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WATKINS & DONCASTER,
CABINETS AND APPARATUS

BIRKBECK BANK

PHENIX
ASSURANCE COMPANY, LIMITED.

Naturalists and Manufacturers of
FIRE OFFICE.
19 LOMBARD ST., E.C., and 57 CHARING CROSS, S.W.

FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
ESTABLISHED 1782.

BRANCHES OF NATURAL HISTORY.
Moderate Rates. Absolute Security. Electric
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SPECIAL SHOW-ROOM FOR CABINETS.
Prompt Payment of Claims.

N.B.- For Excellence and Superiority of Cabinets and Apparatus, refer.
LOSSES PAID OVER £26,000,000.

ences are permitted to distinguished patrons, Museums, Colleges, &c.
A LARGE STOCK OF INSECTS, BIRDS' EUGS AND SKINS.
SPECIALITY.-Objects for Nature Study, Drawing

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

Birds, Mammals, &c., Preserved and Mounted by First-class monthly balances when not drawn below £100.

Workmen true to Nature. Deposits. 21% Interest allowed on Deposit Accounts.

All Books and Publications on Natural History supplied. Advances made. Stocks and Shares bought and sold.

36 STRAND, LONDON, W.C. Apply C. F. RAVENSCROFT, Secretary, Southampton Buildings, High Holborn, W.C.

(Five Doors from Charing Cross.)

Dr Our Catalogue (96 pp.) Post free on application. MICROSCOPICAL PETROGRAPHY. Gentlemen interested in the above study are invited to send to

ALBERT EDWARD JAMRACH JAMES R. GREGORY & CO.,

(Late CHARLES JAMRACH), 1 Kelso Place, Kensington Court, London, W.,

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For Collectors, Students, Technical Schools, Colleges, &c.

COLLECTIONS IN POLISHED DEAL BOXES. LANTERN and

25 Specimens, 5/6 ; 50 do., 10/6; 100 do., 21/-; 200 do., 42/

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Geology, Physiography, and Mineralogy. (As supplied to the Principal Universities, Technical Schools, &c.) Send for Catalogues to the actual preparers.

A large stock of Minerals, Rocks, Fossils and Microscopic Objects for

selection. Specimens sent on approval. FLATTERS & GARNETT, Ltd., Dealers in everything Microscopical, 48 Deansgate, Manchester,

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this Series, 11-net.
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other specimens of Pond Life. Price is. per Tube, Post Free. Helix Exit pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes.

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Rays.

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For prices and more detailed lists apply to ST. MARTIN'S STREET, LONDON, W.C.

Biological Laboratory, Plymouth.

THE DIRECTOR. NOTICE.-Advertisements and business letters for Nature should be addressed to the Publishers; Editorial Communications to the ditor. The telegraphic address of Nature is “ Phusis," LONDON. SUBSCRIPTIONS TO “NATURE."

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

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

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Descriptive Pamphlet gratis on application from the Sole Agents for Great Britain

and its ColoniesTHE MEDICAL SUPPLY ASSOCIATION,

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NEW AND BEAUTIFUL PREPARATIONS IN WATSON'S UNIQUE COLLECTION. Very fine Series, illustrating the development of an Ascidian

Groups of Diatomaceæ, Spicules, &c. A large variety at (Aspersa), 16 preparations in case 25 0 reduced prices ...

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NEW Edition of Supplementary List of latest Micro. Objects Beautiful Slides of Stephanoceros with cilia extended, price

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series of Aquatic Organisms, &c., &c. Lophopus crystallinus 4 6 Trypanosoma Brucei (Tsetse fly disease)

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3 6 Section of precious Opal, with matrix (opaque)

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36 Micro. Object. Shows scintillations strikiogly with low power Leal of Pampas Grass--very pretty section

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5 6 For a Guinea a year you can ve 240 Micro. Slides on hire from WATSON & Sons' Cabinets. Send for particulars. NEW.--WATSON'S DIFFRACTION BUTTONS. A scientific Novelty. These buttons are made of polished steel upon which spiral lines omab inchi apart are engraved. A beautifully soft radiated appearance is imparted by these lines, the colours being in the order of the Spectrum. Made in two sizes. H-inch diameter, 4/6 each ; 6 in case for 25/

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Post free on application to W. WATSON & SONS, (Established) Opticians to H.M. Government,

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25 NEWMAN ST., LONDON, W. 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, March 39, 1906

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye.”—WORDSWORTH.

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OPTICAL CONVENTION, 1905.

NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N.
President:

(Close to Holloway Stn., G.N.R., and Highbury Stn., N.LR.: Dr. R. T. GLAZEBROOK, M.A., F.R.S.,

LONDON UNIVERSITY SCIENCE AND ENGINEERING
Director of the National Physical Laboratory.

DEGREES.
Vice-Presidents:

Day and Evening Courses in the above under recognised teachers inSir WM. DE WivelesLIE ABNEY, K.C.B., D.C.L, F.R.S.

MATHEMATICS,
THE RIGHT HON. THE LORD BLYTHSWOOD.

PHYSICS,
Sir W. H. M. CHRISTIF, K.C.B., M.A., F.R.S.,

CHEMISTRY,
Astronomer Royal.

ENGINEERING. THE Right Hon. The EARL OF CRAWFORD, K.T., LL.D., F.RS.

Separate Laboratories for Elementary, Advanced and Honours students.
MR. Thos. R. DALLMEYER, F.R.A.S.

exceptionally large and well equipped.
THE HON. ALBAN G. H. GIBBS, M.A., M.P.,
Master of the Worshipful Co. of Spectarle Makers.

RESEARCH.
Sir HOWARD GRUBB, F.R.S.

Accommodation and apparatus provided for research in either Pure or The Right Hon. The LORD Kelvin, O.M., G.C.V.O., F.R.S.

Applied Chemistry and Physics, and Engineering, in rooms specially

adapted for this purpose. The Right Hon. The LORD RAYLEIGH, O.M., D.C.L., F.R.S.

Full particulars at the Institute or sent on receipt of postcard. The Right Hon. THE EARL OF Rosse, K.P., D.C.L., F.R.S.

REG. S. CLAY, D.Sc., Principal. THE OPTICAL CONVENTION will be held at the North AMPTON INSTITUTE, CLERKENWELL, E.C., from May 31 to

BEDFORD COLLEGE FOR WOMEN. June 3, inclusive. The object of the Convention is to bring into co-operation those

(UNIVERSITY OF LONDON.) interested in Optical Matters, from all sides of the question, theo.

YORK PLACE, BAKER STREET, W, retical, practical, and commercial.

The mornings will be devoted to papers and discussions on Optical The EASTER TERM begins on THURSDAY, APRIL 27, roos subjects. These will be collected in a volume to be issued by the The College provides instruction for Students preparing for the U Convention.

versity of London Degrees in Arts, Science, and Preliminary Medicis: There will be an

also instruction in subjects of General Education.

There is a Hygiene Department and an Art School. EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS

STUDENTS CAN RESIDE IN THE COLLEGE. of British manufacture, in the large hall of the Northampton Institute,

Particulars on application to the PRINCIPAL. during the Convention, open daily from 12 to 10 p.m. In connection

Two Entrance Scholarships, each one tenable for three years at Bella! with this, a catalogue is in preparation, which will be a useful work

College for Women, will be offered for competition in June, 1905 of reference in regard to instruments manufactured in this country

DEPARTMENT FOR PROFESSIONAL TRAINING IN The Subscription for Membership of the Convention will be five

TEACHING shillings. Applications for membership should be addressed to the

Students are admitted to the Training Course in October and January. Hon. Sec., Mr. F. J. Selby, M.A., Elm Lodge, Teddington, Middlesex, who will be glad to furnish further particulars if desired.

Two Scholarships, each of the value of £10, will be awarded for the

course of Secondary Training beginning in October, 1905. ADMISSION to the Exhibition, daily, ONE SHILLING,

Applications should reach the HEAD OF THE TRAINING DEPARTMEXafter 7 p.m., Sixpence.

not later than July 7, 1905. Tickets admitting to the Exhibition at any time while it is open, 2/6.

GUY'S HOSPITAL MEDICAL SCHOOL.

(UNIVERSITY OF LONDON.) UNIVERSITY OF BIRMINGHAM,

The SUMMER SESSION will begin on May 1, and Students then faculties.

entering will be eligible to compete for Entrance Scholarsbips of the e SOIENCE, ARTS, MEDICINE, COMMERCE.

bined value of 6360 in the following September, as well as for the Emre

Medals, Scholarships, and Prizes awarded during the period of Studenten SPECIAL SCHOOL OF MODERN LANGUAGES.

The Governors have opened an adDITIONAL 50 BEDS on the Medical DEPARTMENT FOR TRAINING OF TEACHERS.

side of the Hospital. Scbools ot

The numerous Hospital Appointments in both special and general

departments are open to Students without charge, and the bolder ENGINEERING, METALLURGY, MINING, BREWING, Resident Appointments are provided with board and lodging. DENTISTRY,

The Dental School provides the full Curriculum required for the LDS

England.
Leading to Degrees and Diplomas.

A Handbook of Information for those about to enter the Motical A ALL COURSES AND DEGREES ARE OPEN TO BOTH MEN AND WOMEN

session will be forwarded on application. STUDENTS.

For Prospectus of the School, containing full particulars us to T In the Medical School there is a separate Dissecting Room for Women

Course of Study advised, Regulations for Residents in the College with a qualified Woman Demonstrator.

apply personally, or by' letter to the Dean, Guy's Hospital, Lda

Bridge, S.E. Graduates of other Universities may, after two years' study or research, take a Master's Degree.

UNIVERSITY COLLEGE, LONDON. Syllabuses with all information will be sent on application to the SECRETARY.

(UNIVERSITY OF LONDON.)

FACULTY OF MEDICINE. EAST LONDON TECHNICAL

The SUMMER SESSION begins on WEDNESDAY, APRIL É COLLEGE.

The work is arranged so that a Student may advantageously gia

Medical Curriculum then.
SENIOR ENTRANCE SCHOLARSHIPS.

The Bucknill Scholarship and four Entrance Exhibitions will be avad

in October. The Drapers' Company propose to award in June, 1905, Six Senior Entrance Scholarships of the value of £40-tbree for boys and three for

Full information may be obtained from either of the undersigned girls between 16 and 19 years of age-tenable at the East London Technical

SIDNEY MARTIN, M.D., F.R.S. College, Mile End Road, for three years. The Scholarships will be awarded

Dean of the Faculty. on the result of an examination to be held by the London Inter-Collegiate

WALTER W. SETON, M.A., Acting Secres Scholarships' Board, full particulars of which, with forms of entry, may be obtained from the SECRETARY of the Board, King's College, London,

THE VICTORIA
W.C.
JUNIOR ENTRANCE SCHOLARSHIPS.

UNIVERSITY OF MANCHESTER. The Drapers' Company also offer for competition Ten Junior Entrance

FACULTY of MEDICINE Scholarships, which, in addition to the money value, will entitle the holders to exemption from the College tuition fees, value £15 first year, £20 second

(including the DENTAL PHARMACEUTICAL and PUILI year, and £30 third year. Candidates must be between 15 and 16 years of

HEALTH DEPARTMENTS). age on September 1, 1905. These Scholarships will be awarded on the The SUMMER SESSION will commence on Tuesday, April s T London County Council Intermediate Scholarships Examination in May registration of Students will begin on this day at 9.30 am. an a te next. The qualifications of means and residence attached to the Council's continued during the week (Saturday excepted). Scholarships will not apply to the Company's Scholarships. Forms of entry PROSPECTUSES, giving full information as to courses of su may be obtained from the CLERK to the Drapers' Company, Drapers' Hall, the MEDICAL and DENTAL DEGREES and DIPLONAS, Throgmorton Street, E.C.

will be forwarded on application to the Registrar.

BOARD OF EDUCATION, AUCKLAND, WELSH INTERMEDIATE EDUCATION ACT, 1889. NEW ZEALAND.

CENTRAL WELSH BOARD DEPARTMENT OF TECHNICAL EDUCATION

APPOINTMENT OF PRACTICAL SCIENCE EXAMINER, 1905. AND MANUAL TRAINING.

The Executive Committee of the Central Welsh Board will shortly Immediate applications are invited for the following appointments : proceed to the appointment of an EXAMINER of Practical Work in (1) TEACHER of WOODWORK for the THAMES MANUAL

PHYSICS. TRAINING SCHOOL. Candidates must have had experience in teach

The Examinations will take place between June 19 and July 8, 1905. ing Woodwork in primary schools, and, if possible, be qualified to give Preference will be given to candidates who have had experience in instruction in evening technical classes in some such subjects as Pattern. Secondary Teaching. Women will be equally eligible with men. making, Machine Drawing, Steam, Practical Mathematics, &c. Salary, £200 per annum for at least three years ; second class passage paid.

Applications for further particulars as to duties and remuneration should (2) TEACHER of WOODWORK for the WHANGAREI MANUAL

reach the undersigned not later than Saturday, the 15th instant. TRAINING SCHOOL. Candidates must have had experience in teach.

OWEN OWEN, Chief Inspector. ing Woodwork in primary schools, and, preferably, be qualified to give

Central Welsh Board Offices, instruction in evening technical classes in some such subjects as Building

Cardiff, Construction, Carpentry and Joinery, Practical Geometry, &c., Salary,

April 5, 1905. 4200 per annum for at least three years; second class passage paid.

(3) TEACHERS of COOKERY (2) for THAMES and WHANGAREI MANUAL TRAINING SCHOOLS. Candidates must have had experi

SECOND MASTER required for important eace in teaching Cookery in primary schools, and, preferably, be qualified

Grammar School.--Science and Maths. essential. Candidates must to give instruction in evening technical classes in some such subjects as

be University men, and have had successful experience. Salary, £180. Laundrywork, Dressmaking, Millinery, &c., Salary, 6160 per annum for

For particulars of the above and other Science and Mathl. posts, at least three years; second class passage paid.

address GRIFFITHS, SMITH, Powell & SMITH, Tutorial Agents (4) MASTER for HAND-AND-EYE TRAINING and ART SUB.

(Estd. 1833), 34 Bedford Street, Strand, London. JECTS. Applicants must possess Art Master's Certificate, and have had experience in teaching Art subjects. They should also have paid special (UNDER THE AUSPICES of His MAJESTY's Government.) attention to subjects of Hand-and-Eye Training such as are taught in the Standards of the English Primary schools. Salary, £200 per annum for at least three years; second class passage paid.

THE LONDON SCHOOL OF TROPICAL Full particulars can be obtained by sending stamped addressed foolscap

MEDICINE.
envelope to the undersigned,
c/o THE AGENT.GENERAL FOR NEW ZEALAND,

(UNIVERSITY OF LONDON.)
13 Victoria Street,
Westminster.

CONNAUGHT ROAD, ALBERT DOCK, E.
GEORGE GEORGE, F.I.C., F.C.S.,

(IN CONNECTION WITH THE HOSPITALS OF THE SEAMEN'S Director of Technical Education and Manual Training.

HOSPITAL SOCIETY.)
Auckland, N.Z.,
February 16, 1905.

The next SESSION commences on MONDAY, MAY 1, 1905.

For Prospectus, Syllabus, and other particulars, apply to the Secretary,
EGYPTIAN GOVERNMENT

P. MICHELLI, Esq., Seamen's Hospital, Greenwich, S.E.
SCHOOLS
In view of the extension of Secondary Education in Egypt, applications

PRACTICE) are invited for new ASSISTANT-MASTERSHIPS in Secondary Schools under Ministry of Public Instruction. Masters to begin work in September, In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for in Cairo or Alexandria, and to teach in English exclusively. Over 400 boys MEDICAL EXAMS. in each school, mainly Mohammedans. In the case of one of the Masters Especial Course of Instruction in THERAPEUTICS, PHARMAnow required, the subject mainly essential is Science (Experimental Physics COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY and Chemistry); six of the new Masters will be principally engaged in EXAM. teaching Mathematics (Arithmetic, Geometry, and Algebra); the others will

Mr. FREDERICK DAVIS, The Laboratories, be concerned more particularly with the teaching of English. Candidates must be not less than 23 nor over 30 years of age, have a robust constitution,

(Registered in Column B (Advanced Education), Teachers Registration and have taken a University Degree in Honours. They must have ex.

Councii, Board of Education, S.W.), perience as Teachers : preference will be given to applicants who hold a

49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. Diploma in Teaching." Salary, 4295 per annum (£Eg.24 per mensem), rising to £393 per annum (£Ég.32 per mensem). Allowance for passage out to Egypt. Teaching hours, on an average, four daily, Fridays only excepted. Summer vacation not less than two months.

HEADMASTER Wanted, Grammar School Applications, with full statement of qualifications, and accompanied by

near London. Fixed Stipend, £150. Capitation Fees and House. copies only of testimonials, must be sent in before May 15, 1905, marked outside Assistant Masterships," and addressed to the SECRETARY

SEVERAL GOOD POSTS IN GENERAL, Ministry of Public Instruction, Cairo, Egypt, to whom

SCIENCE AND MATHEMATICS Vacant. candidates may apply for further information.

APPLY-
SCHOOL OF
OF AGRICULTURE,

ORELLANA

CO.,
GHIZEH, EGYPT.

80 Wigmore Street, Cavendish Square, London, W.

(late of 44 Old Bond Street).
JUNIOR LECTURER IN AGRICULTURE.
Applications are invited for the post of JUNIOR LECTURER in

UNIVERSITY OF LONDON.
AGRICULTURE at the School of Agriculture, Ghizeb, under the Ministry
of Public Instruction.
Candidates must be not less than 23 nor over 33 years of age, have a

S.E. AGRIC. COLLEGE, WYE, KENT. robust constitution, and possess a University Degree or College Diploma in

An ASSISTANT CHEMIST is required. Commencing salary, 100 Agriculture. Preference will be given to applicants having experience of Agricultural Practice and Teaching. In addition to Agriculture, the

p.a. (with board and rooms or allowance for same). For particulars apply

to the SECRETARY. Lecturer appointed will be required to teach elementary Agricultural Botany and Entomology.

Salary, 4295 per annum (£Eg.24 per mensem), rising to £393 per annum APPLICATIONS are invited for the First (LEg.32 per mensem). Allowance for passage out to Egypt. Applications, with full statement of qualifications, and accompanied by

European Professorship (Physics) at Meerut College, Northern India. copies only of testimonials, must be sent in before May 4, 1905, to W. C.

Salary, 6320 per annum (450 passage-money). Candidates should be

University graduates, under 30 years of age, and unmarried. For MACKENZIE, Esq., D.Sc., Principal, School of Agriculture, Ghizeh, Egypt, to whom candidates may apply for further information.

particulars apply to Professor WORTHINGTON, Mobuns, Tavistock. THE HOLBURNE OF MENSTRIE Vacation employment required by Analyst, MUSEUM, BATH.

Ph.D., F.I.C. Used to teaching and to literary work of scientific

character, also to typewriting, photography, glass-blowing, and Wanted, an experienced CURATOR, single man, or married but without research. Own appliances. Small remuneration accepted. Easter 10 encumbrances, to take charge of the Museum, consisting of Antique Plate, July.--Apply " Beta," clo NATURE. Paintings, China, and other Works of Art. He will be required to reside on the premises. The Trustees are prepared to offer £150 per annum with furnished rooms. Applications to be made by letter only, and sent to the

For Sale.-Extensive Collections of British Museum, Charlotte Street, Bath.

Lepidoptera, Coleoptera, Tropical Butterflies, Cabinets, &c. Correctly N.B.- The Trustees can only communicate with a selected number of named type collections at very moderate prices.-- Particulars from applicants.

A. FORD, Hillside, Sunnyhill, Pokesdown, Bournemouth.

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