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THE GAIFFE AUTO-MOTOR
MERCURY JET INTERRUPTER

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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 interrupter are electrically and mechanically linked together. Kuns 500 working hours without requiring attention.

See NATURE, July 20. 1905, page 277.

The leading experts have reported in terms of the highest praise upon this Break after continuous use (ride 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 motor of any voltage up to 250. Requires only 2 lbs. of mercury, and is simplicity itself for cleaning.

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The "CALDWELL" ELECTROLYTIC INTERRUPTER.

Will work on direct or alternating circuits from 50-250 volts without interposing any resistance. Current adjusted by rack and pinion movemen', giving perf. ct regulation with any tube. No expensive platinum parts to replice.

Price

£3 10 0

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

Gold and Silver Medals awarded at St. Louis Exhibition.

INTENSIFIED

Telephone: 10547 Ce iral.

INDUCTION COIL.

Specially designed for X-Ray Work, &c.

FULL PARTICULARS ON REQUEST TO

W. WATSON & SONS,

313 High Holborn,

London, W.C.

AND AT

Edinburgh & Birmingham.

ACCOSSOR
LONDON

DALLMEYER'S TELE-PHOTO. LENSES & ATTACHMENTS

DALL MEYERS PATENT
STIGMATIC LENS

MODERATE POWER
TELE-PHOTO

ATTACHMENT
PATENT

Stigmatic Lens fitted with Tele-Photo. Attachment.

Enable you to take Photographs of Distant or Inaccessible
Subjects of sufficient size to be of practical value.
Indispensable for use in all departments of Natural
History Field Work (especially Ornithology), and also
to Architects.

Price from £3 15s.

Prices and Particulars on application. Estimates and advice free.

J. H. DALLMEYER, Ltd.,

25 Newman Street, London, W.,

MAKERS OF

THE CELEBRATED DALLMEYER LENSES.

(These Attachments can be fitted to any good Lens.) Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Lread Street Hill, Queen Victoria Street, in the City of London, and puolished by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W. C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, August 2, 1306.

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NATURE

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

"To the solid ground

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MAGNIFIERS.

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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.

NEGRETTI & ZAMBRA'S

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inch

GRIFFIN LONDON

When ordering state diameter of Thermometer.

Compemated

NEGRETTI&ZAMBRA
LONDON

20083

in thickness, for the

vest pocket.

Illustrated PRICE LIST

of this and other

Aneroid Barometers free by post

on application to

JOHN J. GRIFFIN & SONS, Ltd., NEGRETTI & ZAMBRA,

KINGSWAY, LONDON.

38 HOLBORN VIADUCT, LONDON, E.C. Branches-45 Cornhill and 122 Regent Street.

UNIVERSITY OF BIRMINGHAM.

Mathematics

Physics

Chemistry

Zoology

Botany

FACULTY OF SCIENCE.

Geology and Geography

Mechanical Engineering Civil Engineering Electrical Engineering

Metallurgy Mining

Brewing..

(Professor HEATH, Mr. PREECE, Mr. McLAREN and Mr. GRIFFITH.

(Professor POYNTING, Mr. SHAKESPEAR, Dr. BARLOW and Dr. DENNING.

(Professor FRANKLAND, Dr. FINDLAY, Dr. MCCOMBIE, Dr. MURRAY and Mr. TINKLER. Professor BRIDGE and Mr. COLLINge. Professor HILI.HOUSE and Mr. WEST. (Professor LAPWORTH, Dr. GROOM and Mr. RAW. (Professor BURSTALL, Mr. PORTER, Mr. HAZEL, Mr. GILL and Mr. SINCLAIR. Professor DIXON, Mr. HUMMEL and Mr. BAIN. Professor KAPP, Dr. MORRIS, Mr. KIPPS and (vacant).

(Professor TURNER, Mr. HUDSON and Mr. LEVY.

Professor REDMAYNE, Mr. BORLASE and Mr.
BRIGGS.

Professor BROWN, Mr. POPE and Mr.
ROBOTTOM.

FACULTY OF ARTS.

(Professor SONNENSCHEIN, Mr. CASPARI and Mr. CHAMBERS.

(Professor CHURTON

MACMILLAN.

COLLINS and Mr.

Professor FIEDLER and Dr. SANDBACH. (Professor BEVENOT, Monsieur DEMEY and (vacant).

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FACULTY OF COMMERCE.

Commerce
Finance

Accounting

Commercial Law. Spanish and Italian

Professor MUIRHEAD and Miss WODEHOUSE. Professor MASTERMAN and Miss SIDGWICK. Professor HUGHES.

Professor SIR EDWARD ELGAR.

Professor ASHLEY.

Professor KIRKALDY.

Professor DICKSEE.

Mr. TILLYARD.

Senor DE ARTEAGA.

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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

NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N.

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

Day and Evening Courses in the above under recognised teachers inMATHEMATICS,

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.

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 Entrance Examination on commence on Monday, October 1, 1906. These Courses include Wednesday and Thursday, September 26 and 27. 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 11 per annum.

Three Entrance Scholarships of the value of £52 each will be offered for competition at the Entrance Examination in September 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

rooms.

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

cation to

EAST

R. MULLINEUX WALMSLEY, D.Sc.

LONDON

Principal.

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...
English...
French ..
Mathematics
Physics...
Chemistry

Botany

Engineering

Electrical Engineering

F. R. EARP, M.A.
KATE WARREN.
MINA PAQUIER.

J. L. S. HATTON, M.A.
C. H. LEES, F.R.S.
J. T. HEWITT, D.Sc.
V. H. BLACKMAN, M.A.
D. A. Low, M. I. M.E.
J. T. MORRIS, M.I.E.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.

ARMSTRONG COLLEGE,

NEWCASTLE-UPON-TYNE.

JOHNSTON CHEMICAL SCHOLARSHIP.

This Scholarship (60), tenable for one year, together with a Prize in Books to the value of £5, will be awarded on the result of an Examination 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 on 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 in MECHANICAL ENGINEERING. Stipend, £300 per annum. Candi dates must send in six copies of their application and testimonials not later than September 20, 1906, to the undersigned, from whom further particulars may be obtaired,

F. H. PRUEN, Secretary

UNIVERSITY OF ST. ANDREWS.

RECTOR-ANDREW CARNEGIE, LL.D.
PRINCIPAL-JAMES DONALDSON, M.A., LL.D.
OPENING OF SESSION 1906-1907.

UNITED COLLEGE.

(Arts, Science, and Medicine.)

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 £40 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 women 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 the annual value of £25 for five years, a Stephen Williamson Bursary of the value of about £40 for one year, and a Smeaton Bursary of the value of about £20 for one year) by either men or women. A number of Presentation and Preference Bursaries are also

vacant.

Grants not exceeding £20 each may be assigned to students (men or nomen) during their fourth year who wish to take a Degree with Honours. In the course of the Session nine Scholarships will be competed for, five of which are open to men or women. They range in value from £80 to £50. ST. MARY'S COLLEGE.

(Divinity.)

This College will be opened on Monday, October 15. The Examinations for Bursaries will be held on October 12 and 13. Intimation of candidature is not necessary. There are three competitive Bursaries vacant, ranging in value from £40 to £15. At the close of the Session one Scholarship of £50, and one of £21, and one of £14, will be open to competition.

The Classes are open to men or women Students, and include Latin, freek, English, French, German, Hebrew, Aramaic and Syriac, Arabic, Assyrian, Logic and Metaphysics, Moral Philosophy, Political Philosophy, Political Economy, Education, Mathematics, Applied Mathematics, Natural Philosophy, Chemistry, Zoology, Botany, Geology, Agriculture and Rural Economy, History, Ancient History, Physiology, Anatomy, Military Subjects (Military History and Strategy, Tactics, Military Engineering, Military Topography and Reconnaissance, Military Law and Military Organisation), Systematic Theology, Biblical Criticism, and Church History.

Specimen Examination Papers and full particulars respecting the Courses

BROWNING'S

PLATYSCOPIC LENS.

WITH LARGER ANGLES, INCREASED FIELD, AND
IMPROVED DEFINITION.

Engraved Real Size.

AN ACHROMATIC COMBINATION. COMBINING THE DEFINITION OF A MICROSCOPE WITH THE PORTABILITY OF A POCKET LENS.

"If you carry a small Platyscopic Pocket Lens (which every observer of Nature ought to do)."-GRANT ALLEN, in Knowledge. "I have long carried one of these instruments and found it invaluable."-JOHN T. CARRINGTON, Editor of Science Gossip. The Platyscopic Lens is invaluable to botanists, mineralogists, or entomologists, as it focuses about three times as far from the object as the Coddington Lens, and has a field unequalled for flatness, allowing opaque objects to be examined easily.

It is made in four degrees of power, magnifying respectively 10, 15, 20, and 30 diams.; the lowest power, having the largest field, is the best adapted for general use.

Mounted in Tortoiseshell, magnifying 10, 15, 20, or 30
diameters, either power...

In Nickelised German Silver, either power
Combinations of any two powers, in Tortoiseshell
Ditto Ditto in Nickelised German Silver

s. d.

15 O

17 6

27 6

...

32 6

ILLUSTRATED DESCRIPTION SENT FREE.

of Instruction, Fees, Examinations for Degrees, &c., will be found in the JOHN BROWNING, Man'fg.

CALENDAR OF THE UNIVERSITY, published by Messrs. William Blackwood and Sons, 45 George Street, Edinburgh.

Specimen Examination Papers for the Preliminary and Bursary Competition Examinations are published in separate booklets (Arts and Science Preliminary Examination and Bursary Competition, 1s.; Medical Preliminary Examination, 6d.), and may be had from the Secretary, or from Messrs. Henderson, Books:ilers, St. Andrews.

A general Prospectus for the coming Winter Session, as well as detailed infomation regarding any Department of the University, may be obtained application to the Secretary.

ANDREW BENNETT, Secretary.

University of St. Andrews, August, 1906.

THE DAVY-FARADAY RESEARCH LABORATORY

OF THE

ROYAL INSTITUTION.

DIRECTOR:

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

SUPERINTENDENT OF THE LABORATORY:

DR. ALEXANDER SCOTT, M.A., D.Sc., F.R.S. This Laboratory was founded by Dr. Ludwig Mond, F.R.S., as a Memorial of Davy and Faraday, for the purpose of promoting, by original research, the development and extension of Chemical and Physical Science.

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Civil and Mechanical Engineering {
Electrical Engineering
Chemistry

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W. E. DALBY,
M. Inst.C.E.

M.A., B.Sc.,

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

H. E. ARMSTRONG, Ph.D., LL.D.,
F.R.S.

Michaelmas Term.-Monday, October 1, to Saturday, December 15
Lent Term.-Monday, January 7, to Saturday, March 23.
Easter Term.-Monday, April 15, to Saturday, July 27.

Full Information and Forms of Application can be had from the
ASSISTANT SECRETARY, Royal Institution, Albemarle Street, W.

To prevent delay Candidates ought to send in their applications for
admission during the course of the Term preceding that in which they wish

to enter.

KING'S COLLEGE, LONDON.
(UNIVERSITY OF LONDON.)

The Council invite applications for the post of ASSISTANT LEC
FURER in PHYSICS. Salary, £150. Applications should be sent in
15 September 1. For conditions apply to
WALTER SMITH, Secretary.

Mechanics and Mathematics

O. HENRICI, Ph.D., LL.D., F.R.S.

CITY AND GUILDS TECHNICAL COLLEGE, FINSBURY.

(LEONARD STREET, CITY ROAD, E.C.)

A College for Intermediate Instruction for Day Students preparing to nter Engineering and Chemical Industries, and for Evening Students. Fees, £20 per Session for Day Students.

Professors:

SILVANUS P. THOMPSON, D.Sc.,

Physics and Electrical Engineering
Mechanical
Mathematics
Chemistry

F.R.S., Principal of the College.
Engineering and (E. G. COKER, M.A., D.Sc., F.R.S.E.,
M.Inst. M.E.

R. MELDOLA, F.R.S., F.I.C.

City and Guilds of London Institute,
Gresham College, Basinghall Street, E.C.

For other Scholastic Advertisements, see page cxxx, and
pages ii and iii of Supplement.

TELESCOPE & SCALE.

Fully adjustable. Scale can be set horizontally or vertically. Telescope has 25 m/m achromatic Objective.

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CAMBRIDGE SCIENTIFIC

INSTRUMENT COMPANY

Price, with Iron Stand

£3 17 6

Brass Stand ...

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£4 2 6

IMMEDIATE DELIVERY.

The Cambridge Scientific Instrument Co., Ltd.,

CAMBRIDGE, ENGLAND.

"TECHNICAL" SERIES of PHYSICAL APPARATUS.

Prof. HARTL'S

OPTICAL DISC

and

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CARL ZEISS, JENA.

BRANCHES :

LONDON-29 Margaret Street, Regent Street, W.
Berlin. Frankfort o/M. Hamburg. Vienna. St. Petersburg.

Palmos Cameras

POLARISING APPARATUS,

covering all the important
experiments in
LIGHT.

See NATURE, Aug. 2, page 338.

Send for Illd. Descriptive Pamphlet (including instructions for working) fost free from the Sole Agents for U.K. and Colonies.

A. GALLENKAMP & CO., Ltd., 19 & 21 SUN STREET, FINSBURY SQUARE, LONDON, E.C.

RADIUM ON HIRE.

(Activity 1,800,000 units.)
Fluorescent Screen, Electroscope, &c., and
Lantern Slides suitable for Lectures.
Radium Pendant Microscope with Radium, 2/6
Scintilloscope, full size, 7,6

Self-Luminous Radium Screen, 5/-
Certificates of Radio-activity, 5/- each sample.
Electroscopes for the Lantern, 7/6

Post free within United Kingdom.

F. HARRISON GLEW, Patentee, 156 Clapham Road,

WITH FOCAL PLANE

SHUTTER.

MADE OF LIGHT METAL.

Fitted with ZEISS LENSES.

SIZES:-6x9 and 9x12 cm., and 31-in. X4-in. and 5-in. X4-in. Also 9X 12 and 9x 18 cm. for Stereo and Panorama. SUITABLE FOR PLATES, PACK FILMS, ZEISS PACK-SLIDES AND ROLL FILMS. Illustrated Catalogue, "Pn," Post Free on application.

AN INTERESTING INSTRUMENT.

29123

Change

BANICON

PATERT

THE NEW

1/6th scale.

"DIAL" BAROGRAPH,

or Self-Recording Barometer.

This is a most useful instrument, and fills a long felt want. It makes at inte esting record of Barometri: Variations, and at the same time read. V shows (by means of the Dial) the present height of the Barometer. We guarantee the reliability of the readings obtained, both past and present The Instrument is of the very best workmanship throughout, and is com pensated for temperature. The Recording Arm and the Dial Hand working by means of our Special Attachment off the same movement, a simultaneous action is there) y assured. Price, com; lete in handsome sol oak, walnut, or mahogany case, with one year's supply of Charts, Ink, and Instructions, £6 15s.

MAY BE OBTAINED THROUGH ANY OPTICIAN

Sole
Manufacturers:

PASTORELLI & RAPKIN, Ltd.

(Established 1750),

Contractors to H.M. Government,
46 HATTON GARDEN, LONDON, E.C.
Telephone No. 1981, Holborn. Telegrams-"Rapkin, London
ACTUAL MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS.
Illustrated Price List Post Free.
N B.-If any difficulty in obtaining our instruments from your Dealer.

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