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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.

LANDSCAPE IN HISTORY & OTHER ESSAYS. By Sir ARCHIBALD GEIKIE, D.C.L., F.R.S.

8vo. 8s. 6d. net.

ATHENÆUM.-"Whilst Sir Archiba'd'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 GRAPHIC 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.

THE

MAY NUMBER JUST PUBLISHED.

SCHOOL

WORLD.

A MONTHLY MAGAZINE OF EDUCATIONAL WORK AND PROGRESS.
SIXPENCE MONTHLY. YEARLY VOLUME, 7s. 6d. NET.

PRINCIPAL CONTENTS.

School Cadet Corps. I. By Edward C. Goldberg, M.A., Capt. 1st 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 Life. 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 Heuristic Method of Teaching Science. By Examiner.-Individual Attention. By Robert L. Leighton, M. A.-The Education of Intending Pupil Teachers. By G. A. Christian, B.A. -The Value of Drawing. By Lettice A. MacMunn.-Transfer of Secondary Schools to Local Education Committees. By S. J. G. MACMILLAN AND CO., LIMITED, LONDON.

RECENT & COMING ECLIPSES.

BY

Sir NORMAN LOCKYER,
LOCKYER, K.C.B.,
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,

Naturalists and Manufacturers of CABINETS AND APPARATUS

FOR ENTOMOLOGY, BIRDS EGGS AND SKINS, AND ALL
BRANCHES OF NATURAL HISTORY.

SPECIAL SHOW-ROOM FOR CABINETS.
NB-For Excellence and Superiority of Cabinets and Apparatus, refer-
aces 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.

ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POlished DEAL BOXES.

15 Specimens, 5/6; 50 do., 10/6; 100 d., 21/-; 200 do., 42/to 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.

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,

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, 7/-; 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

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THE NEW COLLECTION OF

336 SPECIMENS AND SLIDES OF ROCKS,

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 massive 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.

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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 distinction in University or Civil Service. Small premium. Pocket-money allowed. Apply:- THE DIRECtor, MicrologICAL LABORATORY, 11 ASPENLEA ROAD, HAMMERSMITH, LONDON, W.

LIVING SPECIMENS

THE

FOR

MICROSCOPE.

Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price 15. 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, Caryophyllia, Alcyonium; 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.

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.

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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.

ISENTHAL & CO., 85 Mortimer St., London, W.

Contractors to the Admiralty, War, India & Colonial Offices, &c.

THE

WOODHOUSE

INCLINED PLANE.

Price 25/

TOWNSON & MERCER, 34 CAMOMILE STREET, E.C.

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 milligrammes as compared with 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).

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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, 66 Fifth Avenue, New York,-THURSDAY, May 4, 1903.

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THE NEW BOOK

PRICE ONE SHILLING.

Containing an original description of the principles and function 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.

CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied
to National Physical Laboratory, Teddington, fitted for Gas, Water
and Electricity.
Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200
Illustrations, free on application.
DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS.
14 COMMERCIAL STREET, LEEDS.

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MAY

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1905

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EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS

of British manufacture, in the large hall 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 addressed 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.

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. Friends of Fellows are admissible to the dinner as far as space will LI IS. permit. Applications for tickets should be made to the Chief Clerk, 1 Savile Row, Burlington Gardens, W.

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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 £500 per annum on appointment, £600 per annum after three years' service, £700 per annum after ten years' service, together with a merit grant of £75 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.

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, 120. 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.,

BIRKBECK COLLEGE

BREAM BUILDINGS, CHANCERY LANE, E.C.

FACULTY OF SCIENCE.

Chemistry

Physics ...

Mathematics

Botany Zoology...

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JJ. E. MACKENZIE, Ph.D., D.Sc
H. WREN, Ph.D., B.A., B.Sc.
(ALBERT GRIFFITHS, D.Sc.
D. OWEN, B.A., B.Sc.

B. W. CLACK, B.Sc.

E. H. SMART, M.A.

W. G. BIRT, B.A., B.Sc.

A. B. RENDLE, M.A., D.Sc. F. E. FRITSCH, Ph.D., B.Sc. H. W. UNTHANK, B.A., B.Sc. Geology & 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, Theoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating. Calendar 6d. (post free 8d.), on application to the SECRETARY.

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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 pro fessions. 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 and Calendar or the Evening Class Prospectus for 3d. The Prospectuses may be had at the Office for id. each.

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, Differ 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 Prof. Preliminaries -Apply to Mr. J. CHARLESTON, B.A., Burlington Corre spondence College, Clapham Common, London, S. W.

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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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