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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 commence 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, 615 or 611 per annum.

Three Fntrance Scholarships of the value of 652 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 sees, dates, &c., and all information respecting the work of the Institute, can be obtained at the Institute or on appli. cation to

R. MULLINEUX WALMSLEY, D.Sc.,

Principal.

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 renewed at the end of that time. Applicants should forward copies of testimonials and such other particulars as are mentioned below.

The way of the post is (E.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 cominences 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 should 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,
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 GOVERNMENT OF CEYLON

require a LECTURER in PHYSICS and a LECTURER in CHEMISTRY for the Colombo Medical and Technical Colleges. Salary for each post, £400, rising by annual increments of £25 to 2500

a year The Government also require a SCIENCE MASTER for the Royal

College, Colombo, to teach Chemistry and Physics for London Uni. versity Pass Examinations, including the Intermediate B.Sc. Salary,

6350, rising to £450 by annual increments of £25. For the above appointments preference will be given to graduates in

honours of any British University, under the age of 35. Salaries are subject to a deduction of 4 per cent. as contribution to the

Widows' and Orphans' Pension Fund. Free passages to the Colony. Leave and pension on same terms as to

other officers of the permanent service. Applications should be sent before August 15 to the Assistant Private SECRETARY, Colonial Office, S.W., and envelopes should be marked with the name of the post applied for. Copies only of testimonials (not more than six).

Their age,

BOROUGH POLYTECHNIC

INSTITUTE, 103 BOROUGH ROAD, LONDON, S.E. (Five Minutes from Blackfriars, Westminster, Waterloo, Southwark and

London Bridges.)
TECHNOLOGICAL CHEMISTRY.

DAY COURSE. The Course is arranged for two or three years, and is intended for those who desire to become technical chemists and to enter chemical or other works. For this reason, instruction not only in Chemistry, but in Physics, Engineering and Mathematics is given. In the Course special attention is paid to the Electrochemical side.

Fee for the Course-October to July-£10.
Full particulars may be had on application.

C. T. MILLIS, Principal.
UNIVERSITY OF DURHAM.
ARMSTRONG COLLEGE,

NEWCASTLE-UPON-TYNE.
Principal : Sir ISAMBARD OWEN, D.C.L., M.D.

SESSION OF 1906-7
Matriculation and Exhibition Examinations, Sept. 24-29.
Opening of Term, October 2.

Particulars of curricula for University Degrees and College Diplomas in Engineering Electrical Engineering, Naval Architecture, Mining, Metallurgy, Agriculture, Pure Science and Letters; as well as of Fellow. ships, Scholarships and Exhibitions, and of facilities for residence on application to

F. H. PRUEN, Secretary. Armstrong College,

Newcastle-upon-Tyne.
B.A. AND B.Sc. EXAMS.

MATRICULATION, INTERMEDIATE, FINAL, PREPARATION by CORRESPONDENCE (Residence abroad no impediment) or ORAL TUITION on a THOROUGHLY INDI VIDUAL 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, Psycbology, 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. COUNTY BOROUGH OF HUDDERS

FIELD.
TECHNICAL COLLEGE.
Principal J. F. Hudson, M.A., B.Sc.
JUNIOR

ASSISTANT in PHYSICS and ELECTRICAL ENGINEERING required in September. Salary, Eso per annum. For further particulars apply to

THOS. THORP, Secretary. UNIVERSITY OF MANCHESTER.

CHEMISTRY COURSE. A Prospectus containing full particulars of the Lecture and Laboratory Courses in Inorganic and Organic Chemistry qualifying for the Degrees in Chemistry, and for the Ceruñcate in Applied Chemistry, will be forwarded

DARTFORD TECHNICAL

INSTITUTE.
CHEMICAL DEPARTMENT.

EVENING CLASSES.
The Committee invite applications for the post of TEACHER of
CHEMISTRY (Theoretical and Practical), who may be required to give
instruction on four evenings per week for about three hours per evening.

Salary, £90 per Winter Session of about 30 weeks. Applications should be warded not later than August u to Mr. D. F. Brow, Technical Institute, Dartford, Kent, from whom further particulars may be obtained.

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. University College, Cardiff, July 17, 1906.

Salaries £400 to £500, £350 to £450, and

£300 to £400. 20 Science Graduates for Public Colleges, England and Abroad Also Woodwork vacancy, 6150. List of Science and Mathematical Vacancies sent to all Candidates. ORELLA NA

Co. can guarantee each candidate with good references an appointment. No

fee till suited.

EstD. OVER 50 YEARS.

THOMAS PRINCE, SCIENTIFIC BOOKSELLER.

.

All books advertised and reviewed in NATURE are supplied

at lowest cash prices. Orders by post promptly dispatched, 85 PRAED STREET, LONDON, W.

THE UNIVERSITY OF LIVERPOOL.

SESSION 1906-7 COMMENCES OCTOBER 9

FACULTY OF ENGINEERING.
Dean-J. WEMYSS ANDERSON.

Professors AND LECTURERS.
ENGINEERING

(Harrison Professor-W. H. WATKINSON,

M. Inst. C.E., M.I.Mech. E., M.I.E.E. ELECTROTECHNICS

David Jardine Professor-E. W. MAR.

CHANT, D.Sc. MATHEMATICS

Professor F.S. CAREY, M.A. PHYSICS...

(Lyon Jones Professor-L. R. WILBER.

PORCE, M.A. CHEMISTRY

Grant Professor-J. CAMPBELL BROWN,

D.Sc., F.C.S., F.I.C.
RAILWAY ENGINEERING(Associate Professor - J. A. F. ASPINALL,

M.Inst.C.E.
MUNICIPAL
(Associate Professor-J. A.

BRODIE, ENGINEERING

. M. Inst.C.E. MUNICIPAL ELECTRICAL Associate Professor - A. BROMLEY

ENGINEERING... ...l HOLMES, M.Inst.C.E., M.Inst.E.E.
ENGINEERING DESIGN(Lecturer - J:

WEMYSS ANDERSON,
AND DRAWING... ... M.Inst.C.E., M.I.Mech. E.
APPLIED MECHANICS Lecturer-J. H. GRINDLEY, D.Sc.

The courses o study in the Faculty leading to the ordinary degree of Bachelor of Engineering or the certificate in Engineering are so arranged as to afford a general scientific training for those intending to become engineers or to enter any allied profession. The Honours course enables students to specialise in some branch of the profession, and opportunities are afforded for post-graduate work and research.

The special Prospectus of the Faculty may be obtained on application to the REGISTRAR.

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MINISTRY OF EDUCATION, EGYPT.

PRINCIPAL CONTENTS FOR AUGUST. SCHOOL OF AGRICULTURE. A VETERINARY SURGEON, having a knowledge of Botany and THE ADJUSTMENT OF THE CURRICULUM. - By A. T. Entomology, is required for the teaching staff of the above School. Candidates should be from 25 to 35 years of age, and unmarried.

POLLARD), M.A. Applications should be accompanied by a certificate from a legally qualified medical man, stating that in his opinion the candidate would pass as a first-class life for insurance purposes.

ARITHMETIC AS A MENTAL EXERCISE. By H. G. Salary about £295 per annum (L. Eg. 24 per mensem), rising to about £393 per annum (L. Eg:32 per mensem). Salary will be reckoned from the WILLIS, M.A. date of arrival in Cairo, and one month's salary will be paid in lieu of travelling allowance.

In the Government Schools, as in all State Administrations in Egypt, OBJECT LESSONS. I. By 0. H. LATTER, M.A.
Sunday is a working day. The Schools are clused on Fridays.

Applications, with full statement of qualifications, and accompanied by
copies only of testimonials, must be sent in before Auglist 20, addressed to ON WORD-BUILDING. By NELLIE DALE.
W. C. MACKENZIE, Esq., Seaforth, Gullane, N.B., from whom further
information may be obtained.

Folk-Plays and Folk-Education. By FANNY JOHNSON,
HARPER-ADAMS AGRICULTURAL
COLLEGE

The 1906 Code for Public Elementary Schools.
NEWPORT, SALOP.

The Use of Lantern Slides in Teaching. By F. L. LECTURER IN MATHEMATICS AND LAND-SURVEYING.

LOWTHER, B.A. Applications are invited for the above Lectureship on or before August 12.

The Lecturer will be required to enter upon his duties on October 1, 1906 Full particulars can be obtained on application to the PRINCIPAL.

DOMESTIC ECONOMY AS PART OF THE SCHOOL TO SCIENCE AND MATHEMATICAL

CURRICULUM. I. By E. M. LEAHY. II. By MASTERS. --September Vacancies --Graduates in Science and

FRANCES R. GRAY, other well qualified Masters seeking poits in Public and other Schools should apply at once, giving full details as to qualifications, &c., to Messrs. GRIFFITHS, Suth, Powell & SMITH, Tutorial Agents Some Geographical Apparatus. (Illustrated.) By G. (Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice of all the best vacancies will be sent.

McCROBEN. SECOND-HAND BOOKS at Half Prices!! THE TEACHING OF ELEMENTARY ARITHMETIC. From

New Books at 25 per cent. Discount! Books in all branches of SCIENCE, TECHNICS, and NATURAL HISTORY, and for

the Report of a Committee of the British all Examinations (Elementary and Advanced) supplied. Sent on approval. Lists free. State wants. Books bought ; good prices given.

Association. -- W. & G. Foyle, 135 Charing Cross Road, London, W.C.

Correspondence :--- Is School Science Worth Having? By " MIDNIGHT SUN." 3,178 tons Two Berth Cabins. No Upper

Prof. H. E. ARMSTRONG, Ph.D., LL.D., F.R.S. Berths in the ship. Finest yachting steamer

Modified Experiments in Chemistry and Physics. 12 12 - anaalCompare itineraries. Sailing August 11

(Illustrated.) By E. T. BUCKNELL. Modern Apply ALBION S.S. CO., LTD., Newcastle-on-Tyne.

Experiments in Education. By the Rev. W. C. TYPE-WRITING UNDERTAKEN

The Seven Sevens.
COMPTON, M.A., and others.

BY
HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. By J. W. REID, M.A.
TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher
Local, thorough acquaintance with Modern Languages). Research,
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Journal Society Chemical Pamphlets on application.

Industry, JUNE 15, 1906, BROWN & SON,

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THE LIFE & EXPERIENCES OF Sir Henry Roscoe, D.C.L., LL.D., F.R.S. Written by Himself.

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A SYSTEM OF APPLIED OPTICS. BEING A COMPLETE SYSTEM OF FORMULE OF THE SECOND ORDER, AND THE FOUNDATION OF A COMPLETE SYSTEM OF THE THIRD ORDER, WITH EXAMPLES OF THEIR PRACTICAL APPLICATION. By H. DENNIS TAYLOR, Optical Manager to T. Cooke and Sons, Ltd., of London, York, and Cape Town. 40. 30. net

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The Contents include :—The Palace of Knossos and its Dependencies : Provisional Report for 1905. By A. J. EVANS.Honorary Statues in Ancient Greece. By M. K. WELSH.-Boundary and Mortgage Stones. By H. J. W. TillyaRD.-A Visit to Skyros. By R. M. DAWKINS.-Laconia : Excavations at Angelona, Geraki, Thalamae, &c. By A. J. B. Wace and F. W. HASLUCK.-A Votive Relief to Asclepius. By G. P. BYZANTINOS. -An Apollo Inscription from Delium. · By Prof. RONALD BURROWS. - Palaikastro : Excavations in 1905. By R. M. DAWKINS, R. C. BOSANQUET, and C. H. Hawes. --Cretan Palaces and Aegean Civilisation. By D. MACKENZIE, &c.

For the New Syllabus of the Preliminary Examination for the Certificate (1907). LESSONS IN SCIENCE.

A Preliminary Course of Physics and Chemistry. By Professor R. A.

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The following is a list of the Steel Portraits that have appeared in the above Series :--
MICHAEL FARADAY.
LORD KELVIN.
I SIR RICHARD OWEN.

LOUIS PASTEUR.
THOMAS HENRY HUXLEY. BARON ADOLF ERIK NOR- JAMES CLERK MAXWELL.
CHARLES DARWIN.

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HERMANN L. F. HELMHOLTZ., WILLIAM SPOTTISWOODE. LORD LISTER.
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