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IMPORTANT ANNOUNCEMENT.

D'Arsonval's Latest (1904) Apparatus,

DISPENSING WITH COILS & INTERRUPTERS.
For producing, perfectly regulating, and exactly measuring

X-RAYS & HIGH-FREQUENCY CURRENTS.

(Protected by Numerous Patents.)

SILENT IN WORKING.

SIMPLE IN MANIPULATION.

This apparatus has been already installed by many of the chief workers in Electro-Therapeutics in France and England. Descriptive Pamphlet gratis on application from the Sole Agents for Great Britain and its Colonies

THE MEDICAL SUPPLY ASSOCIATION, 228 GRAY'S INN ROAD,

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LONDON, W.C.,

LIGHTING

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LARGER

INSTALLATIONS

GIVE STILL

MORE REMARKABLE

RESULTS.

GAS PLANT. GAS ENGINE AND DYNAMO.

Electric Current for 100 16-c.p. lamps can be obtained for ONE PENNYWORTH of fuel per hour by using a CROSSLEY
GAS ENGINE and Dynamo combined, running on a CROSSLEY SUCTION GAS PLANT.
Full particulars and testimonials on reference to
BROS.. LTD., OPENSHAW

CROSSLEY

MANCHESTER.

WATSON'S MICROSCOPES & OBJECTS.

Watson's New "Club" Microscope. An Instrument of full size of most modern design. Especially arranged for the use of Amateurs. Monocular, £15; Binocular, £18.

Watson's well-known Van Heurck and Edinburgh Student's Micro-
scopes have been re-modelled in the Stage and Foot, and give even
greater convenience for working than before.

The Watson-Conrady Condenser System is of new computation, and
is expressly designed for Photo-Micrography.
New Aplanatic Magnifiers. New Objectives.

for the Microscopist.

Everything

For all the above see WATSON'S 158-page Catalogue of Microscopes, sent

New Slide of Radium for Microscope. Shows Scintillations
brilliantly, and easily managed-quite new

Trypanosoma Brucei (Sleeping Sickness)
Human Spinal Cord-prepared by Golgi's method
Beautiful Polyzoa-Cristatella mucedo, with Slatoblasts
Colenterata-Campanularia, Obelia, Clytia, and many others,

each

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s. d.

5 6

40

40

30

26

5/- to 21 0

Exquisite arranged groups composed of Diatoms, Spicules, &c., according to size, from Scales and Hairs of Insects arranged to represent Sprays, Bouquets, and Vases of Flowers, always interesting and attractive... 7/6, 15/-, 21/- and 42 0 Write for Catalogue No. 3 of Micro. Objects, together with newly published supplementary list of Slides, giving details of recently added specimens, post free. post free. SPINTHARISCOPE for observing the Scintillations of Radium. The very best. Price 21/SPECIALITIES: STRUTT'S RADIUM CLOCK. Price according to quantity and quality of Radium included. RADIUM of MAXIMUM activity in stock, also of medium and moderate activities. Send for particulars. W. WATSON & SONS, 313 HIGH HOLBORN, LONDON, W.C. BRANCH-16 Forrest Road, Edinburgh.

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J. H. DALLMEYER, Ltd., 25 Newman St., LONDON W.

Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, Jan. 19, 1905.

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"NATURE"

says:

"The new illustrated catalogue of physical appara tus just issued by Messrs. F. E. Becker and Co. (Messrs. W. and J. George, Ltd.) is likely to prove indispensable in the physical laboratories of all our schools and colleges. It runs to 628 large pages, and is strongly bound in cloth. Full particulars are provided, not only respecting the apparatus required in elementary and advanced physical teaching, but also concerning that necessary to the physicist in his research work. All branches of physics are included, and the instruments throughout are explained by excellent illustrations and concise descriptions, and, what is of prime importance, the figure and its appropriate text are close together."

66 KNOWLEDGE" says: "Messrs. F. E. Becker and Co. (W. and J. George, Ltd., Successors) have sent us a copy of their new list of apparatus in the various departments of Physics, including Sound, Light, Heat, Magnetism, Electricity, Mechanics, &c. This exhaustive catalogue consists of over 600 pages and some 4000 illustrations. One of its noteworthy features is that the requirements of science teaching in this country and its colonies are always kept in view, and the articles listed cover the latest developments in their subjects. The method adopted in the list itself, together with the completeness of the index, is such as to make reference to it simple and expeditious."

"SCHOOL WORLD" says: The science-master in every grade of school should possess a copy of the new catalogue of Messrs. George, for he will find here particulars as to the available apparatus in sound, light, heat, magnetism, electricity, mechanics, and other branches of physics, with information as to price and other necessary details. There is a profusion of well-drawn illustrations, which, together with the clearly expressed descriptions, will serve to explain to any buyer exactly what he is purchasing. This excellent catalogue will form a valuable addition to the reference library of any physical laboratory."

66

"CHEMICAL NEWS" says: 'Messrs. F. E. Becker and Co. (W. and J. George, Ltd., successors) have just issued a new Illustrated and Descriptive Catalogue of Physical Apparatus, &c., manufactured by them. This is the largest and best English catalogue of its kind printed, and comprises some 630 pages, and over 4000 illustrations; herein will be found all the newest up to date apparatus with all the latest improvements as manufactured at their works, while all obsolete apparatus has been omitted. The whole catalogue is arranged in a very clear manner under a number of principal headings, such as Magnetism, Heat, Sound, Light, Mechanics, Electricity, Pneumatics, Meteorology, X-ray Apparatus, &c., and a good index is provided; in fact, everything possible has been done to make this as perfect a guide as possible to users of apparatus in the subjects touched upon."

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NOW

READY.

With Illustrations, 2s. 6d. net, by post 2s. 9d.

X-RAYS:

TEXT-BOOKS OF PHYSICAL CHEMISTRY.

EDITED BY

SIR WILLIAM RAMSAY, K.C.B., F.R.S. "Collectively the manuals will form an adequate record of the present state of knowledge in a large and important field of chemistry. We heartily wish well to Sir William ance of the succeeling numbers of the series." -GLASGOW HERALD.

THEIR EMPLOYMENT in CANCER and Ramsay's venture, and look with interest for the appear

other DISEASES.

BY

RICHARD J. COWEN, L.R.C.S.I., L.R.C.P.I., &c.

London: H. J. GLAISHER, 57 Wigmore Street, W. NOW READY. With 815 Illustrations from Photomicrographs. Sup.-Roy. 8vo. Price 318. 6d.

STUDIES IN HETEROGENESIS.

By Dr. CHARLTON BASTIAN, F.R.S., Consulting Physician to University College Hospital, and the National Hospital for the Paralysed and Epileptic. WILLIAMS & NORGATE, 14 HENRIETTA STREET, W.C. LATEST PUBLICATIONS OF THE ZOOLOGICAL SOCIETY OF LONDON.

The " Zoological Record (Vol. 40), being

Records of Zoological Literature relating chiefly to the year 1903. Edited by DAVID SHARP, F.R.S. Price to Fellows, 255.; to the Public, 305.

The several sections of the volume are now issued separately, and can be obtained at the Society's Office, 3 Hanover Square, W., where communica. tions concerning this publication should be made only.

With 30 Original Illustrations. Price 2s. 6d.
The HYGIENE of the MOUTH.

A Guide to the Prevention and Control of Dental Diseases.
By R. DENISON PEDLEY, L.D.S. Eng., F.R.C.S. Ed.,
Dental Surgeon to the Evelina Hospital, Southwark.

BY THE SAME AUTHOR.

The DISEASES of CHILDREN'S TEETH. Well Illustrated. Price 7s. 6d.

SEGG & CO., 289 and 291 Regent Street, London, W.

THOMAS PRINCE,

SCIENTIFIC BOOKSELLER.

All books advertised and reviewed in NATURE are supplied at lowest cash prices.

Orders by post promptly dispatched.

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SCIENTIFIC AND

EDUCATIONAL BOOKS

NEW & SECOND HAND.
LARGEST STOCK in LONDON of SECOND-
HAND School, Classical, Mechanical, ELEMEN.

TARY and ADVANCED SCIENTIFIC BOOKS

at about HALF PUBLISHED PRICE.

Mathematical, Theological, and Foreign Books.

KEYS AND TRANSLATIONS.
J. POOLE & CO.
(ESTABLISHED 1854),

104 CHARING CROSS ROAD,

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THE PHASE RULE

AND ITS APPLICATIONS. By ALEX. FINDLAY, M.A., Ph.D., D.Sc., Lecturer and Demonstrator in Chemistry, University of Birmingham.

WITH FIGURES IN THE TEXT.

Together with AN INTRODUCTION TO THE STUDY OF
PHYSICAL CHEMISTRY,

By SIR WILLIAM RAMSAY, K.C.B., F.R.S.
Crown 8vo, 5s.

"It is not an easy subject to treat, and to do so in a clear, concise, and orderly manner which can be understood by anyone who possesses a knowledge of the principles of physical chemistry, is indeed difficult. This is the task which Dr. Findlay set himself, and he has been completely successful."-Colliery Guardian.

"If the succeeding issues are as excellent as this, then a notable and indispensable addition will be made to the library of the student of chemistry."-Journal of Education.

SIR WILLIAM RAMSAY'S

INTRODUCTION TO PHYSICAL
CHEMISTRY"

is also issued separately, price Is. net.

...

"In this essay Sir William Ramsay gives an excellent historical sketch of the growth and development of the science of chemistry during the last two centuries, and especially of the new ideas which have created the modern science known as physical chemistry, The subject with which Dr. Findlay has had to deal is not in any sense "popular." nor does it lend itself to popular treatment; but the earnest student of chemistry will appreciate the importance and value of the instruction given in these pages, and the lucidity of the writer's exposition. The volume itself is neat and attractive in appearance, and reflects credit on the publishers."

-Engineering.

ELECTRO-CHEMISTRY.

Part I.-GENERAL THEORY.

By R. A. LEhfeldt, d.Sc., Professor of Physics at the East London Technical College. Including a Chapter on the Relation of Chemical Constitution to Conductivity, by T. S. Moore, B.A., B.Sc., Lecturer in the University of Birmingham.

Crown 8vo, 5s.

"The book is to be heartily recommended, and we await with interest the second volume, in which the author hopes to discuss the most important applications of the theory to primary and secondary cells, to electrolysis and to the solution of chemical problems."-Electrician. Part II.--Applications to Electrolysis, Primary and Secondary Batteries, &c. [In preparation.

CHEMICAL STATICS & DYNAMICS Including the Theories of Chemical Change, Catalysis, and Explosions.

By J. W. MELLOR, D.Sc. (N.Z.), B.Sc. (Vict.). Crown 8vo, 7s. 6d.

**Other Volumes of the Series are in Preparation.

LONGMANS, GREEN, & CO.,

39 PATERNOSTER ROW, LONDON, E.C.

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TECHNICS.

A MAGAZINE TO AID TECHNICAL PROGRESS.

JANUARY. NINEPENCE NET.

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R. H. HOUSMAN, B Sc., M.I.E.E. Frontispiece.

PROGRESS OF SCIENCE AND TECHNOLOGY.

THE BALLISTICS OF MODERN RIFLES. By R. H. HOUSMAN
B.Sc., M.I.E.E.

THE SAFETY OF SUBMARINES. BY ALAN H. BURGOYNE, F. R.G.S.
THE PETROLITE LAMP.

THE FIBROUS CONSTITUENTS OF PAPER. BY CLAYTON BEADLE.
HOW TO COLLECT SPILLED MERCURY.

THE METALLOGRAPHY OF STEEL. By PERCY LONGMUIR.
A NEW PROPERTY OF THE MERCURY VAPOUR LAMP.
THE ELECTRO-MAGNETIC THEORY. Explained without the use
of the Higher Mathematics. Part IV. By EDWIN EDSER, A.R.C.Sc.
THE ELEMENTS OF CHEMICAL ENGINEERING. Part II. By
J. GROSSMANN, M.A., Ph.D., F.I.C.

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NEW RAPID MERCURY W. WILSON,

INTERRUPTER.

This is an improved Double Dipper Break with a simple and reliable method of raising and lowering the mercury.

Special attention is drawn to the motor, which is of English make, and not a toy.

Price £5 50

If you need a SWITCH
BOARD with resistance
for any circuit, call and
see ours, or write for par-
ticulars before purchasing.

A. C. COSSOR,
54 FARRINGDON ROAD, LONDON.
Telephone: 1c547 Central.
Gold Medal Awarded

St. Louis Fxhibition, 1904.

Maker of

SPECTROSCOPES, SPECTROMETERS,

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