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WATKINS & DONCASTER,

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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, refei.
ences are permitted to distinguished patrons, Museums, Colleges, &c.
A LAROB STOCK OP INSECTS, BIRDS' EUGS AND SKINS.
SPECIALITY.-Objects for Nature Study, Drawing

Classes, &c.
Birds, Mammals, &c., Preserved and Mounted by Kirst-class

Workmen true to Nature.
All Books and Publications on Natural History suppllod.
36 STRAND, LONDON, W.C.

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

FLATTERS & GARNETT, Ltd.,

48 Deansgate,

Manchester. LABORATORIES-Church Road, Longsight, Manchester.

STORAGE CABINETS FOR LANTERN SLIDES, all sizes.

MINERALS.

Some Recent Additions to Stock.
From Cornwall : BOURNONITE, TETRAHEDRITE, PHARMACOSIDERITE,

SCORODITE, &c.
From Japan: FINE TOPAZ arid ORTHOCLASE CRYSTALS.

Specimens sont pour Selection.
Cabinets, Geologists' Hammers and Chisels, Glass-Capped
Boxes, Card Trays, Wood and Glass Models of Crystals, and
all Requisite Apparatus for Geologists and Mineralogists.

NEN' CATALOGUES POST FREE.
THOMAS D. RUSSELL, 78 Newgate Street, London, E.C.

SAVAGE CURIOSITIES.
ETHNOGRAPHICAL SPECIMENS.
Stock of over 10,000 Specimens of Weapons, Implements, Ornaments,
Dress, Idols, Musical instruments, &c., &c., used by all the Races of
Mankind, for sale at very low prices. All objects guaranteed genuine.
Trophies of genuine old Arms made for Billiard Rooms, Halls, &c.,
prices from 255. ; also mounted Horns.- Catalogue of Ethnographical
Specimens illustrated with Bromide Photographs, 4d. monthly, 3s. 6d.
yearly. Collections Arranged and Catalogued. Specimens bought.

W. 0. OLDMAN, 77 BRIXTON HILL, LONDON, S.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.

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 Develope ment, Anomalous Stems, Embryo-sac Structure, Pollen Tubes, Botrydium, (Edogonium, Coleochaete, Chara, Sexual Organs and Cystocarps in the Rhodophycea; Peronospora, Saccharomyces, Claviceps, Puccinia, Antho. ceros, Pilularia, Marsilea, Isoetes, Psilotum, Selaginella, Pinus, &c.

I Catalogne Post Free.
A. PENISTON, 5 MONTPELIER TERRACE, LEEDS.

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BIRKBECK BANK

ESTABLISHED 1851.
SOUTHAMPTON BUILDINGS, HIGH HOLBORN, W.C.

2 PER CENT. INTEREST

allowed on Deposit Accounts.
2 PER CENT. INTEREST

on Drawing Accounts with Cheque Book.

All general Banking Business transacted.
PROSPECTUS, witb full particulars. POST FREE.

C. F. RÁVENSCROFT, Secretary.

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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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."

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6 6 * The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payalıle to MACMILLAN & CO., Limited,

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THE GAIFFE AUTO-MOTOR

MERCURY JET INTERRUPTER

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(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. Runs 500 working hours without requiring attention.

See Nature, July 30, 1905, page 377. The leading experts have reported in terms of the highest praise upon this Break after continuous use (sine Testimonials

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

Descriptive Circular upon application.

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GLASS BLOWING SCIENTIFIC APPARATUS

to inventors' ideas, and promptly and correctly carried out for Scientific Men, Laboratories, 8c., PLACE SAME ON THE MARKET from rough drawing, or particulars.

upon favourable terms. ALL KINDS OF GLASS APPARATUS REPAIRED. ENQUIRIES ON SUCH MATTERS ARE INVITED.

A. C. COSSOR, 54 FARRINGDON ROAD, LONDON, E.C.

Awarded Gold and Silver Medals, St. Louis Exhibition, 1904.

Telephone : 10547 Central.

DALLMEYER'S NEW TELEPHOTO LENS.

LONDON
ADON
DANT

Can be used in front of any THE ADON (RECISTERED)

Mounted in Aluminium. small lens without disturbing

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

diameter, weighs 4 ounces. in position.

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

ILLUSTRATED BOOKLET with An excellent lens for all

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PATENT.

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

MAKERS OF THE CELEBRATED DALLMEYER LENSES. Prinicu by RICHARD LLAY AND SONS, LIMITED, at 7 ao breau Street Hill, Queen Victoria Street, in the City of London, and Duolished by MACMILLAS

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye. - WORDS WORTH.
No. 1925, VOL. 74] THURSDAY, SEPTEMBER 20, 1906 [PRICE 15 CENTS
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

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Special thin pattern, not exceeding } inch in thickness, for the vest pocket.

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Illustrated PRICE LIST

of this and other
Aneroid Barometers

free by post
on application to

When ordering state diameter of Thermometer.

JOHN J. GRIFFIN & SONS, Ltd., NEGRETTI & ZAMBRA,

38 HOLBORN VIADUCT, LONDON, E.C.

2IS. net.

1

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net.

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25.

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WATKINS & DONCASTER,

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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, refei.
ences are permitted to distinguished patrons, Museums, Colleges, &c
A LARGE STOCK OF INSECTS, BIRDS' EUGS 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 Publleations on Natural History supplied.
36 STRAND, LONDON, W.C.

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

FLATTERS & GARNETT, Ltd.,

48 Deansgate,

Manchester. LABORATORIES-Church Road, Longsight, Manchester.

STORAGE CABINETS FOR LANTERN SLIDES, all sizes.

MINERALS.

Some Recent Additions to Stock.
From Cornwall : BOURNONITE, TETRAHEDRITE, PHARMACOSIDERITE,

SCORODITE, &c.
from Japan: FINE TOPAZ and ORTHOCLASE CRYSTALS.

Sperimens sont por Salvation.
Cabinets, Geologists' Hammers and Chisels, Glass-Capped
Boxes, Card Trays, Wood and Glass Models of Crystals, and
all Requisite Apparatus for Geologists and Mineralogists,

NEW! CATALOGUES POST FREE.
THOMAS D. RUSSELL, 78 Newgate Street, London, E.C.

SAVAGE CURIOSITIES.
ETHNOGRAPHICAL SPECIMENS.
Stock of over 1,000 Specimens of Weapons, Implements, Ornaments,
Dress, Idols, Musical Instruments, &c., &c., used by all the Races of
Mankind, for sale at very low prices. All objects guaranteed genuine.
Trophies of genuine old Arms made for Billiard Rooms, Halls, &c.,
prices from 25$. ; also mounted Horns.- Catalogue of Ethnographical
Specimens illustrated with Bromide Photographs, ad. monthly, 35. 6d.
yearly. Collections Arranged and Catalogued. Specimens bought.

W. 0. OLDMAN, 77 BRIXTON HILL, LONDON, S.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.

LIVING SPECIMENS FOR

THE MICROSCOPE.

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,
Ulustrating Mirosis, Leucoplasts, Thyloses, Root, Stem, and Flower Develop
ment, 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.

Volvox, Spirogyra, Desmlds, Diatoms, Amcba, Arcella, Actinosbærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond' Life. Price is. per Tube, Post Free. Helix pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes.

THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM.

BIRKBECK BANK

ESTABLISHED 1851.
SOUTHAMPTON BUILDINGS, HIGH HOLBORN, W.C.
21 PER CENT. INTEREST

allowed on Deposit Accounts.
2 PER CENT. INTEREST

on Drawing Accounts with Cheque Book.

All general Banking Business transacted.
PROSPECTUS, with full particulars. POST FREE.

C. F. RAVENSCROFT, Secretary.

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, Ecbinus,
Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c.

For prices and more detailed lists apply to
Biological Laboratory, Plymouth.

THE DIRECTOR.

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Yearly
Half yearly
Quarterly

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.
E s. d. TO ALL PLACES AFROAD:- £ s. d.

E s. d.

6 s. d. * Three Lines in Column. Yearly 6

6 Quarter Page, or Half Per Line after.

a Column

I 15 Half-yearly 6 One Sixteenth Page, or Eighth Col. io

Half a Page, or a Column 3 5

One Eighth Page, or Quarter
0 7 6
Quarterly

Column
018 6 Whole Page

6 6 0
The first line being in heavy type is charged for as Two Lines.
Cheques and Money Orders payable to MACMILLAN EN CO., Limited,

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