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BIRK BECK BANK

PHOENIX
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 L088 Settlements.

Prompt Payment of Olaims.
LOSSES PAID OVBR £86,000,000.

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

monthly balances when not drawn below £100.
Deposits. 21% Interest allowed on Deposit Accounts.
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Apply C. F. RAVENSCROFT, Secretary,

Southampton Buildings, High Holborn, W.C.

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.

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LANDSCAPE IN HISTORY & OTHER ESSAYS.

By Sir ARCHIBALD GEIKIE, D.C.L., F.R.S.

8vo. 8s, 6d, net. ATHENÆUM.-"Whilst Sir Archibald's wide experience in the field as a professional geologist has led to his intimate acquaintance with British scenery in every phase, his constant use of the hammer has in no way lessened the power of his pen, and the volume of essays under review, like his former collection of 'Sketches,' forms a charming contribution to the literature of his favourite science."

TWENTY-SIX GRADUATED EXERCISES IN CRAPHIC STATICS,

some in Two Colours, and with Skeleton Data to practise upon, and including the Application to Roofs, Moving Locomotives, Retaining Walls, Lévy's Steel Arches, Girders (Original Constructions), Masonry Arches, 'Lévy's Weight Tables, with an Essay on Graphical Statics, in the form of a Running Commentary on the Exercises, each of which has full Instructions printed on its face, the

whole forming a Supplement to the Authors' Elementary Applied Mechanics. By T. ALEXANDER, M.Inst.C.E.I., Professor of Engineering, Trinity College, Dublin ; and A. W. THOMSON, D.Sc., C.E., Professor of Engineering, College of Science, Poona.

FCAP. BROADSIDE. SEWED. 10s.

MAY NUMBER JUST PUBLISHED.
T H E SC H O OL W ORL D.

A MONTHLY MAGAZINE OF EDUCATIONAL WORK AND PROGRESS.
SixPENCE MONTHLY. YEARLY VOLUME, 75. 60. NET.

PRINCIPAL CONTENTS.
School Cadet Corps. I. By Edward C. Goldberg, M.A., Capt. Ist Middlesex R.E.(V.). --The Incidental Teaching of
English Language. By Norman L. Frazer, B.A. - Practical Science Instruction in Irish National Schools.
From an Irish Correspondent. -The Biological Side of Nature-Study. II. Animal Lise. By Oswald H Latter, M.A.
-Studies in School Management. IV. Correction of Exercises. By J. W. Jarvis.–Foundations of Educational
Science. By Prof. J. J. Findlay.--Secondary Schools and the Universities. IV. The University of Birmingham.
-Cambridge Local Examinations, 1904. Hints for Teachers from the Examiners' Reports. Some Recent Wall Maps. The
Teacher's Part in the New Education. By J. H. Badley, M.A.-Correspondence : The Heuristio Method of Teaching
Science. By Examiner.-Individual Attention. By Robert L. Leighton, M.A.—The Education of Intending Pupil Teachers.
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Education Committees. By S. J. G.

MACMILLAN AND CO., LIMITED, LONDON.

RECENT & COMING ECLIPSES.

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

WATKINS & DONCASTER, ,

THE NEW COLLECTION OF

336 SPECIMENS AND SLIDES OF ROCKS,

Naturalists and Manufacturers of
CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

BRANCHES OF NATURAL HISTORY.
SPECIAL SHOW-ROOM FOR CABINETS.
NR-For Excellence and Superiority of Cabinets and Apparatus, refer.
exces 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 Publications on Natural History supplied.
36 STRAND, LONDON, W.C.

(Five Doors from Charing Cross.) Our Catalogue (96 pp.) Post free on application.

according to H. ROSENBUSCH: “ Elemente der

Gesteinslehre, 2d ed. 1901.” Accompanied by a text-book : "Practical Petrography,” giving a short description of the polarizing microscope and its application, and also of the macroscopical and microscopical features of every specimen of this collec. tion, by Professor Dr. K. Busz of the University of Münster. This collection is intended for the practical use of students, and contains typical representatives of all important types of rocks; it is composed of 277 masive rocks (94 deep-seated rocks, 50 dike rocks, 133 volcanic rocks), 28 sedimentary, and 31 crystalline schists. Out of it two smaller collections of 250 and 165 specimens have been selected. The prices are as follows :Collection I. 336 Specimens of Rocks 380 Marks. la. 336 Slides

420 IT.

250 Specimens of Rocks 270 lla. 250 Slides ..

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

205 COLLECTIONS OF MINERALS, FOSSILS, METEORITES,

PURCHASED FOR CASH OR EXCHANCED, The fifth edition of Catalogue No. 4, Petrography, has just been published (210 pages), and will be sent tree of charge on application.

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

COLLECTIONS IN POLISHED DEAL BUXES.
* Specimens, 5/6; 50 do., 10/6 ; 100 do., 21/-; 200 do., 42/-

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

Geology, Physiography, and Mineralogy.
A large stace of Minerais, Rocks, Fossils and Microscopic Objects for

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

Boxas, Model Crystals, &c., &c.

NEW CATALOGUE POST FREE
THOMAS D. RUSSELL, 78 Newgate St., London, E.C.

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

ESTABLISHED 1833.

MICROLOGICAL LABORATORY AND SCHOOL OF NATURAL SCIENCE.

GRATIS AND POST FREE.
Scientifically arranged Catalogue of Megascopic and Microscopic
Specimens is now being prepared. Gentlemen are invited to send in their
applications without delay, as only 5000 copies will be issued.
Sample Slide of expertly prepared ROCK SECTION, 1/-, post free.
Metals, Minerals and Rocks expertly mounted for Microscope,

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

A vacancy for one Geological Student, desirous of passing with high dis. tinction in Universiiy or Civil Service. Small premium. Pocket-money allowed. Apply :- THE DIRECTOR, MICROLOGICAL LABORATORY,

1 ASPENLEA ROAD, HAMMERSMITH, LONDON W.

MICROSCOPICAL PETROGRAPHY, 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

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

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

(Late CHARLES JAMRACH),

NATURALIST, 180 ST. GEORGE STREET EAST. implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery,

Netsakis China, Lacquers, Gongs, Shells, and other Curios.

LIVING SPECIMENS FOR

THE MICROSCOPE. Volvox, Spirogyra, Desmids, Diatoms, Ameba, 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. 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, Caryopbyllla, Alcy.
opium; Hormiphora (preserved); Leptoplana; Lineus, Ampbiporus,
Nereis, Apbrodite, Arenicola, Lanice, Terebella ; Lepas, Baladus,
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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OFFICE: ST. MARTIN'S STREET, LONDON, WC.

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Full Particu'ars of above and other forms of ELECTRICAL MEASURING
INSTRUMENTS for Laboratories, &c., are contained in our New

Illustrated List, post free on application.

TOWNSON & MERCER, ISENTHAL & co., 85 Mortimer St., London, W.

34 CAMOMILE STREET, E.C. C. E. MÜLLER, ORME

ORME & CO.'S

Contractors to the Admiralty, Har, India, & Colonial Offices, &*c.

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 jód, milligrammes as compared with ndio 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 free on application to

C. E. MULLER, ORME & CO., Ltd. (H.M.TROVERNMENT),

148 HIGH HOLBORN, LONDON, W.C.

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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 Maculd

AND Co., LIMITED, at St. Martin's Street, London, W.C., and THE MACAUILLAN COMPANY, 66 Fifeh Avenue, New York: - THURSDAY, May 4, 1305

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1905

MAY

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

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

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ANEROID
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Containing an original description of the principles and fenction of the photographic lens. Together with the

latest workshop methods. Then there follows a series of chapters on practical photography and the effect of lenses on results. The chief types are discussed and compared by means of original diagrams. Also an appendix on the Gauss Theory and on a new system of lens testing. The book

is entitled
"PHOTOGRAPHIC LENSES:

A SIMPLE TREATISE."
By CONRAD BECK and HERBERT ANDREWS.

POST FREE 1/3
350 Pages, 45 Engravings, 150 Diagrams, Cloth Bound.

EDITION DE LUXE, 3/6 POST FREE.
R. & J. BECK, Ltd., 68 CORNHILL, LONDON.

Compensutd

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23

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38
Holborn Viaduct,

E.C
Branches-

6000

45 Cornhill ;

7000

8000

OPTICAL CONVENTION, 1905. BIRKBECK COLLEGE

...

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.RS.

MR. Thos. R. DALLMEYER, F.R.A.S.
The Hon. ALBAN G. H. GIBBS, 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 LORD RAYI EIGH, O.M., D.C.L., F.R.S. The Right Hon. The EARL OF Rosse, K.P., D.C.L., F.R.S. THI 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, theoretical, practical, and commercial.

The mornings will be devoted to 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!l 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, Teddington, Middlesex, who will be glad to furnish 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.

BREAM BUILDINGS, CHANCERY LANE, E.C. FACULTY OF SCIENCE.

DAY AND EVENING COURSES. Chemistry

SJ. E. MACKENZIE, Ph.D., D.Sc (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.

W. G. Birt, B.A., B.Sc. Botany

A. B. RENDLE, M.A., D.Sc.

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

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

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

EVENING CLASSES also in Biology, Physiology, Practical Geometry. Building and Machine Construction, Steam, Tbeoretical and Applied 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, S.W., Day College Courses of thirty hours per week are conducted in preparation for the London University Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemistry, Physics and the Natural Sciences. The composition fee for the Session of three terms, 1904-1905, is £15. These Courses are recog. nised for “ Internal Students of the University, and consist of lecture and laboratory instruction. The Courses are conducted by:MECHANICAL ENGINEERING, W. W. F. Pullen, A. Macklow Smith; ELECTRICAL ENGINEERING,

A J.

Makower; CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe; MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister and L. Lownds; BOTANY, H. B. Lacey and T. G. Hill; GEOLOGY, A. J. Maslen. In the evenings similar Courses will be conducted, but at £2 per Session. Also TECHNICAL DAY COURSES of three years' duration are arranged as a preparation for the Engineering, Electrical and Chemical and Metallurgical professions. The Laboratories and Workshop are open for REŠEARCH 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 and Calendar or the Evening Class Prospectus for 3d. The Prospectuses may be had at the Office for id. each,

ROYAL GEOGRAPHICAL SOCIETY. The ANNIVERSARY MEETING of the Society for the ELECTION of PRESIDENT and COUNCIL, &c., will be held in the THEATRE, BURLINGTON GARDENS, on Monday, May 22, at 3 p.m., the PRESIDENT in the Chair.

In place of the Annual Dinner of the Society a BANQUET in honour of the retiring President, Sir Clements R. Markham, K.C.B., will be held on the Evening of the Anniversary Meeting, May 22, at the Hotel Metropole, Whitehall Rooms, Whitehall Place, at 7.0 p.m. for 7.30. Dinner charge. klus. Friends of Fellows are admissible to the dinner as far as space will permit. Applications for tickets should be made to the Chief Clerk, i Savile Row, Burlington Gardens, W.

LEONARD DARWIN, Secretaries.

J. F. HUGHES, Savile Row, Burlington Gardens, W.

HIGHER MATHEMATICS FOR SCIENCE AND OTHER STUDENTS. Correspondence Tuition by highly qualified graduates of

Oxford, Cambridge, London and Royal Universities, in Algebra, Trigonometry, Theoretical Mechanics, Difier. ential and Integral Calculus, Pure Geometry, Geometrical Drawing. &c.

Departments are at work preparing for London and Royal University Examinations, Science and Art, Civil Service Examinations, and all Pror. Preliminaries ---Apply to Mr. J. CHARLESTON, B.A., Burlington Corre spondence College, Clapham Common, London, S.W.

THE AGENT-GENERAL for the CAPE

OF GOOD HOPE has been instructed to receive applications for the vacant post of PROFESSOR OF ZOOLOGY to the SOUTH

AFRICAN COLLEGE, CAPE TOWN, up to June 1 next, Candidates must be under 35 years of age, and their applications should

be supported by copies of testimonials and a medical certificate. The salary offered is 6500 per annum on appointment, £600 per annum

after three years' service, £700 per annum after ten years' service, together with a merit grant of 675 per annum after five years, increasing to £100 after ten years. An allowance of £50 will be made to cover the cost of the journey to the

Colony. The accepted Candidate is to assume duty in Cape Town during the first

week in July, or so soon thereafter as possible. 100 Victoria Street, London, S.W.,

May 2, 1905.

BATTERSEA POLYTECHNIC,

BATTERSEA PARK ROAD, S.W. Principal-SIDNEY H. WELLS, Wh.Sc., A.M.I.C.E., A.M.I.M.E.

A special SUMMER COURSE of Eight Lectures, followed by Laboratory Work in GAS ANALYSIS, will be held by Mr. J. WILSON, M.Sc. (Head of Chemical Department), on Wednesday Evenings, commencing May 17.

Lecture. 7.15 to 8.15. Lab., 8.15 to 9.45. Fee, 5s.
For other special courses for Int. and Final B.Sc., see prospectus,

The “N” Fellowship, tenable at Cambridge

and open to former science students of Newnham and Girton Colleges, will be vacant in the autumn. The holder is required to conduct original research in science during her tenure of the fellowship, with preference to the chemical physiology of animals and plants. Appli cations must be sent in by June 8 to the PrinciPAL OF NEWSRAM COLLEGE, from whom further particulars may be obtained.

For other Scholastic Advertisements, see page xvi.

UNIVERSITY COLLEGE OF NORTH

WALES, BANGOR. (A CONSTITUENT College of the UNIVERSITY OF Wales.)

Applications are invited for the post of ASSISTANT LECTURER IN THE DAY TRAINING DEPARTMENT now vacant. Special subjects: Elementary Science, Blackboard Drawing. Salary, 4120.

Applications and testimonials should be received not later than Monday, June 12, by the undersigned, from whom further particulars may be obtained.

JOHN EDWARD LLOYD, M.A.,

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.

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