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THE ROYAL INSTITUTE OF PUBLIC

HEALTH.
PATRON-HIS MAJESTY THE KING.

PUBLIC HEALTH LABORATORIES.
The Council are prepared to receive applications in connection with their
new Laboratories for the following offices :

1. DEMONSTRATOR OF BACTERIOLOGY.

2. DEMONSTRATOR OF CHEMISTRY. Further particulars to be obtained of the SecrETARY, 19 Bloomsbury Square, W.C.

BAUSCH & LOMB'S CENTRIFUGES

CITY OF BIRMINGHAM EDUCATION

COMMITTEE. The Committee requires the services of an ASSISTANT MISTRESS as a Peripatetic Teacher of Science. Salary, 6100 to £130 per annum, according to qualifications and experience. Candidates should be qualified in Hygiene and Laws of Health. Form of application may be obtained from the undersigned.

JNO. ARTHUR PALMER, Secretary. Education Department, Edmund Street, November 7, 1904.

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As supplied to H.M. War Department & the Medical Profession

TWO SPEED CENTRIFUGE, complete with Haematokrit, Uribe and Sputum Sedimentation

Apparatus,
£3 3 0.

(As illustrated.)
SINGLE SPEED CENTRIFUGE,

complete with Urine Sedimentation Attachmen,

£2 0 0.
The only Centriluces havini
Spiral Gear. They r quire hal
the power of other makes 1
run them at a given speed.
THE MOST PERFECT INSTRUMENTS

MADE.
PLEASE WRITE FOR SPECIAL LIST.

Write for Illustrated Microscopical Catalogue, 3 Stamps to cover postage. Also Lists of Microtomes, Centrifuges. Photographic Shutters, ad

Lenses of all descriptions, to A. E. STALEY & CO., 19 THAVIES INN, HOLBORN CIRCUS,

LONDON, E.C.
COX'S

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BEDFORD COLLEGE FOR WOMEN.

(UNIVI RSITY OF LONDON.)

YORK PLACE, BAKER STREET, W.
The Council are about to appoint a Lady as HEAD of the TRAINING
DEPARTMENT.

Applications must be sent by November 25 to the SECRETARY of the
College, from whom further information may be obtained.

H. WALTON, Secretary.

OLDBURY SECONDARY SCHOOL AND

PUPIL TEACHERS' CENTRE. The Governors require, after Christmas, an ASSISTANT MASTER to teach ordinary Form Subjects and Science or Mathematics. Salary, 6120 per annum.

Further particulars may be obtained from the SECRETARY, to whom applications should be forwarded on or before November 26, 1904.

H. A. ANDERSON, Secretary. Technical Schools, Oldbury.

UNIVERSITY COLLEGE OF WALES,

ABERYSTWYTH.
ASSISTANT LECTURESHIP IN MATHEMATICS.
The Council invite applications for the post of ASSISTANT
LECTUREK in MATHEMATICS at the above College. Applications,
Togeil er with copies of testimonials, must reach the undersigned, from whom
full par iculars may be obtained, not later than Monday, December 5, 1904.

T. MORTIMER GREEN, Registrar.

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APPLICATIONS to fill a vacancy at present

existing are invi'ed from thoroughly competent yourg men, experienced in the various departments of a wh lesale house, and with pharma. ceutical qualifications. Essential requirements are-First rate bu-iness abilities. Te ou ce, initiative enerzy, power of organisation and leen commercial instincts. A progressive position for a clever and energetic

dinini.trator, capable of assuming control of a complete staff. Personal i ter jewecessary. Full articulars of experience age, and saları r quireil in 'DE X.1," West Enl Advertising Agency, Lid., 19; Oxford Street, W.

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Fim" to 50"

spark.

Practically Everlasting.

OWEN'S SCHOOL, ISLINGTON. WINTED in January, PHYSICS MASTER and CHEMISTRY MASTER. Must have had experience in good laboratories, and be able to lecture and illustrate by experiments in an efficient manner.

There are

HARRY W C0.X LTD Two Science Masters on each side. Cominencing salary, £150. Apply at once, giving age, qualification, experience, and copies of ihree recent testimonials, to the HEAD MASIER. Substantial English Company desires to

COX'S INDUCTION COILS extend its business by acquiring the British and Colonial rights of a We have now added a Special Department for the new Chemical Product which is likely to be used on a very large scale for Industrial purposes. Advertisers have exceptional facilities

manufacture of for expoluiting an invention of this kind. Offers, with full particulars,

ACCUMULATORS, to be sent to B 101, 1. B. Browne's. Advertising Offices, 163 Queen cnabling us to produce same at first cost combined vi tot a Street, E.C.

with large output and great durability.

NEW ILLUSTRATED CATALOGUE Required by Manufacturer of Scientific

(including Instructions to Beginners) Post Free. Intiments, a Assistant, to take charge of adjustment of highly 2 curale Resistar.ce Coils. One having technical training preserred

HARRY W. COX, Ltd., Actual Manufacturers. Bux 28, c/o Nature.

FACTORY AND OFFICES:

la ROSEBERY AVENUE, & 15-21 LAYSTALL ST., LONDON, E.C. For other Scholastic divertisements, see page x.

(Removed from Cursitor Street.)

Radium Clocks. RADIUM

2,000,000 Unit Strength.

EMANIUM

use.

AVING made a special study of these

instruments, we are in a position to
supply :-

2 tubes of 5 mgs. each and 1 tube of 24 mgs. 1. For the Lecture

ON HIRE.
Table
(as illustrated).

A new radio-active substance from 2. For Lantern Slide

Pitchblende. It gives large and more

effective sparks on a phosphorescent Price, according to quantity

screen than Radium or Polonium, and of Radium, will be quoted is considered better for the Spinby return post.

thariscope. We make a special feature of CHEMICALS

A few decigramme tubes for sale at

30/- the decigramme. AND APPARATUS of all kinds.

PRICE LIST FREE.
RADIUM ON HIRE. TERMS ON APPLICATION.

Sample Bottle 1/6 Post Free.
W. MARTINDALE,
MANUFACTURING CHEMIST,

ARMBRECHT, NELSON & CO.,
10 NEW CAVENDISH ST., LONDON, W. 71, 73 DUKE ST., GROSVENOR SQ., LONDON, W.
DARTON'S
DARTON'S

GLEW'S SCINTILLOSCOPE

(PATENT). NEW REVERSING POCKET VOLTMETER

Shows a magnificent display of scintillations, With Patent Shunt.

showers of sparks, direct from the mineral PitchELECTRIC MOTOR

blende, Radium, Polonium, Uranium, Thorium, or any radio-active substance, even a Welsbach mantle con

tains sufficient Thorium to excite the very sensitive as well with current of 8 volts only.

screen of the Scintilloscope, which is far more sensi. tive than the Spinthariscope. The Scintilloscope rivals the most delicate Electroscope as a detector of Alpha rays.

The eye sees an inexhaustible shower of stars of PITCH BLENDE white light, giving a very realistic idea of the ceaseless

activity of these marvellous substances which are producing the terrific bombardment causing this beautiful display.

See NATURE, September 29, page 535.
Glew's Scintilloscope Superior Lens, with Extra-sensitive Pitchblende and

Polonium Screens, giving brilliant effects, Complete, 75. 6d., Post free,

U.K. Foreign Postage extra, weight 2 ounces.

Pieces of Pitchblende mineral, ground flat and polished, with Sensitive PRICE 36/

Screen attached, for use in Scintilloscope or with any strong pocket Ir Hustrated Electrical List Post Free.

magnifier, from 75. 6d. each, according to size.

Radio-active supplies of every description, on Sale or Hire. Radium F. DARTON & CO., Clerkenwell Optical Works,

Bromide, 1,800,000 units on hire for lectures.

F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900), 142 ST. JOHN STREET, LONDON, E.C.

156 Clapham Road, London, S.W.

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RADIO-ACTIVE MUD

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(CONSTANT DEVIATION). The special advantages of this Spectroscope are—the Collimator and Telescope are fixed at right angles, thus the instrument will stand in a corner, and is always ready for use and in adjustment.

The Prism is of special form and automatically sets itself at minimum deviation,

READS IN WAVE-LENGTHS DIRECT & WITH CREAT ACCURACY. Descriptive Pamphlet of this Spectroscope Post Free on application.

GOLD MEDAL AWARDED, ST. LOUIS EXHIBITION, 1904. ADAM HILGER, Ltd., 75a Camden Road, London, N.W.

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Apparatus or estimation of sulphur in spent oxide.

SECOND-HAND

APPARATUS

Importers, Manufacturers, and Dealers in
CHEMICAL AND PHYSICAL

APPARATUS
Of every Description.
Pine Chemicals, Volumetric Solutions,

Plain and Stoppered Bottles, AND EVERY LABORATORY REQUIREMENT. Illustrated Catalogue of Apparatus, with Price

List of Chemicals, free on application. Telegraphic Address—"APPARATUS, MANCHESTER."

Telephone Number—2238.

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TO SCIENCE LECTURERS. HUGHES' PHOTO • ROTOSCOPE CINEMATOGRAPHS.

THE MOST PERFECT. No Flickering. Superb Mechanism. Price £7 7 0. The Moto-Photo Camera for taking the Pictures.

Illustrated Lists, 2d. See Mr. HUGHES' PATENT COMBINATION OPTICAL LANTERN, &c. Miniature Triple Lantern constructed for B. J. MALDEN, Esq. ; grea: success. New Oxyhydrogen Microscope. Science Lanterns for Class D.. monstration. Magnificent Results. Docwra Triple, Prize Medals, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATIAN GUINNESS, &c. Patent Pamphengo Science Lanterns. The Universal Lintern 4-inch Condensers, 4-wick Lamp, Portrait Combination front Lenses, 185. 6d. Marvellous value. Science Lecture Sets. Novelties. The Lantern Kaleidoscope. Cheapest Lantern Outfits in the World. Grandly Illustrated Catalogue, over 180 choice Engravings, 6d. Postage, 4d. Small Illustrated Catalogue, 100 pages, free, 5d. List of 60,000 Slides and 300 Lecture Sets, Science Subjects, Views, &c., 6d.; Postage, 2d. Pamphlets Free. W. C. HUGHES, SPECIALIST, Brewster House, 82 Mortimer Road, Kingsland, N.

ELECTRICAL
AND PHYSICAL
BY STANDARD MAKERS, IN PERFECT WORKING ORDER, AT

EXTREMELY MODERATE PRICES.
As supplied to the National Physical Laboratory; Aberdeen, Aberystwyth,
Birmingham, Nottingham and Glasgow Universities; Bedford, Bradford,
Clifton, Heriot Watt and Yorkshire Colleges; and twenty other Scientifs

Institutions, Polytechnics, &c. NATURB says: “Teachers requiring efficient apparatos at a low cost for lecture or laboratory purposes, might consult the list witb advantage.''

List or application by mentioning NATURE. DRAWING INSTRUMENTS.

Best Make and Finish.
SET SQUARES,

T SQUARES,
DRAWING BOARDS.

Obtained through any Optician. ROBERT NICHOLL, 153 HIGH HOLBORN, LONDON.

ARGON and HELIUM.
SPECTRUM TUBES,

showing true spectrum. MANUFACTURED ON THE PREMISES.

Price 15s. each.
Sealed Tubes containing 100 c.cm.

Argon or Helium, 258. each.

Awarded Gold Medal at St. Louis Exhibition A. C. COSSOR, 54 Farringdon Road, E.C. THE "SIRIUS” WATER-COOLING AND RECULATING TUBE.

Sole Maker
H. HELM,
66 Hatton Garden,

London.
Glass Blower and
ACTUAL MAKER

of all kinds of
X-Ray and Vacuum

Tubes, &c.

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SCIENTIFIC WORTHIES

A List of this Series of Steel and Photogravure Portraits of Men of Science will be sent post free

to

any reader of “Nature"

on

application to the Publishers.

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ST. MARTIN'S STREET, LONDON, W.C.

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W. G. PYE & CO.. ,

Prices and further particulars upon application. SUBSTANTIAL APPARATUS FOR TEACHING AND RESEARCH

A SPECIALITY.
Large Stock kept, ensuring prompt delivery.

HIBBERT'S PATENT MAGNETIC BALANCES, STANDARD Sole

MAGNETS AND BALLISTIC GALVANOMETERS.
Maker's of

MURRAY'S PATENT ANGLEMETER.
TUDSBURY'S PATENT ELECTRICAL INFLUENCE MACHINE.

RADIUM IN 5 Mgr. TUBES FOR SALE OR ON HIRE.

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MR. EDWARD ARNOLD'S NEW BOOKS.

. THE CHEMICAL SYNTHESIS

OF VITAL PRODUCTS

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net.

AND THE
INTER-RELATIONS BETWEEN ORGANIC COMPOUNDS

By R. MELDOLA, F.R.S., Y.P.C.S., F.I.C., &c.,
Professor of Chemistry in the City, and Guilds of London

Technical College, Finsbury.

Super Royal 8vo.
THE BECQUEREL RAYS
AND THE PROPERTIES OF RADIUM.

By the Hon. R. J. STRUTT,

Fellow of Trinity College, Cambridge. Demy 8vo.

With Diagrams. 8s. 6. net.

AN INTRODUCTION TO
THE THEORY OF OPTICS.
By ARTHUR SCHUSTER, Ph.D., Sc.D., F.R.S.,
Professor of Physics at the University of Manchester.

Demy 8vo. With numerous Diagrams. 155. net.
ENGLISH ESTATE FORESTRY.

By A. C. FORBES,
Lecturer on Forestry, Durham College of Science.
Demy 8vo.

With Illustrations. 128. 6d. net.
THE ELECTRIC FURNACE.

By HENRI MOISSAN,
Professor of Chemistry at the Sorbonne.
Translated by A. T. de MOUILPIED, M.Sc., Ph.D.
Demy 8vo. With numerous Illustrations. 1os. 6d. net.
London: EDWARD ARNOLD, 41 & 43 Maddox Street, W.

THE NEW "STUDENT'S"
STANDARD BAROMETER.

(Rd. No. 420,297.)
This Instrument has been designed to meet the re-
quirements of Students and others who find the need of
a Barometer which will give exact readings, and
cost but a moderate sum.

It appeals especially to Colleges and Schools for Demonstration purposes,

The construction is on that of the well-known" Fortin" principle. The level of the cistern mercury is reducible to zero, in exactly the same manner as in the more expensive forms.

The diameter of the mercurial column is '25 inch, and affords a bold, well-defined reading. The scales, by means of the double vernier, are capable of being read to 'on inch and 1 millimetre. It is mounted on a wellpolished, solid mahogany board, with plates for attachment to wall, opal glass reflectors for reading off, and screws for vertical adjustment.

The metal portions are all well bronzed and lacquered, and the scales are silvered brass.

We confidently recommend this Instrument for use as a "Standard in Colleges and Schools, private Observatories, and by Gas and other Engineers. Price, complete, mounted as illustrated,

£3 7 6 each, or may be had with one scale (either inches or millimetres), and with thermometer on other scale, at same price.

I NATURE says :-“Provides an accurate instroment at a moderate cost."

FULL SIZE STANDARD BAROMETER of same design, bore oʻs" diameter, inches and millimetre scales, verniers reading to o'002 inch and oʻ1 mm, ou polished mahogany board with brackets and opal glass reflectors, £7 10 0 Sole Manufacturers and Proprietors of the

Registered Design. PASTORELLI & RAPKIN, LTD.

46 HATTON GARDEN, LONDON, E.C. WHOLESALE MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS.

Contractors to H.M. Government. Estd. 1750. Telegrams," Rapkin, London." Telephone, 1981 Holborn

1/10th scale.

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SCHLEUSSNER'S SPECIAL RAPID PLATES

EXTREMELY RAPID WORK.

1/100,000 SECOND.

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ELEVENTH EDITION. REVISED AND ENLARGED. Cloth.

A TREATISE ON MINE SURVEYING.
FOR THE USE OF MANAGERS OF MINES AND COLLIERIES,
STUDENTS AT THE ROYAL SCHOOL OF MINES, &c.

By BENNETT H. BROUGH, F.G.S., A.R.S.M.
"Its clearness of style, lucidity of description, and fulness of detail have
long ago won for it a place unique in the literature of this branch of mining
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(For observatories and scientific work generally) In Crown 8vo, with nearly 300 Illustrations. 75. 6d. net.

ARE THE BEST OBTAINABLE FOR
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AN INTRODUCTORY TEXT BOOK FOR MINING STUDENTS.

By Sir C. LE NEVE FOSTER, D.Sc., F.R.S.
"A remarkably clear survey of the whole field of mining operations."—
Engineer,

PROJECTILES HAVE BEEN TAKEN ON THESE In Crown 8vo. Handsome Cloth. 200 Illustrations. 38. 6d.

PLATES WITH AN EXPOSURE OF
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The following is one of the many testimonials to the value of

these Plates for scientific work:THE CYANIDE PROCESS OF COLD EXTRACTION.

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