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The “INCANDANODE” TUBE

(so called because it works all day with the Anode RED HOT). This Tube ran from 9 a.m. to 6 p.m. for five days at the Leicester meeting of the B.M.A. last July, The Anode was incandescent the whole time, but the Vacuum was fully maintained. One Tube will last for years. The Vacuum is easily adjustable THE BELOT SHIELD FOR X-RAY

WORKERS. MR. HALL EDWARDS (at the Leicester meeting of the B. M. A. last July) said of this shield :-" It is a scientific instrument designed on scientific lines, and overcomes all the objections which exist in the shields previously brought to my notice.” THE MEDICAL SUPPLY ASSOCIATION,

228 GRAY'S INN ROAD, LONDON, W.C.

Descriptive Circulars (with expert testimony) op application. INTENSIFIED

ASSOCT

Illustration

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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.

SPIN THARISCOPES.

(As devised by Sir WM. CROOKES.) Showing the Scintillations of Radium. Fitted with powersul 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.

PS See letter from Prof. Goich on "The Spinthariscope and Retinal Excitability” (NATURE, June 22, 1905, page 174), setting forth a valuable scientific application of the instrument. (15/- per lb. Thorianite

4/- per oz. Calcium Metal

11/3 per oz.

Radium Bromide from £16 per 5 mgs. A. C. COSSOR, 54 Farringdon Road,

Awarded Gold and

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

St. Louis Exhibition.

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THE

STIGMATIC LENS.

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SERIES II. F/6.
BRITISH DESIGN AND WORKMANSHIP.

Is the best All-round Lens for either Professional or Amateur use.
Each lens will give perfect definition with full aperture to the extreme corners of the plate
it is sold to cover ; with smaller stops it will cover at least two sizes larger, giving perfect sharp-
ness all over the plate, and thus becoming a wide-angle lens of the highest excellence. Either
combination may be used separately, giving foci of about Is and 2 times the length of that of
the lens when used intact. The advantage of thus being able to choose the best point of view,
irrespective of distance, will be at once apparent to the artistic worker.
EQUIVALENT TO FOUR LENSES AT THE PRICE OF ONE.

Eleven Sizes are now ready, from 34 to 18 inches eq. focus.
CATALOGUE OF HIGH-CLASS CAMERAS AND LENSES, POST FREE.

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J. H. DALLMEYER, Ltd., 25 NEWMAN ST., OXFORD ST.,LONDON,W.

MAKERS OF THE CELEBRATED DALLMEYER LENSES.
Frinied by RICHARD CLAY AND SONS, LIMITED), at ; Lieac Sureer hil, Queen Victoria Sucel, H. in: uit. o! JU , alu). by A.

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1

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Naturo trusts the mind which builds for aye."— WORDSWORTH.
No. 1917, VOL. 74)
THURSDAY, JULY 26, 1906

[PRICE 15 CENTS Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

REYNOLDS & BRANSON, Ltd., NEW PATTERN APPS-NEWTON PORTABLE COIL, Chemical and Scientific Instrument Makers to His Majesty's As supplied to the Indian Government, &c.

Government (Indian, Home, and Colonial).
Price

LABORATORY FURNISHERS and MANUFACTURING CHEMISTS.

£30 оо

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NEWTON & CO.,
Scientific Instrument Makers to H.M. the King and H.R.H. the

Prince ot Wales and the Government,
3 FLEET STREET, 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 Ápparatus, 350 pp. and 1200

Nlustrations, free on application.
DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS.

14 COMMERCIAL STREET, LEEDS.

NEGRETTI & ZAMBRA'S THERMOMETER

ANEROID
MAGNIFIERS.

BAROMETERS.

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38 Holborn Viaduct,

E.C. Branches

45 Cornhill;

6000

24

8000

7000

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ENGINEERING AND CHEMISTRY. CITY AND GUILDS OF LONDON

INSTITUTE. The Entrance Examinations to the Institute's Colleges are held in 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 Electrical Engineers, Chemical and other Manufacturers, and Teachers. The College is a “School of the University of London " in the Faculty of Engineering. Fee for a full Associateship Course, 630 per Session. Professors :

W. E. Civil and Mechanical Engineering

DALBY, {

M.A., B.Sc.,

M. Inst.C.E. Electrical Engineering {Wine. EAXERTON, F.R.S., Past Pres.

InstE.E. Chemistry

H. E. ARMSTRONG, Ph.D., LL.D.,

F.R.S. Mechanics and Mathematics

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

NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N. (Close to Holloway Stn., G.N.R., and Highbury Sin., 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.

.

...

ST. MARY'S HOSPITAL MEDICAL

SCHOOL,

PADDINGTON, W.

(UNIVERSITY OF LONDON.) The WINTER SESSION will begin on OCTOBER 1. The Medical School provides complete courses for the Medical Degrees of the Universities of London, Oxford, Cambridge, and Durbam ; for the Diplomas of M.R.C.S., L.R.C.P.; and for the Naval and Military Medical Services.

PRELIMINARY SCIENTIFIC (M.B. Lond.).—A complete Course of Chemistry, Physics, and Biology, under Recognised Teachers of the University, will begin on October 2.

SIX ENTRANCE SCHOLARSHIPS in Natural Science, value 4145 to 652 10s., will be competed for on September 24-26.

Calendar and full particulars on application to the Dean.

OITY AND GUILDS TBOHNICAL COLLEGE, FINSBURY.

(LEONARD STREET, City Road, E.C.) A College for Intermediate Instruction for Day Students preparing to enter Engineering and Chemical Industries, and for Evening Students. Fees, £20 per Session for Day Students.

Professors :Physics and Electrical Engineering {STERS.. Principal of the College.

SILVANUS P. THOMPSON, D.Sc., Mechanical Engineering and | E. G. Coker, M.A., D.Sc., F.R.S.E., Mathematics

M.Inst. M.E., A.M.Inst.C.E. Chemistry

R. MELDOLA, F.R.S., F.I.C. City and Guilds of London Institute,

Gresham College, Basinghall Street, E.C.

COACHING (THEORY AND

In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for MEDICAL EXAMS.

Especial Course of Instruction in THERAPEUTICS, PHARMA: COLOGY and MICRO Y for INSTITUTE OF CHEMISTRY EXAM,

Mr. FREDERICK DAVI8, The Laboratories, (Registered in Column B (Advanced Education). Teachers Registratio

Council, Board of Education, S.W.), 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C.

SOUTH-WESTERN POLYTECHNIC,

MANRESA ROAD, CHELSEA, S.W. The Day College Courses consist of 30 hours per week, and are in prepar: ation for London University degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemistry, Physics and Natural Science. Session Fee, £15

The Evening Classes consist of similar courses at much reduced rates.

The Technical Day Courses are arranged to extend over 3 years and prepare for Engineering, Electrical, Chemical and Metallurgical professions.

*S. SKINNER, M.A. Mathematics and Physics

W. H. Eccles, D.Sc. * J. LISTER, A.R.C.S.

L. LOwNDS, B.Sc., Ph.D. * J. B. COLEMAN, A.R.C.S.

J. C. CROCKER, M.A.
Chemistry and Metallurgy F. H. Lowe, B.Sc.

C. W. Hale.
W. E. OAKDEN.

* H. B. LACEY.
Botany

* T. G. HILL, A.R.C.S. Geology

* A. J. Maslen, F.L.S.

1: W. W. F. PULLEN, Wh.Sc. Mechanical Engineering

*A. MACKLOW SMITH.

H. AUGHTIE.

/* A. J. Makower, B.A. Electrical Engineering ...

U. A. OSCHWALD, B.A.

* B. H. Morphy. • Recognised Teacher of the University of London, Full prospectus from the Secretary, post free, 4d.; at the office, price id.

...

COUNTY OF LONDON. The London County Council invites applications for the under:mentioned posts of ASSISTANT TEACHERS in ordinary schools.

Applications must be made on Form 40, and addressed, as indicated in the advertisement, to the divisional correspondents, from whom copies of the form may be obtained. If a written application be made for a form, it must be marked outside " Application for Form 40," and must be accom panied by a stamped and addressed foolscap envelope or wrapper. County Electoral zirea

Dept.

Status. and School. WOOLWICH : Plum Lane.

B. ASST. MASTER, to teach

Practical Science. Applications for the above appointment to be sent to M., W. Buck, Divisional Offices, 2 Greenwich Road, S.E. County Electoral Area

Dept.

Status. and School. CLAPHAM: Wix's Lane.

B. ASST. MASTER, qualified

to take charge of laboratory and to teach all stages of

Physics and Chemistry Applications for the above appointment to be sent to Mr. W. I. RODGERS, Divisional Offices, Stockwell Road, S.W.

Candidates, other than successful candidates, invited to altend the Managers' meeting, will be allowed third-class return railway fare, but no other expenses.

Canvassing, either directly or indirectly, will be considered a disqualifcation.

G. L. GOMME,

Clerk of the London County Council. Education Offices, Victoria Embankment, W.C.

ARMSTRONG COLLEGE,

NEWCASTLE-UPON-TYNE.

(IN THE UNIVERSITY OF DURHAM.) The Council invite applications for the post of LECTURER in MECHANICAL ENGINEERING. Stipend, 6300 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

EGYPTIAN GOVERNMENT.

MINISTRY OF EDUCATION.
The following post at the School of Medicine, Cairo, is vacant :

ASSISTANT TO THE PROFESSOR OF CHEMISTRY.
The appointment is for two years, and may be renewel at the end of that
time. Applicants should forward copies of testimonials and such other
particulars as are mentioned below.

The 1 ay of the past is LE. 320 per annum, the Egyptian Pound being worth 6d more than the Pound Sterling.

Private Practice is not allowed.

It is to be distinctly understood that the appointment gives no claim to pension or indemnity.

The Government reserves to itself the right to dismiss the assistant for misconduct or incapacity.

In the Government Schools, as in all State Administrations in Egypt, Sunday is a working day. The Schools are closed on Fridays.

Leave will be granted on the same terms as to other Government Officials. The possibility of taking leave, and the period of the year at which it is granted, depend upon the exigencies of the service

Pay commences from date of arrival in Cairo. On taking up his duties in Cairo, the Assistant will receive one month's pay in lieu of passage money:

All applicants ould attach a certificate from a legally qualified medical
man, stating that in his opinion the candidate would pass as a first-class
life for insu ance purposes.
All applicants should state :

Their training and qualifications in Analytical Chemistry,
Their age,
What foreign languages they know, and

If they can be in Cairo by October 1.
The latest mail by which applications may be posted will leave London
on Friday, August 31. Applications to be addressed :-THE DIRECTOR,
Government School of Medicine, Cairo, Egypt.

THE VICTORIA UNIVERSITY OF

MANCHESTER.

SESSION 1906-7.
The SESSION will commence on TUESDAY, OCTOBER 2 next.

The following prospectuses may be obtained on application to the
RegistRAR :-)

Faculties of Arts and Science.
Faculty of Medicine.
Faculty of Law.
Faculty of Music.
Faculty of Commerce.
Faculiy of Theology.
Faculty of Technology.
Department of Education.
Department of Engineering.
Department of Mining.
Department of Architecture.
Advanced Studies in the Faculty of Arts.
Instruction in Military Subjects.
Dental Department.
Pharmaceutical Department.
Public Health and 'Veterinary State Medicine.
Fellowships, Scholarships, Exhibitions, &c.
Evening Classes and Popular Courses.

TO SCIENCE AND MATHEMATICAL

MASTERS.-September Vacancies. ---Graduates in Science and other well qualified Masters seeking posts in Public and other Schools should apply at once, giving full details as to qualifications, &c., to Messrs. GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice of all the best vacancies will be sent.

THE GOVERNMENT OF CEYLON

HARPER-ADAMS AGRICULTURAL require a LECTURER in PHYSICS and a LECTURER in CHEMISTRY for the Colombo Medical and Technical Colleges.

COLLEGE, Salary for each post, 6400, rising by annual increments of 625 to 2500 a ycar

NEWPORT, SALOP. The Government also require a SCIENCE MASTER for the Royal College, Colombo, to teach Chemistry and Physics for London Uni. LECTURER IN MATHEMATICS AND LAND.SURVEYING. versity Pass Examinations, including the Intermediate B.Sc. Salary, £350, rising to £450 by annual increments of £25.

Applications are invited for the above Lectureship on or before August 12. For the above appointments preference will be given to graduates in The Lecturer will be required to enter upon his duties on October 1, 1906. bonours of any British University, under the age of 35.

Full particulars can be obtained on application to ihe PRINCIPAL. Salaries are subject to a deduction of 4 per cent. as contribution to the

Widows' and Orpbans' Pension Fund. Free passages to the Colony. Leave and pension on same terms as to Salaries £400 to £500, £350 to £450, and other officers of the permanent service.

£300 to £400. 20 Science Graduates for Public Colleges, England Applications should be sent before August 15 to the Assistant PRIVATE SECRETARY, Colonial Office, S.W., and envelopes should be marked

and Abroad Also Woodwork vacancy, 6150. List of Science and with the name of the post applied for. Copies only of testimonials Mathematical Vacancies sent to all Candidates. (not more than six).

OR EL LA NA & CO. DARTFORD TECHNICAL can guarantee each candidate with good references an appointment. No

fee till suited.
INSTITUTE.

Estd. over 50 YEARS.
CHEMICAL DEPARTMENT.

80 WIGMORE STREET, LONDON, W. EVENING CLASSES. The Committee invite applications for the post of TEACHER of COACHING.-Gentleman with London CHEMISTRY (Theoretical and Practical), who may be required to give University diplomas in Applied Science wishes to coach gentlemen instruction on four evenings per week for about three hours per evening.

reading for examinations in mathematics, electrical and mechanical

engineering, and allied subjects, at their own residence or place agreed Salary. £go per Winter Session of about 30 weeks.

upon. Apply by letter to · EQUATION," c/o Smith's News Agency, Applications should be forwarded not later than August 11 to Mr. D. F.

Worcester Brow, Technical Institute, Dartford, Kent, from whom further particulars may be obtained.

Experienced Lecturer, young, tall, wishes

for engagement round Birmingham or Worcester for the following UNIVERSITY OF BIRMINGHAM.

subjects :-Mathematics, Electrical Engineering, and Applied Physics. Apply by letter EQUATION," c/o Smith's

News Agency, LECTURER IN ZOOLOGY.

Worcester. The Council invites applications for the appointment of LECTURER in ZOOLOGY

For other Scholastic Advertisements, see page cx. Stipend, 4150 per annum.

Particulars and conditions of the appointment may be obtained on application to the SECRETARY. Applications, giving particulars as to qualifications and experience, with

For Sale, a unique Collection of Minerals, six copies of recent testimonials, must be sent to the SECRETARY on or some 300 specimens, and catalogue. Can be seen by appointment. – before July 31, 1906.

Address W. TRURAN, 168 Richmond Road, Dalston, London, N.E. GEO. H. MORLEY, Secretary.

to

UNIVERSITY COLLEGE OF SOUTH
WALES AND MONMOUTHSHIRE,

CARDIFF
The Council of the College invites applications for the post of DE-
MONSTRATOR and ASSISTANT LECTURER in BOTANY.

Further particulars may be obtained from the undersigned, by whom applications with testimonials (which need not be printed) must be received on or before Saturday, September 1, 1906.

J. AUSTIN JENKINS, B.A , Registrar.

PROTECTION from MOSQUITOES

AND OTHER INSECTS. ARMBRECHT'S PYRETHRUM. Ten drops to a tablespoonful of water and sponged over expound

parts prevents insects from biting for about T 2s. 9d. a Bottle post free inland ; Ss. 9d. to all

ARMBRECHT, NELSON & CO. 71 & 73 DUKE STREET, GROSVENOR SQU

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THE PHILIPPINE JOURNAL OF

SCIENCE. Published by the Bureau of Science of the Philippine Islands.

The organ for the scientific research of the Bureau of Science and of other investigators in the Philippine Islands. Ten numbers a year and botanical supplements. Subscription price $5.00 U.S. Currency. Manila Agent,

London Agent, THE DIRECTOR OF PRINTING, Messrs. WILLIAM WESLEY & SON, Manila, P.I

28 Essex Street, Strand. FOREIGN SCIENTIFIC BOOKS

supplied quickly and cheaply. References in principal towns at home and abroad.

Catalogue of standard and recent works post free. W. MULLER,

16 Grape St., New Oxford St.,

LONDON.

Fortin's Standard Barometers; Maximum Standard Thermometers ; Minimum Standard Thermometers; Hygrometers; Earth Thermometers ; Sunshine Recorders: Rain Gauges ; Self-registering Rain Gauges : Self-recording Rain Gauges, Barometers, Thermometers; Anemometers ; &c., &c., &c. MAY BE OBTAINED THROUGH ANY OPTICIAN.

IF Illustrated Price List Post Free, ESTBD. 1753.

CONTRACTORS TO H.M. GOVT. Telephone : 1981 Holborn. Telegrams: Rapkin, London, N.B.-If any difficulty in obtaining our instruments from your

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