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SPINTHARISCOPES.

(As devised by Sir WM. CROOKES.) Showing the Scintillations of Radium. Fitted with powerful Lens, and contained in neat Leather Case.

Price 15/- Post Free anywhere. The scintillations seen in this instrument are from Pure Radium Bromide of the highest known activity, and are brighter and more plentiful than those produced from Pitchblende or any other radio-active substance.

SPINTHARISCOPE I See letter from Prof. Gotch on “The Spinthariscope and Retinal Excitability” (NATURE, June 22, 1905, page 174), setting forth a valuable scientific application of the instrument.

W.CROOKES Calcium Metal 115/- per Ib. Thorianite

4/- per oz. 11/3 per oz. Radium Bromide from £16 per 5 mgs.

1903

AS.COSSOR LONDO) A. C. COSSOR, 54 Farringdon Road,

Awarded Gold and

Silver Medals at
Telephone No. 10547 Central.
LONDON, E.C.

St. Louis Exhibition.
WATSON'S TELESCOPES
FOR AMATEURS.

23 DIFFERENT MODELS to select from, suited for The "CENTURY," with 3-inch Objective, mounted on Garden

d. Tripod, with Altazimuth Head ...

15 оо

every class of research. The Royal

Century," with 34-inch Objective, mounted on Garden Tripod, with Altazimuth Head, having move.

From $2 : 2 : 6 upwards. ments by screws and Hook's handles

36 10 0 The above are fitted with the beautiful Watson-Conrady

Watson's Microscopes are designed to afford the utmost conObjectives, yielding the finest performance.

venience and comfort combined with absolute accuracy for The "POPULAR," with 3-inch Objective, mounted on Garden

scientific work. They are up-to-date and of highest quality. Tripod, with Altazimuth Head ...

9 10 0 For larger sizes of above and full particulars of

For full particulars see WATSON'S TELESCOPES WATSON'S 1906 CATALOGUE OF MICROSCOPES Send for List No. 6, post free on application.

(188 pages) post free on application. WATSON'S INSTRUMENTS MAY BE PURCHASED BY PROGRESSIVE PAYMENTS. W. WATSON & SONS, Opticians to H.M. Government, (Established 1837)

313 HIGH HOLBORN, LONDON, W.C. BRANCHES-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM.

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WATSON'S MICROSCOPES.

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J. H. DALLMEYER, Ltd., 25 Newman Street, London, W.,

Stigmatic Lens fitted with Tele-Photo. Attachment.

MAKERS OF (These Attachments can be fitted to any good Lens.)

THE CELEBRATED DALLMEYER LENSES. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and puolished by MACMILAN

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Library

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground Of Nature trusts the mind which builds for aye."-WORDSWORTH. No. 1907, VOL. 741

THURSDAY, MAY 17, 1906 (PRICE 15 CENTS Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved. Newton's New Demonstrator's

REYNOLDS & BRANSON, Ltd.,
Chemical and Scientific Instrument Makers to His Majesty's

Government (Indian, Home, and Colonial). "Transpaque" Lantern

LABORATORY FURNISHERS and MANUFACTURING CHEMISTS. Has all the advantages of our well-known

* Demonstrator's" Lanterns, and in addition will show brilliantly on the

sereen, opaque objects or book Mustrations, if not

larger than a large postcard.

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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.

NEWTON & Co., 3 FLEET STREET, LONDON.

THE

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"BOYS” CALORIMETER

for determining the Calorific Value of Cas,

SELF-RECORDING

RAIN-GAUGE.

devised by

C. V. BOYS, F.R.S.,

IS MADE BY

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Illustrated Price List and full parti ulars gost free on

application 10
NEGRETTI & ZAMBRA,

38 HOLBORN VIADUCT.
Branches : 45 CORNHILL, and 122 REGENT STREET,

PARTICULARS MAY BE OBTAINED

SEPTEMBER MATRICULATION.

TUITION BY CORRESPONDENCE

NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N. Day and Evening Classes for the September Matriculation of London University may be taken up at any time, as the (Close to Holloway Stn., G.N. R., and Highbury Stn., N.L.R.) Classes at

LONDON UNIVERSITY SCIENCE AND ENGINEERING

DEGREES. UNIVERSITY TUTORIAL COLLEGE

Day and Evening Courses in the above under recognised teachers in

MATHEMATICS, work continuously through the Summer vacation. Fifty-two

PHYSICS, successes at January Matriculation.

CHEMISTRY, Classes in PRACTICAL CHEMISTRY, PHYSICS,

ENGINEERING. BIOLOGY AND GEOLOGY are held during August.

Separate Laboratories for Elementary, Advanced and Honours students,

exceptionally large and well equipped. Prospectus may be had, post free, from the Vice-PRINCIPAL,

RESEARCH. University Tutorial College, Red Lion Square, Holborn.

Special arrangements for students undertaking research during vacations.

Full particulars al tbe Institute or sent on receipt of postcard.
INDIAN FOREST SERVICE.

REG. S. CLAY, D.Sc., Principal.
An Examination will be held by the Civil Service Commissioners on
August 28, 1906, for the selection of not less than nineteen candidates
for appointment as PROBATIONERS for the INDIAN FOREST
SERVICE
Age limits :--18 to 21 years, on January 1, 1906.

by an especial unique method for all Examinations in BIOLOGY, Subjects of examination :-(1) Mechanics and Physics, (2) Chemistry, BOTANY, CHEMISTRY, GEOLOGY, HUMAN PHYSIOLOGY. and (3) Botany.

HYGIENE, MATERIA MEDICA, PSYCHOLOGY and ZOOLOGY. Period of Probation :--The period of probation will extend over about three years. For the first two years the Probationers will be required to

Writing reduced to a minimum. Work directed. Test Papers corrected undergo a special course of study at Oxford and to become members of the

and returned. University if not so already. During the third year of their probation

Address Mr. FREDERICK DAVIS, they will receive practical instruction on the Continent.

IMPERIAL COLLEGE, Applications for admission to the examination must be made on a printed form to be obtained (with further particulars, including information as to 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. certain enhanced rates of pay announced March 28, 1906, as to the appoint. ments, &c.) from the SECRETARY, Judicial and Public Department, India Office, Whitehall, London, S.W., and to be returned to him not later than

COUNTY OF LONDON.
SATURDAY, JUNE 30. 1906.
No applications received after that date will be considered.

The London County Council invites applications for the appointment of

an ASSISTANT MISTRESS, specially qualified in Mathematics, Botany, A. GODLEY, Under Secretary of State. Physics, or Elementary Practical Science, at the Burghley Road Higher India Office, London,

Grade Girls' School, Highgate Road, N.W. October 30, 1905.

The Salary will be in accordance with the London County Council scale, particulars of which are set out upon the form of application.

Applications should be made on Form 40H.G., to be obtained from the UNIVERSITY OF CAMBRIDGE. Clerk of the London County Council, Education Offices, Victoria Embank

ment, W C., to whom they must be returned not later than 10 m.m. on LONG VACATION COURSE, 1906.

May 28, 1906, accompanied by copies of three testimonials of recent date.

Candidates applying through the post for the form of application should PATHOLOGY, PUBLIC HEALTH AND PHARMACOLOGY.

enclose a stamped and addressed envelope. This year the work of the Long Vacation Course will be divided into Candidates, other than successful candidates, invited to attend the three sections: (1) (for D.P.H. Students) commencing on Monday,

Committee, will be allowed third-class return railway fare, but no other June 25, and (2) (for Junior Students of Medicine) and (3) (for Advanced expenses. Students, Medical Men, Veterinary Surgeons, &c.) commencing on Canvassing, either directly or indirectly, will be considered a disqualiMonday, July 2.

fication. Any further information may be obtained from Mr. E. E. STUEBINGS,

G. L. GOMME, Clerk of the London County Council. Pathological Laboratory, Medical School, Cambridge.

Education Offices, Victoria Embankment, W.C. Cambridge, May 4, 1906.

EGYPTIAN GOVERNMENT SCHOOLS.

In view of the extension of Secondary Education in Egypt, applications are invited for new ASSISTANT-MASTERSHIPS in Secondary Schools under the Ministry of Education. Masters to begin work in October, in

Cairo or Alexandria, and to teach in English exclusively. Over 400 boys ALBEMARLE STREET, PICCADILLY, W.

in each School, mainly Mohammedans. In the case of two of the Masters

now required, the subject mainly essential is Science (Experimental Physics Professor Sir JAMES DEWAR, M.A., LL.D., D.Sc., F.R.S., will, on and Chemistry); six of the new Masters will be principally engaged in Saturday next, May 19. at Three o'clock, begin a course of Two Lectures

teaching Mathematics; the others will be concerned more particularly with on "THE OLD AND THE New CHEMISTRY. Subscription to this Course the teaching of English, including History and Geography. Candidates Half-a-Guinea; to all the Courses in the Season, Two Guineas.

should be not less than 23 nor over 30 years of age, have a robust consti. tution, and have taken a University Degree in Honours. They should have

experience as Teachers : preference will be given to applicants who hold a LINNEAN SOCIETY OF LONDON.- Diploma in Teaching. Salary: £295 per annum (LER.24 per mensem),

rising to £393 per annum (£ES:32 per mensem). Allowance for passage Notice is hereby given that the Anniversary Meeting will be held at the Society's apartments at Burlington House on Thursday, May 24, 1906,

out to Egypt. "Teaching hours, on an average, four daily, Fridays only

excepted. Summer vacation not less than two months. at 3p.m.-B. DAYDON JACKSON, General Secretary.

Applications, with full statement of qualifications and accompanied by

copies only of testimonials, must be sent in before May 31, 1906, marked BIRKBECK COLLEGE.--BOTANY. outside " Assistant-Masterships," and addressed to H. J. Boyd.CARPENTER, There will be a vacancy in September for a HEAD of the BOTANY

Esq., Senior Inspector, Ministry of Education, Cairo, Egypt, to whom

candidates may apply for further information. DEPT. At present the appointment is not full time, but for three mornings (or afternoons) and three evenings per week. Salary proposed, 6200. Candidates should tate academic and other qualifica. UNIVERSITY OF BIRMINGHAM. tions, age and experience in teaching, and should enclose not more than three testimonials. --Apply to PRINCIPAL, Eirkbeck College, Breams

TWO ASSISTANT LECTURESHIPS IN MATHEMATICS. Buildings, Chancery Lane, E.C.

The Council invites applications for the above appointments. Stipends,

$175 and 6150 per annuni, respectively. TELESCOPES.-For sale, new 4" Astro

Applications, accompanied by testimonials, should be sent to the under nomical Telescope by Cooke, jointed boy, packed in strong mahogany signed not later tbau Tuesday, June 5, 1906. case. Object glass by TAYLOR of COOKE's, corrected for photography, The candidates elected will be required to enter upon their duties on 1" star finder, 8 astro, powers, 4 day draws, star diagonals, &c. Oak

October 1, 1906. stands. Photographic camera and all accessories. Also large wood body telescope and reflecting telescope. Full particulars on application

Further particulars may be obtained from

ROYAL INSTITUTION OF

GREAT BRITAIN.

BROWNING'S PLATYSCOPIC LENS.

S.

JOHN BROWNING, emailem, 78 STRAND, LONDON.

COUNTY BOROUGH of WATERFORD.

TECHNICAL INSTRUCTION COMMITTEE. The Technical Instruction Committee for the County Borough of Water. ford invite applications for the following appointments :(1) HEADMASTER and ORGANISING SECRETARY, Salary

WITH LARGER ANGLES, INCREASED FIELD, AND (24o, rising by £10 annually to £300. Qualifications must include Theo

IMPROVED DEFINITION. metal and Practical Chemistry and Physics, and Teaching and Organising caperience will be required to perform the duties of Organising Secretary an Hearlmaster of Day and Evening Classes, and to supervise equipping of new Technical School. Duties to be commenced on July 1.

**) MAXUAL INSTRUCTOR in Wood and Metal Work. Salary Liso, rising by L10 annually to £180, Qualifications must include Build. inz Trades subjects, Applied Mechanics, Machine Construction and Metal Worlabry Practice. Duties to be commenced in September.

10 DOMESTIC ECONOMY INSTRUCTRESS. Salary £80, which

ll be increased by 610 annually to £120. Certificates in Cookery, I dry Work, Needlework (including Dressmaking), Housewifery and Hygiene required (1st class in Cookery, and in Laundry Work or Needle. weak required). Duties to be commenced in September.

Engraved Real Size. The candidates appointed will be wbole time officers of the Committee,

AN ACHROMATIC COMBINATION, ori may be required to give instruction in schools other than the Technical

COMBINING THE DEFINITION OF A MICROSCOPE WITH THE Strojis Applications, stating qualifications, experience, age, and giving

PORTABILITY OF A POCKET LENS refereness as to character, to be received on or before May 20, 1906, by

"If you carry a small Platyscopic Pocket Lens (which every JAMES J. FEELY, Secretary to Committee.

observer of Nature ought to do)." -GRANT Allen, in Knowledge. Town Hall, Waterford.

"I have long carried one of these instruments and found it May 1, 1906.

invaluable." JOHN T. CARRINGTON, Editor of Science Gossip.

The Platyscopic Lens is invaluable to botanists, mineralogists, UNIVERSITY OF LONDON. or entomologists, as it focuses about three times as far from the GOLDSMITHS' COLLEGE, NEW CROSS.

object as the Coddington Lens, and has a field unequalled for DEPARTMENT FOR THE TRAINING OF TEACHERS.

Aatness, allowing opaque objects to be examined easily.

It is made in four degrees of power, magnifying respectively About to additional Teachers (Men and Women) will shortly be ap. pointed in the above Department.

10, 15, 20, and 30 diams. ; the lowest power, having the largest These will include an Assistant Master of Method, an Assistant Mistress field, is the best adapted for general use. uf Method (for Infant School Tea hing), and teachers of English Litera

Mounted in Tortoiseshell, magnifying 10, 15, 20, or 30 d. tart. French. History, Mathematics Elementary Science, The majority of the salaries will be, Men, between £175 and 6250 a

diameters, either power ...

15 0 yeas and, for Women, between £150 and £200 a year ; but more or less In Nickelised German Silver, either power

17 6 may le vaid in exceptional cases. Aa Assistant Manual Instructor (salary £100 or £120 a year) is also

Combinations of any two powers, in Tortoiseshell 27 6 rexpirert

Ditto Ditto in Nickelised German Silver

32 6 Applications must be received not later than Saturdav, June 2, 1906.

ILLUSTRATED DESCRIPTION SENT FREE. Particulars may be obtained from the WARDEN, Goldsmiths' College, ke Cas, S E.

Optician,

ESTABLISHED 1765.
ROYAL INSTITUTION OF
GREAT BRITAIN.

BOROUGH OF HASLINGDEN. ALBEMARLE STREET, PICCADILLY, W.

MUNICIPAL SECONDARY SCHOOL.
Professor WILLIAM J. SOLLAS, LL.D., D.Sc., F.R.S., will on
Tourvtak next, May 24, at Five o'clock, begin a course of Three Lectures

WANTED, SENIOR MISTRESS, especially qualified in French. on MAN AND THE GLACIAL PERIOD." Subscription to this course,

Commencing salary, £120, rising by biennial increments of £10 to £160 per Hall---Guinea ; to all the courses in the Season, Two Guineas.

annum, with further increments not automatic on special recommendation.

ASSISTANT MISTRESS; commencing salary, £100 per annum, rising CITY OF BIRMINGHAM EDUCATION

by biennial increments of £10 to 6135 per annum, and by further increments

noi automatic on special recommendation. COMMITTEE.

Candidates for either position must be graduates or possess equivalent The Committee requires the services of an ASSISTANT MASTER for

qualifications. the Central Secondary School. Salary, 6100 10 6160 per annum, according

Applications, erdorsed "Senior Mistress” or “Assistant Mistress " as to qualifications and experience. Candidates must be qualified to teach

the case may be, stating age, qualifications, experience and when disChesnutta. Mathematics and Physics desirable. Form of application may

engaged, and accompanied by copies only of three recent testimonials. to be obtained from the undersigned

be sent to the undersigned not later iban Tuesday, the 29th day of May JNO. ARTHUR PALMER, Secretary. Educacion Department, Edmund Street, May 14, 1906.

WALTER MUSGROVE, Town Clerk.

Municipal Offices, May 15, 1906.
UNIVERSITY OF MANCHESTER.
HARLING RESEARCH FELLOWSHIP.

BATTERSEA POLYTECHNIC,
A RESEARCH FELLOWSHIP in PURE OF APPLIED PHYSICS

BATTERSEA PARK ROAD, S.W. of the value of £125 per annum is offered for award in July nexi. Candidate must give evidence of being able to conduct an independent research, PRINCIPAL-SIDNEY H. WELLS, Wb.Sch., A.M.I.C.E., ate it possible, the nature of the research they intend to pursue under

A.M.I.M.E. tbe direction of the Professor of Physics (Dr. A. Schuster), and give

GAS ANALYSIS. particulars of their previous training and education.

Applications should be sent not later than June 20 to the REGISTRAR, A Special Course of Eight Lectures and Laboratory work on Gas man whow details of conditions may be obtained.

Analysis will be given by Mr. JOHN WILSON, M.Sc. (Head of the Chemical

Department), on Wednesday evenings, commencing May 23. BOROUGH OF ASTON MANOR Lectures, 7.15—8.15; Laboratory, 8.15—9.45. Fee, 55.

For prospectus apply to the SECRETARY. EDUCATION COMMITTEE. ASS STANT SCIENCE MASTER required, qualified to teach Elec. TO SCIENCE AND MATHEMATICAL frual Enoncering. Matbematics, Steam, Applied Mechanics and Engineer. MASTERS.- Immediate and September Vacancies.-Graduates and og ul.mcts generally. Commencing Salary, 6130 per annum. Graduate other well qualified Masters seeking posts in Public and other Schools prefere". Applications, giving full particulars and enclosing copies of sbculd apply at once, giving full details as to qualifications, &c., dure reun testimonials, should be sent to the SECRETARY, Education to Messts. Griffiths, SMITH, POWELL & SMITH, Tutorial Agents Ofe, Altert Road, Aston Manor, not later than May 31, 1906.

(Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice

of all the best vacancies will be sent. FORWAY. - S.Y. “ MIDNIGHT SUN." 3,278 tons. Two Berth Cabins. No Upper

TYPE-WRITING UNDERTAKEN BY kerths in the ship. Finest yachting steamer

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. 12 12 - 2

TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higber 16 and 30; July 14 and 28 ; August 11 and 25.

Local, thorough acquaintance with Modern Languages). Research, Apply ALBION S.S. CO., LTD.,

Revision, Translation. Scale of charges on application. The Cam Newcastle-on-Tyne.

bridge Type-writing Agency, 10 Duke Street, Adelphi, W.C.

instant.

NORWAY

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FORTIN'S STANDARD BAROMETER

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Designed by Prof. LOOSER, of ESSEN, enables

57 PHYSICAL EXPERIMENTS to be performed in the simplest and most striking manner

in view of the whole class.
Has had a phenomenal sale in France and Germany.

The Complete Apparatus, price £9 98. A copy of the English Translation of Prof. Looser's book, fully describing the apparatus and the experiments that can be made with

it, will be sent GRATIS and POST FREE on application to the SOLE AGENT for the apparatus in U.K.

and Colonies,

C. L. MÜLLER, 6 PARTON STREET, RED LION SQUARE, LONDON, W.C.

(Registered Design No. 420,297.) As will be seen by the illustration, this Barometer built on originallines.

By the absence of the ordinary tubular enclosures (in the usual form of instrument) the mercurial column is FULLY. EXPOSED to view, NO SHADOWS are thrown upon the column, and therefore an extremely accurate and instantaneous reading is made possible. The scales being graduated upon the flat side pieces the DIVISIONS AND FIGURES ARE ALWAYS IN VIEW, and the vernier is very much more legible than in the ordinary Tubular patterns.

The bore of the tube is 0.5 inch.

The scales are graduated in inches and millimetres, and, by means of the verniers, are capable of being sub-divided to read 10 0·002 inches and 0.1 m/m.

The attached Thermometer on the body of the instru. ment is graduated in Fahrenheit and Centigrade scales.

It is the BOLDEST Standard Barometer made.

The PRICE IS LOWER than that of any other form of Standard Barometer of the same dimensions.

It yields readings equally close as the highest priced instruments.

Price complete, mounted on handsome Polished Solid Mahogany Board, with Brackets for Suspension, and Opal Glass Reflectors,

£7 10s. Od. SMALLER SIZE, "THE STUDENTS," designed for Schools for demonstration work, and small private Observatories; bore .25 ; reading to '01 inch

and '1 millimetre. £3 78. 60. Sole Manufacturers and Proprieters of the Regd. Design: PASTORELLI & RAPKIN, Ltd.,

46 HATTON GARDEN, LONDON, E.C. ACTUAL MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS.

Contractors to H.M. Government. Esid. 150 years. Telegrams: “Rapkin, London." Nat. Tel. : 1981 Holborn. N.B.-If any difficulty in securing our Instruments

through your Dealer, kindly communicate with us.

name

HIGH GRADE SET.

No. 720.-Very superior Pocket Case, made of maho. gany, with clamped top and bottom, covered in real" Russia leaiher, long hinge, pin fastening, and silver plate, lined silk velvet. and fitted with W. H. Harling's extra quality instruments, having knee joints and either Harling's improved or and bolt needle points. CONTENTS - 6-inch

Half Set ; 5-inch improved pattern Hair-spring Divider ; Ink Bow Compass ; Pencil Bow Compass ; Set of

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€5 14 6 W. H. HARLING,

Mathematical, Drawing, and Surveying

Instrument Manufacturer, 47 Finsbury Pavement, London, E.C.; & at Crosvenor Works, Hackney.

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