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AMBRELL BROS.

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ON SALE:
Astronomical Telescope, with 4 in. clear aperture, altazimuth stand,
1 day and 4 astronomical eyepieces, price only £17 ; others cheaper. -
Microscopes, second-hand by Zeiss, with substage and Abbé condenser,
2 eyepieces, 2 objectives and triple nosepiece, for £9. Another by
PILLISCHER, with mechanical stage, substage-condenser and Iris-daphragm,
3 eyepieces, 3 objectives, viz. : 1", ", & 1" oil immersion, price only

£6' 10s. Another by Powell & LEALAND, with mechanical stage,
substage-condenser, and seven objectives all “P and L," offered for £10.
Binocular Microscope by Swift, cost £40, offered at £10. An-
other by STEWARD, with mechanical stage, 2 objectives, double nose piece,
&c., £6. Assay Balance by OERTLING, 6 in. beam, double columns,
sensitive to Yo milligram, double rider, ccst 625. offered at £6. Others
in Stock. 20 ft. Hydrogen Cylinder (charged), price £1. Scientific
Lantern Slides on every subject at 5d. each. Microscope Slides on
approval at 4d, each.

Rev. H. MILLS, Greenside, Kendal.

ELECTRICAL TESTING INSTRUMENTS.

DURHAM House, North SIDE, CLAPHAM COMMON, LONDON, S.W.

SCIENTIFIC WORTHIES.

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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.

SECOND-HAND
TELESCOPES, &c.-

6} in. ALVAN CLARK, equatorial, much apparatus $150
6 in. COOKE,

do.

£220 6 prism SPECTROSCOPE by BROWNING

£20 MICROSCOPES

POWELL & LEALAND, No. 3, much apparatus, £28 10s.
ZEISS IVa, ZEISS Vla

£14, £10
February List, including many others, all kinds, post frec.
C. BAKER, 244 HIGH HOLBORN, LONDON, W.C.

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With 30 Original Illustrations. Price 25. 6d.
The HYGIENE of the MOUTH.
A Guide to the Prevention and Oontrol of Dental Disea868.
By R. DENISON PEDLEY, L.D.S. Eng., F.R.C.S. Ed.,
Dental Surgeon to the Evelina Hospital, Southwark.

BY THE SAME AUTHOR.
The DISEASES OF CHILDREN'S TEETH

Well Illustrated. Price 75. 6d.
SEGG & CO., 289 and 291 Regent Street, Londor, W.

1905 ISSUE

NOW READY.

MACMILLAN & CO,'S NEW BOOKS.
THE STATESMAN'S YEAR-BOOK.

Statistical and Historical Annual of the States of the World for the Year 1905.
Edited by J. SCOTT KELTIE, LL.D., Secretary to the Royal Geographical Society.

CROWN 8vo.

10s. 6d. NET.

A MANUAL OF QUATERNIONS.

By CHARLES JASPER JOLY, M.A., D.Sc., F.R.S., Sec. R.I.A. ;
Fellow of Trinity College, Dublin ; Andrews' Professor of Astronomy in the University of Dublin, and Royal Astronomer of Ireland.

8vo. 109. net.

ELECTROMAGNETIC THEORY OF LIGHT.

By CHARLES EMERSON CURRY, Ph.D.

Part I. 8vo. 12s. net.

THE HISTORICAL RELATIONS OF MEDICINE AND SURGERY TO THE END

OF THE SIXTEENTH CENTURY. An Address delivered at the St. Louis Congress in 1901. By T. CLIFFORD
ALLBUTT, M.A., M.D., &c. Crown 8vo, 25. 6d. net.

MACMILLAN AND CO., LIMITED, LONDON.

RECENT & COMING ECLIPSES.

Sir NORMAN LOCKYER, K.C.B., F.R.S.

BY

Second Edition, containing an account of the Observations made at
Viziadrug, in India, in 1898, and of the conditions of the Eclipses

visible in 1900, 1901 and 1905. 8vo. 6s. net.

MACMILLAN AND CO., LIMITED, LONDON.

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WATKINS & DONCASTER,

PHENIX
ASSURANCE COMPANY, LIMITED.

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

ESTABLISHED 1782.
Moderato Rates. Absolute Security. Bloctric
Lighting Rules Supplied. Liberal Loss Settlements.

Prompt Payment of Claims.
LOSSBS PAID OVER £26,000,000.

BIR KBECK BANK

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 distinguisned 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.) Our Catalogue (96 pp.) Post free on application.

ESTABLISHED 1851.
Current Accounts. 2% Interest allowed on minimum

monthly balances when not drawn below £100.
Deposits. 21% Interest allowed on Deposit Accounts.
Advances made. Stocks and Shares bought and sold.
Apply C. F. RAVENSCROFT, Secretary,

Southampton Buildings, High Holborn, W.C.

ALBERT EDWARD JAMRACH

JAMRACH MICROLOCICAL LABORATORY AND SCHOOL OF NATURAL SCIENCE,

GRATIS AND POST FREE. (Late CHARLES JAMRACH),

Scientifically arranged Catalogue of Megascopic and Microscopic NATURALIST,

Specimens is now being prepared. Gentlemen are invited to send in their

applications without delay, as only 5000 copies will be issued. 180 ST. GEORGE STREET EAST.

Sample Slide of expertly prepared ROCK SECTIUN, 1/-, post free. Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery,

Metals, Minerals and Rocks expertly mounted for Microscope, Netsukis China, Lacquers, Gongs, Shells, and other Curios.

1/- each, from material supplied. LESSONS IN PRACTICAL LITHOLOGY BY CORRESPONDENCE.

A vacancy for one Geological Student, desirous of passing with high disROCKS, MINERALS, FOSSILS. tinction in University or Civil Service. Small preinium. Pocket-money

allowed. Apply:- The DIRECTOR, MICROLOGICAL LABORATORY, For Collectors, Students, Technical Schools, Colleges, &c.

I ASPENLEA ROAD, HAMMERSMITH, LONDON, W. 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/-. MINERALS, ROCKS, FOSSILS. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy.

A large stock of BRITISH AND FOREIGN MINERALS always on view A large stock of Minerals, Rocks, Fossils and Microscopic Objects for

CORNISH MINERALS selection. 'Specimens sent on approval.

A SPECIALITY.
Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped

Special display for Teachers and Students on Saturdays. Open till 7 p.m.
Boxes, Models of Crystals, &c., &c.
NEW CATALOGUE POST FREE.

RICHARDS' SHOW ROOMS,
THOMAS D. RUSSELL, 78 Newgate St., London, E.C.

3 Beauchamp Place, Brompton Road, South Kensington,

London, S.W.

MICROSCOPICAL PETROGRAPHY.

LIVING SPECIMENS FOR

THE MICROSCOPE.

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

MICROSCOPICAL PETROGRAPHY, now being issued in Twelve Monthly Parts, each Part containing Four Fine

Half Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 71-; Quarterly, 21/r for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.

Volvox, Spirogyra, Desmids, Diatoms, Amaba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price is. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes.

THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM.

TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN.
TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher
Local, thorough acquaintance with Modern Languages). Research,
Revision, Translation. Scale of charges on application. The Cam:
bridge Type-writing Agency, 10 Duke Street, Adelphi, W.C.

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.
opium; Hormipbora (preserved); Leptoplana; Lineus, Ampbiporus,
Nereis, AphroditeArenicola, Lanice, Terebella ; Lepas, Balanus
Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledono,
Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus,
Ascidia, Salpa (preserved), Scyllium, kala, &c., &c.

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

THE DIRECTOR.

For Sale.-Extensive Collections of British

Lepidoptera, Coleoptera, Tropical Butterflies, Cabinets, &c. Correctly nained type collections at very moderate prices.- Particulars from A. FORD, Hillside, Sunnyhill, Pokesdown, Bournemouth.

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NOTICE.-Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial
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6 6 • The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN EN CO., Limited.

OFFICE: ST. MARTIN'S STREET, LONDON, WC,

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NEW INCLINED PLANE,

designed by
W, J, WOODHOUSE,

25/

This Plane is made of polished mahogany, with brass supports and pegs to vary the angle of inclination.

The centre is cut away so that the force can To regulate PRESSURE & CURRENT, be applied parallel either to the base or plane. series or shunt, and a variety of The roller runs on glass tube, thus reducing other useful laboratory resistances. the friction to a minimum, and the plane can be Full particulars of above and other forms of ELECTRICAL MEASURING raised at right angles and used as an ordinary INSTRUMENTS for Laboratories, &c., are contained in New pulley, if desired.

Illustrated List, post free on application. ISENTHAL & CO.,

85 MORTIMER ST., LONDON, W. Contractors to the Admirally, IPar, India, Ev Colonial Offices, &%.

34 CAMOMILE STREET, E.C.

our

TOWNSON & MERCER,

C. E. MÜLLER, ORME & CO.'S NEW RESISTANCE GLASS

excels Jena Glass in its power to stand sudden variations of temperature. N.B. - The official test at the Charlottenburg Institute showed that with this glass the alkali dissolved by 100 C.C. of distilled water is to milligrammes as compared with 787 milligrammes dissolved from Jena glass under the same conditions.

IT IS AS CHEAP AS THE COMMON BOHEMIAN GLASS. May be had in BEAKERS (various forms), FLASKS (all shapes), TUBING (any size).

Price List fire on application to

,

C. E. MÜLLER, ORME & CO., Ltd. (CONTRACTORS TO).

148 HIGH HOLBORN, LONDON, W.C.

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Printed by RICHARD CLAY AND SONS, LIMITED), at 7 & & Bread Street Hill, Queen Victoria Street, in the City of London, and published by MARILLAS

AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MacmilLAN COMPANY, 66 Fifth Avenue, New York. – THURSDAY, April , 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.

No. 1852, VOL. 71)

THURSDAY, APRIL 27, 1905

[PRICE 15 CENTS

Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

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The "BIRDLAND R.M.S. "Danube,"

Rio de Janeiro,
CAMERA

Το

Nov. 7th, 1904. IN THE TROPICS.

Messrs. Sanders & Crowhurst,

London,
Gentlemen,

I have much pleasure in writing to inform you that my “Birdland ” Camera is proving a great success in the tropical heat of this country.

As you know I was feeling a little doubtful when I left England, as to how the camera would stand all the great climatic changes that it would have to pass through with me on my travels. However, it has come through with flying colours, and has not once failed me. Moreover it has enabled me to obtain a large number of

successful negatives that could BEST PATTERN. only have been gained with the BEST ...

aid of a reflex camera,

Your faithfully,
WORKMANSHIP. (Signed) F. MARTIN-DUNCAN,

Birdland Book let post free to readers of NATURE.
Sole Makers: SANDERS & CROWHURST, 71 Shaftesbury Avenue, London, W.

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NEGRETTI & ZAMBRA'S

"LONDON”

ANEROID BAROMETERS.

MICROSCOPE,

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With Eye-piece | inch, 1 inch
Object · glasses, in Mabogany

Case,
£5 12s. 6d.
Double Nose-piece, 9/- extra.
Focussing Substage, 14/6 extra.

RAIN

compensarea

The Watch Size Aneroid for foretelling weather and measuring heights.

27

21

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25

23

R. & J. BECK, Ltd.,

68 CORNHILL, LONDON.

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38 Holborn Viaduct,

E.C.
Branches-

45 Cornhill;
122 Regent Street,

8000

7000

OPTICAL CONVENTION, 1905.

...

President :
Dr. R. T. GLAZEBROOK, M.A., F.R.S.,

Director of the National Physical Laboratory.

Vice-Presidents:
SIR WM. DE WIVELESLIE ABNEY, K.C.B., D.C.L., F.R.S.

THE RIGHT Hon. THE LORD BLYTHSWOOD.
Sir W. H. M. CHRISTIE, K.C.B , M.A., F.R.S.,

Astronomer Royal.
The Right Hon. THE EARL OF CRAWFORD, K.T., LL.D., F.R.S.

MR. Thos. R. DALLMEYER, F.R.A.S.
The Hon. ALBAN G. H. Gibas, M.A., M.P.,

Master of the Worshipful Co. of Spectacle Makers.

Sir HOWARD GRUBB, F.R.S.
THE RIGHT HON. THE LORD KELVIN, O.M., G.C.V.O., F.R.S.
The Right Hon. THE I ORD RAYLEIGH, O.M., D.C.L., F.R.S.
THE Right Hon. The EARL OF Rosse, K.P., D.C.L., F.R.S.
TH
HE OPTICAL CONVENTION will be beld at the North

AMPTON INSTITUTE, CLERKENWELL, E.C., from May 31 to
June 3, inclusive.

The object of the Convention is to bring into co-operation those interested in Optical Matters, from all sides of the question, theorerical, practical, and commercial.

The mornings will be devoted 10 papers and discussions on Optical subjects. These will be collected in a volume to be issued by the Convention.

There will be an EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS of British manufacture, in the large ha!) of the Northampton Institute, during the Convention, open daily from 12 to 10 p.m. In connection with this, a catalogue is in preparation, which will be a useful work of reference in regard to instruments manufactured in this country.

The Subscription for Membership of the Convention will be five shillings. Applications for membership should be aodressed to the Hon. Sec., Mr. F. J. Selby, M.A., Elm Lodge, Ieddington, Middlesex, who will be glad to furr ish further particulars if desired. ADMISSION to the Exhibition, daily, ONE SHILLING,

after 7 p.m., Sixpence. Tickets admitting to the Exhibition at any time while it is open, 2/6.

BIRKBECK COLLEGE.
BREAMS BUILDINGS, CHANCERY LANE, E.C.
FACULTY OF SCIENCE.

DAY AND EVENING COURSES.
Chemistry

| J. E. MACKENZIE, Ph.D., DS
(H. WREN, Ph.D., B.A., B.Sc

(ALBERT GRIFFITHS. D.Sc. Physics ...

D. OWEN, B.A., B.Sc.

B. W. CLACK, B.Sc.
Mathematics

{ E. H. SMART, M.A.

*** 1 W. G. BIRT, B.A., B.Sc Botany

: ,

F. E. FRITSCH, Ph.D., B.Sc. Zoology ...

H. W. UNTHANK, B.A., B.Sc.
Geology & Mineralogy Geo. F. HARRIS, F.G.S.
Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.

RESEARCH in Chemistry and Physics in well-equipped laboratories
French, German, Spanish, Russian, Dutch, & Itallan Classes.

EVENING CLASSES also in Biology, Physiology, Practical Geometry
Building and Machine Construction, Steam, Tbeoretical and Appluc
Mechanics, Land and Quantity Surveying, and Estimating.

Calendar 6d. (post free 8d.), on application to the SECRETARY.
At the SOUTH-WESTERN POLYTECHNIC.

Manresa Road, Chelsea, ș.W., Day College Courses of thirty boer
per week are conducted in preparation for the London Universy
Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chen
try, Physics and the Natural Sciences. The composition fee for the
Session of three terms, 1904-1905, is 615. These Courses are re
nised for “Internal Students of the University, and consist of
lecture and laboratory instruction. The Courses are cooducted by -
MECHANICAI, ENGINEERING, W. W. F. Pullen, A. Mack'
Smith: ELECTRICAL ENGINEERING, A J. Makowe:
CHEMISTRY, J: B. Coleman, J. C. Crocker, and F. H. Lewe
MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lir
and L. Lownds; BOTANY, H. B. Lacey and T. G. H.
GEOLOGY, A. J. Maslen. In the evenings similar Courses will
conducted, but at £2 per Session. Also TECHNICAL D41
COURSES of three years' duration are arranged as a preparation lume
the Engineering, Electrical and Chemical and Metallurgical pe
lesions. The Laboratories and Workshop are open for RESEARCH
under the direction of The Principal and the Heads of Departments

Further particulars may be obtained on application to The SECRETARY, who will send either the Day College Prospectus an Calendar or the Evening Class Prospectus for itd. The Prospecta may be had at the Office for id. each.

ROYAL INSTITUTION OF

GREAT BRITAIN.

success.

B.A. AND B.Sc. EXAMS. ALBEMARLE STREET, PICCADILLY, W.

MATRICULATION, INTERMEDIATE, FINAL. MONDAY, May 1, at Five o'clock, Annual Meeting of the Members. PREPARATION by CORRESPONDENCE and ORAL TUITION

TUESDAY, May 2, at Five o'clock, Professor L. C. MALL, D.Sc., on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based o
F.R.S., first of Three Lectures on “ The Study of Extinct Animals.'
Half-a-Guinea the Course.

The STAFF includes Graduates of Oxford, Cambridge, London ar.
THURSDAY, May 4. at five o'clock, Prosessor Sir JAMES Dewar, Royal l'niversities, Science Medallists, Prizemen, Scholars, &c.
M.A., LL D., D.Sc., F.R.S., first of Three Lectures on

" Flame."

SINGLE SUBJECTS TAKEN: Science, Mathemancs, Lagu Half-a-guinea.

Psychology, Political Economy, Latin, Greek, French, German, &c SATURDAY, May 6, at Three o'clock, Professor MARSHALL Warn, For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oaus D.Sc., F.R.S., first of Two Lectures on "Moulds and Mouldiness." Burlington Correspondence College, Clapham Common, London, SW Half-a-Guinea. Subscription to all the Courses in the Season, Two Guineas.

UNIVERSITY OF BIRMINGHAM. FRIDAY EVENING, May 5, at Nine o'clock, Professor Henry E. ARMSTRONG, Ph.D., LL.D., F.R'S, on " Problems Underlying Nutrition.”

FACULTY OF SCIENCE.

PROFESSORSHIP OF CIVIL ENGINEERING. (UNDER THE AUSPICES OF His MAJESTY'S GOVERNMENT.) The Council of the University wish to elect a Professor of C

Engineering to co-operate with the Professors of Mechanical and Electric THE LONDON SCHOOL OF TROPICAL Engineering. He will have charge, with an assistant, of the teaches MEDICINE.

Surveying, Strength of Materials, Hydraulics, and other branches of Gino
Engineering; and will superintend ihe laboratories for Hydraulics

Strength of Materials.
(UNIVERSITY OF LONDON.)

The Stipend will be £600 a year. CONNAUGHT ROAD, ALBERT DOCK, E.

The Professor will be allowed to take Higher Cotsultative work, to keep

in touch with Civil Engineering practice, provided that it does not enterter (IN CONNECTION WITH THE HOSPITALS OF THE SEAmen's

with his University duties.

Applications, accompanied by seventy five copies of testimonials, sowe HOSPITAL SOCIETY.)

be received by the Secretary, not later than May 2o. The next SESSION commences on MONDAY, MAY 1, 1905.

The successful Candidate will be expected to begin bis dues :

October 2, 1905.
For Prospectus, Syllabus, and other particulars, apply to the Secretary, Further particulars may be obtained from
P. MICHELLI, Esq., Seamen's Hospital, Greenwich, S.E.

GEO. H. MORLEY, Secretary BACTERIOLOGY and PATHOLOGY.

UNIVERSITY OF LONDON KING'S COLLEGE, LONDON

WILLIAM LINDLEY STUDENTSHIP. A Research Students..?

Physiology of the value of £100 for one year, founded in memory of Director-R. T. HEWLETT, M.D., Professor of Bac'eriology. late William Lindley and tenable in the Physiological Laboratory o por Demonstrator of Bacteriology-H. S. WILLSON, M.B.

University, is now vacant. Applications, accompanied by a sammare The Laboratories are open daily from April 26 for instruction and research the carter of the applicant and the names of three persons to who rok*** in Pathology, Bacteriology, and Public Health,

may be made, will be received by the undersigned on or before sent Students may enter at any time.

May 8 next. A Course in Clinical Bacteriology suited to the requirements of senior

A. W. RUCKER, Pris "sa. students for the M.B. degrees will be held on Tuesdays and Thursdays University of London, South Kensington, S.W. during the summer session. Fee £5 55. For Syllabus apply to the SECRETARY or to Prof. HEWLETT,

for other Scholastic Advertisements, see page scals.

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