those in most general use, either in their native districts or in the timber trade, together with some others which are likely before long to come into the market. CYTOLOGY