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ILLUSTRATED LIST (“A”) OF SPECTROSCOPES AND ACCESSORIES GRATIS. ADAM HILGER, Ltd., 75a Camden Road, London, N.W.

AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.

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PETROGRAPHICAL

MICROSCOPE. BAUSCH & LOMB'S New Perfected Model. This Instrument has been brought right up to date, and the Stand is of the improved Horseshoe form, with circular revolving stage and graduated scale in m/m at right angles, with special substage, fine adjustment, and diagonal Rack and Pinion movement. The fine adjustment has dust-proof collar, adjustDent for Bertrand Lens by rack and pinion, with slits for quartz wedge, sliding prism box, Íris diaphragm between prism box and Bertrand Lens, with triple nose-piece and centring adjustment. Complete with polarising apparatus, large nickel prism in revolving mounting, with German silver graduated scale, including 14", 1", and l" objectives; 2", 19", and 1"

hair-line eyepieces, in Mahogany cabinet, £36. WE HAVE MODIFICATIONS OF THIS INSTRUMENT

FROM £21 17s. Bd., UPWARDS. We shall be pleased to show this instrument, together with our large collection of Student, Bacteriological, Metallurgical and

Chemical Microscopes to interested clients.

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OF EVERY DESCRIPTION, INCLUDING STANDARD MERCURIAL BAROMETERS,

STANDARD ANEROID BAROMETERS, STANDARD THERMOMETERS of every KIND, PUMPS BOTH FOR VACUUM & PRESSURE, Air Meters, Anemometers, Boiling Point Apparatus, Burettes, CATHETOMETERS, Clinometers, Drawing Instruments, Eudiometers, Gas, Steam and Water

Gauges, Hydrometers, MICROSCOPES, Plane Tables, POLARIMETERS, Pyrometers,

FINDERS, SEXTANTS, Spectroscopes, Sphygmometers, Sunshine Recorders, THEODOLITES, Wind

Vanes, &c., &C., &c. Catalogues Post Free. (State which required.) ANY KIND OF SCIENTIFIC INSTRUMENT

MADE TO ORDER. Prompt Attention to all Orders and Inquiries.

© Exceptional Terms to Colleges, Institutions, &c. Quotations submitted for Laboratory Outfits or Single Instruments. THERMOMETERS FOR STUDENT WORK A SPECIALITY.

Sole Representatives of the BAUSCH & LOMB

OPTICAL CO., for U.K. and Colonies, A. E. STALEY & CO.,

Contractors to H.M. Government, Universities, Hospitals, &o., 19 THAYIES INN, HOLBORN CIRCUS, LONDON, E.C.,

To whom all inquiries should be addressed. Write for Illustrated Microscopical Catalogue (84 pp.),

3 Stamps to cover postage. Also Lists of Microtomes, Centrifuges, Photographic Lenses,

RANGE

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BY APPOINTMENT TO THE ROYAL INSTITU.

TION OF GREAT BRITAIN.
POST OFFICE BRIDGE SETS AND
DEAD BEAT GALYANOMETERS.
POTENTIOMETERS. STUDENTS'
SPECTROMETERS. SPHEROMETERS.

INDUCTION COILS A SPECIALITY.

ELECTROMETER, NEW PATTERN. 56 CHARING CROSS ROAD, LONDON,

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W.c.

MACMILLAN & CO'S NEW BOOKS.

THE LIFE & EXPERIENCES OF Sir Henry Roscoe, D.C.L., LL.D., F.R.S. Written by Himself.

With Photogravure Portraits and other Illustrations. Svo.

125. net.

CHEMISTRY OF THE PROTEIDS.

By GUSTAV MANN, M.D. (Edin.), B.Sc.

(Oxon.), University Demonstrator of Physiology, Oxford. Based on Professor Otto Cohnheim's “Chemie der Eiweisskörper.” 8vo. 155. net.

NATURE.-" Its many excellences can be discovered by reading it and using it, and Dr. Mann is to be congratulated in having produced such a valuable addition to scientific literature."

NEW WORK ON ASTRONOMY BY SIMON NEWCOMB.
A COMPENDIUM OF SPHERICAL ASTRONOMY.

With its Applica

tions to the Determination and Reduction of Positions of the Fixed Stars. By SIMON NEWCOMB. 8vo. 125. 6d. net.

AN INTRODUCTION TO ASTRONOMY. By FOREST RAY MOULTON, Ph.D.

Illustrated. Crown 8vo. 55. net.

THE BIOLOGY OF THE FROG.

By SAMUEL J. HOLMES, Ph.D., Assistant Professor of Zoology in the University of Wisconsin. Illustrated.

Crown 8vo. 6s. 6d. net.

THE NEW EARTH.

A Recital of the Triumphs of Modern Agriculture in America. By W. S.

HARWOOD, Author of “New Creations in Plant Life.” With many Illustrations. Crown 8vo. 75. 6d. net.

WATKINS & DONCASTER,

Send for our

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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, refer
ences 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.)
ir CATALOGUE (102 pp.) POST FREE.

FLATTERS & GARNETT, Ltd.,

48 Deansgate,

Manchester.

LITHIUM METAL,

6s. per gramme.

BOTANICAL MICROSCOPIC SLIDES FOR STUDENTS.

Including Four Series, 50 Slides in each. Price £1 18. per Series ; adapted for Board of Education and London University Examinations, Illustrating Mitosis, Leucoplasts, Thyloses, Root, Stem, and Flower Development, Anomalous Stems, Embryo.sac Structure, Pollen Tubes, Botrydium, Edogonium, Coleochaete, Chara, Sexual Organs and Cystocarps in the Rhodophyceæ ; Peronospora, Saccharomyces, Claviceps, Puccinia, Antho. ceros, Pilularia, Marsilea, Isoetes, Psilotum, Selaginella, Pinus, &c.

Catalogue Post Free..
A. PENISTON, 5 MONTPELIER TERRACE, LEEDS.

NEW and EXTENDED EDITION of TABLE of RARE ELEMENTS, giving full scientific particulars, 6d. post free.

ARMBRECHT, NELSON & CO., 71 & 73 Duke Street, Grosvenor Square, London, W.

NOTICE OF REMOVAL. JAMES R. GREGORY & Co.,

MINERALOGISTS, &C.,

of KELSO PLACE, KENSINGTON, beg to announce that they have removed to more convenient

and commodious Premises at 139 FULHAM ROAD, SOUTH KENSINGTON, S.W.

Minerals, Rocks, Fossils, Metallic
Ores, Rough Precious Stones, &c.
A Large Assortment from all parts of the world always on view, and at

all prices. Inspection invited.
Crude Mineral for Chemistry Students and Technical Schools.
Single Crystals and Teaching Specimens in Great Variety.

RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington,

London, S.W.

SAVAGE CURIOSITIES.
LIVING SPECIMENS FOR

ETHNOGRAPHICAL SPECIMENS.
THE MICROSCOPE.

Stock of over 19,000 Specimens of Weapons, Implements, Ornaments,

Dress, Idols, Musical Instruments, &c., &c., used by all the Races of Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinospbærium, Mankind, for sale at very low prices. All objects guaranteed genuine. Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many

Trophies of genuine old Arms made for Billiard Rooms, Halls, &c., other specimens of Pond Life. Price is. per Tube, Post Free. Helix prices from 255. ; also mounted Horns.- Catalogue of Ethnographical pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. Specimens illustrated with Bromide Photographs, 4d. monthly, 3s. 6d.

yearly. Collections Arranged and Catalogued. Specimens bought. THOMAS BOLTON,

W. 0. OLDMAN, 77 BRIXTON HILL, LONDON, S.W. 25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION

Collections and Single Specimens of

British and Foreign OF THE UNITED KINGDOM.

MINERALS, ROCKS, FOSSILS. THE LABORATORY, PLYMOUTH.

25 Specimens, 5/6 ; 50 do., 10/6; 100 do., 21/- ; 200 do., 42/-, The following animals can always be supplied, either living 20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-.

In Polished Deal Boxes. or preserved by the best methods :

Sgcon; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, Alcy. Inspection invited of a large stock of Minerals, Rocks, Fossils, and onium: Hormiphora (preserved); Leptoplana; Lineus, `Amphiporus,

Microscopic Objects. Specimens sent on approval.
Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus,
Gammarus, Ligia Mysis, Nebalia, Carcinus ; Patella, Buccinum, Eledone, Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes,
Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, Models of Crystals, and other Apparatus for Geologists, &c.
Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c.

NEW CATALOGUES POST FREE.
Por prices and more detailed lists apply to
Biological Laboratory, Plymouth.

THE DIRECTOR. THOMAS D. RUSSELL, 78 Newgate St., London, E.C.
NOTICE:Advertisements and business letters for Nature should be addressed to the Publishers; Editorial
Communications to the Editor. The telegraphic address of NATURE is " Phusis," LONDON.
SUBSCRIPTIONS TO "NATURE."

CHARGES FOR ADVERTISEMENTS.
A s. d. TO ALL PLACES ABROAD:- & s. d.

A s. d.

A s. d. Yearly 18 o Yearly

*Three Lines in Column o 3 6 Quarter Page, or Half
Per Line after

a Column

1 15 0 0 14 6 Half-yearly

0 15 6 One Sixteenth Page, or Eighth Col. 10 Halla Page, or a Column 3 5 Quarterly 0 7 6 Quarterly

8 o One Eighth Page, or Quarter
Column

018 6 | Whole Page.
• The first line being in heavy type is charged for as Two Lines.
Cheques and Money Orders payable to MACMILLAN e co., Limited.

1 10 6

Half-yearly

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THE GAIFFE AUTO-MOTOR
MERCURY JET INTERRUPTER

(Patented in Britain).
NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR.

The interruption cuts the current both for motor and coil. In other words, motor and interrupter are electrically and mechanically linked together. Rups 500 working hours

without requiring attention. 00

İT See NATURE, July 20, 1905, page 277. The leading experts have reported in terms of the highest praise upon this Break after continuous use (vide Testirsenichi

Price, including box and packing, £4:6:6 THE MEDICAL SUPPLY ASSOCIATION, 228 Gray's Inn Road, London, W.c.

Descriptive Circular upon application. WATSON'S TELESCOPES WATSON'S MICROSCOPES.

FOR AMATEURS.
The "CENTURY," with 3-inch Objective, mounted on Garden £

23 DIFFERENT MODELS to select from, suited for

s. d. Tripod, with Altazimuth Head ...

15 0 0

every class of research. The “ ROYAL CENTURY," with 34-inch Objective, mounted on Garden Tripod, with Altazimuth Head, having move.

From $2 : 2 : 6 upwards. ments by screws and Hook's handles ...

36 10 0 The above are fitted with the beautiful Watson-Conrady

Watson's Microscopes are designed to afford the utmost conObjectives, yielding the finest performance.

venience and comfort combined with absolute accuracy for The POPULAR," with 3-inch Objective, mounted on Garden

scientific work. They are up-to-date and of highest quality. Tripod, with Altazimuth Head ...

9 100 For larger sizes of above and full particulars of

For full particulars see WATSON'S TELESCOPES WATSON'S 1906 CATALOGUE OF MICROSCOPES Send for List No. 6, post free on application.

(188 pages) post free on application. WATSON'S INSTRUMENTS MAY BE PURCHASED BY PROGRESSIVE PAYMENTS. W. WATSON & SONS, Opticians to H.M. Government, (Established 1837)

313 HIGH HOLBORN, LONDON, W.C. BRANCHES-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM.

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SPECTRUM TUBES. FLUORESCENT COMPOUNDS .

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Tubes containing
Calcium, Barium,
Strontium or Zinc

Sulphides, Cal-
Our Tubes are of our own manu. cium Salicylate,
facture, and have gained the Uranium Phos-
highest testimonials from spectro-

phate, Uranium

Ammonium Fluor. scopists.

ide, or Willemite. Made in the “H" and straight forms as shown.

PRICE, 4 - each. Argon or Helium tubes

15/- each.

PRICE of case conCadmium tubes...

10

taining 6 tubes as

illustrated, 25/Tubes containing Hydrogen, Oxygen, Water Vapour, Nitrogen,

each. Carbon Dioxide, Mercury, and Hydrogen and Mercury.

These tubes can be "H" form...

6/6 each.

worked from a 1" Straight form

5/

spark induction coil. A. C. COSSOR, 54 Farringdon Road, London, E.C. Awarded Golil and Silver Medals, St. Louis Exhibition, 1904.

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Telephone No. 10547 Central.

DALLMEYER'S NEW TELEPHOTO LENS.

LONDON

ADON

Can be used in front of any THE ADON CRECISTERED)

Mounted in Aluminium. small lens without disturbing

Measures 31 ins. long, if ins. plates or films which may be

diameter, weighs 4 ounces. in position.

9 H Dall mye??

PRICE, including Solid Leather Can be used alone for higher

Case, £3 10 0 nett. magnification or larger plates.

ILLUSTRATED BOOKLET with An excellent lens for all

Specimens of Work artistic photography.

PATENT.

FREE. J.H. DALLMEYER, LTD., 25 Newman St., London, W.

MAKERS OF THE CELEBRATED_DALLMEYER LENSES. Innicu by KICHARD ULAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground

Of Naturo trusts the mind which builds for aye.”— WORDSWORTH.
No. 1913, VOL. 74)
THURSDAY, JUNE 28, 1906

[PRICE 15 CENTS Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved. NEW PATTERN “NEWTONIAN” CHEAP

REYNOLDS & BRANSON, Ltd.,

Chemical and Scientific Instrument Makers to His Majesty's ELECTRIC LANTERN.

Government (Indian, Home, and Colonial). LABORATORY FURNISHERS and MANUFACTURING CHEMISTS.

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5067 New Iron-Body Lantern, with brass front, fitted on mahogany board, 4-in. double Condenser, best full-size achromatic Front Lens, and "Newtonian ” Hand-Feed Arc Lamp: CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied Complete in Case

£10 10s.

to National Physical Laboratory, Teddington, fitted for Gas, Water " & .,

and Electricity

Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200 OPTICIANS TO HIS MAJESTY THE KING

Illustrations, free on application. ANO HR.H. THE PRINCE OF WALES AND THE GOVERNMENT,

DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS. 3 FLEET STREET, LONDON.

14 COMMERCIAL STREET, LEEDS. NEGRETTI & ZAMBRA'S

THERMOMETER

MAGNIFIERS.

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When ordering state diameter of Thermometer.

JOHN J. GRIFFIN & SONS, Ltd.,

KINGSWAY, LONDON.

Illustrated Price List and full particulars post free on

application to NEGRETTI & ZAMBRA,

38 HOLBORN VIADUCT. Branches: 45 CORNHILL, and 122 REGENT STREET,

LONDON.

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