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WATKINS & DONCASTER,

THE NEW COLLECTION OF

336 SPECIMENS AND SLIDES OF ROCKS, CABINETS AND APPARATUS

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:

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Naturalists and Manufacturers of

according to H. ROSENBUSCH: “Elemente der FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

Gesteinslehre, 2d ed. 1901.”
BRANCHES OF NATURAL HISTORY

Accompanied by a text-book : "Practical Petrography," giving a short
SPECIAL SHOW-ROOM FOR CABINETS.

description of the polarizing microscope and its application, and also of the N.B.-For Excellence and Superiority of Cabinets and Apparatus, refer macroscopical and microscopical features of every specimen of this collec. ences are permitted to distinguished patrons, Museums, Colleges, &c.

tion, by Professor Dr. K. Busz of the University of Münster. This

collection is intended for the practical use of students, and contains typical A LAROE STOCK OF INSECTS, BIRDS' EGGS AND SKINS.

representatives of all important types of rocks; it is composed of 277 SPECIALITY.-Objects for Nature Study, Drawing

massive rocks (94 deep-seated rocks, so dike rocks, 133 volcanic rocks), Classes, &c.

28 sedimentary, and 31 crystalline schists. Out of it two smaller collections Birds, Mammals. &c., Preserved and Mounted by First-class

of 250 and 165 specimens have been elected. The prices are as follows :Workmen true to Nature.

Collection 1. 336 Specimens of Rocks ... 380 Marks. All Books and Publications on Natural History supplied.

la 336 Slides ... ... ... 420

, II. 250 Specimens of Rocks ... 270 36 STRAND, LONDON, W.C.

Ila. 250 Slides.

310
(Five Doors from Charing Cross.)
Is Nerr Catalogue (102 pp.) just issued, post free.

III. 165 Specimens of Rocks ... 170
Illa. 165 Slides ... ... ..

... ... 205 ALBERT EDWARD JAMRACH COLLECTIONS OF MINERALS, FOSSILS, METEORITES, (Late CHARLES JAMRACH),

PURCHASED FOR CASH OR EXCHANCED.
NATURALIST,

The fifth edition of Catalogue No. 4, Petrography, has just 180 ST. GEORGE STREET EAST.

been published (210 pages), and will be sent free of charge on

į application.
Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery,
Netsukis China, Lacquers, Gongs, Shells, and other Curios.

Dr. F. KRANTZ,
RHENISH MINERAL OFFICE, BONN-ON-RHINE, GERMANY.

ESTABLISHED 1833.
Gentlemen interested in the above study are invited to send to

JAMES R. GREGORY & CO., 1 Kelso Place, Kensington Court, London, W.,

for a Prospectus of
THE TWENTIETH CENTURY ATLAS OF

By E. L. N. ARMBRECHT.
MICROSCOPICAL PETROGRAPHY,

Symbols, Atomic Weight, Discoverer, Isolater, Specific Gravity, Principal

Source, Melting Point, Properties, Salts of, Price, &c. now being issued in Twelve Monthly Parts, each Part containing Four Fine Hall Tone Plates, and also Four actual Rock Sections.

ARMBRECHT, NELSON & CO.,

71 & 73 Duke Street, Grosvenor Square, W. Subscription in advance, either Monthly, 71-; Quarterly, 21).; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s. | N.B.-Sent Free on application.

MICROSCOPICAL PETROGRAPHY,

TABLE OF RARE ELEMENTS

LIVING SPECIMENS FOR

THE MICROSCOPE.

MINERALS, ROCKS, FOSSILS. A large stock of BRITISH AND FOREIGN MINERALS always on view

CORNISH MINERALS Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium,

A SPECIALITY. Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many Special display for Teachers and Students on Saturdays. Open till 7 p.m other specimens of Pond Life. Price is. per Tube, Post Free. Helix pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes.

RICHARDS' SHOW ROOMS,
THOMAS BOLTON.

3 Beauchamp Place, Brompton Road, South Kensington, 35 BALSALL HEATH ROAD, BIRMINGHAM.

London, S.W. MARINE BIOLOGICAL ASSOCIATION

ROCKS, MINERALS, FOSSILS.

For Collectors, Students, Technical Schools, Colleges, &c.
OF THE UNITED KINGDOM.

COLLECTIONS IN POLISHED DEAL BOXES.
THE LABORATORY, PLYMOUTH.

25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/- ; 200 do., 42/The following animals can always be supplied, eitber living

20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-.. or preserved by the best methods :

Adapted for the Board of Education Examinations in Sycon; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllla, Alcy.

Geology, Physiography, and Mineralogy. opium; Hormipbora (preserved); Leptoplana; Lineus, Amphiporus, 4 large stock of Minerals, Rocks, Fossils and Microscopic Objects for Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balados,

selection. Specimens sent on approval. Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Elodone, Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped Pecteas Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinos.

Boxes, Models of Crystals, &c., &c.
Ascidia, Salpa (preserved), Scyllium, Rala, &c., &c.

NEW CATALOGUE POST FREE.
For prices and more detailed lists apply to
Biological Laboratory, Plymouth.

THE DIRECTOR. | THOMAS D. RUSSELL, 78 Newgate St., London, E.C.

er Page, or has to s. d.

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

CHARGES FOR ADVERTISEMENTS.
& s. d. To all PLACES ABROAD:- & s. d.

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Column . . . . o 18 6 | Whole Page . . . 6 60 • The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN Con CO., Limited.

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

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The NEW RESONANCE APPARATUS

IS NOW ON VIEW,
Or Illustrated Descriptive Pamphlet may be had on application.
ISENTHAL & CO., 85 Mortimer St., London, W.

Contractors to the Admiralty. Il'ar, India, &- Colonial Offices, &C.

TOWNSON & MERCER,

34 CAMOMILE STREET, E.C.

C. E. MÜLLER, ORME & CO.,

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CONTRACTORS TO HIS MAJESTY'S GOVERNMENT,
148 HIGH HOLBORN, LONDON, W.C.

MANUFACTURERS OF APPARATUS FOR TEACHING CHEMISTRY, PHYSICS, MECHANICS,

HYDROSTATICS, &C. DEALERS IN PURE AND COMMERCIAL CHEMICALS. STUDENTS' SETS OF APPARATUS.

LISTS:-Chemical Apparatus-Chemicals-Balances- Assay-Thermometers-Electrical Apparatus-Focus Tubes,

X-Ray, and Wireless Telegraphy Apparatus-or SPECIAL WHOLESALE (for Quantities)-free on application,

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Printed by Richard CLAY AND 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, to bifth Avenue, New York.-THURSDAY, June 1, 1905

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye."-WORDSWORTH.

INDEX NUMBER.
No. 1858, Vol. 72]
THURSDAY, JUNE 8, 1905

[PRICE 30 CENTS Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

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COUNTY OF LONDON.

BIRKBECK COLLEGE
LONDON COUNTY COUNCIL PAD.
DINGTON TECHNICAL INSTITUTE. BREAMS BUILDINGS, CHANCERY LANE, E.C.

SUMMER COURSES OF LECTUR
Short Courses of Lectures in the undermentioned subjects will be given

FACULTY OF SCIENCE. at the L.C.C. Paddington Technical Institute, Saltram Crescent (near

DAY AND EVENING COURSES.
Westbourne Park Station), provided a sufficient number of students be
enrolled :
Gas and Oil Engines.

Chomlstry

SJ. E. MACKENZIE, Ph.D., D.S.. .

1. WREN, Ph.D., B.A., B.Sc. Practical Workshop.

ALBERT GRIPPITAS, D.Sc. The work of some great British Physicists.

Physics ...

D. OWEN, B.A., B.Sc.
Chemistry of Alkaloids.

(B. W. CLACK, B.Sc.
Mathematics.

Mathematics

SE. H. SMART, M.A.
Slide Rule.

*** (W. G. Birt, B.A., B.Sc.
House Sanitation.

(A. B. RENDLE, M.A., D.Sc. Land Surveying.

Botany ... ...

( F. E. FRITSCH, Ph.D., B.Sc. Experimental Mechanics for Building Trades.

Zoolosy ...

H. W. UNTHANK, B.A., B.Sc.
Railway Economics and Mechanics.

Geology & Mineralogy ... Geo. F. HARRIS, F.G.S.
Botany.

Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M.
Art.
A fee of 2s. will be charged, and this will admit students to all or any of RESEARCH in Chemistry and Physics in well-equipped laboratories.
the classes.
Full particulars as to the length of the courses, evenings and time of

French, German, Spanish, Russian, Dutch, & Italian Classes meeting of the classes, may be obtained on application to the SECRETARY

EVENING CLASSES also in Biology, Physiology, Practical Geometry, of the Institute.

Building and Machine Construction, Steam, Theoretical and Applied G. L. GOMME,

Mechanics, Land and Quantity Surveying, and Estimating. Education Offices,

Clerk of the London County Council. Victoria Embankment, W.C., June 1, 1905.

Calendar 6d. (post free 8d.), on application to the SECRETARY. METROPOLITAN WATER BOARD, UNIVERSITY OF BIRMINGHAM. DIRECTOR OF WATER EXAMINATIONS.

FACULTY OF SCIENCE. The Metropolitan Water Board are about to appoint on their permanent staff a Chief Officer who will be styled DIRECTOR OF WATER

RESEARCH SCHOLARSHIPS. EXAMINATIONS, and whose duties will be to advise the Board as to

Each of the value of about £96. the buildings, equipment and staff to be provided (under section 25 of the

(Founded by the late T. AUBREY Bowen, Esq., of Melbourne, Australia Metropolis Water Act, 1902), and subsequently to take charge and supervision thereof. The Director will also be required to give his whole time to

(a) Two BOWEN SCHOLARSHIPS in ENGINEERING. the work, and to superintend and be responsible to the Board for all examin.

(6) One BOWEN SCHOLARSHIP in METALLURGY. ations, analyses, experiments and reports, and to undertake such research (c) Three PRIESTLEY SCHOLARSHIPS in CHEMISTRY. work and chemical analyses and bacteriological investigations, whether of

The object of these Scholarships is to encourage higher work and researt water or otherwise, as may from time to time be required of him by the

in Scientific Professional Engineering and in Chemical and Metallurgica Board. The appointment will be held during the pleasure of the Board,

Science. Applications, supported by details of educational training, an and the salary will be £1000 per annum.

references to former teachers and others, should be sent to the REGIST* Applications for the appointment must be made in writing, and must state

| on or before June 19, 1995. The Scholarships will be tenable during te the age, qualifications, experience and present occupation of the applicants.

Session 1905-6. Official forms of application may be obtained from the undersigned, and

Further particulars may be obtained on application to the REGISTRAR. should be used if practicable. Applications must be enclosed in sealed envelopes endorsed “ Director"

UNIVERSITY OF CAMBRIDGE. and addressed to the undersigned; the last day for receiving them is Tuesday, July 11, 1905.

LONG VACATION COURSE, 1905. Canvassing members of the Board will be str rohibited and will be regarded as a disqualification.

PATHOLOGY, PUBLIC HEALTH AND PHARMACOLOGY. A. B. PILLING

This year the work of the Long Vacation Course will be divided int Savoy Court, Strand, W.C.,

Clerk of the Board. three sections: (1) (for D.P.H. Students) commencing on Monday May 31, 1905.

June 26, and (2) (lor Junior Students of Medicine) and (3) (for Advanced
Študents, Medical Men, Veterinary Surgeons, &c.) commencing *
Monday, July 3.

Any further information may be obtained from Mr. E. E. STUBBINS
Pathological Laboratory, Medical School, Cambridge.
Cambridge, May 19, 1905.

B.A. AND
The SECRETARYSHIP of this Society will be Vacant

MATRICULATION, INTERMEDIATE, FINAL on August 31. Salary, £200 per annum. The gentleman

PREPARATION by CORRESPONDENCE and ORAL TUITIO,

on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based holding the office would require to be willing to give his

success. whole time to its duties. Written applications, stating age, The STAFF includes Graduates of Oxford, Cambridge, London, a

Royal Universities, Science Medallists, Prizemen, Scholars, &c. qualifications, references, &c., should be addressed to “The SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic

Psychology, Political Economy, Latin, Greek, French, German, &c. HONORARY SECRETARIES, GEOGRAPHICAL SOCIETY, I Queen For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oron Street, Edinburgh,” not later than June 26, 1905.

Burlington Correspondence College, Clapham Common, London, S.W. It is particularly requested that there be no canvassing of

NORTHAMPTON INSTITUTE, Members of Council.

ST. JOHN STREET ROAD, LONDON, E.C.
The Governing Body invite applications for the following vacant appoior

ments :
BIRKBECK COLLEGE.

MECHANICAL ENGINEERING DEPARTMENT. The Council invite applications for the appointment of ASSISTANT DRAWING OFFICE and LECTURE ASSISTANT, full time LECTURER IN MATHEMATICS. Commencing Salary £175, to date Salary, 120 per annum. from September I next. Applications, stating age, degrees and qualifica. PATTERN MAKER and INSTRUCTOR in PATTERN MAKING tions, teaching experience, and enclosing testimonials, must reach the full time. Salary, 6120 per annum. PRINCIPAL not later than Tuesday, June 20.

JUNIOR DRAWING OFFICE INSTRUCTOR, full time. Saları Birkbeck College,

(100 per annum. Breams Buildings, Chancery Lane, E.C.

LABORATORY DEMONSTRATOR for the Engineering Laboratories

full time. TO SCIENCE AND MATHEMATICAL JUNIOR TECHNICAL ASSISTANT, full time. MASTERS.-Required (1) For Technical School, Special Subjects,

EVENING INSTRUCTOR in AUTOMOBILE WORK. two even. Electro Technics and Electricity, £160 to $200. (2) Chemistry,

ings per week. Physics, Mechanics, and Maths. C120, resident, or the post might be

ELECTRICAL ENGINEERING DEPARTMENT. non-resident. School in Ireland." (3) Well-qualified Master to teach JUNIOR TECHNICAL ASSISTANT, full time. Electricity, must have had experience in the organisation of the JUNIOR LECTURE ASSISTANT, full time. work of a Local Technical Instruction Committee, 6150 to £200.

Further particulars of any of the above, with forms of application, what (1) Graduate, or A.R.C.S. for Chemistry, Physics, and Mechanics,

should be returned not later than 10 a.m. on Thursday, June 29, 160s, car. C100, resident. Endowed Grammar School. (5) Maths., Chemistry,

be obtained on application by letter to and Physics, £120. County School. For particulars of the above and

R. MULLINEUX WALMSLEY, D.Sc., Principal many other vacancies, address GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. over 70 years), 34 Bedford Street, Strand,

For other Scholastic Advertisements, see page lii. London,

ROYAL SCOTTISH GEOGRAPHICAL SOCIETY.

B.Sc. EXAMS.

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table

W. WILSON. STUDENT'S SPECTROMETER.

Telescope and prism table reading to I min.; clamp and fine adjustment to both. Rack-motion to tele. scope; prism table adjustable vertically and horizontally. Ad. justable slit to colli. mator. Protected

circle. In case.
Price ... ... £6 0 0
A very large number of these instruments have been sold,

and have given exceptional satisfaction.
The Resonance Tube is 3 ft. |
long, with a graduated scale

ale 1 BELMONT STREET, LONDON, N.W.
fixed at the side. The sliding
reservoir moves easily in a

Accurate and grooved frame, so that the water

Inexpensive.
level can be quickly altered.
Price, in Polished Mahogany
Stand, 24/-

PRICE

DR. H. STROUD'S

Apparatus for
DETERMINING THE

VELOCITY OF
SOUND IN AIR, BY

THE METHOD
OF RESONANCE.

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SOLE MAKERS

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BRADY & MARTIN, LTD.,

Scientific Apparatus Makers, NEWCASTLE - UPON - TYNE.

THE NEW PATENT

PIESMIC BAROMETER.

Makers and Dealers in all kinds of Chemical and Physical Descriptive

To be obtained of all Opticians, or Apparatus for Schools and Colleges, Works' Laboratories Pamphlet

the SOLE MAKERS, and Special Research Work.

Post Free.

F. DARTON & CO., CONSTRUCTION OF NEW FORMS OF APPARATUS

CLERKENWELL OPTICAL WORKS, UNDERTAKEN.

| 142 ST. JOHN STREET, LONDON, E.C.

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