Part III. [_In preparation._

_NEWTH._--Works by G. S. NEWTH, F.I.C, F.C.S., Demonstrator in the Royal College of Science, London.

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ELEMENTARY PRACTICAL CHEMISTRY. With 108 Ill.u.s.trations and 254 Experiments. Crown 8vo., 2_s._ 6_d._

_OSTWALD._--SOLUTIONS. By W. OSTWALD, Professor of Chemistry in the University of Leipzig. Being the Fourth Book, with some additions, of the Second Edition of Oswald's 'Lehrbuch der allgemeinen Chemie'.

Translated by M. M. PATTISON MUIR, Fellow and Praelector in Chemistry of Gonville and Caius College, Cambridge. 8vo., 10_s._ 6_d._

_PERKIN._--QUALITATIVE a.n.a.lYSIS (INORGANIC AND ORGANIC). By F. MOLLWO PERKIN, Ph.D.

_REYNOLDS._--EXPERIMENTAL CHEMISTRY FOR JUNIOR STUDENTS. By J. EMERSON REYNOLDS, M.D., F.R.S., Professor of Chemistry, University of Dublin.

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Part I. Introductory. Fcp. 8vo., 1_s._ 6_d._

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_SHENSTONE._--Works by W. A. SHENSTONE, F.R.S., Lecturer on Chemistry in Clifton College.

THE METHODS OF GLa.s.s-BLOWING. For the use of Physical and Chemical Students. With 42 Ill.u.s.trations. Crown 8vo., 1_s._ 6_d._

A PRACTICAL INTRODUCTION TO CHEMISTRY. Intended to give a Practical acquaintance with the Elementary Facts and Principles of Chemistry. With 25 Ill.u.s.trations. Crown 8vo., 2_s._

_THORNTON AND PEARSON._--NOTES ON VOLUMETRIC a.n.a.lYSIS. By ARTHUR THORNTON, M.A., and MARCHANT PEARSON, B.A., a.s.sistant Science Master, Bradford Grammar School. Medium 8vo., 2_s._

_THORPE._--Works by T. E. THORPE, C.B., B.Sc. (Vict.), Ph.D., F.R.S., Professor of Chemistry in the Royal College of Science, South Kensington. a.s.sisted by Eminent Contributors.

A DICTIONARY OF APPLIED CHEMISTRY. 3 vols. 8vo. Vols. I. and II., 42_s._ each. Vol. III., 63_s._

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PATTISON MUIR, M.A. With Plate of Spectra and 57 Woodcuts. Fcp. 8vo., 3_s._ 6_d._

_TILDEN._--Works by WILLIAM A. TILDEN, D.Sc. London, F.R.S., Professor of Chemistry in the Royal College of Science, South Kensington.

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_WATTS'_ DICTIONARY OF CHEMISTRY. Revised and entirely Rewritten by H.

FORSTER MORLEY, M.A., D.Sc., Fellow of, and lately a.s.sistant Professor of Chemistry in, University College, London; and M. M. PATTISON MUIR, M.A., F.R.S.E., Fellow, and Praelector in Chemistry, of Gonville and Caius College, Cambridge. a.s.sisted by Eminent Contributors. 4 vols.

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ORGANIC CHEMISTRY: the Fatty Compounds. With 45 Ill.u.s.trations.

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PHYSICS, ETC.

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ELEMENTARY TREATISE ON PHYSICS, Experimental and Applied.

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NATURAL PHILOSOPHY FOR GENERAL READERS AND YOUNG PERSONS.

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_GUTHRIE._--MOLECULAR PHYSICS AND SOUND. By F. GUTHRIE, Ph.D. With 91 Diagrams. Fcp. 8vo., 1_s._ 6_d._

_HELMHOLTZ._--POPULAR LECTURES ON SCIENTIFIC SUBJECTS. By HERMANN VON HELMHOLTZ. Translated by E. ATKINSON, Ph.D., F.C.S., formerly Professor of Experimental Science, Staff College. With 68 Ill.u.s.trations. 2 vols., crown 8vo., 3_s._ 6_d._ each.

CONTENTS.--Vol. I.--The Relation of Natural Science to Science in General--Goethe's Scientific Researches--The Physiological Causes of Harmony in Music--Ice and Glaciers--The Interaction of the Natural Forces--The Recent Progress of the Theory of Vision--The Conservation of Force--The Aim and Progress of Physical Science.

CONTENTS.--Vol. II.--Gustav Magnus. In Memoriam--The Origin and Significance of Geometrical Axioms--The Relation of Optics to Painting--The Origin of the Planetary System--Thought in Medicine--Academic Freedom in German Universities--Hermann Von Helmholtz--An Autobiographical Sketch.

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_MACLEAN._--EXERCISES IN NATURAL PHILOSOPHY. By MAGNUS MACLEAN, D.Sc., Professor of Electrical Engineering at the Glasgow and West of Scotland Technical College. Crown 8vo., 4_s._ 6_d._

_MEYER._--THE KINETIC THEORY OF GASES. Elementary Treatise, with Mathematical Appendices. By Dr. OSKAR EMIL MEYER, Professor of Physics at the University of Breslau. Second Revised Edition. Translated by ROBERT E. BAYNES, M.A., Student of Christ Church, Oxford, and Dr.