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THE NEW COLLECTION OF

WATKINS & DONCASTER,

· 336 SPECIMENS AND SLIDES OF ROCKS,

205

Naturalists and Manufacturers of CABINETS AND APPARATUS

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

Gesteinslehre, 2d ed. 1901.”
BRANCHES OF NATURAL HISTORY
SPECIAL SHOW-ROOM FOR CABINETS.

Accompanied by a text-book : “Practical Petrography," giving a short

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 uf Münster. This

collection is intended for the practical use of students, and contains typical A LARGE 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, 50 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 selected. 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 36 STRAND, LONDON, W.C.

II. 250 Specimens of Rocks ... 270
lla, 250 Slides ... ..

310
(Five Doors from Charing Cross.)

III. 165 Specimens of Rocks ... 170 IG Yere Catalogue (102 pp.) just issued, post free.

Illa. 165 Slides ... ... ... ALBERT EDWARD JAMRACH

cu 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

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., i 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 Half-Tone Plates, and also Four actual Rock Sections.

ARMBRECHT, NELSON & CO., Subscription in advance, either Monthly, 71-; Quarterly, 21/- ;

71 & 73 Duke Street, Grosvenor Square, W. or for the whole Series of 12 Monthly Parts & 48 Sections, 44 4s. N.B.-Sent Free on application.

MICROSCOPICAL PETROGRAPHY.

TABLE OF RARE ELEMENTS.

LIVING SPECIMENS FOR

THE MICROSCOPE.

Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many ocher 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.

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

A SPECIALITY.
Special display for Teachers and Students on Saturdays. Open till 7 p.m

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

London, S.W.

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.
anium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus,
Nereis, Aphrodite, Arenicola, Lanice, Terebella ; Lepas, Balanas,
Grammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Elodonc,
Pectens Bagala, Crisia, Pedicellina, Holothuria, Asterias,' Echinus.
Assidia, Salpa (preserved), Scyllium, Rala, &c., &c.
For prices and more detailed lists apply to
Ecological Laboratory, Plymouth.

THE DIRECTOR.

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/

20 Coal Measure Rocks and Fossils, 12/6 ; do., larger, 15/-. Adapted for the Board of Education Examinations in

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

selection. Specimens sent on approval.
| Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped

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

NEW CATALOGUE POST FREE. 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.
ks. d. TO ALL Places ABROAD:- 6 s. d.!

6 s. d.

6 s. d. Yearly . . . . 1 80 Yearly .

*Three Lines in Column

Quarter Page, or Hall

Per Line after . Hallgearly

..

ooola Column . 14 61

. 1150 Half yearly · · · 0 15 6 One Sixteenth Page,or Eighth Col. 10 | Half a Page, or a Column 3 5 3 Yearterly . . . 7 61 Quarterly . . .0 8 o One Eighth Page, or Quarter

Column . . . . . 18 6 | Whole Page. . 66 • The first line being in beavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN EN CO., Limited.

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

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C. E. MÜLLER, ORME & CO.,

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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, co Fifth 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.”—WORDS WORTH.

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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MICROSCOPE,

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NEW ILLUSTRATED AND
REVISED PRICE LISTS

Free by Post.

2000

CHANGE

ST 29

FAIR

RAIN

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compenserled

The Watch Size Aneroid for foretelling weather and measuring heights.

Double Nose-piece, 9/- extra.
Focussing Substage, 14/6 extra.

4000

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9000 !

R. & J. BECK, Ltd.,

68 CORNHILL, LONDON.

24 LEX

UTIE

6 000

Holborn Viaduct,

E.C. Branches

200

TITUTI

45 Cornhill;
122 Regent Street.

INTRO

8000

70'0o

WILD

COUNTY OF LONDON.

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

SUMMER COURSES OF LECTURES.
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 :

J. E. MACKENZIE, Ph.D., D.Sc.

Chomistry
Gas and Oil Engines.

*** TH. WREN, Ph.D., B.A., B.Sc. Practical Workshop.

(ALBERT GRIYPITHS, 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.

(E. H. SMART, M.A.
Slide Rule.

Mathematics

*** 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.

Zoology ...

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

Qeology & 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.

French, German, Spanish, Russlan, Dutch, & Itallan Classes. Full particulars as to the length of the courses, evenings and time of 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, Tbeoretical and Applied
G. L. GOMME,

Mechanics, Land and Quantity Surveying, and Estimating.
Education Offices,
Clerk of the London County Council.

Calendar 6d. (post free 8d.), on application to the SECRETARY.
Victoria Embankment, W.C., June 1, 1905.
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 super.

(a) Two BOWEN SCHOLARSHIPS in ENGINEERING. vision thereof. The Director will also be required to give his whole time to 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 research water or otherwise, as may from time to time be required of him by the

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

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

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

on or before June 19, 1995. The Scholarships will be tenable during the 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 strictly prohibited 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 into 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
Students, Medical Men, Veterinary Surgeons, &c.) commencing on
Monday, July 3.

Any further information may be obtained from Mr. E. E. STUBBINGS,

Pathological Laboratory, Medical School, Cambridge. GEOGRAPHICAL SOCIETY. Cambridge, May 19, 1905.

ROYAL SCOTTISH

B.A. AND B.Sc. EXAMS.

The SECRETARYSHIP of this Society will be Vacant on August 31. Salary, £200 per annum. The gentleman holding the office would require to be willing to give his whole time to its duties. Written applications, stating age, qualifications, references, &c., should be addressed to “The HONORARY SECRETARIES, GEOGRAPHICAL SOCIETY, I Queen Street, Edinburgh,” not later than June 26, 1905.

It is particularly requested that there be no canvassing of Members of Council.

BIRKBECK COLLEGE.
The Council invite applications for the appointment of ASSIS

ons for the appointment of ASSISTANT
LECTURER IN MATHEMATICS. Commencing Salary 6175, to date
from September I next. Applications, stating age, degrees and qualifica.
tions, teaching experience, and enclosing testimonials, must reach the
Principal not later than Tuesday, June 20.
Birkbeck College,

Breams Buildings, Chancery Lane, E.C.
TO SCIENCE AND MATHEMATICAL

MASTERS.-Required @ For Technical School. Special Subjects.
Electro Technics and Electricity, 4160 to £200. (2) Chemistry,
Physics, Mechanics, and Maths., £120, resident, or the post might be
non-resident School in Ireland. (3) Well.qualified Master to teach
Electricity, must have had experience in the organisation of the
work of a Local Technical Instruction Committee, 6150 to £200.
(4) Graduate, or A.R.C.S. for Chemistry, Physics, and Mechanics,
£100, resident. Endowed Grammar School (5) Maths., Chemistry,
and Physics, 6120. County School. For particulars of the above and
many other vacancies, address GRIFFITHS, SMITH, POWELL & SMITH,
Tutorial Agents (Estd. over 70 years), 34 Bedford Street, Strand,
London.

MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE and ORAL TUITION on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based on success.

The STAFF includes Graduates of Oxford, Cambridge, London, and Royal Universities, Science Medallists, Prizemen, Scholars, &c.

SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, Psychology, Political Economy, Latin, Greek, French, German, &c.

For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond, and Oxon.),
Burlington Correspondence College, Clapham Common, London, S.W.

NORTHAMPTON INSTITUTE,
ST. JOHN STREET ROAD, LONDON, E.C.
The Governing Body invite applications for the following vacant appoint-
ments:-

MECHANICAL ENGINEERING DEPARTMENT.
DRAWING OFFICE and LECTURE ASSISTANT, full time.
Salary, 6120 per annum.

PATTERN MAKER and INSTRUCTOR in PATTERN MAKING full time. Salary, £120 per annum.

JUNIOR DRAWING OFFICE INSTRUCTOR, full time. Salary, 6100 per annum.

LABORATORY DEMONSTRATOR for the Engineering Laboratories, full time.

JUNIOR TECHNICAL ASSISTANT, full time. EVENING INSTRUCTOR in AUTOMOBILE WORK. two evenings per week.

ELECTRICAL ENGINEERING DEPARTMENT. JUNIOR TECHNICAL ASSISTANT. full time. JUNIOR LECTURE ASSISTANT, full time. Further particulars of any of the above, with forms of application, which should be returned not later than 10 a.m. on Thursday, June 29, 1905, can be obtained on application by letter to

R. MULLINEUX WALMSLEY, D.Sc., Principal. For other Scholastic Advertisements, see page lis.

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W. WILSON. STUDENT'S SPECTROMETER.

DR. H. STROUD'S

Apparatus for
DETERMINING THE

VELOCITY OF
SOUND IN AIR, BY

THE METHOD
OF RESONANCE.

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Telescope and prism
G 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 31:11 BELMONT STREET. LONDON, N.W. long, with a graduated scale 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

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SOLE MAKERS

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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.

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

Post Free.

CLERKENWELL OPTICAL WORKS, UNDERTAKEN.

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

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