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LABORATORY RHEOSTATS.

A NEW
EUDIOMETER

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(WILSON'S PATENT).

This Eudiometer is
peculiarly adapted for the

demonstration of :-
(a) The volume changes of K

interacting gases. CHEAPEST and MOST USEFUL FORM of RESISTANCE (b) Boyle's Law (pressures FOR EXPERIMENTAL WORK ON THE MARKET.

above and below atmoTo regulate PRESSURE and CURRENT, series or shunt, and a variety of other laboratory resistances.

spheric). ILLUSTRATED LIST OF RHEOSTATS

(C) Charles' Law. (covering various patterns) post sree.

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CLASS APPARATUS REQUIRING REPAIR,
INSTRUCTIONS FOR RENEWAL,

and
SPECIAL BLOWING WORK,

before the vacation,

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so that such may be carried out without haste, and delivered in good time for the

opening of the new session.

The Stereoscopic New "Focal Plane Standard" is the smallest practical Camera made fitted with a Shutter giving expo

sures up to 1/1000 of a second, and adapted for using daylight loading spools.

Price complete in Morocco case 40

and fitted with Series III Goerz lens for pictures 41 by 31

£15 : 0 : 0 The Ideal Camera for instantaneous

photographs, and equally suitable for

other kinds of work. Write for CATALOGUE 12a, free from The LONDON STEREOSCOPIC COMPANY,

106 & 108 Regent Street, W., or 54 Cheapside.

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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

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Naturo trusts the mind which builds for aye."-WORDSWORTH.
No. 1914. VOL. 74)
THURSDAY, JULY 5. 1906

[PRICE 15 CENTS Registered as a Newspaper at the General Post Office. 1

(All Rights are Reserved. REYNOLDS & BRANSON, Ltd.,

Chemical and Scientific Instrument Makers to His Majesty's New Cheap Pattern.

Government (Indian, Home, and Colonial). LABORATORY FURNISHERS and MANUFACTURING CHEMISTS.

APPS-NEWTON INDUCTION COILS.

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PRACTICAL NOTES ON
TELEPHOTOGRAPHY,

Free on application to
R. & J. BECK, Ltd., 68 CORNHILL, LONDON.

Illustrated Price List and full particulars post free on

application 10 NEGRETTI & ZAMBRA,

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

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SEPTEMBER MATRICULATION. BIRKBECK

Day and Evening Classes for the September Matriculation of London University may be taken up at any time, as the Classes at

UNIVERSITY TUTORIAL COLLEGE

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COLLEGE, BREAMS BUILDINGS, CHANCERY LANE, E.C.

FACULTY OF SCIENCE. DAY AND EVENING COURSES, under Recognised Teachers of

the University of London.

(Alex. McKenzie, Ph.D., D.Sc, Chomistry

M.A.
TH. Wren, Ph.D., B.A.. B.Sc.

ALBERT GRIMITHS, D.Sc.
Physics ...

D. OWEN, B.A., B.Sc.

B. W. Clack, B.Sc.
Mathematics

(E. H. SMART, M.A.
(c. v. Coates, M.A.

A. B. RENDLE, M.A., D.Sc. Botany

{f. E. FRITSCH, Ph.D., D.Sc. Zoology..

H. W. UNTHANK, B.A.B.Sc. Geology & Mineralogy Geo. F. HARRIS, F.G.S. Assaying, Metallurgy & Mining. Geo. PaTCHIN, A.R.S.M. RESEARCH in Chemistry and Physics in well-equipped laboratories

French, German, Spanish, Russlan, and Italian Classes. EVENING CLASSES in Biology, Physiology, Practical Geometry, Building and Machine Construction. Theoretical Mechanics, Applied Mechanics and Mechanism, Land and Quantity Surveying.

Calendar 6d. (post free 8d.), on application to the SECRETARY.

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work continuously through the Summer vacation. Fifty-two successes at January Matriculation.

Classes in PRACTICAL CHEMISTRY, PHYSICS, BIOLOGY AND GEOLOGY are held during August.

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Prospectus may be had, post free, from the Vice-PRINCIPAL, University Tutorial College, Red Lion Square, Holborn.

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 pre. pare 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, AR.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.

W. W. F. PULLEN, Wb.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.

BEDFORD COLLEGE FOR WOMEN.

(UNIVERSITY OF LONDON.)

YORK PLACE, BAKER STREET, W. The College provides instruction for Students preparing for the Uni. versity of London Degrees in Arts, Science, and Preliminary Medicine, also instruction in subjects of General Education.

There is a Training Department for Teachers, a Hygiene Department and an Art School. Students can reside in the College. DEPARTMENT FOR PROFESSIONAL TRAINING IN

TEACHING. Head of the DeparTMENT-Miss Mary MORTON, M.A. Students are admitted to the Training Course in October and in January

The Course includes full preparation for the exarr.inations for the Teach ing Diplomas granted by the Universities of London and Cambridge, held annually in December.

Full particulars on application to the PRINCIPAL.

UNIVERSITY COLLEGE,

NOTTINGHAM.

RESEARCH SCHOLARSHIP, The Council of the University College, Nottingham, offer a SCHOLARSHIP for Scientific Research, tenable for one year, of the value of £5a, together with free admission to the College, open to any graduate of a British University.

Candidates will be required to give evidence of suitable training and capacity for conducting an original research. The successful candidate will be required to devole himself to some subject of research to be approved by the Senate.

Applications to be sent in not later than September 1, 1906, on forinis which may be obtained from the REGISTRAR.

It is intended to award a similar Scholarship in December. Applications by December 15

B.A. AND B.Sc. EXAMS.

MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE (Residence abroad as impediment) or ORAL TUITION on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based on success.

The STAFF includes Graduates of Oxford, Cambridge, London, and Royal Universities, Science Medallists, Prizemen, Scholars, &c.

SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, Psychology, Political Economy, Latin, Greek, French, German, &c.

For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oxon.), Burlington Correspondence College, Clapham Common, London, S.W.

THE VICTORIA UNIVERSITY OF MANCHESTER . The Council is about to appoint to a VULCAN FELLOWSHIP in MECHANICAL and ELECTRICAL ENGINEERING, which is open to University Graduates only. Value 6120. The detailed conditions or the appointment may be obtained from the REGISTRAR. LECTURES on VESUVIUS, illustrated by

a unique series of slides taken during many years' residence, including many of the recent eruption, can be given during the autumn by Dr. JOHNSTON-Lavis, late Prof. of Vulcanology in the R. Univ. of

Naples.--Address, Villa Minima, Vinel, Vosges, France. TO SCIENCE AND MATHEMATICAL

MASTERS.-Required (1) Mathi. Master with good degree to teach Maths, up to Scholarship standard. Salary, £180, non-res., Public School (2) Science Master for Secondary School; chief subject, Physics. £.150, non-res. 13) Graduate for Mathematics ; cricketer desired. £100, resident, or £130, non-res.- For particulars of the above, address GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand, London. Many other vanabits for Science, Mathl. and other Masters in important Schools. CAMBRIDGE UNIVERSITY DAY

TRAINING COLLEGE. The post of ASSISTANT LECTURER in EDUCATION in this College is vacant by the appointment of R. L. ARCHER, M.A., to the Professorship of Education at Bangor. Candidates, who must have taktı an Honours Degree either at Cambridge or Oxford, and must be competent to supervise teaching in school, should apply to the Principal, OMAR BROWNING, M.A., King's College, Cambridge, for information as to the details of the work and the remuneration. Applications will be received up to July 31. For other Scholastic Advertisements, see page lxxxiii, and

page ii of Supplement,

UNIVERSITY OF LONDON. THE “BROWN” ANIMAL SANATORY INSTITUTION

(Under the Goernment of the l'niversity). Notice is hereby given that, in accordance with the Will of Mr. Brown, a course of Five Lectures will be delivered by the Professor-Superintendent (Prof. T. GREGOR BRODIE, M.D., B.Sc., F.R.S.) in the Physiological Laboratory of the University of London, South Kensington, S.w., on July 9, 11, 13; 16 and 18. at 5 o'clock each afternoon. Subject : "The Secretion of Urine under Normal and under Pathological Conditions." The lectures are free to the public.

By Order of the Senate,

PERCY M. WALLACE, Secretary to the Senate, June 20, 1906.

University of London. Wanted for September next, a Science

MASTER-Graduate-with considerable experience in preparing for the Cambridge Local Examinations. --Apply to the Head Master, King Edward's School, Bath.

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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 Educati in. Masters to begin work in October, in Cairo or Alexandria, and to teach in English exclusively. Over 400 boys in each School, mainly Mohammedans. In the case of two of the Masters now required, the subject mainly essential is Science (Experimental Physics and Chemistry); six of the new Masters will be principally eng ged in teaching, Mathematics; the others will be concerned more particularly with the teaching of English, including History and Geography. Candidaies should be not less than 23 nor over 30 years of age, have a robust con. stitution, and have taken a University Degree in Honours. They should have experience as teachers : preference will be given 10 applicants who hold a Diploma in Teaching. Salary £295 per annum (£Eg.24 per mensem), rising to £393 per annum (£Eg.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.

Applications, with full statement of qualifications and accompanied by copies only of testimonials, must be sent in before July 17, 1906, marked ouiside “ Assistant-Masterships," and addressed to H. J. BYD CARPENTER, Esq., Senior Inspector, Ministry of Education, 19 Woourn Square, London, W.C., to whom candidates may apply for further information.

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Applications should be made on the official form, to be obtained from the CiE K OF THE LONDON COUNTY COUNCIL, Education Offices, Victoria Embankment, W.C., to whom they must be returned not later than 10 a.m. co July 7, 1906.

Candidares applying through the post for the form of application should endose a stamped and addressed envelope.

Candidates other than successful candidates, invited to attend the Com. mittee, will be allowed 3rd class return railway fare, but no other expenses.

Canvassing for these posts, either directly or indirectly, will be considered a disqualification.

G. L. GOMME,

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

COUNTY COUNCIL OF THE WEST RIDING OF YORKSHIRE.

EDUCATION DEPARTMENT.

SECONDARY SCHOOLS. The West Riding Education Committee will require in September the services of:

ONE ASSISTANT MASTER to teach English Subjects, French and Geography. Salary, 6140 per annum.

ONE ASSISTANT MISTRESS to teach English Subjects, Singing, Needlework and Drill. Salary: £100 per annum.

ONE ASSISTANT MISTRESS to teach Mathematics and Latin. Salary, £120 per annum.

ONE ASSISTANT MISTRESS to teach English Composition, History and Physical Exercises or Class Singing. Salary, 100 per annum.

ONE ASSISTANT MISI RESS to teach Junior and Kindergarten Subjects. Salary, £100 per annum.

ONE ASSISTAN I MISTRESS to teach English, Class Singing and Drawing. Salary, 6100 per annu'n.

Applications for these posts must be made on forms to be obtained from the Education Depariment (Secondary), County Hall, Wakefield, where they must be returned not later than Monday, July 16, 1906. Copies of not more than three recent testimonials must be sent with the application.

Canvassing will be a disqualification.

COUNTY OF LONDON. Tbe I ondon County Council invites applications for appointment to the puse Of TEACHER of CHEMISTRY in the L.C.C. Paddington Technical Institute. The commencing salary attaching to the post will be $150 per anaja, and the succes ful candid te will be ri quired to give lectures and conduct practical classes, day and evening, in Cheminery. Applicants should possess University qualifications and have worked in a good labora. tory. Experience in technical work and class teaching is desirable.

App'ications should be made on the official form to be obtained from the CERN OF THE LONDON COUNTY COUNCIL, Education Offices, Victoria En arkment, W.C., to whom they mu-t be returned not later than 10 a.m. 00 Tue-day, July 17, 1906, accompanied by copies of three testimonials of retot date.

Candidates applying through the post for the form of application should close a stamped and addressed envelope.

Landidare, other han successful candidates, invited to attend the Committee, will be allowed third-class return ailway fare, but no other expenses.

Canvassing, either directly or indirectly, will be considered a disqualifi. cation.

G. L. GOMME,

Clerk of the London County Council. Education Offices, Victoria Embankment, w.c.

COUNTY COUNCIL OF THE WEST

RIDING OF YORKSHIRE.
EDUCATION DEPARTMENT.

HIGHER EDUCATION. The West Riding Education Committee require the services of an ORGANISING MASTER, qualified in Science and Mathematics, for the purpose of taking Courses of Instruction for groups of Elementary Teachers (Uncertificated and Supplementary), and of undertaking some teaching in Secondary Schools. Salary, £200 per annum.

Applications must be made on Forms to be obtained from the Education Department (Secondary). County Hall, Wakefield, where they must be returned not later than July 18, 1906. Copies of not more than three recent testimonials must be sent with the application.

Canvassing will be a disqualification.

EGYPTIAN GOVERNMENT.

HARTLEY UNIVERSITY COLLEGE,

SOUTHAMPTON. Principal S. W. RICHARDSON, D.Sc. (Lond.). The Council invite applications for the appointment of ASSISTANT LECTURER in PHYSICS. Salary, £150, rising to 6200 per Annum.

Particulars and conditions of the appointment may be obtained on application to the REGISTRAR,

Applications, giving particulars of age, training, qualification, and experience, with three copies of recent testimonials, must be sent to the PRINCIPAL on or before July 12, 1906.

D. KIDDLE, Registrar.

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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 renewed at the end of that time: Appricants should forward copies of testimonials and such other particolari as are mentioned below.

The : ay of the post is {E.320 per annum, the Egyptian Pound being sorth more than the Pound Sterling.

Private Practice is not allowed.

It is to be distinctly understood that the appointment gives no claim to pension of 19demnity

The Government reserves to itself the right to dismiss the assistant for riscaduci a incapacity.

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

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

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

All applicants should attach a certificate from a legally qualified medical an, stating that in his opinion the candidate would pass as a first-class e fus insu.ance purpo.es. Al applicants sbould state :

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

If they can be in Cairo by October 1.
The last mail by whicb applications may be posted will leave London
Friday, August 3:

Appleations to be addressed :-THE DIRECTOR,

TECHNICAL COLLEGE OF

SUNDERLAND.

CHEMISTRY DEPARTMENT. The Governors invite applications for the post of ASSISTANT LEC. TURER and DEMONSTRATOR in CHEMISTRY. The appointment will date from September 16, 1906 ; the salary will be at the raie of £120 per annum, rising by yearly increments of £10 10 £150.

Further particulars may be obtained from the SECRETARY, to whom applications for the appointment should be sent not later than August 6.

T. W. BRYERS, Secretary. Education Offices. Sunderland. For other Scholastic Advertisements, see page lxxxii, and

Their age,

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A NEW PATTERN

FORTIN'S
STANDARD BAROMETER

(Registered Design No.420,297.) As will be seen by the illustration, this Barometer 28 built on original lines.

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 epos the column, and therefore an extremely accurate and in stantaneous reading is made possible. The scales being graduated upon the flat side pieces the DIVISIONS AND FIGURES ARE ALWAYS IN VIEW, and the versier 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 inche and millimetres, and by means of the verniers, are capable of being sub-divided to read to 0.002 inches and 0°1 m/m.

The attached Thermometer on the body of the instroment is graduated in Fahrenbeit and Centigrade scales

It is the BOLDEST Standard Barometer made. The PRICE IS LOWER than that of any other forms 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 sma!! private Observatories ; bore -25; reading to '01 inch

and •1 millimetre. £3 7s.6d. Sole Manufacturers and Proprietors 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. Estd. 150 r ears. Telegrams: "Rapkin, London." Nat. Tel. : 1981 Holborn N. B.- If any difficulty in securing our Instruments

through your Dealer, kindly communicate with us. ILLUSTRATED PRICE LIST POST FREE.

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NEWTON & CO., Opticians to H.M. The King H.R.H. The Prince of Wales,

and the Government, 3 FLEET STREET,

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