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THE THERMOSCOPE

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 Education. Masters to begin work in October, in Cairo or Alexandria, and to teach in English exclusively. Over 400 boys In sich School, mainly Mohammedans. In the case of two of the Masters Do* required, the subject mainly essential is Science (Experimental Physics and Chemistry): six of the new Masters will be principally engaged in tracking Mathematics; the others will be concerned more particularly with the teaching of English, including History and Geography. Candidates would be not less than 23 nor over 30 years of age, have a robust constitution, and have taken a University Degree in Honours. They should have gperience as Teachers : preference will be given to applicants who hold a Diploma in Teaching. Salary, £295 per annum (Eg.24 per mensem), tiang to £393 per annum (Ég.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 May 31, 1906, marked outside Assistant Masterships," and addressed to H. J. Boyd-CARPENTER, Esq. Senior Inspector, Ministry of Education, Cairo, Egypt, to whom candidates may apply for further information.

Designed by Prof. LOOSER, of ESSEN, enables

57 PHYSICAL EXPERIMENTS to be performed in the simplest and most striking manner

in view of the whole class.
Has had a phenomenal sale in France and Germany.

The Complete Apparatus, price £9 98. A copy of the English Translation of Prof. Looser's book, fully describing the apparatus and the experiments that can be made with

it, will be sent GRATIS and POST FREE on application to the SOLE AGENT for the apparatus in U.K.

and Colonies,

C. L. MÜLLER, 6 PARTON STREET, RED LION SQUARE, LONDON, W.C.

UNIVERSITY OF MANCHESTER. GARTSIDE SCHOLARSHIPS OF COMMERCE AND

INDUSTRIES. Candidates must be of British Nationality, and over the age of 18, and ander the age of 23 at the date of election. The Scholarships, three of whick may be awarded in June, will be tenable for two years and of the value of LBo the first year (which' must be spent at the University), and from 6150 to £250 the second year (which must be spent in the study of sebjects bearing on Commerce in the United States, Germany, or other Opuntry or countries approved by the electors). Candidates must send in their applications, together with testimonials of good character and record of previous training, on or before June 1 to the REGISTRAR, from whom funibet particulars can be obtained.

SCHOOL BOTANY.
We have prepared for use in
Primary & Secondary Schools

COLLECTIONS OF
SPECIMENS of VARIOUS

WOODS AND OTHER BOTANICAL OBJECTS.

The former are very care. fully selected in cross and long sections, in order to show the distinctive features and marks of each individual wood, and also to show their well-marked Botanical Characteristics, such as the Bark, Rings of Growth, Medullary Rays, &c., &c. Illustrated List in Botany and Plant Physiology (including full

particulars and prices of above), post free.

GALLENKAMP & CO., Ltd., 19 & 21 SUN STREET, Finsbury Square, LONDON, E.C.

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A.

CADET SCHOOL SHIP “CONWAY,

LIVERPOOL. WANTED, immediately, a MASTER to teach MATHEMATICS on Modera lines and THEORETICAL and PRACTICAL PHYSICS. The work will be mainly with Cadets doing the work of the Royal Naval College, Osborne. Śalary. £165 per annum, non-resident. Application to be made to the HEAD MÁSTER. TO SCIENCE AND MATHEMATICAL

MASTERS.-Immediate and September Vacancies.- Graduates 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.

BACTERIOLOGY and PATHOLOGY.
KING'S COLLEGE, LONDON.

Prof. HEWLETT and Dr. F. E. Taylor.
The Department of General Pathology and Bacteriology is open daily
& Instruction and Research.
For particulars apply to the Secretary or to Prof. HEWLETT.

NORWAY. ---S.Y.

“ MIDNIGHT SUN.” 3,178 tons Two Berth Cabins. No Upper

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ESTABLISHED 1782.
Moderate Rates. Absolute Security. Electric
Lighting Rules Supplied. Liberal Loss Settlements,

Prompt Payment of Claims.
LOSSES PAID OVER £28,000,000,

.

BATTERSEA POLYTECHNIC,

LONDON, S.W. The Governing Body invite applications for the post of HEAD of the DEPARTMENT of ÉLECTRICAL ENGINEERING from September tal Electrical experience and teaching experience essential. Fare particulars send stamped and addressed envelope to the SECRETARY.

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Chartered Patent Agents, 322 HIGH HOLBORN, LONDON, and at LIVERPOOL.

SPECIAL ATTENTION PAID TO SCIENTIFIC INVENTIONS, Maual and Forms Post Free. Trade Marks and Designs Registered.

Send a card merely quoting 2396. TAYLOR. TAYLORE HOBSON. Lt!

61 OUGHTON STREET WORKS. LEICESTER

SE PER LONDON
A MADEN, NO

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SODEAU'S ACCURATE GAS ANALYSIS APPARATUS,

As used in the leading Universities.

DESCRIPTION ON APPLICATION.

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BRADY & MARTIN, LTD.,

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Chemical Apparatus Manufacturers. NEWCASTLE-UPON-TYNE.

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Pure Chemicals.

Dr. HAMPSON'S AIR-LIQUEFIER is now made to a standard pattern, and numbers are in use in University Laboratories and elsewhere in various countries. The whole apparatus is neat and compact and its parts very easily moved; the Liquefier, without stand, being a cylinder 17 inches high and 8 inches in diameter.

It begins to liquefy air in from 6 to 10 minutes after the admission of air at from 150 to 200 atmospheres pressure, making over a litre of liquid per hour.

It requires no auxiliary refrigerant and produces a perfectly clear liquid which requires no filtering.

The operator has only one gauge to watch and one valve to control. HYDROGEN LIQUEFIER to the designs of Dr. MORRIS W. TRAVERS for use in conjunction with Air-Liquefier.

BECKER, Hatton Wall, LONDON.

For Prices and Particulars apply to the Sole Makers :BRIN'S OXYGEN COMPANY LIMITED,

SOCIETY FOR PROMOTING CHRISTIAN KNOWLEDGE.

THE ROMANCE OF SCIENCE: THE EARLY BRITAIN:

NEW STATE OF MATTER. An Address by Prof. H. ROMAN ROADS IN BRITAIN. By Thomas PELLATE, of the Sorbonne, delivered April 3, 1905. Trans- CODRINGTON, M. Inst. C.E., F.G.S. Fcp. 8vo. With lated by EDMUND MCCLURE, M.A. Small post Svo,

several Maps. Cloth boards, 5s. cloth boards, Is.

The TIMES says "Mr. Codrington's book has much to recommend it THE ROMANCE OF SCIENCE: The to the antiquary and the topographer. To come suddenly upon a book

literally packed with suggestions for the well-being of the walker is, in this Machinery of the Universe. Mechanical Conceptions of year of grace and automobility, no small joy." Physical Phenomena. By A. E. DOLBEAR, A.B., A.M., ROMAN BRITAIN. By Edward Conybeare. M.E, Ph.D., Professor of Physics, Tuft's College, U.S.A. Fcp. 8vo, cloth boards, 35. 6d. Small post Svo, with several Diagrams. Cloth boards, 2s.

CELTIC BRITAIN. By Principal Rhys. Third MATTER ÆTHER, AND MOTION: The Edition, Revised. Fcp. 8vo, with 2 Maps, cloth boards, 35. Factors and Relations of Physical Science. By A. E.

WAVES AND RIPPLES IN WATER, DOLBEAR, A.B., A.M.M.E., Ph.D., Professor of Physics, AIR, AND ÆTHER. Being a Course of Christmas Tuft's College, U.S.A. English Edition. Edited by Prof. Lectures delivered at the Royal Institution of Great Britain

ALFRED LODGE. Illustrated. Crown 8vo, cloth boards, 5s. by J. A. FLEMING, M.A., D.Sc., F.R.S. With numerous MARVELS in THE WORLD of LIGHT.

Illustrations. Crown 8vo, cloth boards, 5s. A Popular Study of the Phenomena of Light, Colour, and

WAYSIDE SKETCHES. By F. Edward Sight. By the Very Rev. C. T. Ovenden, D.D., Dean

Hulme, F.L.S. With numerous Illustrations. Crown of Clogher. With numerous Illustrations. Crown 8vo,

Svo, cloth boards, 45. cloth boards, 25. 6d.

SKETCH-BOOK OF BRITISH BIRDS. FLOWERS OF THE FIELD.

By the

By R. Bowdler SHARPE, LL.D., F.L.S. 272 pages. late Rev. C. A. Johns, B.A., F.L.S. Thirtieth Edition. With Coloured Illustrations by A. F. and C. Lydon. Entirely Re-written and Revised by Prof. G. S. Boulger,

Crown 4to, cloth boards, 145. F.L.S., F.G.S., Professor of Botany in the City of London

The GUARDIAN says : “Briefly, he has produced a most interesting

and informing book, which has been admirably illustrated." College. With numerous Woodculs. Small post 8vo,

JUBILEE OF THE COAL TAR COLOUR INDUSTRY. cloth boards, 75. 6d. ; half-call, gilt edges, 145.

Romance of Science Series. WILD FLOWERS. By Anne Pratt,

COAL AND WHAT WE GET FROM IT. Author of "Our Native Songsters." Two vols. With 192 Coloured Plates. Tomo, cloth boards, 8s.

By Professor R. Meldon.A, F.R.S., F.I.C., &c. Third

Edition, with numerous Diagrams. Post 8vo, cloth boards, THE FERN PORTFOLIO. By Francis

25. 6d. G. HEATH, Author of “Where to Find Ferns," &c. An intelligible account of the successive stages in the development of With 15 Plates, elaborately drawn life size, exquisitely the coal tar industry without assuming any knowledge of chemical science Coloured from Nature, and with Descriptive Text. Cloth

on the part of the reader is undeniably bold."-Chemical News.

This is a work of general importance, and on the occasion of the Jubilee boards, 6s.

of the Coal Tar Colour Industry, of special interest. London : Northumberland Avenue, W.C. ; 43 Queen Victoria Street, E.C. Brighton : 129 North Street.

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PYE & SCIENTIFIC INSTRUMENT MANUFACTURERS,

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complete with Furnace, 4/6 and RADIUM SALTS & RADIO-ACTIVE PREPARATIONS. tinctly stamped

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The consumption of gas is the CALCIUM METAL, 1/3 oz.; 15/- lb. “BREWSTER,

same as with an ordinary Bunsen, SMITH & Co., but the heat derived' is three

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times as great, and a number of Beware of imita.

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We are the SOLE MAKERS. 4 OLIVER'S YARD, CITY ROAD, LONDON, E.C. Dr Nature says :-"The combination of furnace and burner is very convenient. These little furnace. are not only useful for reducing calcium carbonate to lime, but also work very wellin fusion experiments. BREWSTER, SMITH & CO., 6 CROSS ST., FINSBURY PAVEMENT, LONDON.

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Lantern Slides suitable for Lectures. LABORATORIES FITTED & FURNISHED THROUGHOUT. Our NEW CHEMICAL APPARATUS LIST post free, 1/

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Certificates of Radio-activity, 5/- each sample. HIGH GRADE SET.

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TYPE-WRITING UNDERTAKEN BY Harl ng's improved or nut HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. and bult needle points.

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HOPKIN & WILLIAMS, Ltd.
16 CROSS STREET, HATTON CARDEN, LONDON, E.C.

Works-ILFORD, E.
PURE CHEMICALS
For TEACHING, RESEARCH, and TECHNOLOGY.

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MESSRS. LONGMANS & CO'S LIST.

COMPLETE IN THREE VOLUMES, HALF-BOUND.
Vol. I., with 236 Illustrations, 8vo, £2 2s. Vol. II., with 240 Illustrations, 8vo, £2 2s.

Vol. III., with 352 Illustrations, Svo, £3 3s.

A DICTIONARY of APPLIED CHEMISTRY

By T. E. THORPE, C.B., F.R.S., Ph.D., D.Sc., &c.

ASSISTED BY EMINENT CONTRIBUTORS.

FOURTH EDITION, RE-WRITTEN AND ENLARGED (1905). SELECT METHODS IN CHEMICAL ANALYSIS

(CHIEFLY INORGANIC). By Sir WILLIAM CROOKES, Hon. D.Sc. (Oxford and Dublin), F.R.S., P.P.C.S., P.P.Inst.E.E.,

Editor of the Chemical News. Illustrated with 68 Woodcuts. 8vo. 21s. net.

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IN

Works by G. S. NEWTH, F.I.C., F.C.S.,

DEMONSTRATOR The Royal College of Science, LONDON. A MANUAL OF CHEMICAL ANALYSIS, QUANTITATIVE AND QUALITATIVE.

SIXTH IMPRESSION (1905). With 102 Illustrations. Crown 8vo. 6s. 6d.
A TEXT-BOOK OF INORGANIC CHEMISTRY.

ELEVENTH EDITION (1905). With 155 Illustrations. Crown 8vo. 6s. 6d.
CHEMICAL LECTURE EXPERIMENTS : NON-METALLIC ELEMENTS.
NEW IMPRESSION (1905). With 230 Illustrations. Crown 8vo. 68.

THIRD EDITION, 1905. With 374 Illustrations and Diagrams. Svo. 10s. 6d. net.
ELEMENTARY TREATISE ON ELECTRICITY AND MAGNETISM.

By G. CAREY FOSTER, F.R.S., Fellow and Emeritus Professor of Physics in University College, London ; and ALFRED W. PORTER. B.Sc., Fellow of and Assistant Professor of Physics in University College, London. Founded on Joubert's “ Traité Élémentaire d'Électricité.”

SECOND EDITION, ENLARGED. With 189 Diagrams. 8vo. 15s. net. HIGHER MATHEMATICS FOR STUDENTS OF CHEMISTRY AND PHYSICS.

With Special Reference to Practical Work. By J. W. MELLOR, D.Sc.
JUST PUBLISHED. With 200 Diagrams and Answers to the Examples and Examination Papers. 8vo. 6s. 6d.
A COURSE IN PRACTICAL MATHEMATICS.
By F. M. SAXELBY, M.Sc., B.A., Head of the Mathematical Department, Municipal Technical Institute, Belfast.

By Professor GANOT.
Translated and Edited by E. ATKINSON, Ph.D., F.C.S., and Professor A. W. REINOLD, M.A., F.R.S.

SEVENTEENTH EDITION JUST PUBLISHED.
ELEMENTARY TREATISE ON PHYSICS, EXPERIMENTAL AND APPLIED.

With 9 Coloured Plates and Maps and 1048 Woodcuts. Crown 8vo. 15s.
NATURAL PHILOSOPHY FOR GENERAL READERS AND YOUNG PERSONS.
With 7 Plates, 632 Woodcuts, and an Appendix of Questions. Crown 8vo. 78. 6d.

With Coloured Plate and 135 Illustrations in the Text. 8vo. 10s. 6d. net.
AN INTRODUCTION TO THE STUDY OF SPECTRUM ANALYSIS.
By W. MARSHALL WATTS, D.Sc. (Lond.), B.Sc. (Vict.), F.I.C.

SIXTH IMPRESSION (1905). With 579 Illustrations. Large Crown 8vo. 10s. 6d.
A TEXT-BOOK OF PHYSICS.

For use in Technical Schools, Advanced Science and Art Classes, Engineering Schools, Universities, &c., &c. By W. WATSON, F.R.S., D.Sc., Assistant Professor of Physics at the Royal College of Science, London. LONGMANS, GREEN & CO., 39 PATERNOSTER ROW, LONDON, E.C.

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