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ADAM HILGER, Ltd., 75a Camden Road, London, N.W.

AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.

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DENT'S CLOCKS,
WATCHES, AND CHRONOMETERS

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BUTLER'S

"SWINGCAM" STAND.

A SPECIALITY IN TRIPODS.

THE

FOR SCIENTIFIC USE.
Sidereal or Mean Time Clocks for
Observatories, £21 and upwards.

E. DENT & CO., Ltd.,
WATCH, CIOCK & CHRONOMETER MAKERS

By Special Appointment to H.M. the King.
MAKERS OF GREAT WESTMINSTER Clock,
BIG BEN. MAKERS OF THE STANDARD Clock OF
THE ROYAL OBSERVATORY,

GREENWICH, AND THE
PRINCIPAL OBSERVATORIES
THROUGHOUT THE WORLD.

Only Addresses-
61 STRAND, and 4 ROYAL EXCHANGE, LONDON.
YOUNG'S MODULUS APPARATUS

(Flexural Method). With Four Bars, £2:0:0. Scale 1.

TESTIMONIAL from Mr. R. KEARTON, F.Z.S.

Caterham Valley, Surrey, August 4th, 1960 Dear Mr. Butler,

I have much pleasure in stating that I have put your new "Swingcam
Camera Stand through a series of severe tests in Natural History Photo
graphy and found it an excellent contrivance for securing pictures under
every conceivable difficulty of situation. Bird-photographers will find it a
great boon.
Wishing it and those who use it all good luck.

I remain, Yours ever faithfully,
WM. BUTLER, Esq.

R KEARTON
WRITE FOR PAMPHLET AND PRESS COMMENTS

MARK

TRADE

DENT

WM. BUTLER, 20 Crosby Road, Southport.

(Late MOTTER8HEAD & CO.).

FREDK. JACKSON & Co.

14 CROSS STREET, MANCHESTER. LABORATORY FURNISHERS,

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Goods Entrance : 10 Half-Moon Street.

SCIENTIFIC WORTHIES.

A List of this Series of Steel and
Photogravure Portraits of Men of
Science will be sent post free to any
reader of “Nature” on application to

the Publishers.
ST. MARTIN'S STREET, LONDON, W.C.

Importers, Manufacturers, and Dealers in
CHEMICAL AND PHYSICAL APPARATUS

Of every Description.
FINE CHEMICALS, VOLUMETRIC SOLUTIONS,

PLAIN AND STOPPEREO 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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POST OFFICE BRIDGE SETS AND
DEAD BEAT GALYANOMETERS.
POTENTIOMETERS. STUDENTS'
SPECTROMETERS. SPHEROMETERS.

INDUCTION COILS A SPECIALITY.

ELECTROMETER, NEW PATTERN.
CHARING CROSS ROAD, LONDON,

56

W.C.

MACMILLAN & CO'S LIST, THE GEOLOGY OF SOUTH AFRICA.

By F. H. HATCH, Ph.D., M.Inst.C.E., President of the Geological Society of South Africa ; and G. S. CORSTORPHINÉ, B.Sc., Ph.D., Consulting Geologist to the Consolidated Coalfields of South Africa

8vo. 215. net. MINING WORLD._"The authors are to be congratulated on their success. . . . It deserves, and will no doubt have, a wide circulation."

NEW AND REVISED EDITION, NOW READY.

A TREATISE ON CHEMISTRY.

2IS. net.

By SIR H. E. ROSCOE, F.R.S., and C. SCHORLEMMER, F.R.S. Vol. I. — The Non-Metallic Elements. New Edition, completely revised by Sir H. E. Roscoe, assisted by Dr. H. G. COLMAN

and Dr. A. HARDEN. With 217 Illustrations. 8vo. ATHENA UM.-" It is almost superfluous to say that the work maintains its original high standard, and is p:e-eminent among works of its class in all languages.”

WATKINS & DONCASTER,

PHENIX
ASSURANCE COMPANY, LIMITED.

FIRE OFFICE.
19 LOMBARD ST., E.C., and 57 CHARING CROSS, S.W.

ESTABLISHED 1782.
Moderate Ratos. Absolute Security. Electric
Lighting Rules Supplied. Liberal Loss Settlements.

Prompt Payment of Olaims.
LOSSBS PAID OVER £28,000,000.

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, refei-
ences are permitted to distinguished patrons, Museumns, 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.) I New Catalogue (102 pp.) just issued, post free.

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GLASS BLOWING.

All kinds of Scientific and Experimental
Glass Blowing carried out on the Premises.

Any form of Glass Apparatus repaired.
Demonstrations given here, or at Colleges, &c.

Also Hand Painted from 1/3 to 5/- each.
Slides from Prints, Drawings, Photographs, &c., a Speciality.

PHOTOMICROGRAPHS.
Storage Cabinets for Lantern Slides to hold 400, 10/6;

600, 14/6; 1200, 25/6. See List. MICROSCOPICAL SLIDES, Botanical, Zoological,

1 &c., from 6s. per dozen. FLATTERS & GARNETT, Ltd.,

48, DEANSGATE, And at Church Road, LONGSIGHT, MANCHESTER.

H. HELM, 66 HATTON GARDEN, LONDON, E.C.

ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c.

COLLECTIONS IN POLISHED DEAL BOXES.

25 Specimens, 5/6 ; 50 do., 10/6 ; 100 do., 21/- ; 200 do., 42/Actual Maker of all kinds of X-Ray and Vacuum Tubes,

20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15%-. Mercury Pumps, High Frequency Electrodes, &c.

Adapted for the Board of Education Examinations in

Geology, Physiography, and Mineralogy.
A large stock of Minerals, Rocks, Fossils and Microscopic Objacts for

selection. Specimens sont on approval. LIVING SPECIMENS FOR Cabinets, Geologists' Hammers, Chisels, Card Trays, Qlass-capped

Boxes, Models of Crystals, &c., &c.
THE MICROSCOPE.

NEW CATALOGUE POST FREE. Volvox, Spirogyra, Desmids, Diatoms, Amceba, Arcella, Actinosphærium, THOMAS D. RUSSELL, 78 Newgate St., London, E.C. Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price is. per Tube, Post Free. Helis pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes MICROSCOPICAL PETROGRAPHY, THOMAS BOLTON,

Gentlemen interested in the above study are invited to send to 25 BALSALL HEATH ROAD, BIRMINGHAM.

JAMES R. GREGORY & CO., MARINE BIOLOGICAL ASSOCIATION

ı Kelso Place, Kensington Court, London, W., OF THE UNITED KINGDOM.

for a Prospectus of

THE TWENTIETH CENTURY ATLAS OF THE LABORATORY, PLYMOUTH.

MICROSCOPICAL PETROGRAPHY, The following animals can always be supplied, either living

now being issued in Twelve Monthly Parts, each Part containing Four Fine or preserved by the best methods :

Half-Tone Plates, and also Four actual Rock Sections. Sycon ; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, Alcy. oniun; Hormiphera (preserved); Leptoplana; Lineu«, `Ampbiporus,

Subscription in advance, either Monthly, 7/-; Quarterly, 21/.; Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s. Gammarus, Ligia Mysis, Nebalia, Carcinus ; Patella, Buccinum, Eledone, Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c.

PHOTOMICROGRAPHY for Publishers, For prices and more detailed lists apply to

Lecturers, Manufacturers, and general scientific research. Good work, Biological Laboratory, Plymouth.

THE DIRECTOR. moderate charges.-Saxby, 91 Penny Lane, Sefton Park, Liverpool.

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NOTICE.-Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial
Communications to the Editor. The telegraphic address of Nature is “ Puusis," LONDON.
SUBSCRIPTIONS TO "NATURE."

CHARGES FOR ADVERTISEMENTS.
£ s. d. TO ALL Places ABROAD:- 6 s. d.

£ s. d. Yearly

Yearly
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6 Quarter Page, or Half

Per Line after
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Half-yearly

I 15 0 15 6 One Sixteenth Page,or Eighth Col. 10 Quarterly

Quarterly o 7 6

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

OFFICE: ST. MARTIN'S STREET, LONDON, W.C.

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From the New Issue of W. WATSON & SONS' No. 3 CATALOGUE, just published. Post Free on application.

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Tsetse Flies (G. palpalis), whole insect

6 Perfume Glands on Leaf of Lavender ... Dissections of all parts may be had mounted separately. Also in

Bugula plumosa (Bird's Head coralline). Specially fine mounts 2 set of 12

£10

Karyokinesis in root of Water Lily ... "Send for Special Descriptive List.***

Leg of Flea, showing muscular structure Blood-sucking Maggot (from the Congo) ... .

Set of 16 Slides illustrating the development of an Ascidian Fly hatched from above, Auchmeromyii luteola

76

(Aspersa). In case ... ... ... Section of Brazilian Quartz, showing cavities containing fluid.

Trypanosorna Brucei (Tsetse Fly disease) Very interesting

Set of 5 Slides of the Garden Spider, showing different stages of Eggs of Emperor Moth, fertile and sterile, on 1 slide

growth. la Case ... ... ... ... ... ** SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS. WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists,

post free. W. WATSON & SONS, 313 High Holborn, London, W.C.

Branches-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM. CROSSLEY'S GAS ENGINES RECENTLY

GREAT REDUCTION REMODELLED. Represents K and L

CAS CONSUMED. types, giving 3.5 H.P.

Up to the end of 1904, and 5 H.P

over 51,000 gas and respectively.

oil engines had been ANCHESTES

delivered, representImmediate Delivery

ing about threefor Stock Sizes

quarters of a million of Engines.

actual horse-power. CROSSLEY BROS., LTD., OPENSHAW, MANCHESTER

DALLMEYER'S

IMPROVED

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Will not get out of Adjustment. Easy to Clean.
Easy to Handle. Lightest Glass Made.

Powers 4, 6, 8, 10, 12.

e Illustrated Pamphlet Post Free.
J. H. DALLMEYER, LTD.,

25 NEWMAN ST., LONDON, W.

Makers of the Celebrated Dallmeyer Lenses. junteu by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAS AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 66 Fifth Avenue, New York. -THURSDAY, Septemleri EN

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground

Oj Vature inusis the mind which builds for aye.IORDSWORTII. No. 1873, VOL. 72] THURSDAY, SEPTEMBER 21, 1905. [PRICE 15 CENTS Registered as a Newspaper at the General Post Office.)

All Rights are Reserved.

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Apparatus

for the determination of the relative

conductivity of thin layers of materials.

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NEGRETTI & ZAMBRA'S

LONG RANGE BAROMETERS THE DIAGONAL BAROMETER.-In this instrument the tube is much longer than usual, and at the point on the vertical column where in ordinary Mercurial Barometers the 23 inches would be marked, the tube is bent at an angle and the remaining 3 inches of the scale-viz. : 29, 30. and 31are extended over a tube 36 inches long.

The mercury now moving diagonally instead of vertically, travels over 12 inches of the tube to every inch on the vertical scale.

The slightest variation, even o1" to which the scale is divided, is at once noticeable ant can be easily read without the aid of a vernier or magnifier.

LEES' & CHORLTON'S

METHOD.

Catalogue of Part U.,
SOUND, LIGHT & HEAT,

free on application.

JOHN J. GRIFFIN & SONS, Ltd., 20-26 SARDINIA ST., LINCOLN'S INN FIELDS,

Further Particulars and prices of this and other long ringe Barometers sont on application to the Manufacturers.

NEGRETTI & ZAMBRA,

38 HOLBORN VIADUCT. BRANCHES : 45 CORNHILL, AND 122 REGENT STREET,

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