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Gas Manufacture (The Chemistry of). A Handbook on the Production, Purification, and Testing of Illuminating Gas, and the Assay of Bye-Products. By W. J. A. BUTTERFIELD, M.A., F.I.C., F.C.S. With Illustrations. THIRD EDITION, Revised. Vol. I., 7s. 6d. net. Vol. II., in preparation. [See page 77 Water Supply: A Practical Treatise on the Selection of Sources and the Distribution of Water. By REGINALD E. MIDDLETON, M. Inst.C.E., M. Inst. Mech. E., F.S.I. With Four Plates and Numerous Diagrams. Crown 8vo. 8s. 6d. net.

[See page 77. Central Electrical Stations: Their Design, Organisation, and Management. By C. H. WORDINGHAM, A. K. C., M. Inst.C.E. SECOND EDITION. 24s net. For details see opposite page.

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[See page 79 Light Railways at Home and Abroad. By WILLIAM HENRY COLE, M.Inst.C.E., late Deputy Manager, North-Western Railway, India. Large 8vo, Handsome Cloth, Plates and illustrations. 16s. [See page 30. Practical Sanitation: A Handbook for Sanitary Inspectors and others interested in Sanitation. By GEO. REID, M.D., D.P. H., Medical Officer, Staffordshire County Council. With Appendix on Sanitary Law, by Herbert Manley, M.A., M. B., D. P. H. ELEVENTH EDITION, Thoroughly Revised. 6s. [See page 78. Sanitary Engineering: A Practical Manual of Town Drainage and Sewage and Refuse Disposal. By FRANCIS WOOD, A.M.Inst. C.E., F.G.S., Borough Surveyor, Fulham. Fully Illustrated. 8s. 6d. net. [See page 78. Dairy Chemistry: A Practical Handbook for Dairy Managers, Chemists, and Analysts. By H. DROOP RICHMOND, F.C.S., Chemist to the Aylesbury Dairy Company. With Tables, Illustrations, &c. Handsome Cloth, 16s. [See page 73. Milk: Its Production and Uses. With Chapters on Dairy Farming, The Diseases of Cattle, and on the Hygiene and Control of Supplies. By EDWArd f. WILLOUGHBY, M.D. (Lond.), D.P.H. (Lond. and Camb.), Inspector of Farms and General Scientific Adviser to Welford & Sons, Ltd. 6s. net. [See page 73. Flesh Foods: With Methods for their Chemical, Microscopical, and Bacteriological Examination. A Handbook for Medical Men, Inspectors, Analysts, and others. By C. AINSWORTH MITCHELL, B.A., F.I.C., Mem. Council Soc. of Public Analysts. With numerous Illustrations and a coloured Plate. 10s. 6d. (See page 73. Foods: Their Composition and Analysis. By A. WYNTER BLYTH, M.R.C.S., F.C.S., Public Analyst for the County of Devon, and M. W_BLYTH, B.A., B.SC. With Tables, Folding Plate, and Frontispiece. FIFTH EDITION, Thoroughly Revised. 21s. [See page 72.

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CENTRAL ELECTRICAL STATIONS:

Their Design, Organisation, and Management. BY CHAS. H. WORDINGHAM, A.K.C., M. INST.C.E., M. INST. MECH.E., Late Memb. of Council Inst. E. E., and Electrical Engineer to the City of Manchester; Electrical Engineer-in-Chief to the Admiralty.

ABRIDGED CONTENTS.

Introductory.-Central Station Work as a Profession.-As an Investment.-The Establishment of a Čentral Station -Systems of Supply.-Site.-Architecture.-Plant. -Boilers Systems of Draught and Waste Heat Economy.-Coal Handling, Weighing, and Storing.The Transmission of Steam. - Generators.- Condensing Appliances. - Switching Gear, Instruments, and Connections.-Distributing Mains.-Insulation, Resistance, and Cost.Distributing Networks. Service Mains and Feeders. - Testing Mains. - Meters and Appliances.-Standardising and Testing Laboratory.-Secondary Batteries.-Street Lighting. - Cost. - General Organisation -Mains Department. - Installation Department. Standardising Department.- Drawing Office - Clerical Department. The Consumer.Routine and Main Laying.-INDEX.

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ELECTRICITY CONTROL.

A Treatise on Electricity Switchgear and Systems of Transmission. BY LEONARD ANDREWS, M.I.E.E.,

Ex-Member of Council of the Incorporated Municipal Electrical Association; Consulting Electrical Engineer to the Hastings Corporation, &c., &c.

General Principles of Switchgear Design. -Constructional Details. -Circuit Breakers or Arc Interrupting Devices.-Automatically Operated Circuit Breakers.-Alternating Reverse Current Devices. — Arrangement of 'Bus Bars, and Apparatus for Parallel Running.. General Arrangement of Controlling Apparatus for High Tension Systems. - General Arrangement of Controlling Apparatus for Low Tension Systems.-Examples of Complete Installations.-Long Distance Transmission Schemes.

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A TEXT-BOOK OF PHYSICS.

PROPERTIES OF MATTER. CONTENTS.Gravitation. - The Acceleration of Gravity. - Elasticity. Stresses and Strains.-Torsion.-Bending of Rods.-Spiral Springs.- Collision.-Compressibility of Liquids.-Pressures and Volumes of Gases.-Thermal Effects Accompanying Strain.Capillarity.-Surface Tension.-Laplace's Theory of Capillarity.-Diffusion of Liquids Diffusion of Gases. - Viscosity of Liquids.-INDEX.

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SOUND.

CONTENTS.-The Nature of Sound and its chief Characteristics.-The Velocity of Sound in Air and other Media.-Reflection and Refraction of Sound.-Frequency and Pitch of Notes.-Resonance and Forced Oscillations.-Analysis of Vibrations.-The Transverse Vibrations of Stretched Strings or Wires. -Pipes and other Air Cavities.-Rods.-Plates. -Membranes.-Vibrations maintained by Heat.-Sensitive Flames and Jets.-Musical Sand.-The Superposition of Waves.- INDEX.

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CONTENTS.-Temperature. - Expansion of Solids-Liquids. - Gases. - Circulation and Convection.-Quantity of Heat; Specific Heat.-Conductivity.-Forms of Energy; Conservation; Mechanical Equivalent of Heat.-The Kinetic Theory -Change of State; Liquid Vapour.-Critical Points. Solids and Liquids. - Atmospheric Conditions. Radiation.-Theory of Exchanges. -Radiation and Temperature.-Thermodynamics.Isothermal and Adiabatic Changes.-Thermodynamics of Changes of State, and Solutions.-Thermodynamics of Radiation.-INDEX.

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LIGHT; MAGNETISM AND ELECTRICITY.

THE MEAN DENSITY OF THE EARTH: An Essay to which the Adams Prize was adjudged in 1893 in the University of Cambridge. By J. H. POYNTING, Sc.D., F.R.S., Late Fellow of Trinity College, Cambridge; Professor of Physics, Birmingham University. In Large 8vo, with Bibliography, Illustrations in the Text, and Seven Lithographed Plates. 12s. 6d.

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Physical Geology and Palæontology,

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OPEN-AIR STUDIES IN GEOLOGY:

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