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MACMILLAN & CO.'s NEW BOOKS.

NOW READY.
THE LIFE & EXPERIENCES OF

SIR HENRY ROSCOE,

D.C.L., LL.D., F.R.S. Written by Himself. With Photogravure Portraits and other Illustrations. 8vo.

I 25. net.

A HANDBOOK OF BRITISH INLAND BIRDS.

By ANTHONY COLLETT. With Coloured and Outline Plates of Eggs by ERIC PARKER. Crown 8vo. 6s. EVENING STANDARD AND ST. JAMES'S GAZETTE.-"This volume is one to read and to possess. It teaches much that is well worth knowing, and encourages a study that doubles the value and zest of the most ordinary country ramble." 1906 ISSUE READY NEXT TUESDAY.

Statistical and Historical Annual of the States of the World. Edited by J. SCOTT KELTIE, LL.D. With Maps. Crown 8vo. 105. 64. net.

The Statesman's Year-Book.

ELECTRICAL ENGINEERING IN THEORY AND PRACTICE.

By G. D. ASPINALL PARR, M.Sc., M.I.E.E., A.M.I.Mech. E., Associate of the Central Technical College, City and Guilds of London, Head of the Electrical Engineering Department The University of Leeds. With 282 Illustrations. 8vo.

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MATHEMATICAL PAPERS FOR ADMISSION INTO THE ROYAL
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FOR THE YEARS 1896-1905.
Edited by E. J. BROOKSMITH, B.A., LL.M. Crown 8vo. 6s.

THIRD EDITION NOW READY.
THE CASES OF THE ATMOSPHERE: THE HISTORY OF THEIR DISCOVERY.

By SIR WILLIAM RAMSAY, K.C.B., F.R.S. Extra Crown 8vo. 6s. net.

FOR THE NEW SYLLABUS OF ELEMENTARY SCIENCE. LESSONS IN SCIENCE. A Preliminary Course of Physics and Chemistry. By Professor R. A. GREGORY and A. T. SIMMONS, B.Sc. Illustrated. 35. 6d.

[Tuesday. A MANUAL OF GEOMETRY. By W. D. EGGAR, M.A., Assistant Master

at Eton College. Crown 8vo. 35. 6d.

An experimental treatment of Geometry, in which Theorems are taken along with the practical work.

THE BEGINNER'S SET OF MATHEMATICAL INSTRUMENTS,

Bow Compass ; Dividers ; Two Nickel Set Squares (45° and 60° respectively), 4 inches and 5 inches long. (wo edges of which show inches and tenths and millimetres ; Nickel Protractor ; double bevelled 6-inch Rule showing inches and

tenths and millimetres ; and a Lead Pencil. All enclosed in Metal Pocket-Case. Is, 6d. net. THE DYNAMICS OF LIVING MATTER. By Professor Jacques LOEB. 8vo. 125, 6a. net.

MACMILLAN AND CO., LTD., LONDON.

JUST OUT.
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of

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INSTRUMENTS,

Consisting of 36 Pages of articles by the best makers in the

VARIOUS BRANCHES OF SCIENCE.

Post Free to Readers of “Nature.'
C. BAKER, 244 HIGH HOLBORN, LONDON.

Physical

Apparatus.

THE IRISH NATURALIST.
A Monthly Magazine of Irish Zoology, Botany, and

Geology. Price 6d.
Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD

PRAEGER, B.A.
Annual Subscription, 58. Post Free to any Address.
Dublin : EASON & SON, LTD., 40 Lower Sackville Street

(to which Address Subscriptions should be sent).

BECKER,
Hatton Wall,

LONDON.

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WATKINS & & DONCASTER,

MINERALOGY & PETROGRAPHY.

The bow Spring Price List of Minerals has just been published, and Sent free on application.

Having been able to purchase the extensive and well-known beautiful Collection of tbe late Professor Damour of Paris, containing a great Gember of the rare minerals of old and exhausted occurrences, we can offer an Tarracedinarily great choice of minerals, such as : Amalgam (fine crystals), Enterite, Brogniardite, Churchite, Crednerite, Dechenite, Fluellite, Frieslebenite, Hureaulite, Laurite, Miargyrite, Plagionite, Romeite, Trippkcite, beautiful crystals of Gold and Diamant, and many others.

PRACTICAL PETROGRAPHY, A est book for the use of students, with a short description of the polarising microscope, and a detailed description of our Petrographical Collection of 3. Specimens and Slides of Rocks by Professor Dr. K. Busz of Münster, ananged according to H. Rosenbusch : “ Elemente der Gesteinslehre,'

2nd ed., 1901. « Larze collection of 336 specimens of Rocks, 380 Marks; the 336

olides, 420 Marks. Smolles collection of 250 specimens of Rocks, 270 Marks; the 250

slides, 310 Marks. 1. Smaller collection of 165 specimens of Rocks, 170 Marks; the 165

slides, 205 Marks. Colk tions of Wincrals, Fossils, Jleteorites, purchased for cash

or exchanged.

Naturalists and Manufaoturers of
CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

BRANCHES OF NATURAL HISTORY.
SPECIAL SHOW-ROOM FOR CABINETS.
N.B.-For Excellence and Superiority of Cabinets and Apparatus, refer.
ences are permitted to distinguished patrons, Muscums, Colleges, &c.
A LARGE STOCK OF INSECTS, BIRDS' BOOS AND SKINS.
SPECIALITY.-Objects for Nature Study, Drawing

Classes, &c.
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.

(Five Doors from Charing Cross.)
DE CATALOGUE (102 pp.) POST FREE..

De. F. KRANTZ, Rhenish Mineral Office, Bonn-on-Rhine, Cermany. MICRO. OBJECT MOUNTING.

.

MASON'S PREPARED OBJECTS have 25 years' reputation NOTICE OF REMOVAL.

for quality.

9 Doubly Stained Botanical Sections; 6 Insect Dissections ; 9 Various JAMES R. GREGORY & Co.,

Diatoms (some test); 18 Miscellaneous Specimens.

Full Instructions for Mounting with each ; 1/1 per Series, post free.
MINERALOGISTS, &C.,

List and Sample, 2 Stamps. See notice in NATURE, May 3, page 15.
of KELSO PLACE, KENSINGTON,

R. G. MASON, 69 Clapham Park Rd., London, S.W.

Every Reguisite for Micro. Work, heg to announce that they have removed to more convenient and commodious Premises at

Collections and Single Specimens of 139 FULHAM ROAD, SOUTH KENSINCTON, S.W.

MINERALS, NATURAL CRYSTALS, VOLCANIC DUST

PRECIOUS STONES, ROCKS & FOSSILS. FROM VESUVIUS. Cabinets, Geologists' Hammers, Card Trays, Glass Capped We have a few tubes of this for disposal, 1s. 2d. each,

Boxes, Wood and Glass Models of Crystals and Precious post free.

Stones, Sections of Rocks, and other Apparatus,
NEW and EXTENDED EDITION of TABLE of RARE ELE.

NEW CATALOGUES POST FREE.
MENTS, giðing full scientific particulars, sixpence, post free,
ARMBRECHT, NELSON & CO.,

THOMAS D. RUSSELL, 78 Newgate Street, LONDON, E.C. 71 & 73 Duke Street, Grosvenor Square, London, W.

LIVING SPECIMENS FOR

THE MICROSCOPE.
Volvox, Spirogyra, Desmids, Diatoms, Amccbe, Arcella, Actinospbærium,
Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many
other specimens of Pond Life. Price is. per Tube, Post Free. Helix
pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes.

THOMAS BOLTON,
25 BALSALL HEATH ROAD, BIRMINGHAM.
MARINE BIOLOGICAL ASSOCIATION

OF THE UNITED KINGDOM.

THE LABORATORY, PLYMOUTH,
The following animals can always be supplied, either living
or preserved by the best methods :-

Sycon; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, Alcy.
BECKER,

onium ; Hormiphora (preserved); Leptoplana; Lineus, `Ampbiporus,

Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus,
Hatton Wall,

Gammarus, Ligia Mysis, Nebalia, Carcinus ; Patella, Buccinum, Eledone,
LONDON.

Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus,
Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c.

For prices and more detailed lists apply to
Biological Laboratory, Plymouth.

THE DIRECTOR.

Chemical

Apparatus.

Yearly

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NOTICE.—Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial
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LABORATORY RHEOSTATS. FOR X-RAY WORK

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1

USE THE

TUDSBURY Pneumatic Electric Machine

No. 2. This machine has cylinders 15 inches diameter and is, in power, equal to an ordinary Wimshurst having 10

plates 28 inches diameter. CHEAPEST AND MOST USEFUL FORM OF RESISTANCE FOR EXPERIMENTAL

It will produce a good negative, through the thorax, WORK ON THE MARKET.

of the ribs and spinal column with an exposure of five To regulate PRESSURE and CURRENT, series or shunt, minutes, and will show the bones in various parts of and a variety of other laboratory resistances.

the body distinctly, on the fluorescent screen, when a 16 NEW ILLUSTRATED LIST OF RHEOSTATS suitable tube is used.

(covering various patterns) post free. ISENTHAL & CO.,

86 MORTIMER STREET,
LONDON, W.

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

TOWNSON & MERCER.
We have for disposal
A QUANTITY OF PHYSICAL APPARATUS,
formerly the property of a lately deceased

34 CAMOMILE STREET,
scientific man.
Enquiries invited.

LONDON, E.C.

THE "FLOW" EXTRACTORS

(PATENT APPLIED FOR).

FOCAL PLANE
PHOTOGRAPHY.

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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 and fitted with Series III Goerz

lens for pictures 41 by 31A

B THESE Simple Extractors are much more effective than Scxblets for many purposes,

£15 : 0 : 0 as the substance is kept covered by the solvent in use and a flow of clean solvent is continu. ously movirg directly through the substance,

The Ideal Camera for where by the extraction is greatly facilitated.

instantaneous Price-A, 7/- doz.; B, 8/- doz. C, Complete apparatus, with Condenser (Bur

photographs, gess's Patent), all stoppered together, 7/6.

and equally suitable for Sole Makers

other kinds of work. C. E. MÜLLER, ORME & Co., Ltd.,

Write for CATALOGUE 12a, free from
Scientific Glass Blowers and
Manufacturers of Chemical and

The LONDON STEREOSCOPIC COMPANY, Physical Apparatus, 148 HICH HOLBORN, LONDON, W.C.

106 & 108 Regent Street, W., or 54 Cheapside. CONTRACTORS TO H.M. GOVERNMENT.

с Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the city of London, and published by MACMILAN

AND Co., LIMITED, at St. Martin's Street, London, W.C., and The Macmillan COMPANY, 16 Filth Avenue, New York. — THURSDAY, May 17, 1906.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground

Of Nature trusts the mind which builds for aye."- WORDS WORTH.
No. 1908, VOL. 741
THURSDAY, MAY 24, 1906

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

(All Rights are Reserved.

REYNOLDS & BRANSON, Ltd., This new form

Chemical and Scientific Instrument Makers to His Majesty's

Government (Indian, Home, and Colonial). ADDINC

LABORATORY FURNISHERS and MANUFACTURING CHEMISTS. MACHINE enables one to add up columns of figures very rapidly and sieb absolute accuracy, giving the total 10 L s. d. without any calculation Vay imple,

Smash a child can

lculator. use it. Cannot get out of under. Adds up to £500. Price

42

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NEWTON

CO., Scientific Instrument Makers to H.M. The King

and the Government, 3 FLEET STREET, LONDON.

THE NEW

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NEGRETTI & ZAMBRA'S

"LONDON"

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ELECTRICAL
SELF-RECORDING

MICROSCOPE,

With Eye. piece inch, inch
Object - glasses, in Mahogany

Case,

£5 12s. 6d.

Double Nose-piece, 9/- extra.
Focussing Substage, 14, 6 extra. Illustrated Price List and full particulars post free on

application to
R. & J. BECK, Ltd., NEGRETTI
,

& ZAMBRA,

38 HOLBORN VIADUCT. 68 CORNHILL,

Branches : 45 CORNHILL, and 122 REGENT STREET,

SEPTEMBER MATRICULATION.

BIRKBECK COLLEGE,

UNIVERSITY TUTORIAL COLLEGE

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BREAMS BUILDINGS, CHANCERY LANE, E.C.

FACULTY OF SCIENCE: Day and Evening Classes for the September Matriculation

DAY AND EVENING COURSES, under Recognised Teachers of of London University may be taken up at any time, as the

the University of London. Classes at

(ALEX, McKenzie, Ph.D., D.Sc, Chemistry

M.A. (H. WREN, Ph.D., B.A., B.Sc.

ALBERT GRIFFITHS, D.Sc. Physics ...

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

B. W. CLACK, B.Sc. work continuously through the Summer vacation. Fifty-two Mathematics

SE. H. SMART, M.A.

IC. V. Coates, M.A. successes at January Matriculation.

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

(F. E. FRITSCH, Ph.D., D.Sc. Classes in PRACTICAL CHEMISTRY, PHYSICS, Zoology...

H. W. UNTHANK, B.A., B.Sc.

Qeology & Mineralogy Geo. F. HARRIS, F.G.S. BIOLOGY AND GEOLOGY are held during August.

Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M.

RESEARCH in Chemistry and Physics in well-equipped laboratories. Prospectus may be had, post free, from the Vice-PRINCIPAL, French, German, Spanish, Russlan, and Itallap Classes. University Tutorial College, Red Lion Square, Holborn.

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.
COUNTY BOROUGH COUNCIL OF
LIMERICK.

B.A. AND

B.Sc. EXAMS. CARNEGIE LIBRARY AND MUSEUM.

MATRICULATION, INTERMEDIATE, FINAL.

PREPARATION by CORRESPONDENCE (Residence abroad mus The Free Library Committee invite applications from qualified persons impediment) or ORAL TUITION on a THOROUGHLY INDIto fill the position of CURATOR of the MUSEUM and DIRECTOR of VIDUAL SYSTEM. Fees based on success. the LIBRARY, at a Salary of £110 (one hundred and ten pounds) per

The STAFF includes Graduates of Oxford, Cambridge, London, and annum, with a new residence adjoining the Library, containing two recep

Royal Universities, Science Medallists, Prizemen, Scholars, &c. tion rooins, four bed rooms, bath room, &c., with electric light and water laid on, free. Limit of age, 25 to 45 years. Candidates will be expected

SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, to have a liberal education, including a knowledge of French and Latin,

Psychology, Political Economy, Latin, Greek, French, German, &c. and to give particulars of the examinations they have passed. A special For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oxon.). written and oral examination of candidates whose qualifications have been Burlington Correspondence College, Clapham Common, London, S.W. approved of will be held in the following subjects, viz. :-The Irish Language, up to the standard of the Pass Degree of the Royal University, Irish History, Irish Antiquities, Bibliography, Freehand Drawing (ele.

MUNICIPAL TECHNICAL SCHOOL, mentary). Applications, accompanied by copies of testimonials as to

LEICESTER. character, &c., will he received by me not later than Monday, June 11 prox. Canvassing will be a disqualification.

Headmaster-J. H. HAWTHORN, M.A. (By Order), WM. M. NOLAN, Town Clerk, WANTED, for September 1, a MATHEMATICAL MASTER,

Hon. Sec. Free Library Committee. Graduate preferred. Previous experience in a similar Institution an Town Clerk's Office, Limerick, May 19, 1905.

additional recommendation. There are day and evening classes, and all students are over 15 years of age.

Commencing salary, 6150 per annum.

Applications should be sent in by June 9 on the printed form to be EGYPTIAN GOVERNMENT SCHOOLS. obtained from

T. GROVES, Secretary. In view of the extension of Secondary Education in Egypt, applications Canvassing will disqualify. are invited for new ASSISTANT-MASTERSHIPS in Secondary Schools Education Offices, Town Hall, Leicester, under the Ministry of Education. Masters to begin work in October, in

May 22, 1906. Cairo or Alexandria, and to teach in English exclusively. Over 400 boys in each School, mainly Mohammedans. In the case of iwo of the Masters now required, the subject mainly essential is Science (Experimental Physics UNIVERSITY OF BIRMINGHAM. and Chemistry); six of the new Masters will be principally engaged in teaching Mathematics; the others will be concerned more particularly with

TWO ASSISTANT LECTURESHIPS IN MATHEMATICS. the teaching of English, including History and Geography. Candidates The Council invites applications for the above appointments. Stipends, should be not less than 23 nor over 30 years of age, bave a robust consti.

£175 and £150 per annum, respectively. tution, and have taken a University Degree in Honours. They should have experience as Teachers : preference will be given to applicants who hold a

Applications, accompanied by testimonials, should be sent to the under Diploma in Teaching. Salary, 6295 per annum (Eg.24 per mensem),

signed not later than Tuesday, June 5, 1906. rising to £393 per annum (£Eg.32 per mensem). Allowance for passage

The candidates elected will be required to enter upon their duties on out to Egypt. "Teaching hours, on an average, four daily, Fridays only

October 1, 1906. excepted. Summer vacation not less than two months.

Further particulars may be obtained from Applications, with full statement of qualifications and accompanied by

GEO. H. MORLEY, Secretary. 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 BIRKBECK COLLEGE.--BOTANY.candidates may apply for further information.

There will be a vacancy in September for a HEAD of the BOTANY
DEPT. At present the appointment is not full time, but for three

mornings (or afternoons) and three evenings per week. Salary proBOROUGH OF HASLINGDEN.

posed, 6200. Candidates should state academic and other qualifica

tions, age and experience in teaching, and should enclose not more than MUNICIPAL SECONDARY SCHOOL.

three testimonials.- Apply (not later than June 5) to PRINCIPAL,

Birkbeck College, Breams Buildings, Chancery Lane, E.C. WANTED, SENIOR MISTRESS, especially qualified in French. Commencing salary, £120, rising by biennial increments of £10 to £160 per BEDFORD COLLEGE FOR WOMEN. annum, with further increments not automatic on special recommendation. ASSISTANT MISTRESS ; commencing salary, £100 per annum, rising

(UNIVERSITY OF LONDON.) by biennial increments of £10 to 6135 per annum, and by further increments not automatic on special recommendation.

YORK PLACE, BAKER STREET, W. Candidates for either position must be graduates or possess equivalent

The Council are about to appoint a DEMONSTRATOR in CHEMIS. qualifications.

TRY. Applications, with testimonials, to be sent in by June 20 to the Applications, endorsed * Senior Mistress" or Assistant Mistress

SECRETARY, from whom particulars can be obtained. the case may be, stating age, qualifications, experience and when dis

HILDA WALTON, Secretary. engaged, and accompanied by copies only of three recent testimonials. to be sent to the undersigned not later than Tuesday, the 29th day of May Wanted, a competent Draughtsman, to take instant.

occasional work in drawing diagrams (scientific and technical) for bookWALTER MUSGROVE, Town Clerk. work. - Apply, stating qualifications and terms per hour, to "S. E.,"

as

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