LECTURES ON SOME RECENT ADVANCES IN PHYSICAL SCIENCE. By the same. 34 Edition. Crown 8vo. 08.

TAYLOR.-SOUND AND MUSIC. An Elementary Treatise on the Physical Con. stitution of Musical Sounds and Harmony, including the Chief Acoustical Discoveries of Professor Helmholtz. By SEDley Taylor, M. A. Illustrated. 2d Ed. Ex. cr. 8vo. 8s. Gdl. "THOMPSON. — ELEMENTARY LESSONS IN ELECTRICITY AND MAGNET. ISM. BY SILVANUS P. THOMPSON, Principal and Professor of Physics in the Technical College, Finsbury. Illustrated. New Ed., revised. Fcap. 8vo. 4s. 6d. THOMSON.-Works by J. J. THOMSON, Professor of Experimental Physics in the University of Cambridge.

A TREATISE ON THE MOTION OF VORTEX RINGS. Adams Prize Essay. 1882. 8vo. 68.

APPLICATIONS OF DYNAMICS TO PHYSICS AND CHEMISTRY. Cr. 8vo. 78. Gd.

THOMSON.-Works by Sir W. THOMSON, P.R.S., Professor of Natural Philosophy in the University of Glasgow.

ELECTROSTATICS AND MAGNETISM, REPRINTS OF PAPERS ON. 21 Ed. 8vo. 18s.

POPULAR LECTURES AND ADDRESSES. 3 Vols.

Illustrated. Cr. 8vo. Vol. I. CONSTtitution of MATTER. 78. 6d. Vol. III. NAVIGATION. 78. Gd. TODHUNTER.-Works by ISAAC TODHUNTER, F.R.S.

AN ELEMENTARY TREATISE ON LAPLACE'S, LAME'S, and besseL'S FUNCTIONS. Crown 8vo. 10s. 6d.

A HISTORY OF THE MATHEMATICAL THEORIES OF ATTRACTION, AND THE FIGURE OF THE EARTH, from the time of Newton to that of Laplace. 2 vols. 8vo. 24s.

TURNER.-A COLLECTION OF EXAMPLES ON HEAT AND ELECTRICITY. By II. H. TURNER, Fellow of Trinity College, Cambridge. Cr. 8vo. 2s. 6d. WRIGHT.-LIGHT: A Course of Experimental Optics, chiefly with the Lantern. By LEWIS WRIGHT. Illustrated. Cr. 8vo. 78. Gd.

ASTRONOMY.

AIRY.-Works by Sir G. B. AIRY, K.C.B., formerly Astronomer-Royal. *POPULAR ASTRONOMY. 7th Ed. Revised by H. H. TURNER, M.A. 18mo. 48. 6d.

GRAVITATION: An Elementary Explanation of the Principal Perturbations in the Solar System. 2d Ed. Cr. 8vo. 78. Gd.

CHEYNE.-AN ELEMENTARY TREATISE ON THE PLANETARY THEORY. By C. H. H. CHEYNE. With Problems. 3d Ed. Edited by Rov. A. FREEMAN, M.A., F.R.A.8. Cr. 8vo. 78. 6d.

CLARK and SADLER.-THE STAR GUIDE. By L. CLARK and II. SADLER, Roy. 8vo. 5s.

OROSSLEY, GLEDHILL, and WILSON.-A HANDBOOK OF DOUBLE STARS. By E. CROSSLey, J. GledhiLL, and J. M. WILSON. 8vo. 21s. CORRECTIONS TO THE HANDBOOK OF DOUBLE STARS. 8vo. 1s. FORBES.-TRANSIT OF VENUS. By G. FORBES, Professor of Natural Philosophy in the Andersonian University, Glasgow. Illustrated. Cr. 8vo. 3s. 6d. GODFRAY.-Works by Hvon GODFRAY, M.A., Mathematical Lecturer at Pembroke College, Cambridge.

A TREATISE ON ASTRONOMY. 4th Ed. 8vo. 12s. 6d.

AN ELEMENTARY TREATISE ON THE LUNAR THEORY, with a brief Sketch of the Problem up to the time of Newton. 2d Ed., revised. Cr. 8vo. 68. 6d. LOCKYER.-Works by J. NORMAN LOCKYER, F.R.S.

*PRIMER OF ASTRONOMY. Illustrated. 18mo. 18.

ELEMENTARY LESSONS IN ASTRONOMY. With Spectra of the Sun, Stars, and Nebula, and numerous Illustrations. 36th Thousand. Revised through out Fcap. 8vo. 5s. 6d.

QUESTIONS ON LOCKYER'S ELEMENTARY LESSONS IN ASTRONOMY. By J. FORBES ROBERTSON, 18mo. 18. d.

THE CHEMISTRY OF THE SUN. Illustrated. 8vo. 14s.

THE METEORITIC HYPOTHESIS OF THE ORIGIN OF COSMICAL SYSTEMS. Illustrated. Svo. 178. net.

THE EVOLUTION OF THE HEAVENS AND THE EARTII. Cr. 8vo. Пlustrated. LOCKYER and SEABROKE.-STAR-GAZING PAST AND PRESENT. By J. [In the Press. NORMAN LOCKYER, F.R.S. Expanded from Shorthand Notes with the assistance of G. M. SEABROKE, F.R.A.S. Royal 8vo. 21s. NEWCOMB.-POPULAR ASTRONOMY. By S. NEWCOMB, LL.D., Professor U.S. Naval Observatory. Illustrated. 2d Ed., revised. 8vo. 188.

HISTORICAL.

BALL.-A SHORT ACCOUNT OF THE HISTORY OF MATHEMATICS. By W. W. R. BALL, M.A. Cr. 8vo. 10s. 6d.

NATURAL SCIENCES.

Chemistry; Physical Geography, Geology, and Mineralogy; Biology; Medicine.

(For MECHANICS, PHYSICS, and ASTRONOMY, seo MATHEMATICS.)

CHEMISTRY.

ARMSTRONG.-A MANUAL OF INORGANIC CHEMISTRY. BY HENRY ARM STRONO, F.R.S., Professor of Chemistry in the City and Guilds of London Tech. nical Institute. Cr. Svo. *COHEN. THE OWENS COLLEGE COURSE OF PRACTICAL ORGANIC (In preparation. CHEMISTRY. ByJULIUS B. COUEN, Ph.D., Assistant Lecturer on Chemistry in the Owens College, Manchester. With a Preface by Sir HENRY ROSCOE, F.R.S., and C. SCHORLEMMER, F.R.S. Feap. Svo. 2s. 6d. COOKE.-ELEMENTS OF CHEMICAL PHYSICS. By JOSIAH P. COOKE, Jun., Erving Professor of Chemistry and Mineralogy in Harvard University. 4th Ed. 8vo. 218. FLEISCHER.-A SYSTEM OF VOLUMETRIC ANALYSIS. BY EMIL FLEISCHER, Translated, with Notes and Additions, by M. M. P. MUIR, F.R.S.E. Illustrated. Cr. Svo. 78. Od. FRANKLAND.-A HANDBOOK OF AGRICULTURAL CHEMICAL ANALYSIS. By P. F. FRANKLAND, F.R.S., Professor of Chemistry in University College, Dundee. Cr. 8vo. 78. Gd. HARTLEY.—A COURSE OF QUANTITATIVE ANALYSIS FOR STUDENTS. By W. NOEL HARTLEY, F.R.S., Professor of Chemistry and of Applied Chemistry, Science and Art Department, Royal College of Science, Dublin. Gl. Svo. 58. HEMPEL.-METHODS OF GAS ANALYSIS. By Dr. WALTHER HEMPEL. Trans. lated by Dr. L. M. DENNIS. [In preparation. A Text Book for

HIORNS.-PRACTICAL METALLURGY AND ASSAYING.

the use of Teachers, Students, and Assayers. By ARTHUR H. HIORNS, Prin cipal of the School of Metallurgy, Birmingham and Midland Institute. Illus trated. Gl. 8vo. 68.

A TEXT-BOOK OF ELEMENTARY METALLURGY FOR THE USE OF STUDENTS. To which is added an Appendix of Examination Questions, embracing the whole of the Questions set in the three stages of the subject by the Science and Art Department for the past twenty years. By the same. Gl. 8vo. 4s.

IRON AND STEEL MANUFACTURE. A Text-Book for Beginners. By the same. Illustrated. Gl. 8vo. 38. 6d. MIXED METALS OR METALLIC ALLOYS. By the same. Gl. 8vo. 6s. JONES. THE OWENS COLLEGE JUNIOR COURSE OF PRACTICAL OHEM. ISTRY. BY FRANCIS JONES, F.R.S. E., Chemical Master at the Grammar School, Manchester. With Preface by Sir HENRY ROSCOE, F.R.S. Illustrated. Fcap. 8vo. 2s. 6d.

QUESTIONS ON CHEMISTRY. A Series of Problems and Exercises in Inorganic and Organic Chemistry. By the same. Feap. 8vo. 38. LANDAUER.-BLOWPIPE ANALYSIS. By J. LANDAUER. Authorised English Edition by J. TAYLOR and W. E. KAY, of Owens College, Manchester. [New Edition in the Press. LOCKYER. THE CHEMISTRY OF THE SUN. By J. NORMAN LOCKYER, F.R.8. Illustrated. 8vo. 148. LUPTON.-CHEMICAL ARITHMETIC. With 1200 Probleins. By S. LUPTON, M.A. 2d Ed., revised and abridged. Fcap. 8vo. 4s. 6d. MANSFIELD.-A THEORY OF SALTS. By C. B. MANSFIELD. Crown 8vo. 148. MELDOLA-THE CHEMISTRY OF PHOTOGRAPHY. By RAPHAEL Meldola, F.R.S., Professor of Chemistry in the Technical College, Finsbury. Cr. 8vo. GR. MEYER.-HISTORY OF CHEMISTRY FROM THE EARLIEST TIMES TO THE PRESENT DAY. BY ERNST VON MEYER, Ph.D. Translated by GEORGE McGowan, Ph.D. 8vo. 148. net.

MIXTER.-AN ELEMENTARY TEXT-BOOK OF CHEMISTRY. BY WILLIAM G. MIXTER, Professor of Chemistry in the Sheffield Scientific School of Yale College. 2d and revised Ed. Cr. 8vo. 7s. 6d. MUIR.-PRACTICAL CHEMISTRY FOR MEDICAL STUDENTS. Specially arranged for the first M.B. Course. By M. M. P. MUIR, F.R.S. E., Fellow and Pre lector in Chemistry at Gonville and Caius College, Cambridge. Fcap. 8vo. 18. 6d. MUIR and WILSON.-THE ELEMENTS OF THERMAL CHEMISTRY. By M. M. P. MUIR, F.R.S.E.; assisted by D. M. WILSON. 8vo. 12s. 6d. OSTWALD.-OUTLINES OF GENERAL CHEMISTRY (PHYSICAL AND THEORETICAL). By Prof. W. OSTWALD. Translated by JAMES Walker, D.Sc., Ph.D. 8vo. 108. net.

RAMSAY.-EXPERIMENTAL PROOFS OF CHEMICAL THEORY FOR BEGINNERS. BY WILLIAM RAMSAY, F.R.8., Professor of Chemistry in University College, London. Pott 8vo. 2s. 6d.

BEMSEN.-Works by IRA REMSEN, Professor of Chemistry in the Johns Hopkins University, U.S.A.

COMPOUNDS OF CARBON: or, Organic Chemistry, an Introduction to the Study of. Cr. 8vo. 6s. 6d.

AN INTRODUCTION TO THE STUDY OF CHEMISTRY (INORGANIC CHEMISTRY). Cr. 8vo. 68. 6d.

"THE ELEMENTS OF CHEMISTRY. A Text-Book for Beginners. Fcap. 8vo. 2s. 6d.

A TEXT-BOOK OF INORGANIC CHEMISTRY. 8vo. 16s. ROSCOE.-Works by Sir HENRY E. ROSCOE, F.R.S., formerly Professor of Chemistry in the Owens College, Victoria University, Manchester. "PRIMER OF CHEMISTRY. Illustrated. With Questions. 18mo. 18. LESSONS IN ELEMENTARY CHEMISTRY, INORGANIC AND ORGANIC. With Illustrations and Chromolitho of the Solar Spectrum, and of the Alkalics and Alkaline Earths. Fcap. 8vo. 4s. 6d.

ROSCOE and SCHORLEMMER.-INORGANIC AND ORGANIC CHEMISTRY.
A Complete Treatise on Inorganic and Organic Chemistry. By Sir HENRY E.
Roscor, F.R.S., and Prof. C. SCHORLEMMER, F.R.S. Illustrated.
8vo.
Vols. I. and II. INORGANIC CHEMISTRY. Vol. I.-The Non-Metallic Ele-
ments. 2d Ed. 218. Vol. II. Part I.-Metals. 18s. Part II.-Metals. 18s.
Vol. III.-ORGANIC CHEMISTRY. THE CHEMISTRY OF THE HYDRO-
CARBONS and their Derivatives. Five Parts. Parts I., II. and IV
Parts III. and V. 188. each.

218.

ROSCOE and SCHUSTER.-SPECTRUM ANALYSIS. Lectures delivered in 1868. By Sir HENRY ROSCOE, F.R.8. 4th Ed., revised and considerably en larged by the Author and by A. SCHUSTER, F.R.S., Ph.D., Professor of Applied Mathematics in the Owens College, Victoria University. With Appendices, Illustrations, and Plates. Svo. 21s. *THORPE.-A SERIES OF CHEMICAL PROBLEMS. With Key. For use in Colleges and Schools. By T. E. THORPE, B.Sc. (Vic.), Ph.D., F.R.S. Revised and Enlarged by W. TATE, Assoc.N.S.S. With Preface by Sir II. E. ROSCOE, F.R.S. New Ed. Fcap. 8vo. 2s.

THORPE and RÜCKER.-A TREATISE ON CHEMICAL PHYSICS. By Prof. T. E. THORPE, F.R.S., and Prof. A. W. RUCKER, F.R.S. Illustrated. Svo. [In preparation. WURTZ.-A HISTORY OF CHEMICAL THEORY. By AD. WURTZ. Translated by HENRY WATTS, F.R.S. Crown 8vo. s.

PHYSICAL GEOGRAPHY, GEOLOGY, AND
MINERALOGY.

BLANFORD.-THE RUDIMENTS OF PHYSICAL GEOGRAPHY FOR THE
USE OF INDIAN SCHOOLS; with a Glossary of Technical Terms employed.
By II. F. BLANFORD, F.G.S. Illustrated. Cr. 8vo. 28. 04.
FERREL.-A POPULAR TREATISE ON THE WINDS. Comprising the General
Motions of the Atmosphere, Monsoons, Cyclones, Tornadoes, Waterspouts,
Hailstorms, etc. By WILLIAM FERREL, M.A., Member of the American National
Academy of Sciences. 8vo. 18s.

FISHER-PHYSICS OF THE EARTH'S CRUST. By the Rev. OSMOND FISHER, M.A., F.G.S., Hon. Fellow of King's College, London. 2d Ed., altered and en. larged. Svo. 12s.

GEIKIE.-Works by Sir ARCHIBALD GEIKIE, F.R.S., Director-General of the Geological Survey of the United Kingdom."

*PRIMER OF PHYSICAL GEOGRAPHY. Illustrated. With Questions. 18mo. 18. *ELEMENTARY LESSONS IN PHYSICAL GEOGRAPHY. Illustrated. Fcap. 8vo. 48. 6d. *QUESTIONS ON THE SAME. 18. 6d. *PRIMER OF GEOLOGY. Illustrated. 18mo. 18.

*CLASS-BOOK OF GEOLOGY. Illustrated. New and Cheaper Ed. Cr. 8vo. 48. 6d.

TEXT-BOOK OF GEOLOGY. Illustrated. 2d Ed., 7th Thousand, revised and enlarged. 8vo. 288.

OUTLINES OF FIELD GEOLOGY. Illustrated. New Ed., revised and enlarged. Gl. 8vo. 38. 6d.

THE SCENERY AND GEOLOGY OF SCOTLAND, VIEWED IN CONNEXION.
WITH ITS PHYSICAL GEOLOGY. Illustrated. Cr. 8vo. 12s. 6d.
HUXLEY.-PHYSIOGRAPHY. An Introduction to the Study of Nature. By
T. H. HUXLEY, F.R.S. Illustrated. New and Cheaper Edition. Cr. 8vo. 6s.
LOCKYER.-OUTLINES OF PHYSIOGRAPHY-THE MOVEMENTS OF THE
EARTH. By J. NORMAN LOCKYER, F.R.S., Examiner in Physiography for the
Science and Art Department. Illustrated. Cr. 8vo. Sewed, 18. Gd.
MIERS. A TREATISE ON MINERALOGY. By H. A. MIERS, of the British
Muscum. 8vo.
[In preparation.
PHILLIPS. A TREATISE ON ORE DEPOSITS. By J. ARTHUR PHILLIPS, F.R.S.
Illustrated. 8vo. 25s.

ROSENBUSCH and IDDINGS.-MICROSCOPICAL PHYSIOGRAPHY OF THE
ROCK-MAKING MINERALS: AN AID TO THE MICROSCOPICAL STUDY
OF ROCKS. By H. ROSENBUSCH. Translated and Abridged by J. P. IDDINGS
Illustrated. 8vo. 24s.
WILLIAMS.- ELEMENTS OF CRYSTALLOGRAPHY FOR STUDENTS OF
CHEMISTRY, PHYSICS, AND MINERALOGY. By G. H. WILLIAMS, Ph.D.
Cr. 8vo. 68.

ALLEN.-ON THE COLOURS OF FLOWERS, as Illustrated in the British Flora.
By GRANT ALLEN. Illustrated. Cr. 8vo. 8s. 6d.
BALFOUR.-A TREATISE ON COMPARATIVE EMBRYOLOGY. By F. M.
BALFOUR, F.R.S., Fellow and Lecturer of Trinity College, Cambridge. Illus
trated. 2d Ed., reprinted without alteration from the 1st Ed. 2 vols. 8vo.
Vol. I. 188. Vol. II. 218.

BALFOUR and WARD.-A GENERAL TEXT-BOOK OF BOTANY. By ISAAC
BAYLEY BALFOUR, F.R.S., Professor of Botany in the University of Edinburgh,
and H. MARSHALL WARD, F.R.S., Professor of Botany in the Royal Indian
Engineering College, Cooper's Hill. 8vo.
[In preparation.
BATESON.-MATERIALS FOR THE STUDY OF VARIATION IN ANIMALS.
Part I. Discontinuous Variation. By W. BATESON, M.A., Balfour Student
and Fellow of St. John's College, Cambridge. 8vo. Illustrated. [In the Press.
*BETTANY.-FIRST LESSONS IN PRACTICAL BOTANY. By G. T. BETTANY.
1Sino. 18.

*BOWER.-A COURSE OF PRACTICAL INSTRUCTION IN BOTANY. By F.
O. BOWER, D.Sc., F.R.S., Regius Professor of Botany in the University of
Glasgow. New Ed., revised. Cr. 8vo. 10s. 6d. Abridged Ed. [In preparation.
BUCKTON.-MONOGRAPH OF THE BRITISH CICADE, OR TETTIGIDE. By
G. B. BUCKTON. In 8 parts, Quarterly. Part I. January, 1890. 8vo. Parts
I.-VI. ready. 8s. each, net. Vol. I. 338. 6d. net.

CHURCH and SCOTT.-MANUAL OF VEGETABLE PHYSIOLOGY. By
Professor A. II. CHURCH, and D. H. SCOTT, D.Sc., Lecturer in the Normal
[In preparation.
School of Science. Illustrated. Cr. Svo.
COPE.-THE ORIGIN OF THE FITTEST. Essays on Evolution. By E. D.
COPE, M.A., Ph.D. 8vo. 12s. 6d.
COUES.-HANDBOOK OF FIELD AND GENERAL ORNITHOLOGY. By
Prof. ELLIOTT COUES, M.A. Illustrated. 8vo. 10s. net.
DARWIN.-MEMORIAL NOTICES OF CHARLES DARWIN, F.R.S., etc. By
T. H. HUXLEY, F.R.S., G. J. ROMANES, F.R.S., ARCHIBALD GEIKIE, F.R.S.,
With a Por
and W. THISELTON DYER, F.R.S. Reprinted from Nature.
trait. Cr. 8vo. 2s. 6d.
EIMER.-ORGANIC EVOLUTION AS THE RESULT OF THE INHERITANCE
OF ACQUIRED CHARACTERS ACCORDING TO THE LAWS OF OR
GANIC GROWTH. By Dr. G. H. THEODOR EIMER. Translated by J. T.
CUNNINGHAM, F.R.S. E., late Fellow of University College, Oxford. 8vo. 12s. 6‹.
FEARNLEY.-A MANUAL OF ELEMENTARY PRACTICAL HISTOLOGY.
By WILLIAM FEARNLEY. Illustrated. Cr. 8vo. 78. Gu.

FLOWER and GADOW.-AN INTRODUCTION TO THE OSTEOLOGY OF
THE MAMMALIA. By W. H. FLOWER, F.R.S., Director of the Natural His
tory Departments of the British Muscum. Illustrated. 3d Ed. Revised with
the assistanco of HANS GADOW, Ph.D., Lecturer on the Advanced Morphology
of Vertebrates in the University of Cambridge. Cr. 8vo. 108. Gd.
FOSTER.-Works by MICHAEL FOSTER, M.D., F.R.S., Professor of Physiology in
the University of Cambridge.

*PRIMER OF PHYSIOLOGY. Illustrated. 18mo. 18.

A TEXT-BOOK OF PHYSIOLOGY. Illustrated. 5th Ed., largely revised. 8vo. Part L., comprising Book I. Blood-The Tissues of Movement, The Vascular Mechanism. 10s. 6d. Part II., comprising Book II. The Tissues of Chemical Action, with their Respective Mechanisms-Nutrition. 108. 6d. Part III. The Central Nervous System. 78. 6d. Part IV., comprising the remainder of Book III. The Senses and Some Special Muscular Mechanisms; and Book IV. The Tissues and Mechanisms of Reproduction. FOSTER and BALFOUR. -THE ELEMENTS OF EMBRYOLOGY. By Prof. MICHAEL FOSTER, M.D., F.R.S., and the late F. M. BALFOUR, F.R.S., Professor of Animal Morphology in the University of Cambridge. 2d Ed., revised. Edited by A. SEDGWICK, M.A., Fellow and Assistant Lecturer of Trinity College,

Cambridge, and W. HEAPE, M.A., late Demonstrator in the Morphological Laboratory of the University of Cambridge. Illustrated. Cr. 8vo. 10s. d. FOSTER and LANGLEY.-A COURSE OF ELEMENTARY PRACTICAL PHYSIOLOGY AND HISTOLOGY. By Prof. MICHAEL FOSTER, M.D., F.R.S., and J. N. LANGLEY, F.R.S., Fellow of Trinity College, Cambridge. 6th Ed. Cr. Svo. 78. Gd. GAMGEE.-A TEXT-BOOK OF THE PHYSIOLOGICAL CHEMISTRY OF THE ANIMAL BODY. Including an Account of the Chemical Changes occurring in Discase. By A. GAMGEE, M.D., F.R.S. Illustrated. 8vo. Vol. I. 188. GOODALE.-PHYSIOLOGICAL BOTANY. I. Outlines of the Histology of Phænogamous Plants. II. Vegetablo Physiology. By GEORGE LINCOLN GOODALE, M.A., M. D., Professor of Botany in Harvard University. 8vo. 10s. 6d. GRAY.-STRUCTURAL BOTANY, OR ORGANOGRAPHY ON THE BASIS OF MORPHOLOGY. To which are added the Principles of Taxonomy and Phytography, and a Glossary of Botanical Terins. By Prof. ASA GRAY, LL.D. 8vo. 10s. 6d.

GENT.

Sd Ed., revised.

THE SCIENTIFIC PAPERS OF ASA GRAY. Selected by C. SPRAGUE SAR2 vols. Vol. I. Reviews of Works on Botany and Related Subjects, 1834-1887. Vol. II. Essays, Biographical Sketches, 1841-1886. 8vo. 21s. HAMILTON.-A SYSTEMATIC AND PRACTICAL TEXT-BOOK OF PATIOLOGY. By D. J. HAMILTON, F.R.S.E., Professor of Pathological Anatomy in the University of Aberdeen. Illustrated. 8vo. Vol. I. 25s. HARTIG.-TEXT-BOOK OF THE DISEASES OF TREES. By Dr. ROBERT HARTIG. Translated by WM. SOMERVILLE, B.Sc., D.E., Professor of Agriculture and Forestry, Durham College of Science, Newcastle-on-Tyne. Edited, with Introduction, by Prof. II. MARSHALL WARD. 8vo. [In preparation. HOOKER.-Works by Sir JosEPH HOOKER, F.R.S., &c. *PRIMER OF BOTANY. Illustrated. 18mo. 18. THE STUDENT'S FLORA OF THE BRITISH ISLANDS. Gl. 8vo. 10s. 6d. HOWES.-AN ATLAS OF PRACTICAL ELEMENTARY BIOLOGY. By G. B. HowES, Assistant Professor of Zoology, Normal School of Science and Royal School of Mines. With a Preface by Prof. T. H. HUXLEY, F.R.S. 4to. 14s. HUXLEY.-Works by Prof. T. H. HUXLEY, F.R.S. *INTRODUCTORY PRIMER OF SCIENCE. 18mo. 18. *LESSONS IN ELEMENTARY PHYSIOLOGY. Illustrated. Feap. 8vo. 4s. Od. QUESTIONS ON HUXLEY'S PHYSIOLOGY. By T. ALCOCK, M.D. 18mo. Is. Gd. HUXLEY and MARTIN.-A COURSE OF PRACTICAL INSTRUCTION IN ELEMENTARY BIOLOGY. By Prof. T. II. HUXLEY, F.R.S., assisted by II. N. MARTIN, F.R.S., Professor of Biology in the Johns Hopkins University, U.S.A. New Ed., revised and extended by G. B. Howes and D. H. SCOTT, Ph.D., Assistant Professors, Normal School of Science and Royal School of Mines. With a Preface by T. II. HUXLEY, F.R.S. Cr. 8vo. 108. Gd. KLEIN.-Works by E. KLEIN, F.R.S., Lecturer on General Anatomy and Physiology in the Medical School of St. Bartholomew's Hospital, Professor of Bacteriology at the College of State Medicine, London.

MICRO-ORGANISMS AND disease. An Introduction into the Study of Specific Micro-Organisms. Illustrated. 3d Ed., revised. Cr. 8vo. 68. THE BACTERIA IN ASIATIC CHOLERA. Cr. 8vo. 58. LANG.-TEXT-BOOK OF COMPARATIVE ANATOMY. By Dr. ARNOLD LANG. Professor of Zoology in the University of Zurich. Translated by H. M. BERNARD, M.A., and M. BERNARD. Introduction by Prof. E. HAECKEL. 2 vols. Illus trated. Svo. Part I. 17s. net. [Part II. in the Press. LANKESTER.-Works by E. RAY LANKESTER, F.R.S., Linacre Professor of Human and Comparative Anatomy in the University of Oxford. A TEXT-BOOK OF ZOOLOGY. 8vo.

[In preparation.

THE ADVANCEMENT OF SCIENCE. Occasional Essays and Addresses. 8vo. 10s. 6d.