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Naturalists and Manufaoturers 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 distinguished patrons, Museums, Colleges, &c.
A LARGE STOCK OF INSECTS, BIRDS' BOOS 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.)
DE CATALOGUE (102 pp.) POST FREE.

Just Issued.
See Nature, May 17, page 63.

FLATTERS & GARNETT, Ltd.,

48 Deansgate,

Manchester.

VOLCANIC DUST

FROM VESUVIUS. We have a few tubes of this for disposal, 1s, 2d. each,

post free. NEW and EXTENDED EDITION of TABLE of RARE ELEMENTS, giving full scientific particulars, 6d. post free.

ARMBRECHT, NELSON & CO., Scientific Chemists, 71 & 73 Duke Street, Grosvenor Square, London, W.

SAVAGE CURIOSITIES.
ETHNOGRAPHICAL SPECIMENS.
Stock of over 10,000 Specimens of Weapons, Implements, Ornaments,
Dress, Idols, Musical Instruments, &c., &c., used by all the Races of
Mankind, for sale at very low prices. All objects guaranteed genuine.
Trophies of genuine old Arms made for Billiard Rooms, Halls, &c.,
prices from 255. ; also mounted Horns. - Catalogue of Ethnographical
Specimens illustrated with Bromide Photographs, ad montbly, 3s. 6d.
yearly. Collections Arranged and Catalogued. Specimens bought.

W. 0. OLDMAN, 77 BRIXTON HILL, LONDON, S.W.

Collections and Single Specimens of
British and Foreign

Minerals, Rocks, Fossils, Metallic MINERALS, ROCKS, FOSSILS.

ROCKS, FOSSILS. Ores, Rough Precious stones, &c. 25 Specimens, 5/6 ; 50 do., 10/6; 100 do., 21/- ; 200 do., 42/

A Large Assortment from all parts of the world always on view, and at

all prices. Inspection invited. 20 Coal Measure Rocks and Fossils, 12/6 ; do., larger, 15/-. In Polished Deal Baixes.

Crude Mineral for Chemistry Students and Technical Schools. sipatior invited of a large stock of Minerals, Rocks, Fossils, and

Single Crystals and Teaching Specimens in Great Variety. Microscopic Ubjects. Specimens sent on approval. Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes,

RICHARDS' SHOW ROOMS, Models of Crystals, and other Apparatus for Geologists, &c.

3 Beauchamp Place, Brompton Road, South Kensington, NEW CATALOGUES POST FREE

London, S.W. THOMAS D. RUSSELL, 78 Newgate St., London, E.C.

LIVING SPECIMENS FOR NOTICE OF REMOVAL.

THE MICROSCOPE.

Volvox, Spirogyra, Desinids, Diatoms, Amoba, Arcella, Actinosphærium, JAMES R. GREGORY & Co., Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many MINERALOGISTS, &C., other specimens of Pond Life.

Helix Price is. per Tube, Post Free.

pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes. of KELSO PLACE, KENSINGTON,

THOMAS BOLTON, beg to announce that they have removed to more convenient

25 BALSALL HEATH ROAD, BIRMINGHAM. and commodious Premises at 139 FULHAM ROAD, SOUTH KENSINGTON, S.W. MARINE BIOLOGICAL ASSOCIATION

OF THE UNITED KINGDOM.

THE LABORATORY, PLYMOUTH.

The following animals can always be supplied, either living ESTABLISHED 1851.

or preserved by the best methods :

Sycon; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, Alcy. Current Accounts. 2% Interest allowed on minimum onium; Hormiphora (preserved); Leptoplana; Lineus, `Ampbiporus, monthly balances when not drawn below £100.

Nereis, Aphrodite, Arenicola, Lanice, Terebella ; Lepas, Balanus, Deposits. 21% Interest allowed on Deposit Accounts.

Gammarus, Ligia Mysis, Nebalia, Carcinus ; Patella, Buccinum, Eledone, Advances made. Stocks and Shares bougbt and sold.

Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Ecbinus, Apply C. F. RAVENSCROPT, Secretary,

Ascidia, Salpa (preserved), Scyllium, Kaia, &c., &c.
Southampton Buildings, High Holborn, W.C.

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

THE DIRECTOR

BIRK BECK BANK

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NOTICE.- Advertisements and business letters for Nature should be adiressed to the Publishers; Editor ial Communications to the Editor. The telegraphic address of Nature is “ PHUSIS," LONDON. SUBSCRIPTIONS TO "NATURE."

CHARGES FOR ADVERTISEMENTS. s. d. TO ALL PLACES ABROAD:- 6 s. d.

£ s. d.

& S. d. Yearly

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Yearly
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Per Line after .

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1 15 Hall-yearly O 14 6 Hall-yearly

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Cheques and Money Orders payable to MACMILLAN EN CO., Limited.

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THE CAIFFE AUTO-MOTOR ပ

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(Patented in Britain). NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR.

The interruption cuts the current both for motor and coil. In other words motor and interrupler are electrically and mechanically linked together. kuns 500 working hours without requiring attention.

See Nature, July 20, 1995, page 277. The leading experts have reported in terms of the highest praise upon this Break after, continuous use (rride Testimon als)

Price, including box and packing, £4 :6:6 THE MEDICAL SUPPLY ASSOCIATION, 228 Gray's Inn Road, London, W.C.

Descriptive Circular upon application. The NEW RAPID” MERCURY INTERRUPTER.

A break comprising all the latest improvements with a simple and reliable method of raising and lowering the mercury.

Fitted with first-class molor of any voltage up to 250. Requires only 2 lbs. of mercury, and is simplicity itself for cleaning. Price

£5 : 5 : 0 The “CALDWELL" ELECTROLYTIC INTERRUPTER.

Will work on direct or alternating circuits from 50– 250 volts without interposing any resistance.

Current adjustel by jack anıl pinion movemen', giviny perlict regulation with any lube. No expensive platinum panis tw replace. Price

£3 : 10 : 0

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A. C. COSSOR, 54 Farringdon Road, London, E.C.

Gold and Silver Medals awarded at St. Louis Exhibition.

Telephone : 10547 Ce: tral,

INTENSIFIED

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INDUCTION COIL.

Specially designed for X-Ray Work, &c.

FULL PARTICULARS ON REQUEST TO

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AND AT

Edinburgh & Birmingham.

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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 tread Street Hill, Queen Victoria Street, in the City of Lonaon, and publishe by Macuri LAS

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground

Of Nature trusts the mind which builds for aye."—WORDS WORTH. No. 1919, VOL. 74]

THURSDAY, AUGUST 9, 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 "Transpaque" Lantern

Government (Indian, Home, and Colonial).

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

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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.

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Illustrated PRICE LIST

of this and other Aneroid Barometers

free by post

on application to

& ZAMBRA, 38 HOLBORN VIADUCT, LONDON, E.C.

JOHN J. GRIFFIN & SONS, Ltd., NEGRETTI

&

KINGSWAY, LONDON.

UNIVERSITY OF BIRMINGHAM.

..

FACULTY OF SCIENCE. Mathematics

\Prosessor HEATH, Mr. PREECE, Mr. McLAREN

and Mr. GRIFFITH. Physics

| Professor POYNTING, Mr. SHAKESPEAR, Dr.

BARLOW and Dr. DENNING. Chemistry

Professor FRANKLAND, Dr. FINDLAY, Dr.

McCOMBIE, Dr. MURRAY and Mr. TINKLER. Zoology

Professor BRIDGE and Mr. COLLINGE. Botany

Professor HILLHOUSE and Mr. WEST. Geology and Geography

(Professor LAPWORTH, Dr. Groom and Mr.

Raw.

(Professor Mechanical Engineering

BURSTALL, Mr.

PORTER, Mr. HAZEL, Mr. Girl and Mr. SINCLAIR. Civil Engineering

Professor Dixon, Mr. HUMMEL ard Mr. BAIN. Electrical Engineering

Professor Kapp, Dr. MORRIS, Mr. Kipps and

(vacant). Metallurgy

Professor TURNER, Mr. HUDSON and Mr.

LEVY. Mining

ĮProfessor REDMAYNE, Mr. BORLASE and Mr.

BRIGGS.
Professor BROWN, Mr. POPE and

Mr. Brewing.

ROBOTTOM.

NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N. (Close to Holloway Stn., G.N.R., and Highbury Sun., N.L. R.) LONDON UNIVERSITY SCIENCE AND ENGINEERING

DEGREES.
Day and Evening Courses in the above under recognised teachers in-
MATHEMATICS,

PHYSICS,
CHEMISTRY,

ENGINEERING. Separate Laboratories for Elementary, Advanced and Honours students, exceptionally large and well equipped.

RESEARCH. Special arrangements for students undertaking research during vacations. Full particulars at the Institute or sent on receipt of postcard.

REG. S. CLAY, D.Sc., Principal.

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FACULTY OF COMMERCE. Commerce

Professor ASHLEY. Finance

Professor KIRKALDY. Accounting

Professor DICKSEE. Commercial Law,

Mr. TILLYARD.
Spanish and Italian

Senor DE ARTEAGA.
DEPARTMENT FOR TRAINING OF TEACHERS.
Professor Hughes.

Miss CLARK.
Miss Joyce.

Miss TAYLOR.
Mr. ROSCOE.

Miss WARMINGTON.
Mr. MILLIGAN.

Miss ŞOWERBUTTS.
Mr. BUTLER.

Miss WALKER.
Mr. GRIFFIN.

Miss COLLIE.

ENGINEERING AND TECHNICAL OPTICS. NORTHAMPTON INSTITUTE,

CLERKENWELL, LONDON, E.C. MECHANICAL AND ELECTRICAL ENGINEERING. Full Day Courses in the theory and practice of the above subjects will

on Monday, October 1, 1906. Entrance Examination on Wednesday and Thursday, September 26 and 27. These Courses include periods spent in commercial workshops, and extend over four years. They also prepare for the degree of B.Sc. in Engineering at the University of London. Fees, £15 or cu per annum.

Three Entrance Scholarships of the value of £32 each will be offered for competition at the Entrance Examination in Septeinber next.

TECHNICAL OPTICS. Full and part time Day Courses in all branches of this important department of applied science given in specially equipped laboratories and lecture

Full particulars as to sees, dates, &c., and all information respecting the work of the Institute, can be obtained at the Institute or on appr cation to

R. MULLINEUX WALMSLEY, D.Sc,

Principal.

rooms.

FACULTY OF MEDICINE.

| Professor ROBINSON, Dr. Yeates, Dr. Bar. Anatomy

LING, Mr. Haslam, Miss COGHILL, Mr.

BENNETT and Dr. EVANS. Physiology

Professor CARLIER and Dr. RHODES.

(Professor Leith, Dr. Lewis, Dr. Miller, Pathology and Bacteriology Mr. LEEDHAM-GREEN, Dr. STANLEY, Dr.

BARNES, Dr. HEWETSON and Dr. WILSON. Medicine

| Professor SAUNDBY, Professor CARTER and

Dr. RUSSELL.

Professor BARLING, Professor BENNETT May Surgery

and Mr. HEATON. Hygiene and Public Health Professor Bostock Hill and Dr. LYSTER. Therapeutics

Professor FOXWELL and Dr. Ports. Midwifery..

Professor MALINS and Dr. PURSLOW. Gynæcology.

Professor TAYLOR. Forensic Medicine...

Professor MORRISON. Mental Diseases.

Professor WHITCOMBE. Operative Surgery Professor JORDAN LLOYD. Ophthalmology

Professor PRIESTLEY SMITH. Materia Medica

Dr. CoolE KNEALE and Dr. GREENWOOD.

EAST LONDON COLLEGE,

MILE END ROAD, E.
(Close to Stepney Green Station, District Railway:)

NEW SESSION commences OCTOBER 1.
Pass and Honours Courses for London B.A., B.Sc., and B.Sc. (Engin-
eering).
Fee, Ten Guineas for the Session.
Classics...

F. R. EARI', M.A
English...

KATE WARREN.
French

MINA PAQUIER.
Mathematics

J. L. S. HATTON, M.A.
Physics ...

C. H. LEES, F.R.S.
Chemistry

J. T. HEWITT, D.Sc.
Botany ..

V. H. BLACKNAN, M.A.
Engineering

D. A. Low, M.I.M.E.
Electrical Engineering

J. T. MORRIS, M.LE.E.
Preparatory Class for boys of 15 years of age.
Calendar on application to the REGISTRAR, or

J. L. S. HATTON, M.A., Director of Studies

DEPARTMENT OF DENTISTRY.
Mr. HUXLEY.

Dr. STACEY WILSON.
Mr. HUMPHREYS.

Mr. MARSH.
Mr. DONAGAN.

Mr. MADIN.

Mr. PICKERILL. The SESSION 1906–7 COMMENCES OCTOBER 1, 1906. All Courses and Degrees are open to both Men and Women Students.

In the Medical School there is a separate Dissecting Room for Women with a qualified Woman Demonstrator.

Graduates and persons who have passed degree examinations of other Universities may, after two years' study or research, take a Master's Degree.

Syllabuses containing full information as to University Regulations, Lecture and Laboratory Courses, Scholarships, &c., will be sent on application to the SECRETARY OF THE UNIVERSITY.

ARMSTRONG COLLEGE,

NEWCASTLE UPON TYNE.

JOHNSTON CHEMICAL SCHOLARSHIP. This Scholarship (L60), tenable for one year, together with a Prize in Books to the value of £5, will be awarded on the result of an Examinatica in Chemistry with Crystallography or Mineralogy, to be held during the week commencing October 1, 1906.

Candidates, who must be Bachelors in Science of a British University of not more than three years' standing, are required to send in their names os or before September 20 to the undersigned.

F. H. PRUEN, Secretary ARMSTRONG COLLEGE.

NEWCASTLE UPON TYNE.

(IN THE UNIVERSITY OF DURHAM.) The Council invite applications for the post of LECTURER » MECHANICAL ENGINEERING. Stipend, 4300 per annum. Candi dates must send in six copies of their application and testimonials nor later than September 20, 1900, to the undersigned, from wbom further particular: may be obtairerl,

F. H. PRU'EN, Secretary

GUY'S HOSPITAL.

PRELIM. SCIENTIFIC (M.B. London.). The next Course of Lectures and Practical Classes for this Examination will begin on October 1. Full particulars may be obtained on application

PLATYSCOPIC LENS.

vacant.

JOHN BROWNING, Maren 78 STRAND, LONDON.

UNIVERSITY OF ST. ANDREWS.

BROWNING'S
RECTOR-ANDREW CARNEGIE, LL.D.
PRINCIPAL-JAMES DONALDSON, M.A., LL.D.
OPENING OF SESSION 1906-1907.
UNITED COLLEGE.

WITH LARGER ANGLES, INCREASED FIELD, AND (Arts, Science, and Medicine.)

IMPROVED DEFINITION.
This College will be formally opened on Friday, October 12, and the
Winter Session will begin on Monday, October 15.

The Preliminary Examinations, with which the competitions for Bursaries are combined, will commence on September 28. Schedules of application for admission will be supplied by the Secretary, and on being filled up may be received by him up to September 15.

There are forty Bursaries vacant (four of which are open to second year students and two to fourth year students only), ranging in value from 20 to £10. Of these twenty-one are tenable by men only, fourteen (which are restricted to students who intend to enter the Medical Profession) by * men only, and five (including, two Spence Bursaries of the value of £30 each the first year of tenure and £40 the second year, a Malcolm Bursary, restricted to Medical Students, of ihe annual value of £25 for five years,

Engraved Real Size. a Stepben Williamson Bursary of the value of about £40 for one year, and AN ACHROMATIC COMBINATION,

Smeaton Bursary of the value of about £20 for one year) by either men 6 women. A number of Presentation and Preference Bursaries are also COMBINING THE DEFINITION OF A MICROSCOPE WITH THE

PORTABILITY OF A POCKET LENS. Grants not exceeding tozo each may be assigned to students (men or uomen) during their fourth year who wish to take a Degree with Honours.

"If you carry a small Platyscopic Pocket Lens (which every

observer of Nature ought to do)."-GRANT ALLEN, in Knowledge. In the course of the Session nine Scholarships will be competed for, five

"I have long carried one of these instruments and found it of which are open to men or women. They range in value from £,80 to £50.

invaluable."- JOHN T. CARRINGTON, Editor of Science Gossip. ST. MARY'S COLLEGE.

The Platyscopic Lens is invaluable to botanists, mineralogists, (Divinity.)

or entomologists, as it focuses about three times as far from the This College will be opened on Monday, October 15. The Examinations object as the Coddington Lens, and has a field unequalled for f Bursaries will be held on October 12 and 13. Intimation of candidature fatness, allowing opaque objects to be examined easily. is not necessary. There are three competitive Bursaries vacant, ranging is value from 640 to £15. At the close of the Session one Scholarship of

It is made in four degrees of power, magnifying respectively £so, and one of £21, and one of £14, will be open to competition.

10, 15, 20, and 30 diams. ; the lowest power, having the largest The Classes are open to men or women Students, and include Latin, field, is the best adapted for general use. Greek, English, French, German, Hebrew, Aramaic and Syriac, Arabic, Assyrian, Logic and Metaphysics, Moral Philosophy, Political Philosophy, Mounted in Tortoiseshell, magnifying 10, 15, 20, or 30 s. d. P litical Economy, Education, Mathematics, Applied Mathematics, Natural Philosophy, Chemistry, Zoology, Botany, Geology, Agriculture

diameters, either power ...

15 0 od Rural Economy, History, Ancient History, Physiology, Anatomy, In Nickelised German Silver, either power

17 6 Military Subjects (Military History and Strategy, Tactics, Military Combinations of any iwo powers, in Tortoiseshell 276 Engineering, Military Topography and Reconnaissance, Military Law and Military Organisation), Systematic Theology, Biblical Criticism, and

Ditto Ditto in Nickelised German Silver 32 6 Church History.

ILLUSTRATED DESCRIPTION SENT FREE. Specimen Examination Papers and full

particulars respecting the Courses of lastruction, Fees, Examinations for Degrees, &c., will be found in the

Man'fg. mess JO

1Optician, and Sons, 45 George Street, Edinburgh.

ESTABLISHED 1765.
Specimen Examination Papers for the Preliminary and Bursary Compe-
tition Examinations are publisbed in separate booklets (Aris and Science
Preliminary Examination and Bursary Competition, is; Medical Pre-

ENGINEERING AND CHEMISTRY.
liminary Examination, 6d.), and may be had from the Secretary, or from
Messrs. Henderson, Books:llers, St. Andrews.

CITY AND GUILDS OF LONDON A general Prospectus for the coming Winter Session, as well as detailed if nation regarding any Department of the University, may be obtained

INSTITUTE. 19 application to the Secretary.

ANDREW BENNETT, Secretary. The Entrance Examinations to the Institute's Colleges are held in L'niversity of St. Andrews, August, 1906.

September. Particulars of the Entrance Examinations, Scholarships, Fees,
and Courses of Study, may be obtained from the respective Colleges, or
from the Head Office of the Institute, Gresham College, Basinghall
Street, E.C.
OITY AND GUILDS CENTRAL TECHNICAL COLLEGB.

(EXHIBITION ROAD, S.W.)
A College for higher Technical Instruction for Day Students not under
16 preparing to become Civil, Mechanical, or Électrical Engineers,
Chemical and other Manufacturers, and Teachers. The College is a

"School of the University of London " in the Faculty of Engineering. DIRECTOR :

Fee for a full Associateship Course, £30 per Session.

Professors :Professor Sir JAMES DEWAR, M.A., LL.D., D.Sc., F.R.S.

w.

M.A., B.Sc., SUPERINTENDENT OF THE LABORATORY :

Civil and Mechanical Engineering { WM. TRCDALBY,

M. Inst.C.E.
DR. ALEXANDER SCOTT, M.A., D.Sc., F.R.S.

Electrical Engineering

W. E. AYRTON, F.R.S., Past Pres.

Inst.E.E. This Laboratory was founded by Dr. Ludwig Mond, F.R.S., Chemistry

Į H. E. ARMSTRONG, Ph.D., LL.D., as a Memorial of Davy and Faraday, for the purpose of pro. Mechanics and Mathematics

F.R.S.

O. HENRICI, Ph.D., LL.D., F.R.S. moting, by original research, the development and extension of Chemical and Physical Science.

CITY AND GUILDS TECHNICAL COLLEGE, FINSBURY. Michaelma: Term.-Monday, October 1, to Saturday, December 15

(LEONARD STREET, City ROAD, E.C.) Leni Term.-Monday, January 7, to Saturday, March 23. Easter Term.- Monday, April 15, to Saturday, July 27,

A College for Intermediate Instruction for Day Students, preparing to

nter Engineering and Chemical Industries, and for Evening Students. Full Information and Forms of Application can be had from the

Fees, £20 per Session for Day Students. ASSISTANT SECRETARY, Royal Institution, Albemarle Street, W.

Professors :To prevent delay Candidates ought to send in their applications for Physics and Electrical Engineering { SEYANUS THOMPSON, D.Sc.,

F.R.S., Principal of the College af mission during the course of the Term preceding that in which they wish Mechanical Engineering and ( E. G. COKER, M.A., D.Sc., F.R.S.E.,

Mathematics

. M.Inst.M.E. Chemistry

R. MELDOLA, F.R.S., F.I.C.
KING'S COLLEGE, LONDON.

City and Guilds of London Institute,
UNIVERSITY OF LONDON.)

Gresham College, Basingball Street, E.C.
The Council invite applications for the post of ASSISTANT LEC-
FURER in PHYSICS. Salary, £150. Applications should be sent in
5 September 1. For conditions apply to

For other Scholastic Advertisements, see page cxxx, and
WALTER SMITH, Secretary.

pages ii and iii of Supplement.

THE DAVY-FARADAY RESEARCH LABORATORY

ROYAL INSTITUTION.

OF THE

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