_The Journal of the Faraday Society._--"This book cannot be too strongly recommended." _Educational News._--"Most valuable." _The Lancet._--"The true educational method is set forth in this little work." _Journal of Education._--"It is useful both to teacher and to pupil." EXERCISES IN PHYSICAL CHEMISTRY. By W. A ROTH, Ph.D., etc., Late Professor of Chemistry in the University of Greifswald. Translated for the use of Students by A. T. CAMERON, M.A., B.Sc., of the University of Toronto. Price _6s._ net. Fully Illustrated. CONTENTS:--Chapter I.--Introductory. Chapter II.--The Determination of Density. Chapter III.--Determination of Molecular Weights in Solutions. Chapter IV.--Thermo-Chemistry. Chapter V.--The Determination of Optical Constants. Chapter VI.--The Thermostat. Chapter VII.--Chemical Statics and Dynamics. ELECTRO-CHEMISTRY: Chapter VIII.--Foundations. Chapter IX.--Electrical Conductivity. Chapter X.--Faraday's Law. Transport Numbers. Chapter XI.--Measurement of Differences of Potential. Chapter XII.--Electro-statics. Appendix. Index. SMALL TABLES IN THE TEXT: Molecular elevation of the boiling point and depression of the freezing point. Heat of combustion per gram at constant volume. Spectrum lines for optical measurements. Atomic refraction. Conductivities of some standard solutions. Dielectric constants. INTRODUCTION TO THE CHEMISTRY AND PHYSICS OF BUILDING MATERIALS. By ALAN E. MUNBY, M.A. (Cantab). The elementary principles of science which underlie the study of Building Materials in practice. Demy 8vo. 6_s._ net. TECHNICAL THERMODYNAMICS. By Dr. GUSTAV ZEUNER. First English Edition. From the fifth complete and revised edition of "Grundzüge der Mechanischen Wärmetheorie." Vol. I.--Fundamental Laws of Thermodynamics; Theory of Gases. Vol. II.--The Theory of Vapours. Authorised Translation by J. F. KLEIN, D.E., Professor of Mechanical Engineering, Lehigh University. Illustrated. Two Volumes. Demy 8vo. Price 36_s._ net. EXPERIMENTAL AND THEORETICAL APPLICATIONS OF THERMODYNAMICS TO CHEMISTRY. By PROFESSOR WALTER NERNST, University of Berlin. Extra Crown 8vo. 5_s._ net. ENTROPY: OR, THERMODYNAMICS FROM AN ENGINEER'S STANDPOINT, AND THE REVERSIBILITY OF THERMODYNAMICS. By JAMES SWINBURNE, M.Inst.C.E., M.I.E.E., etc. Illustrated with Diagrams. 4_s._ 6_d._ net. ELECTRICAL ENGINEERING ELECTRICITY. By H. M. HOBART, B.Sc., M.Inst. C.E., etc. A Text-Book designed in particular for Engineering Students. 208 pages + xix. 43 Tables and 115 Illustrations. Demy 8vo. 6_s._ net. CONTENTS:--The "Generation" and Conduction of Electricity. Copper, Aluminium, and other Conducting Materials. Energy. The Kelvin. Electricity. Continuous Electricity and Ohm's Law. The Magnetic Field. Conductors Moving in a Magnetic Field. Alternating Electricity. Inductance. The Magnetic Circuit. Insulating Materials.