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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. 125. net.

A HANDBOOK OF BRITISH INLAND BIRDS.

By ANTHONY COLLETT. With Coloured and Outline Plates of Eggs by ERIC PARKER. Crown 8vo. 65. 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.

The Statesman's Year-Book.

Statistical and Historical

Annual of the States of the World. Edited by J. SCOTT KELTIE, LL.D. With Maps. Crown 8vo. 10s. 6d. net.

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.

I25. net.

MATHEMATICAL PAPERS FOR ADMISSION INTO THE ROYAL MILITARY ACADEMY AND THE ROYAL MILITARY COLLEGE FOR THE YEARS 1896-1905.

Edited by E. J. BROOKSMITH, B.A., LL.M. Crown 8vo. 65.

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.

A MANUAL OF GEOMETRY.

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

Tuesday.

By W. D. EGGAR, M.A., Assistant-Master

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, two 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. 12s. 6d. net.

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MINERALOGY & PETROGRAPHY. The new Spring Price List of Minerals has just been published, and will be sent free on application.

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

PRACTICAL PETROGRAPHY.

A test-book for the use of students, with a short description of the polarising microscope, and a detailed description of our Petrographical Collection of 136 Specimens and Slides of Rocks by Professor Dr. K. Busz of Münster, arranged according to H. Rosenbusch: "Elemente der Gesteinslehre," 2nd ed., 1901.

• Large collection of 336 specimens of Rocks, 380 Marks; the 336 lides, 420 Marks.

Smaller collection of 250 specimens of Rocks, 270 Marks; the 250 studes, 310 Marks.

1. Smaller collection of 165 specimens of Rocks, 170 Marks; the 165 slides, 205 Marks.

Coilsitions of Minerals, Fossils, Meteorites, purchased for cash

or exchanged.

WATKINS & DONCASTER,

Naturalists and Manufacturers 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, Museums, Colleges, &c.
A LARGE STOCK OF INSECTS, BIRDS' EGGS 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.)
CATALOGUE (102 pp.) POST FREE.

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

ESTABLISHED 1833.

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OBJECT MOUNTING.

MASON'S PREPARED OBJECTS have 25 years' reputation for quality.

9 Doubly Stained Botanical Sections; 6 Insect Dissections; 9 Various Diatoms (some test); 18 Miscellaneous Specimens.

Full Instructions for Mounting with each; 1/1 per Series, post free. List and Sample, 2 Stamps. I See notice in NATURE, May 3, page 15. R. G. MASON, 69 Clapham Park Rd., London, S.W. Every Requisite for Micro. Work.

Collections and Single Specimens of

MINERALS, NATURAL CRYSTALS,
PRECIOUS STONES, ROCKS & FOSSILS.
Cabinets, Geologists' Hammers, Card Trays, Glass Capped
Boxes, Wood and Glass Models of Crystals and Precious
Stones, Sections of Rocks, and other Apparatus.

NEW CATALOGUES POST FREE.

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THOMAS D. RUSSELL, 78 Newgate Street, LONDON, E.C.

LIVING SPECIMENS FOR

THE MICROSCOPE.

Volvox, Spirogyra, Desmids, Diatoms, Amœba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Štephanoceros, Melicerta, and many other specimens of Pond Life. Price 18. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, 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-
onium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus,
Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus,
Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone,
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.

NATURE should be addressed to the Publishers; Editorial of NATURE is "PHUSIS," LONDON.

CHARGES FOR ADVERTISEMENTS.

£ s. d. TO ALL PLACES ABROAD:- £ s. d.

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o 15 6 One Sixteenth Page, or Eighth Col. 10

One Eighth Page, or Quarter
Column

• The first line being in heavy type is charged for as Two Lines.

Cheques and Money Orders payable to MACMILLAN & CO., Limited.
OFFICE: ST. MARTIN'S STREET, LONDON, W.C

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CHEAPEST AND MOST USEFUL FORM OF RESISTANCE FOR EXPERIMENTAL

WORK ON THE MARKET.

and a variety of other laboratory resistances.

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.

It will produce a good negative, through the thorax, 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 the body distinctly, on the fluorescent screen, when a suitable tube is used.

NEW ILLUSTRATED LIST OF RHEOSTATS (covering various patterns) post free.

ISENTHAL & CO.,

85 MORTIMER STREET,
LONDON, W.

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

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A

(PATENT APPLIED FOR).

B

THESE Simple Extractors are much more

effective than Scxhlets for many purposes, as the substance is kept covered by the solvent in use and a flow of clean solvent is continu. ously moving directly through the substance, where by the extraction is greatly facilitated. Price-A, 7/- doz.; B, 8/- doz. C, Complete apparatus, with Condenser (Burgess's Patent), all stoppered together, 7/6. Sole Makers

C. E. MÜLLER, ORME & CO., Ltd.,

Scientific Glass Blowers and
Manufacturers of Chemical and
Physical Apparatus,

148 HICH HOLBORN, LONDON, W.C.

CONTRACTORS TO H.M. GOVERNMENT.

C

SOLE AGENTS

TOWNSON & MERCER.

34 CAMOMILE STREET,

LONDON, E.C.

FOCAL PLANE
PHOTOGRAPHY.

The Stereoscopic New "Focal Plane Standard" is the smallest practical Camera made fitted with a Shutter giving exposures 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 4 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.

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 AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, May 17, 1905.

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Library

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ELECTRICAL
SELF-RECORDING
RAIN-GAUGE.

BECK

Case,

£5 12s. 6d.

Double Nose-piece, 9/- extra.

Focussing Substage, 14 6 extra.

NECRETTI ZAMBRA.

Illustrated Price List and full particulars post free on application to

R. & J. BECK, Ltd., NEGRETTI & ZAMBRA,

68 CORNHILL,

38 HOLBORN VIADUCT.

Branches: 45 CORNHILL, and 122 REGENT STREET,

SEPTEMBER MATRICULATION.

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

work continuously through the Summer vacation. successes at January Matriculation.

Fifty-two

Classes in PRACTICAL CHEMISTRY, PHYSICS, BIOLOGY AND GEOLOGY are held during August. Prospectus may be had, post free, from the VICE-PRINCIPAL, University Tutorial College, Red Lion Square, Holborn.

COUNTY BOROUGH COUNCIL OF
LIMERICK.

CARNEGIE LIBRARY AND MUSEUM.

The Free Library Committee invite applications from qualified persons to fill the position of CURATOR of the MUSEUM and DIRECTOR of the LIBRARY, at a Salary of £110 (one hundred and ten pounds) per annum, with a new residence adjoining the Library, containing two reception rooms, 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 to have a liberal education, including a knowledge of French and Latin, and to give particulars of the examinations they have passed. A special written and oral examination of candidates whose qualifications have been 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 mentary). Applications, accompanied by copies of testimonials as to character, &c., will he received by me not later than Monday, June 11 prox. Canvassing will be a disqualification.

(By Order),

WM. M. NOLAN, Town Clerk,
Hon. Sec. Free Library Committee.

Town Clerk's Office, Limerick, May 19, 1905.

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 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 engaged in teaching Mathematics; the others will be concerned more particularly with the teaching of English, including History and Geography. Candidates should 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 experience as Teachers: preference will be given to 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 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.

BOROUGH OF HASLINGDEN.

MUNICIPAL SECONDARY SCHOOL.

WANTED, SENIOR MISTRESS, especially qualified in French. Commencing salary, £120, rising by biennial increments of £10 to £160 per annum, with further increments not automatic on special recommendation. ASSISTANT MISTRESS; commencing salary, 100 per annum, rising by biennial increments of £10 to £135 per annum, and by further increments not automatic on special recommendation.

Candidates for either position must be graduates or possess equivalent qualifications.

Applications, endorsed "Senior Mistress" or "Assistant Mistress" as the case may be, stating age, qualifications, experience and when dis 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 instant.

WALTER MUSGROVE, Town Clerk.

Municipal Offices, May 15, 1906.

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MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE (Residence abroad no 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.

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