WILLIAM WESLEY AND SON,

Scientific Booksellers and Publishers,

28 ESSEX STREET, STRAND, LONDON.

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The following recently-published

NATURAL HISTORY AND SCIENTIFIC BOOK CIRCULARS

include a portion of their stock :

No. 7-ICHTHYOLOGY; Reptilia and Amphibia; General Zoology
including Ancient Works, Biographies. Classification, Darwinism
Manuals, Periodicals, Transactions of Societies; Anatomy, Physiology
and Embryology. Price 4d

No. 9-ORNITHOLOGY; Local and British Ornithological Faunas;
Foreign and Exotic Ornithological Faunas; Cage Birds and Poultry;
Ornithological Monographs: Periodicals and Systematic Works.
MAMMALIA; including Cetacea, Sirenia, and Pinnipedia.
FAUNAS AND GEOGRAPHY of Great Britain and Ireland,
Continental Europe, Africa. America, Arctic Regions, Asia, Austral-
ZOOLOGICAL VOYAGES. Over 1000 Works. Price 4d.

W. WESLEY & SON, 28 Essex Street, Strand, London.

is Published, Parts 1 and 2, with 6 Coloured Plates, 4to, 5s. each, Post free.

BIRDS.

NORTH AMERICAN
By H.
NEHRLING. To be completed in 12 Parts, containing 36 Coloured
Plates after Water-colour Drawings by Prof. ROBERT RIDGWAY, of the
United States National Museum, A. GOERING, and GUSTAV MUETZEL.
W WESLEY & SON, 28 Essex Street, Strand, London.

THIRD EDITION, MUCH ENLARGED.

This Day, Crown 8vo, 400 Pages, with 145 Illustrations, 7s. 6d., Cloth
(Post free).

ELECTRIC LIGHT: ITS PRODUCTION
AND USE. Embodying plain directions for the treatment of dynamo-
electric machines, batteries, accumulators, and electric lamps. By
JOHN W. URQUHART, Electrician, Author of Electro-plating,"
Electro-typing," &c. Third Edition, Carefully Revised, with Large
Acdit.uns.

Indo: CROSBY LOCKWOOD & SON, 7 Stationers' Hall Court, E. C.

DENT'S
WATCHES.

NEWTON & CO.,

SCIENTIFIC INSTRUMENT

MAKERS

TO HER MAJESTY THE
QUEEN

AND THE GOVERNMENT.

NEW ILLUSTRATED

CATALOGUE OF

SCIENTIFIC APPARATUS,

144 pages, 6d.

WIMSHURST ELECTRICAL MACHINE.

Best Quality, giving full 4-inch Spark in Air, £5. As made for the
Science and Art Department.

NEWTON & CO.

3 FLEET STREET, TEMPLE BAR, LONDON, E.C.

OIL ENGINE

(PRIESTMAN'S, HUME'S, & ETEVE'S PATENTS).

NO COAL. NO CAS. NO BOILER. NO SMOKE. USES COMMON MINERAL OILS ONLY.

NO EXTRA INSURANCE CHARGED. Royal Agricultural Society's Silver Medal at Nottingham, 1888, and at Windsor, 1889.

KING, MENDHAM, & Co., SUITABLE FOR ANY DRIVING PURPOSES.

Electrical Engineers

AND

Danufacturing Electricians. SPECIALTIES.-K. M. B. Patent Pocket Galvanometer. Price, Post free, 125. 9d.; Case, 1s. 6d. extra. Testing Instruments, Primary Batteries, Wimshurst Machines of Improved Pattern. Western Electrical Works,

BRISTOL.

NEW ILLUSTRATED CATALOGUE,
Post free, 4d.

Specially compiled List of Electrical
Publications, post free, 2d.

TUDSBURY & SONS'

NEW HIGH-TENSION EBONITE
"CYLINDER" WIMSHURST

ELECTRIC MACHINE.

Four cylinders, immense power. Simplest, best, and cheapest Machine yet invented. Further Improvements this Season. Dr. BREWER, the wellknown author, says of our Machines:-"Far more perfect than any hitherto invented." CYLINDER MACHINE, GIVING 6-INCH SPARK, £3 7s. New Illustrated Catalogue, One Stamp. EDWINSTOWE, NEWARK.

INVENTIONS EXHIBITION-GOLD MEDAL AWARDED. NEW ILLUSTRATED CATALOGUE of HIGH-CLASS WATCHES and CLOCKS at REDUCED PRICES, sent post free on application to E. DENT and Co., Makers to the Queen, 61 STRAND, LONDON, W.C., or 4 ROYAL EXCHANGE.

TRADE

MARK

DENT

Fullest Particulars on application to

PRIESTMAN BROS., LTD.,

Works: Hull. London Office: 73a Queen Victoria Street, E.C.

JOHN J. CRIFFIN & SONS, LIMITED,

MANUFACTURERS OF

CHEMICAL & PHILOSOPHICAL APPARATUS.

NOW READY,

Illustrated Classified and Descriptive

CATALOGUE of CHEMICAL APPARATUS.

Royal 8vo, 113 pp., Illustrated with nearly 600 Woodcuts,
6d., Post free.

22 GARRICK STREET, COVENT GARDEN,
LONDON, W.C.

STANLEY

Mathematical Instrument Manufacturer to H. M. Government, Council of
India, Science and Art Department, Admiralty, &c.

Mathematical, Drawing, and Surveying Instruments
of every Description,

Of the Highest Quality and Finish, at the most Moderate Prices.

Illustrated Price List Post Free.

W. F. S. obtained the only Medal in the Great Exhibition of 1862 for Excellence of Construction of Mathematical Instruments, and the only GOLD MEDAL in the International Inventions Exhibition 1885 for Mathematical Work. Silver Medal, Architects' Exhibition, 1886.

Address:-GREAT TURNSTILE, HOLBORN, LONDON, W.C.

Excellent Copies of the actual, natural Handwriting, also of Drawings, Music, even of elaborate Sketches, Programmes, Pians (up to Double-Elephant size), Shorthand, and Type-Writing, are easily, quickly, and cheaply produced by the

AUTOCOPYIST

Very fluid ink, used with ordinary pen and paper. Auto-Circulars
resemble written letters. Used at the House of Lords, &c.
AUTOCOPYIST DEPT. (A.E.T.Co., Ld.),
London Wall, London, and 52 Princess Street, Manchester.

F. H. BUTLER, M.A. Oxon., A.R.S. Mines, &c.,

NATURAL HISTORY AGENCY,

148 BROMPTON ROAD, LONDON, S.W.,
Near the British Natural History Museum.

English and Foreign Rocks, Minerals, Fossils, Shells, and other
Objects of Natural History.

A large series of interesting rocks now in stock from remote localities: the Highlands, including "Haggis" rock, Canisp Porphyry, and Archa Pikrite and Peridotite; also numerous micro-sections of little-known nor from Cornwall and elsewhere, well crystallized Pajsbergite, Brandute, Va jevite, and Braunite; exceptionally fine polished Bloodstone, CinnaT from the Avala Mine, Servia; Lancashire ferruginous calcite (the large tr yet raised), and Brazilian Rock-crystals. Among the recent acquisi fossils are specimens from the Caradoc of the Onny River, and rare Devot corals.

MINERALOGY.

SAMUEL HENSON,

97 REGENT STREET, LONDON, W. ESTABLISHED 1840. Late 277 STRAND.

VERY FINE CRYSTALLIZED GOLD NUGGETS FROM JOHANNESBURG, WEIGHING I TO 15 OZS., ALSO THE NEW MINERALS EUDIDYMITE, KOKKULITE, BERYLLONITE, SPERRYLITE, ARGYRODITE.

A Large Assortment of Beautiful Specimens, very suitable for Presents, from all Prices. Inspection invited.

COLLECTIONS FOR STUDENTS AND PROSPECTORS

Blowpipe Apparatus, &c., &c.
PRECIOUS STONES.

Lessons given.

Catalogue Free.

THE ZOOLOGIST:

A MONTHLY MAGAZINE OF NATURAL HISTORY. Third Series. Edited by J. E. HARTING, F.L.S., F.Z.S., member of the British Ornithologists' Union; contains

Original Articles by well-known naturalists in every branch of zoology: habits of animals; arrival and departure of migratory birds; occurrence of rare birds; distribution and migration of British fresh-water fish; new or rare marine fish; local aquaria; British reptiles; British land and fresh. water mollusca, with remarks on the haunts and habits of the species; and other matters of general interest to those who delight in natural history Reports of the Linnean, Zoological, and Entomological Societies. Review of natural history books. Occasional translations from foreign zoological journals of important and interesting articles in various branchesof zoology. There are occasional woodcuts.

SIMPKIN, MARSHALL, & CO., Stationers' Hall Court.

Waltham Bros, Brewers,London,S.W.

WIMSHURST

MACHINE.

Works in any Weather. Size giving 4 Sparks, £4 10s.

SCHOOL APPARATUS,

Approved by Science and Art Department.

HARVEY & PEAK, 6 CHARING CROSS ROAD, W.C.

MESSRS. MACMILLAN AND CO.'S NEW BOOKS.

LORD TENNYSON'S NEW BOOK.

DEMETER: AND OTHER POEMS.

By ALFRED LORD TENNYSON, D.C.L., Poet Laureate.
Fcap. 8vo, 6s.

NOW READY, New and Cheaper Edition, in 2 Vols., Extra Crown 8vo, 25s.

THE AMERICAN COMMONWEALTH.

By JAMES BRYCE, M.P., D.C.L.,

Regius Professor of Civil Law in the University of Oxford, Author of "The Holy Roman Empire."

PART I-The NATIONAL GOVERNMENT.

PART II.-The STATE GOVERNMENTS.
PART III-THE PARTY SYSTEM.

PART IV.-PUBLIC OPINION.

PART V.-ILLUSTRATIONS AND REFLECTIONS.
PART VI.—SOCIAL INSTITUTIONS.

THE LIBRARY REFERENCE ATLAS OF THE WORLD. A Complete Series of 84 Modern Maps. By JOHN BARTHOLOMEW, F.R.G.S. With Geographical Index to 100,000 places. ~ HalfMorocco, Gilt Edges. Folio, £2 12s. 6d. net.

This work has been designed with the object of supplying the public with a thoroughly complete and accurate atlas of Modern Geography, in a convenient reference form, and at a moderate price.

THE SCIENTIFIC PAPERS OF ASA GRAY. Selected by CHARLES SPRAGUE SARGENT. 2 Vols. Demy 8vo, 21s.

Vol. I.-Reviews of Works on Botany and Related Subjects, 1834-1887. Vol. II.-Essays: Biographical Sketches, 1841-1886. A NEW BOOK BY MR. ALFRED RUSSEL WALLACE. THIRD EDITION.

DARWINISM; an Exposition of the Theory of Natural Selection, with some of its Applications. By ALFRED RUSSEL WALLACE, LL.D., D.C.L., F.L. S., &c., Author of "The Malay Archipelago, The Geographical Distribution of Animals," "Island Life," &c. With Portrait and Map. Third Edition. Crown 8vo, 9s.

NOW READY, WITH ILLUSTRATIONS AND MAPS.

TRAVELS IN INDIA OF JEAN BAPTISTE TAVERNIER, BARON OF

AUBONNE. Translated from the original French Edition of 1676, with a Biographical Sketch of the Author, Notes, Appendices, &c., by V. BALL, LL.D., F.R.S., F.G. S., Director of the Science and Art Museum, Dublin, Author of "Jungle Life in India," "The Economic Geology of India," &c. With Illustrations and Maps. 2 Vols., Medium 8vo, £2.25.

OLD AGE. The Results of Information received respecting nearly Nine Hundred Persons who had attained the Age of Eighty Years, including Seventy-four Centenarians. By GEORGE MURRAY HUMPHRY, M.D., F.R. S., Professor of Surgery in the University of Cambridge. Crown 8vo, 4s. 6d.

SIXTH AND REVISED EDITION.

A TREATISE ON DYNAMICS OF A PARTICLE. With numerous Examples. By PETER GUTHRIE TAIT, M.A., Hon. Fellow of St. Peter's College, Cambridge, Professor of Natural Philosophy in the University of Edinburgh; and the late WILLIAM JOHN STEELE, B.A., Fellow of St. Peter's College, Cambridge. Sixth Edition, carefully revised. Crown 8vo, 12s.

SECOND EDITION, REVISED AND GREATLY ENLARGED. ABSOLUTE MEASUREMENTS IN ELECTRICITY AND MAGNETISM. By ANDREW GRAY, M. A., F.R.S. E., Professor of Physics in the University College of North Wales. Second Edition. Revised and Greatly Enlarged. Fcap. 8vo, 5s. 6d.

A POPULAR TREATISE ON THE WINDS. Comprising the General Motions of the Atmosphere, Monsoons, Cyclones, Tornadoes, Waterspouts, Hailstorms, &c. By WM. FERREL, M.A., Ph.D., late Professor and Assistant in the Signal Service, Member of the American National Academy of Sciences, and of other Home and Foreign Scientific Societies. Demy 8vo, 18s.

A TEXT-BOOK OF EUCLID'S ELEMENTS, including Alternative Proofs,

together with Additional Theorems and Exercises, Classified and Arranged. By H. S. HALL, M.A., and F. H.
STEVENS, M. A., Masters of the Military and Engineering Side, Clifton College. Globe Svo.
Books I.-VI. and XI.
Book XI. 15.

Book I. IS.

Books I and II. Is. 6d.

Books I.-IV. 3s.
Books III.-VI. 35.

45. 6d.

ARITHMETIC FOR BEGINNERS. By J. BROOKSMITH, M.A., LL.B., St. John's College, Cambridge; Barrister-at-Law; and sometime one of the Masters of Cheltenham College; and E. J. BROOKSMITH, B.A., LL.M., late Scholar and Law Student, St. John's College, Cambridge; Barrister-at-Law; Instructor of Mathematics at the Royal Military Academy, Woolwich. Globe 8vo, Is. 6d.

MIDDLE-CLASS COOKERY-BOOK. Compiled and Edited for the Manchester

School of Domestic Economy and Cookery. Pott 8vo, Is. 6d.

MACMILLAN AND CO., LONDON.

JUST PUBLISHED. NEW EDITION OF WATSON AND SONS'

CATALOGUE OF

MICROSCOPES, OBJECTIVES, & ACCESSORY APPARATUS.

It contains Instruments suitable for every class of investigation, many of quite new design, and all fitted with every modern improvement.

Everyone interested in Microscopy, and especially intending purchasers of Instruments, should see this new Catalogue.

FORWARDED POST FREE ON APPLICATION TO

W. WATSON & SONS, Opticians to Her Majesty's Government, 313 HIGH HOLBORN, LONDON, W.C., AND 251 SWANSTON ST., MELBOURNE, AUSTRALIA.

TO H.R.H. THE PRINCE OF WALES, THE EMPRESS OF GERMANY, &c.

PHYSICAL, PHYSIOLOGICAL, BOTANICAL, AND
SCIENTIFIC APPLIANCES GENERALLY,
Descriptions of which may be obtained on application.
Drawings made on Stone and Wood, and the most refined work in Lithography
and Color Printing, as well as the various processes connected with
Photography, done on the premises.

Sale Authorized Makers of PROF. EWING'S SEISMOMETRIC APPARATUS.
Quarts Fibres made as described by MR. C. V. Boys.

As for the Microscopes of CARL ZEISS, of Jena, and for the Earthquake
Model (made in Japan) of PROF. SEKIYA.

Now Ready, Vol. X. Complete.

Price to Subscribers 215. per Yearly Volume, post free.

THE JOURNAL OF PHYSIOLOGY.
Edited by MICHAEL FOSTER, M.D., F.R.S.
Published by the Proprietors and sold on their behalf at
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY'S WORKS,
ST. TIBB'S ROW, CAMBRIDGE.

132 HORSEFERRY ROAD, WESTMINSTER. TELEGRAPHIC ADDRESS: SECOHM, LONDON.

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NEGRETTI AND ZAMBRA'S OPERA, RACE, & FIELD GLASSES

OF EVERY DESCRIPTION.

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Illustrated Price Lists posted free to all parts of the World.

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HOLBORN VIADUCT, E.C.

Branches:-45 CORNHILL; 122 REGENT STREET.
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N. & Z.'s Large Illustrated Catalogue, 1200 Engravings, Price 5s. Ed.
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