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W. WILSON.

VERNIER

THE SYTAM SYSTEM

Saves an incredible amount of wall space and MICROSCOPE. | completely utilises dark corners, recesses, and Horizontal and Vertical Scales ;

out-of-the-way places. 16 cm. in length. The microscope

Prevents crowding and confusion. rotates on a horizontal axis, and

Allows for extension as and when required.
can be clamped in any position. Always room for more, hence reorganisation

One power and one Eye-piece. | seldom or never necessary.
With Scales reading to 'I mm. £6 10 Saves time, lightens work, and increases comfort

... '05, 70 by producing perfect order in the Laboratory,
» 02, 710 Library, Study, Home, Office. &e.
, 01, 85

SOME SYTAM FITTINGS. | BELMONT STREET, CHALK FARM, N.W.

THE BOTTLE ELEMENT.

One hundred 4 oz. bottles are arranged in one Sytam Bottle - Element occupying less than 1 sq. ft. of wall space, each bottle is instantly

located, removed or replaced, and any size from OF THE HIGHEST ACTIVITY

d-oz. to a Winchester can be accommodated in IN 5 mg. TUBES.

one and the same element. Only a Few Tubes left.

2. THE CLOSED-FRONT BOOK ELEMENT. ARMBRECHT, NELSON & CO., 3. THE OPEN-FRONT BOOK ELEMENT.

71 & 73 DUKE STREET, GROSVENOR SQUARE, W. 4 THE AUTHOR'S FILE Telephone : GERRARD, 1942.

For division of subject into headings, chapters

or sections, 18-inch Apps-Newton Coil for sale, in perfect

| 5. condition. No trace of oxidation on the vulcanite. G. BOWRON,

THE TWIN DESK TRAYS. 57 Edgware Road, W.

6. THE PAMPHLET FILE. Metallurgical Laboratory, well equipped for experimental work, to let at low rent. One minute from Station.

THE SYTAM FITTINGS CO., Fifteen minutes to City. Apply MARSHALL & Co., Campbell Works, Stoke Newington, X. (close to Station, G.E.R.). Tel., 19 Dal-ton. | 18 & 19 BASINGHALL BUILDINGS, LEEDS.

RADIUM BROMIDE

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1 NATURE says :-“This is one of the most compact and efficient condensers which has come before our notice. We have tested it for condensing such volatile substances as ether, carbon disulphide, and acetone, and have found that even with rapid distillation the condensation is very complete. Generally speaking, in order to condense these substances satisfactorily, it is necessary to employ a very long condenser ; of course, this means using a great amount of bench space. As the new condensers are used in a perpendicular posi. tion, the saving in space is very great."

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This apparatus, when working off a 10 in. Coil, will give from 800 to 1000

milli amperes.

Price, as illustrated, 2-. but with New Pattern Spark Gap and New

Connections,

£12. TALLA

Chaplin's Universal Holder & Electrodes,

£4 10s.

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Full particulars of above, and all other forms of ElectroTherapeutic Apparatus, are contained in our ILLUSTRATED CATALOGUE in X-RAYS, &c. (including Instructions to

Beginners), post free.

Apparatus for estimation of sulphur in

Importers, Manufacturers, and Dealers in
CHEMICAL AND PHYSICAL

APPARATUS
Of every Description.
Fine Chemicals, Volumetric Solutions,

Plain and Stoppered Bottles, AND EVERY LABORATORY REQUIREMENT, Illustrated Catalogue of Apparatus, with Price

List of Chemicals, free on application. Telegraphic Address—"APPARATUS, MANCHESTER."

Telephone Number—7238.

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I

SECOND-HAND TELESCOPES. 6 in. Dallmeyer Equatorial, Clock, complete, £100, 41 in. Alvan Clark, Equatorial by Cooke, £50. Several 3 in. Student Telescopes, by

leading makers, £4 10s., £6 10s., £8 10s., £10. SECOND-HAND SPECTROSCOPES. Single, 2, and 3 Prism, by Browning, £4 10s., £8 10s., £10.

SECOND-HAND MICROSCOPES. Watson's Edinburgh H., 3 powers and fittings, complete, as new, £16 10s. Swift Army Bacieria, complete, £15. Leitz 2b, with rack,

substage, and fittings, £6 10s. MANY OTHERS, ALL KINDS. LISTS ON APPLICATION.

A. CLARKSON & CO., 28 BARTLETT'S BUILDINGS, HOLBORN CIRCUS, LONDON.

BY STANDARD MAKERS, IN PERFECT WORKING ORDER, AT

EXTREMELY MODERATE PRICES. As supplied to the National Physical Laboratory; Aberdeen, Aberystwyth, Birmingham, Nottingham and Glasgow Universities; Bedford, Bradford, Clifton, Heriot Watt and Yorkshire Colleges; and twenty other Scientific

Institutions, Polytechnics, &c. DE NATURE says: "Teachers requiring efficient apparatus at a low cost for lecture or laboratory purposes, migbt consult the list with advantage."

List on application by mentioning NATURE.

Accurate and

Inexpensive.

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PRICE

ALFRED E. DEAN,

21/

THE LARGEST MAKER IN ENGLAND

of Apparatus in all Departments of

ELECTRO-THERAPEUTICS

THE NEW PATENT

PIESMIC BAROMETER.

including Radiography, High Frequency, Hydro-Electric and
Light Baths, Finsen and other Light, Cautery, Electrolysis, &c.

INDUCTION COILS AND STATIC MACHINES A SPECIALITY.
CONTRACTOR TO THE WAR OFFICE, INDIA OFFICE, AND ADMIRALTY,

BRITISH AND FOREIGN HOSPITALS, &c.

LISTS ON APPLICATION.

Descriptive

Pamphlet
Post Free.

To be obtained of all Opticians, or

the SOLE MAKERS, F. DARTON & CO..

CLERKENWELL OPTICAL WORKS,

REMAINDERS OF

AND RADIOLOGY,

SCIENTIFIC AND
EDUCATIONAL BOOKS

STANDARD WORKS ON NATURAL
NEW & SECOND HAND.
LARGEST STOCK in LONDON of SECOND.
HAND School, Classical, Mechanical, ELEMEN.

HISTORY, &c., TARY and ADVANCED SCIENTIFIC BOOKS at about HALF PUBLISHED PRICE.

at very low prices. Mathematical, Theological, and foreign Books.

ALL NEW AS PUBLIS AED. KEYS AND TRANSLATIONS.

Adams (Henry, F.L.S., and Arthur)-The Genera J. POOLE & CO.

of Recent Mollusca, with 138 full page plates, containing

thousands of figures arranged by Sowerby, 3 thick vols., 8vo (ESTABLISHED 1854),

(pub. £4 10s.) ... ... ... ... 16s. 6d., postage tod. 104 CHARING CROSS ROAD,

Browne (Montagu, F.G.S.)- Artistic and ScienLONDON, W.C.

tific Taxidermy and Modelling, a Manual of In-truction in (Formerly of 39 HOLYWELL STREET, STRAND)

the Methods of Preserving Natural Objects, Modelling of Foliage, Enquiries by letter receive immediate attention.

&c., 22 full-page engravings and a text illustrations, 8vo gilt

extra ( 41 is.) ... ... A. & C. BLACK, 53., postage 6d. ROYAL IRISH ACADEMY

Cooke (M. C.)—The British Fungi: A Plain and

Easy Account of, coloured plates of 40 species, cr. 8vo (65.) PROCEEDINGS.

3s., postage 4d. Volone XXV. Secti in B. No. 5. Sewed, 6d.

-Microscopic Fungi : An Introduction to the ON THE GROWTH OF CRYSTALS IN THE CONTACT

S'udy of Microscopic Fungi, Rust, Smut, Mildew, and Mould, ZONE OF GRANITE AND AMPHIBOLITE.

269 culoured figures, by J. E. Sowerby, cr. 8vo 165.)

3s., postage 4d. By GRENVILLE A. J. COLE.

Dallas (W. S.)- Elements of Entomology: An WILLIAMS & NORGATE, 14 Henrietta Street, London, W.C.

Outline of the Natural History and Classification of

British Insects. Illustrated with 21 text engravings of Beetles, The Official Organ of the British Electrotherapeutic Society.

Grasshoppers, Butterflies, Moths, &c , post 8v (pub. 8s. 6d.)

1s. 6d., postage 4d. MEDICAL ELECTROLOGY Dixon (Charles)- The Story of the Birds, the

Origin and Salient Characteri-lics of Birds, their Groups, Distribution in Space, Means of Dispersal and Migrations, General Habits and Functions, Love Displays, Repro luction, Nest, and

Eggs, cr. 8vo (pub. 55.) GEORGE ALLEN, 18. 9d., postage 4d. AN INTERNATIONAL MONTHLY REVIEW COVERING ALL BRANCHES OF ELECTROTHERAPEUTICS.

Emerson (P. H.)-Birds, Beasts, and Fishes of Subscriprion, 12/- per Annum, Post Free throughout the World.

the Norfolk Broadland, 68 full page and text illustrations, Single Numbers, 1/-; Post Free, 1/2.

Svo (pub 12$ 6d.)... .. .. Nutt, 4s. 6d., postage sd. LONDON: A. SIEGLE, 2 LANGHAM PLACE, W.

Greg (R. P., F.G.S.) and William Lettsom

Manual of the Mineralogy of Great Britain and Ireland,

illustrated, 8vw (pub. 155.) ... 1s. 6d., postage sa.

Jenyns (Leonard) – Observations in Natural and Periodicals promptly supplied at lowest rates.

History (being a companion work to White's "Selborne "), with an in roduction on ha hits of observing as connected with the study

of that science, also a Calendar of Periodic Phenomena in Natural CATALOGUES POST FREE ON APPLICATION.

History, post 8vo (pub ros. 64.) ... . 3s., postage 40'. W. MULLER,

Jones (Professor T. Rymer, F.R.S.)-The Aqua

rium Naturalist, A Manual for tbe Seaside, containing about 59 CASTLE STREET EAST, OXFORD STREET, LONDON, W. 100 coloured illustrations of interesting objects of the seashore,

thick post 8vo (nearly 530 pages) (pub. 185.) 3s., postage 4d. “The best of all the seaside books which have come under our notice." Rimmer (R. — The Land and Freshwater Shells of the British Isles, illustrated, 8vo (pub. 55.)

2s., postage 4d.

Smith (J., A.L.S.)- British and Foreign Ferns: All books advertised and reviewed in NATURE are supplied

with a Treatise on their Cultivation. Revi-ed and greatly at lowest cash prices,

enlarged, with many illustrations, 450 pp., cr. 8vo (pub. 75. 6d.). Orders by post promptly dispatched.

25., postage 4d. 85 PRAED STREET, LONDON, W.

Taylor (J. E.)-Flowers: Their Origin, Shapes,

Perfumes, and colours, 32 coloured figures, and 161 woodcuts, With 30 Original Illustrations. Price 25. 60.

cr. 8vo (pub. 75. 6d.) ... ... ... 2s.6d., postage 4d. The HYGIENE of the MOUTH.

- The Aquarium : Its Inhabitants, Structure, and A Guide to tbo Prevention and Control of Dental Diseases.

Manageinent, with 238 woodcuts, cr. 8vo (pub. 35. 6d.) BR. DENISON PEDLEY, L.D.S. Eng., F.R.C.S. Ed.,

2s., postage 4d. Dental Surgeon to the Evelina Hospital, Southwark.

- Half-Hours at the Seaside, illustrated with BY THE SAME AUTHOR. The DISEASES OF CHILDREN'S TEETH

250 woodcuts, cr. 8vo (pub. 2s. 6d) ... ... 2s., postage 4d. Well Illustrated. Price 7s. 6d.

-Half-Hours in the Green Lanes, illustrated SEGG & CO., 289 and agı Regent Street, London, W.

with 300 woodcuts, cr. 8vo, gilt edges (pub. 25. 6d.)

2s., postaze 4d. Theobald (F. V.)—The Parasitic Diseases of

Poultry (Animal and Vegetable, including Chapters on Protozoa,
Insects, Mites and Worms, with List of Parasites upon Domestic
Cocks and Hens, &c.), 23 illustrations, post 8vo (pub 25. 6d )

1s. 6d., postage 3d. at 1716 per pound bar, or 4 oz. 6

New Catalogue free on application, minimum. ARMBRECHT, NELSON & CO.,

JOHN GRANT, Wholesale Bookseller, 71 & 73 DUKE STREET, GROSVENOR SQUARE, W.

31 GEORGE IV. BRIDGE, EDINBURGH. Telepbone : GERRARD, 1942.

FOREIGN SCIENTIFIC BOOKS

THOMAS PRINCE, SCIENTIFIC BOOKSELLER

CALCIUM METAL

99.3 to 99.6

Complete in THREE VOLUMES, Hall-Bound.
Vol. I., with 236 Illustrations, 8vo, £2 2s. Vol. II., with 240 Illustrations, 8vo, £2 2s

Vol. III., with 352 Illustrations, 8vo, £3 3s.

A DICTIONARY of APPLIED CHEMISTRY

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WORKS by G. S. NEWTH, F.I.C., F.C.S., Demonstrator in the Royal College of Science, London; Assistant Examiner in Chemistry,

Board of Education,
A TEXT-BOOK OF INORGANIC CHEMISTRY.

Tenth Edition. With 155 Illustrations. Crown 8vo. 6s. 6d.
CHEMICAL ANALYSIS, QUANTITATIVE & QUALITATIVE.

Fifth Edition. With 100 Illustrations. Crown 8vo. 6s. 6d.
CHEMICAL LECTURE EXPERIMENTS.

New Edition. With 230 Diagrams. Crown 8vo. 6s.
ELEMENTARY PRACTICAL CHEMISTRY.

With 108 Illustrations and 254 Experiments. Crown 8vo. 2s. 6d.

LONGMANS, GREEN & CO., 39 PATERNOSTER ROW, LONDON, E.C. THE EXECUTORS OF THE LATE

ROYAL SOCIETY OF LONDON.

MACKINNON RESEARCH STUDENTSHIPS. COLONEL WATKIN, C.B. (Inventor of the Range Finder) are

There are two Studentships each of the value of £150. One of them is offering the following for sale :

awarded for research in the group of the Physical Sciences, including 1. 6 in. Holtzaffel Lathe, with divided headstock and overhead gear, 1 Astronomy, Chemistry, Geology, Mineralogy and Physics. The other is

and a very complete set of fittings, for engine, wood and metal awarded for research in the group of the Biological Sciences, including turning, with a numerous assortment of small tools.

Anatomy, Botany, Palæontology, Pathology, Physiology and Zoology,

The Studentships are awarded annually for one year, but are renew. II. 4 H.P. de Dion engine, water cooled with tanks, &c., and dynamo

1 able for a second year. Under exceptional circumstances they may be by Canning and Co., 30 volts, 20 amps..

renewed for a third year. The Studentships are restricted to Britisb III. 7-0 volt Accumulators in teak cases, 9 amps.

subjects. IV. H.P. Crocker Wheeler Motor.

Applications must be received not later than June 5. Further V. in. Spark Coil.

į particulars and forms of application can be obtained from the Assistant VI. X-Ray Apparatus, consisting of 12 in. spark coil, 3 Crookes' tubes, Secretary of the Royal Society, Burlington House, London, W. screens, &c.

GRATIS ON APPLICATION. VI. Carpenter's Bench and Tools.

Catalogue of Second-hand Books on Natural The whole can be seen hy appointment at Ordnance House, Enfield

Science, Zoology, Botany, Geology, &c., 2000 items.-W. HEFFER Lock, Middlesex, or particulars may be obtained from Mr. HICKS,

AND SONS, Booksellers, Cambridge. Mathematical Instrument Maker, 8 Hatton Garden, London,

THE ENTOMOLOGISTS' MONTHLY TO SCIENCE MASTERS, especially those

MAGAZINE.

Price Sixpence, Monthly. taking ELECTRICITY as a special subject. Wanted by July ı next!

Edited by G. C. CHAMPION, F.z.s., J. W. Douglas, W. W. Fowi KR, for important College, well-qualified Master for Electricity and who

M.A., F.L.S., R. McLACHLAN, F.R.S., E. SAUNDERS, F.L.S., and has had some experience in the organisation of the work of a local

LORD WALSINGHAM, M.A., LL.D., F.R.S.
Technical Instruction Committee. Salary, 6150 to 6200 per annum.
Candidates for the above and those seeking posts for the term com

This Magazine, commenced in 1864, contains standard articles and notes

on all subiects connected with Entomology, and especially on the Insects of mencing in September next hould apply forthwith, giving details as

| the British Isles. to qualifications and enclosing copies of testimonials, to GRIFFITHS, SMITH, POWELL & SMITH. School Agents (Estd. 1833), 34 Bedford

Subscription--Six Shillings per Annum, post free. Street, Strand, London.

London : GURNEY & JACKSON (Mr. Van Voorst's Successors),

i Paternoster Row.

JUST PUBLISHED.

TWENTY-SIX CRADUATED EXERCISES IN CRAPHIC STATICS,

some in Two Colours, and with Skeleton Data to practise upon, and including the Application to Roofs, Moving Locomotives, Retaining Walls, Lévy's Steel Arches, Girders (Original Constructions), Masonry Arches, Lévy's Weight Tables, with an Essay on Graphical Statics, in the form of a Running Commentary on the Exercises, each of which has full Instructions printed on its face, the

whole forming a Supplement to the Authors' Elementary Applied Mechanics, By T. ALEXANDER, M.Inst.C.E.I., Professor of Engineering, Trinity College, Dublin ; and A. W. THOMSON, D.Sc., C.E., Professor of Engineering, College of Science, Poona.

FCAP. BROADSIDE. SEWED. 10s.

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JUST PUBLISHED.
JOURNAL OF THE ANTHROPO-

LOGICAL INSTITUTE.
Vol. XXXIV. Part II. JULY-DECEMBER, 1904.

Contents :-
Les Six Races composant la population actuelle de l'Europe (the Huxley
Lecture) Dr. J. DENIKER.- The Magic Origin of Moorish Designs,
Dr. E. WESTERMARCK.-Native Stories from Santa Cruz. Rev. W
O'TARALL-A Sea Dyak Love Philtre. Rev. W. HOWELL and R.
SHELORD.-Further Notes on the Kikuyu Tribe of Brilish East Africa.
H. R. TATE.-A Method of Estimating Skull Capacity by Peripheral
Measures. J. BEDDOR, M.D., F.R.S -Languages of the Wiradyuri and
che Tribes of New South Wales. R. H. MATHEWS.-Notes on some
Chilian Skulls and other Remains. R. E. LATCHAM - Further Excavations
ca a Palæolithic Site at Ipswich. N. F. LAYARD.- Ethnology of the
Su Eelis and Sk'aülits of British Columbia. C. HILL TOUT.
WITH MANY FULL-TAGE PLATES AND ILLUSTRATIONS IN THE TEXT.

Price 10s. net.
Laxdox: THE ANTHROPOLOGICAL INSTITUTE, 3 Hanover

SOC4R8, W.; OR THROUGH ANY BOOKSELLER

SPINTHARISCOPE

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MICROSCOPIC SLIDES, MARINE OBJECTS, Hydrozoa extended without pressure, sponge sections, &c. Apply for Lists.

Dispersal of Mr. HORNELL'S collection. Flower and Leaf Buds, Stens, Roots, &c., new, from 3d, each. Lists.

Exhinition Groups of Diatoms, &c, in symmetrical patterns.

EDINBURGH H., by Watson, for sale, and others : several Objectives,
Condensers, &c. PRISMATIC BINOCULARS, LANTERN SLIDES,
Church Architecture, Swiss, Egypt and Holy Land views, all first class.

Fine mounted collec'ion of Grasses, Mosses, Ferns, Marine Algæ.
Detailed List sent on application, as stock is always changing.
Mr. HERBERT CLARKE, 104 LEADENHALL STREET, E.C.

Tel. :1316 CENTRAL.

as devised by SIR WILLIAM CROOKES. Showing the Scintillations of Radium. Price, WITH LENS... ... ... ... $1 1 0 CHEAPER FORM OF ABOVE

15 0
The Scintillations seen in this instrument are from
Pure Radium Bromide of the Highest Known Activity,
and are brighter and more plentiful than those pro-
duced from Pitchtlende or other bodies of low
radio-activity.
A. C. COSSOR, 54 Farringdon Rd., London.

Telephone 10547 Central.
GOLD MEDAL awarded St. Louis Exhibition, 1904.

RUBIDIUM, TANTALUM, GERMANIUM,

CÆSIUM, BERYLLIUM, AND OTHERS, DRAWING INSTRUMENTS. Ask for Table of Rare Elements by E. L. N. ARMBRECHT,

in Gramme Tubes at Reasonable Prices.

71 & 73 DUKE STREET, GROSVENOR SQUARE, W. Best Make and Finish.

Telephone : GERRARD, 4942.
SET SQUARES,
T SQUARES,

JUST PUBLISHED. 290 pages, 8vo. cloth, price 4s. 6d. net.

| Important New Publication issued by the Chemical Society. DRAWING BOARDS. !

ANNUAL REPORTS on the PROGRESS Obtained through any Optician.

of CHEMISTRY for 1904. An eritome of the principal definite steps in advance which have been

accomplished during the year 1004. ROBERT NICHOLL, 153 HIGH HOLBORN, LONDON. GURNEY & JACKSON, 10 PATERNOSTER Row, LONDON, E.C.

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RECENT & COMING ECLIPSES.

BY

Sir NORMAN LOCKYER, K.C.B., F.R.S. Second Edition, containing an account of the Observations made at Viziadrug, in India, in 1898, and of the conditions of the Eclipses

visible in 1900, 1901 and 1905. 8vo. 6s. net.

MACMILLAN AND CO., LIMITED, LONDON. HARVEY & PEAK

(BY APPOINTMENT TO THE ROYAL INSTITUTION

OF GREAT BRITAIN.)

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WAVE MOTION.

Makers of the new Apparatus illustrating Wave Motion,

designed and used by Dr. J. A. FLEMING in the Christmas Lectures at the Royal Institution.

READING MICROSCOPES, RESISTANCE COILS, &c. 56 CHARING CROSS ROAD, LONDON, W.C.

1 SPECIAL TERMS TO COLLEGES, SCHOOLS, INSTITUTES, &c.

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