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Volcanoes of Great

By Sir ARCHIBALD GEIKIE, K.C.B., P.R.S. 2 vols. Royal 8vo. 36s. net.

Britain.

The Scenery and Geology of Scotland, Viewed in Connexion with its Physical Geology. ARCHIBALD GEIKIE, K. C. B., P.R.S. Illustrated. 3rd Edition. Crown 8vo. IOS. net.

P.R.S. 8vo. IOS. net.

By Sir

By Prof. W. W. WATTS, M.A., F.R.S.

The Founders of Geology. BY SI ARCHIBALD GEIKIE, K.C.B.,
Geology for Beginners. Globe Svo.
An Introduction to Geology.

throughout. Crown 8vo. IIS. net.

The Scenery of England and

2s. 6d.

By Prof. W. B. SCOTT, Ph.D.,
LL.D. 2nd Edition, revised

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the Causes

to Which it is Due. By Lord AVEBURY, F.R.S., D.C.L. Crown 8vo. 65. By Lord AVEBURY, F.R.S., The Scenery of Switzerland. B.C.L. Crown Svo. 65. Volcanoes of North America. By Prof. 1. C. RUSSELL. The Geology of South Africa. By F. H. HATCH, Ph.D., and

B.Sc. 8vo. 215. net.

8vo. 16s. net.

G. S. CORSTORPHINE,

By the Rt. Hon. Lord

Popular Lectures and Addresses. KELVIN, F.R.S.

Geology and General Physics. Crown 8vo. 7s. 6d.

[NATURE Series.

Physics of the Earth's Crust. By Rev. OSMOND FISHER,

enlarged. 8vo. 125.

M.A., F.G.S. 2nd Edition,

By Prof. KARL A. von ZITTEL.

Text-Book of Palæontology. Translated by CHARLES R.

EASTMAN, Ph.D. 8vo. Vol. I. 25s. net. Vol. II. IOS. net.

Elements of Crystallography, for Students of Chemistry, Physics, and Mineralogy. By G. H. WILLIAMS, Ph.D.

Crown 8vo. 6s.

Mineralogy. By Prof. H. A. MIERS, F.R.S. 8vo. 255. net.

A Treatise on Ore Deposits. Revised And PHILLIPS, F.R.S.

H. LOUIS, M.A. 8vo. 28s.

Re-written by Prof.

Rocks, Rock Weathering, and Soils. By Prof. G. P.

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Colliery Surveying. Manager Aspirants.

F.G.S. 6th Impression, revised and enlarged. Globe 8vo. 3s. 6d.

A Primer of Explosives for the use of Local Inspectors and Dealers. By Major A. COOPER-KEY. Fcap. 8vo.

IS.

I. MINERALOGY.

Our new MINERALOGICAL SUMMER-TERM LIST No. 9 gives a short survey of the latest additions to our stock of new and especially remarkable minerals; finest large specimens for museum show-cases, &c. Great supply of most beautiful new specimens and large crystals of Benitoite and Carlosite; magnificent crystals of Rubellite from Brazil (new (ccurrence): Diamants from the new finds in German South-West Africa; choice Ural and Japan Minerals: Topaze, Emerald, Pyrrhite, Copper Pyrites (Groth Zeitschr. XLIII., p. 47), Danburite, Epidote, Naëgite, &c.

THE CULLINAN DIAMOND. Imitation in finest crystal glass, showing the natural colour and form. Price 8s. 6d. Imitations of the nine large brilliants cut from the Cullinan Diamond, in elegant case. £1 10s.

New Collections of Polished Mineral Sections for optica purposes, neatly mounted; special Price List just out, sent free on application.

II. PALEONTOLOGY.

The new PALEONTOLOGICAL SUMMER-TERM LIST No. 34 has just been published, and gives all particulars as to numerous additions to our encrmous stock of fossils.

1. Palæobotany: preparations of plants from the Devonian and Carbonian; Tæniopteris from Asia Minor.

2. Invertebrata: Bosporus - Trias and Devonian; magnificent Ancyloceras gigas from the English Gault.

3. Vertebrata: Capitosaurus, Mystriosaurus, Ichthyosaurus, &c.. excellent specimens. Lepidotus elvensis, Ursus spelreus, &c.

Dr. F. KRANTZ,

RHENISH MINERAL OFFICE, BONN-ON-RHINE, GERMANY.
ESTABLISHED 1833.
ESTABLISHED 1833.

LIVING SPECIMENS FOR
THE MICROSCOPE.

Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price 15. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes.

THOMAS BOLTON,

25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM.

THE LABORATORY, PLYMOUTH. The following animals can always be supplied, either living or preserved by the best methods :

Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcy. onium; Hormiphora (preserved); leptoplana; Lineus, Amphiporus, Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone, Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c. For prices and more detailed lists apply to Biological Laboratory, Plymouth.

THE DIRECTOR.

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WATKINS & DONCASTER,

Naturalists and Manufacturers of

CABINETS AND APPARATUS

FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
BRANCHES OF NATURAL HISTORY.

SPECIAL SHOW-ROOM FOR CABINETS.
N.B. For Excellence and Superiority of Cabinets and Apparatus,
references are permitted to distinguished patrons, Museums, Colleges, &c.
A LARGE STOCK OF Insects, birds' eggs AND SKINS.
SPECIALITY.-Objects for Nature Study,
Drawing Classes, &c.

Birds, Mammals, &c., Preserved and Mounted by First-class Workmen true to Nature.

All Books and Publications on Natural History supplied. 36 STRAND, LONDON, W.C.

(Five Doors from Charing Cross.) CATALOGUE (102 pp.) POST FREE.

ETHNOGRAPHICAL SPECIMENS.

Selection of over 16,000 guaranteed genuine Savage Weapons, Ornaments, Implements, Idols, &c., &c., each accurately localized and named.

General Catalogue free. Monthly Illustrated Catalogue, 6d., per year, 5/6. Specimens bought or exchanged.

W. O. OLDMAN,

77 Brixton Hill, London, England.

The New and Rare Indian

MINERALS

HOLLANDITE, WINCHITE,

and other choice specimens,
now on view and sale at

THOMAS D. RUSSELL'S

Ground-Floor Show Rooms,

11 JOHN STREET, BEDFORD ROW, LONDON, W.C. John Street (Theobald's Road) is reached from Holborn by Gray's Inn Road or Warwick Court.

MINERALOGY, GEOLOGY & PETROLOGY.

Single Specimens and Collections

for Prospectors, Teachers and Students.

Rock Sections, Well-cut. Fossils from all Formations. Metallic Ores from all Parts. Minerals for Chemical Purposes. LISTS FREE from

JAMES R. GREGORY & CO., Mineralogists, 139 FULHAM ROAD, SOUTH KENSINGTON, S.W. Telephone No. 2841 Western. Tel. Add., "Meteorites," London.

NOTICE.-Advertisements and business letters for "Nature" should be addressed to the Publishers; Editorial Com. munications to the Editor. The telegraphic address of "Nature" is "Phusis," London. Telephone-Gerrard, 8830. SUBSCRIPTIONS TO "NATURE."

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(A charge of 6d. is made for changing Scotch and Irish Cheques.) Cloth Cases for binding "Nature" are issued at 1s. 6d. each, and can be sent post free for 1s. 9d.

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Cheques and Money Orders should be made payable to MACMILLAN & CO., Limited.
OFFICE: ST. MARTIN'S STREET, LONDON, W.C.

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A practical and moderately priced source of Flame easily controlled from any temperature up to above the steady, high voltage current.

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melting point of cast-iron.

When once set it is entirely automatic in working.

Injector as illustrated, without Fur- £14 10s.

nace and Feed Pump

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Ditto, ditto, with Feed Pump £15 8s.

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34 Camomile Street, London, E.C.

THE 'SOHO' STEREOSCOPIC REFLEX CAMERA.

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The above Combined Standard, fitted also with Electrical Illumination.

Names of a few Laboratories fitted by us:

Government Laboratory; Government Vaccine Station, Hendon ; Custom House Laboratory; Cambridge University; St. Bartholomew's Hospital Pathological Block, also Chemical; Imperial College of Science; Sir J. Cass Institute; Hackney Institute; Ladies' College, Cheltenham; and many others.

Particulars and Catalogue Free on application.

Charlotte

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BROWN & SON, Murin street, C, arlotte, street, MARION & CO., LTD., 22, 23 Soho Square,

King's Cross, London, N.

LONDON,

Printed by RICHARD CLAY & 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, July 8, 1903.

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[PRICE SIXPENCE

[All Rights are Reserved.

REYNOLDS & BRANSON, Ltd.

Manufacturers of Chemical and Physical Apparatus.
HYDRAULIC PRESS.
(Dr. Pocklington's form.)

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FOR COLLEGES AND SCHOOLS. IMPROVED PATTERN. ALL PARTS READILY VISIBLE. SILVER VALVES. This Press has been specially designed for the use of Teachers. &c., who desire to illustrate the great multiplication of force obtainable by utilising the laws of Hydrostatics alone; at the same time it will be found useful for experiments on regelation, &c., where pressures amounting to half-a-ton or upwards are required. Price £2 2s.

Catalogues of Apparatus and Chemicals post free.

14 COMMERCIAL STREET, LEEDS.

Negretti & Zambra's

SELF-RECORDING

Meteorological
Instruments.

The STANDARD

RECORDING
RAIN GAUGE

(Halliwell's Patent),

In Improved Copper Case.

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