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A TREATISE ON CHEMISTRY.

NEW AND REVISED EDITION, NOW READY.

By SIR H. E. ROSCOE, F.R.S., and C. SCHORLEMMER, F.R.S. Vol. I. –The Non-Metallic Elements. New Edition, completely revised by Sir H. E. Roscoe, assisted by Dr. H. G. COLMAN

and Dr. A. HARDEN. With 217 Illustrations. Svo. 215. net.

THIRD EDITION. Entirely Re-written and Enlarged. CHEMICAL TECHNOLOGY AND ANALYSIS OF

OILS, FATS, AND WAXES. By Dr. J. LEWKOWITSCH, M.A., F.I.C., &c. Consulting and Analytical Chemist and Chemical Engineer ; Examiner in Snap Manufacture and in Fats and Oils, including Candle Manufacture, to the City and Guilds of London Institute.

With 88 Uustrations and numerous Tables. In Two Volumes. Medium Svo, gilt tops. 36s, net. NATURE.--" The standard English book of reference on the subject." THE LABORATORY COMPANION TO FATS AND

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By Dr. LEWKOWITSCH, F.I.C. 8vo. 6s. net. CHEMICAL TRADE JOURNAL.--"Bound to become a constant companion to the chemist who deals with oils and fats."

THE ANNUAL OF THE BRITISH SCHOOL AT ATHENS.

No. X. Session 1903-4. Illustrated. 175. net. CONTENTS :-The Palace of Knossos, A. J. Evans ; Teams of Ball Players at Sparta, M. N. Tod; Grotesques and the Evil Eye, A. J. B. Wace; Old Egyptian Ploughs, II. Schafer ; Mystica Vannus Iacchi, Miss J. E. Harrison ; S. Western Laconian Sites, E. S. Forster ; Excavations at Palaikasıro, R. M. Dawkins and C. T. Currelly : &c., &c.

SIXTH EDITION, REVISED AND ENLARGED. THE ADVANCED PART OF A TREATISE ON THE DYNAMICS OF A SYSTEM OF RIGID BODIES.

Being Part II. of a Treatise on the Whole Subject. With numerous Examples.

By EDWARD JOHN ROUTH, Sc.D., LL.D., F.R.S., &c. 8vo. 145. MAGNETISM AND ELECTRICITY FOR STUDENTS. By H. E. HADLEY, B.Sc. (Lond.), Associate of the Royal College of Science, London ; Headmaster of the School of

Science, Kidderminster. Globe 8vo. 6s. TWENTY-SIX GRADUATED EXERCISES IN GRAPHIC STATICS,

some in Two Colours, and with Skeleton Data to practise upon, and including the Application to Roofs, Moving Locomotives, Retaining Walls, Lévy's Steel Arches, Girders (Original Constructions), Masonry Arches, Lévy's Weight Tables, with an Essay on Graphical Statics, in the form of a Running Commentary on the Exercises, each of which has full Instructions printed on its face, the

whole forming a Supplement to the Authors' Elementary Applied Mechanics. By T. ALEXANDER, M.Inst.C.E.I., Professor of Engineering, Trinity College, Dublin ; and A. W . THOMSON, D.Sc., C.E., Professor of Engineering, College of Science, Poona.

FCAP. BROADSIDE. SEWED. 10s.
ENGINEER.-"An exceptionally good and useful work on graphic statics, which deals fully with the subject."

A MANUAL OF QUATERNIONS.

By CHARLES JASPER JOLY, M.A., D.Sc., F.R.S., Sec. R.I.A. ;. Fellow of Trinity College, Dublin ; Andrews' Professor of Astronomy in the University of Dublin, and Royal Astronomer of Ireland.

8vo. 10s. net. NATURE.-" There can be no question as to the high merits of the Manual of Quaternions. It is a worthy companion volume to the master's own great works.' WOOLWICH MATHEMATICAL PAPERS, for Admission into the Royal Military

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Physics and Hydraulics of the River Chagres, cut at the Continental Divide, and Discussion of Plans for the Waterway. By Brig. Gen. HENRY L. ABBOT, U.S. Army, retired; Consulting Engineer, New Panama Canal Company. With Map. Crown Svo, gili tup, 6s. 6d. net.

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THE NEW COLLECTION OF 336 SPECIMENS AND SLIDES OF ROCKS,

205

WATKINS & DONCASTER,

MICROSCOPICAL PETROGRAPHY.

PHENIX
ASSURANCE COMPANY, LIMITED.

FIRE OFFICE.
19 LOMBARD ST., E.C., and 57 CHARING CROSS, S.W.

according to H. ROSENBUSCH: “ Elemente der ESTABLISHED 1782.

Gesteinslehre, 2d ed. 1901.”
Moderate Rates. Absolute Security. Electrio
Lighting Rules Supplied.

Accompanied by a text-book : "Practical Petrography," giving a short
Liberal Loss Settlements.

description of the polarizing microscope and its application, and also of the Prompt Payment of Olaims.

macroscopical and microscopical features of every specimen of this collecLOSSES PAID OVER 296,000,000.

tion, by Professor Dr. K. Busz of the University of Münster. This

collection is intended for the practical use of students, and contains typical NORWAY. - S.Y. "MIDNIGHT SUN." representatives of all important types of rocks; it is composed of 277

3,178 Tons. Two Berth Cabins. All Berths massive rocks (94 deep-seated rocks, 50 dike rocks, 133 volcanic rocks), on same level. Finest yachting steamer afloat.

28 sedimentary, and 31 crystalline schists. Out of it two smaller collections - Sailing July 8, 22: August 5, 19.

of 250 and 165 specimens have been selected. The prices are as follows :Apply ALBION S.S. CO., LTD.,

Collection I. 336 Specimens of Rocks ... 380 Marks.
Newcastle-on-Tyne.

11 1a. S00SIUOS ..
Ia. 336 Slides ... ...

420 ALBERT EDWARD JAMRACH

. II. 250 Specimens of Rocks ... 270

Ila. 250 Slides ... . .. ... 310 ,
(Late CHARLES JAMRACH),

III. 165 Specimens of Rocks ... 170 ,
NATURALIST,

, Illa. 165 Slides ... ... ...
180 ST. GEORGE STREET EAST.

COLLECTIONS OF MINERALS, FOSSILS, METEORITES, Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery, Netsukis China, Lacquers, Gongs, Shells, and other Curios.

PURCHASED FOR CASH OR EXCHANGED. ROCKS, MINERALS, FOSSILS.

The fifth edition of Catalogue No. 4, Petrography, has just For Collectors, Students, Technical Schools, Colleges, &e. | been published (210 pages), and will be sent free of charge on COLLECTIONS IN POLISHED DEAL BOXES.

application. as Specimens, 5/6; so do., 10/6; 100 do., 21/- ; 200 do., 42/

10 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/Adapted for the Board of Education Examinations in

Dr. F. KRANTZ, Geology, Physiography, and Mineralogy. A large stock of Minerals, Rocks, Fossils and Microscopic Objects for RHENISH MINERAL OFFICE, BONN.ON-RHINE, GERMANY.

selection. Specimens sent on approval.
Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped

ESTABLISHED 1833.
Boxes, Models of Crystals, &c., &c.

NEW CATALOGUE POST FREE.
THOMAS D. RUSSELL, 78 Newgate St., London, E.C.

Naturalists and Manufacturers of

CABINETS AND APPARATUS Gentlemen interested in the above study are invited to send to

FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL JAMES R. GREGORY & CO.,

· BRANCHES OF NATURAL HISTORY. 1 Kelso Place, Kensington Court, London, W.,

SPECIAL SHOW-ROOM FOR CABINETS. for a Prospectus of

N.B. - For Excellence and Superiority of Cabinets and Apparatus, refer. THE TWENTIETH CENTURY ATLAS OF

ences are permitted to distinguished patrons, Museums, Colleges, &c. MICROSCOPICAL PETROGRAPHY, now being issued in Twelve Monthly Parts, each Part containing Four Fine A LARGE STOCK OF INSECTS, BIRDS' EGOS AND SKINS.

Half-Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 7/-; Quarterly, 21/-;

SPECIALITY.-Objects for Nature Study, Drawing

Classes, &c. or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.

Birds, Mammals, &c., Preserved and Mounted by First-class

Workmen true to Nature.
All Books and Publications on Natural History supplied.

36 STRAND, LONDON, W.C. Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium,

(Five Doors from Charing Cross.) Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price is. per Tube, Post Free. Helix

1 New Catalogue (102 pp.) just issued, post free. pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes.

THOMAS BOLTON, 25 BALSALL HEATH ROAD. BIRMINGHAM

MINERALS, ROCKS, FOSSILS.

A large stock of BRITISH AND FOREIGN MINERALS always on view.
MARINE BIOLOGICAL ASSOCIATION CORNISH MINERALS
OF THE UNITED KINGDOM.

A SPECIALITY.
THE LABORATORY, PLYMOUTH.

Special display for Teachers and Students on Saturdays. Open till 7 p.m. The following animals can always be supplied, either living

RICHARDS' SHOW ROOMS, or preserved by the best methods :

3 Beauchamp Place, Brompton Road, South Kensington, Sycon: Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllla, Alcy.

London, S.W. onium ; Hormiphora (preserved); Leptoplana; Lineus, Ampbiporas, Nereis, Aphrodite, Arenicola, Lanice, Terebella ; Lepas, Balanas, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Elodone CUTTELL'S ROCK CUTTING MACHINE Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinas

is the most simple and practical for section cutting, &c., 63 155. Ascidia, Salpa (preserved), Scyllium, Rala, &c., &c.

Prize Medal Exhibition of Inventions.-19 Abbotstone Road, Putney, For prices and more detailed lists apply to

S.W. Biological Laboratory. Plymouth,

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LIVING SPECIMENS FOR

THE MICROSCOPE.

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WOODHOUSE INCLINED' PLANE.

The external

Dr. Haldane's Mine Gas Apparatus £3 17 6 dimensions of the

Mercury, pure, for same, 2-lb. in cabinet are bottle

086 13 X 7 X 31 inches, and the Caustic Potash Solution, 1-pint in

Price 25/

010 weight when

bottle charged ready

“ The Investigation of Mine Air," for use is about

by Sir C. Le Neve Foster and five pounds.

Br. Haldane, 1905.. 060 TOWNSON & MERCER, Sole Makers : C. E. MÜLLER, ORME & CO., Ltd.,

34 CAMOMILE STREET, E.C. 148 HIGH HOLBORN, LONDON, W.C.

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A few Milligrams of the
HIGH ACTIVITY

RADIUM BROMIDE

for Sale. ISENTHAL & CO., 85 MORTIMER STREET, LONDON, W.

Contractors to the Admiralty, War, India, and Colonial Offices, &c.

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I'rinted by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN

AND Co., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, June 29. 1905.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground

Of Nature trusts the mind which builds for aye.”-WORDSWORTH. No. 1862, Vol. 72] THURSDAY, JULY 6, 1905.

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

(All Rights are Reserved.

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EGYPTIAN GOVERNMENT. BIRKBECK COLLEGE MINISTRY OF PUBLIC INSTRUCTION.

BREAMS BUILDINGS, CHANCERY LANE, E.C. The following posts at the School of Medicine, Cairo, are vacant:(a) ASSISTANT to the PROFESSOR OF ANATOMY

FACULTY OF SCIENCE. (Dr. G. Elliot Smith);

DAY AND EVENING COURSES. (6) ASSISTANT to the PROFESSOR OF PATHOLOGY (Dr. Alex. R. Ferguson).

Chemistry .

SJ. E. MACKENZIE, Ph.D., D.Sc Each appointment is for two years, and may be renewed at the end of

*** TH. WREN, Ph.D., B.A., B.Sc. that time. Applicants should forward copies of testimonials and such other

ALBERT GRIFFITHS, D.Sc. Physics ...

D. OWEN, B.A., B.Sc. particulars as are mentioned below.

B. W. Clack, B.Sc. The pay of each post is £E. 320 per annum, the Egyptian pound being worth 6d, more than the pound sterling.

Mathematics

E. H. SMART, M.A. Private Practice is not allowed.

*** 1 W. G. BIRT, B.A., B.Sc. It is to be distinctly understood that the appointment gives no claim to Botany ...

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

F. E. FRITSCH, Ph.D., B.Sc. pension or indemnity.

Zoology ... The Government reserves to itself the right to dismiss the Assistant for

H. W. UNTHANK, B.A., B.Sc. misconduct or incapacity.

Geology & Mineralogy ... GEO. F. HARRIS, F.G.S. In the Government Schools, as in all State Administrations in Egypt,

Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M. Sunday is a working day. The Schools are closed on Fridays.

RESEARCH in Chemistry and Physics in well-equipped laboratories. 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 French, German, Spanish, Russian, Dutch, & Italian Classes. granted, depend upon the exigencies of the service,

EVENING CLASSES also in Biology, Physiology, Practical Geometry, Pay commences from date of arrival in Cairo. On taking up his duties

Building and Machine Construction, Steam, Theoretical and Applied in Cairo, each Assistant will receive one month's pay in lieu of passage

Mechanics, Land and Quantity Surveying, and Estimating. money. All applicants should attach a certificate from a legally qualified medical

Calendar 6d. (post free 8d.), on application to the SECRETARY. man, stating that in his opinion the candidate is in a fit state of health to undertake the duties of the post.

All applicants should state their age, what foreign languages they know, At the SOUTH-WESTERN POLYTECHNIC, and if they can be in Cairo by October 1.

Manresa Road, Chelsea, S.W., Day College Courses of thirty bours The latest mail by which applications may be posted will leave London

per week will be conducted in preparation for the London Universi on Friday, July 14. Applications to be addressed to the DIRECTOR,

Degrees of B.Sc. in Mechanical and Electrical Engineering, in ChemisGovernment School of Medicine, Cairo, Egypt.

try, Physics and the Natural Sciences. The composition fee for the

Session of three terms, 1905-1906, is £15. These Courses are recog. MINISTRY of PUBLIC INSTRUCTION,

nised for “Internal Students" of the University, and consist of

lecture and laboratory instruction. The Courses are conducted by :EGYPT.

MECHANICAL ENGINEERING, W. W. F. Pullen, A. Macklow
Smith; ELECTRICAL ENGINEERING, A. J.Makowe:

CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe. POLYTECHNIC SCHOOL OF ENGINEERING.

MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister An INSTRUCTOR in ENGINEERING is required to begin work on and L. Lownds; BOTANY, H. B. Lacey and T. G. Hall: September 30 in the Polytechnic School of Engineering, Ghizeh (near

GEOLOGY, A. J. Maslen. In the evenings similar Courses will be Cairo).

conducted, but at £2 per Session. Also TECHNICAL DAY The Instructor appointed will be engaged in teaching Descriptive COURSES of three years' duration are arranged as a preparation for Engineering and Hydraulics.

the Engineering, Electrical and Cbemical and Metallurgical pro Candidates must have had practical experience as engineers, and have

fessions. The Laboratories and Workshop are open for RESEARCH been engaged on work of a class intimately related to the subjects to be under the direction of The Principal and the Heads of Departments. taught. They should be from 25 to 35 years of age, unmarried, and have a robust constitution.

Further particulars may be obtained on application to The A University Degree or Diploma in Engineering is an essential qualifi SECRETARY, who will send the Calendar and Prospectus for 31d., or cation.

it may be obtained at the Office, price id. Salary about £430 per annum (£ Eg: 35 per mensem), rising to about €553 per annum (& Eg. 45 per mensem). Allowance for passage out to Egypt. Bachelor quarters are provided.

Applications, with full statement of qualifications, and accompanied by copies only of testimonials, must be sent in before July 22, 1905, addressed to W. C. MACKENZIE, Esq., D.Sc., 5 The Crescent, Cromer, to whom candidates may apply for further information.

For MATRICULATION, B.A., SCHOLARSHIPS, and PROFESSIONAL PRELIMINARIES. Tuition in Latin, Greek. French. German, Italian, Mathematics, Mechanics, Physics, Chemis

try, Psychology, Logic, Political Economy, Book-keeping. EGYPT.

The Staff includes Graduates of Oxford, Cambridge, London, and Royal

Universities.-Address Mr. J. CHARLESTON, B.A., Burlington CorrespondSCHOOL OF AGRICULTURE.

ence College, Clapham Common, London, S.W. An INSTRUCTOR in LAND SURVEYING and FARM ENGINEERING is required to begin work on September 30 in the BOROUGH OF ASTON MANOR School of Agriculture, Ghizeh (near Cairo). Preference will be given to candidates having experience of Practice and

EDUCATION COMMITTEE. Teaching. They should be from 23 to 33 years of age, unmarried, and have a robust constitution.

MUNICIPAL TECHNICAL SCHOOL. A University Degree or College Diploma is an essential qualification. Salary about £295 per annum (£Eg. 24 per mensem), rising to about The Committee invite applications for the following vacant appoint£393 per annum (Eg. 32 per mensem). Allowance for passage out to

ments : Egypt. Bachelor quarters are provided.

ASSISTANT, qualified to teach Electrical Engineering, Mathematics. Applications, with full statement of qualifications, and accompanied by Steam, Applied Mechanics, and Engineering subjects generally. Com copies only of testimonials, must be sent in before July 22, 1905, addressed mencing salary, £120 per annum. to w. C. MACKENZIE, Esq., D.Sc., 5 The Crescent, Cromer, to whom ASSISTANT, qualified in Chemistry, Physics and Mathematics. Comcandidates may apply for further information.

mencing salary, £110 per annum.

Graduates preferred.

Applications, giving full particulars and enclosing copies of three recent HARTLEY UNIVERSITY COLLEGE, testimonials, should be sent to THE SECRETARY, Education Office, Albert

Road, Aston Manor, not later than July 10, 1905. SOUTHAMPTON. Principal—S. W. RICHARDSON, D.Sc., B.A. CITY OF BIRMINGHAM EDUCATION The Council of the College invite applications for the following

COMMITTEE. appointments :1. ASSISTANT LECTURER IN ENGLISH, who will also be re The Committee REQUIRES the services of an ASSISTANT MASTER

quired to give some elementary instruction in LATIN, Salary, for the COUNCIL CENTRAL SECONDARY SCHOOL, Suffolk Street. €130 per annum.

Salary, £100 to £160 per annum, according to qualifications and expe 2. ASSISTANT LECTURER IN MATHEMATICS, who will also

rience. Candidates must be well qualified in Engineering Subjects and be required to give some elementary instruction in PHYSICS.

Mathematics.
Salary, £130 per annum

Form of Application may be obtained from the undersigned, wbuch

should be returned immediately. Applications, giving particulars of age, training, qualifications, and experience, with copies of three recent testimonials, must be sent to the

JNO. ARTHUR PALMER, Secretary REGISTRAR (of whom further particulars may be obtained) on or before Education Department, Edmund Street,

TUITION BY
CORRESPONDENCE.

MINISTRY of PUBLIC INSTRUCTION,

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