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NOTICE.-Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial
Communications to the Editor. The telegraphic address of Nature is “ Phusis,” LONDON.
SUBSCRIPTIONS TO " NATURE."

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OFFICE: ST. MARTIN'S STREET, LONDON, VVC.

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TOWNSON & MERCER.

ESTABLISHED 1798 (OVER A CENTURY),

OUR
UR important announce.
ment to all users of

DIAS Induction Coils promised for this issue of

Nature is unavoidably postponed, but we hope to make same at an early date, and advise readers to look

out for it.

RETAIL-89 BISHOPSCATE STREET WITHIN, E.Č. WHOLESALE-34 CAMOMILE STREET.E.C.

Scientific Apparatus Manufacturers and Laboratory Outfitters to the Home and Colonial Departments of H.M. Government, Scientific Institutions, Colleges, and the various Industries throughout the World,

THE

NEW PATENT GAS LIGHTERS

OF

In the Press. Ready Shortly. NEW ILLUSTRATED CATALOGUE

By means of these lighters, which are ELECTRICAL

simply held over the gas when turned on, MEASURING

matches are done away with, and there INSTRUMENTS,

is no danger of fire. They can be carried

in the waistcoat pocket, LABORATORY RHEOSTATS.

Price 1/- each. Applications invited for its receipt post fre- on publication. As convenient as switching on the Electric Light.

INCLUDING

ISENTHAL & CO., TOWNSON & MERCER,

34 CAMOMILE STREET, E.C.

85 MORTIMER STREET, LONDON, W. Contractors to the Admiralty, War, India, S+ Colonial Offices. &c.

LATEST IMPROVED FOR

FORM

THE STEREOSCOPIC COMPANY'S

DOUBLE-SURFACE ARTIST'S
CONDENSER.

REFLEX

CAMERA

Overcomes the many disadvantages of
previous patterns, which militate to a
great extent their usefulness and gen-
eral adoption in laboratories.

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Patent applied for.

The finest possible instrument for all praetical. purposes, embodying every scientific requirement...

TO
PUMP

Answers equally well for distillations with direct steam, ordinary distillations, or under reduced pressure. Easily cleansed by removing inner condensing tube.

In case of breakage (chances of which are reduced to a minimum), any part may be readily renewed at very small cost, or, in fact, replaced from the stores of any ordinary laboratory.

May be used in any position, with or without vacuum.

Takes less than one-third the bench room of an ordinary Liebig type condenser.

For distillations under reduced pressure, where fractions have to be separated, the fractionating

The Ideal Camera for BIRD PHOTOGRAPHY, NATURAL end (as shown in Fig.) will be found extremely useful and convenient.

HISTORY SUBJECTS, PORTRAIT AND FIGURE

STUDIES, ARCHITECTURAL & GENERAL WORK. Condenser, 5/6; Fractionating End, 10/6; Complete Apparatus (as shown), 207-.

Write for full particulars from ... SOLE MAKERS

THE LONDON STEREOSCOPIC COMPANY, C. E. MÜLLER, ORME & CO., Ltd.,

106 & 108 REGENT ST., W., or 54 CHEAPSIDE, E.C. 148 HIGH HOLBORN, LONDON.

ESTABLISHED OVER 60 Years. Printed by Richard CLAY AND SONS, LIMITED, at 7 & 8 Lread Street Hill, Queen Victoria Street, in the City o London, and published by MACMILLA

AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York. - THURSDAY, Feb. 9. 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.

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No. 1842, Vol. 71) THURSDAY, FEBRUARY 16, 1905.
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

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REYNOLDS & BRANSON, Ltd,
Chemical and Scientific Instrument Makers to His Majesty's

Government (Indian, Home, and Colonial).
LABORATORY FURNISHERS and MANUFACTURING CHEMISTS.

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CYLINDRICAL ELECTRIC

LANTERN.

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NEWTON & CO., Opticians to the King,

3 FLEET STREET, LONDON.

CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied to National Physical Laboratory, Teddington, fitted for Gas, Water

and Electricity
Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200

Illustrations, free on application.
DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS.

14 COMMERCIAL STREET, LEEDS.

THE NEW BOOK

NEGRETTI & ZAMBRA'S

SELF-RECORDING METEOROLOGICAL INSTRUMENTS.

PRICE ONE SHILLING.

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Containing an original description of the principles and function of the photographic lens. Together with the

latest workshop methods. Then there follows a series of chapters on practical photography and the effect of lenses on results. The chief types are discussed and compared by means of original diagrams. Also an appendix on the Gauss Theory and on a new system of lens testing. The book

is entitled
"PHOTOGRAPHIC LENSES:

A SIMPLE TREATISE."
By CONRAD BECK and HERBERT ANDREWS.

POST FREE 1/3
350 Pages, 45 Engravings, 150 Diagrams, Cloth Bound.

EDITION DE LUXE, 3/6 POST FREE.
R. & J. BECK, Ltd., 68 CORNHILL, LONDON.

THE NEW PATTERN COMBINED BARO-THERMOGRAPH. The above instrument combines in one apparatus the Recording Baro. meter and Recording Thermometer, giving thus on one and i he same chart continuous records of the atmospheric pressure and temperature for seven days.

VERY SUITABLE FOR PRESENTATION, Illustrated Price List of Self-Recording Meteorological Instruments, or “Special" Ilustrated List of Scientific goods suitable for

Presents, Post Free to all parts of the World. 38 HOLBORN VIADUCT, E.C. Branches-45 CORNHILL, and 122 REGENT STREET.

..

JA. B

W.H. DAVISON, M.A., Clerk to the Governing Body.

UNIVERSITY OF BIRMINGHAM. BIRKBECK C
Faculties.

BREAMS BUILDINGS, CHANC
SCIENCE, ARTS, MEDICINE, COMMERCE.

FACULTY OF SC
SPECIAL SCHOOL OF MODERN LANGUAGES.
DEPARTMENT FOR TRAINING OF TEACHERS.

DAY AND EVENING CO
Scbools of -

Chemistry
ENGINEERING, METALLURGY, MINING, BREWING,

ALPES
Physics ...

D. Op
DENTISTRY,

B. W
Leading to Degrees and Diplomas.

Mathematics

W.G. All COURSES AND DegreeS ARE OPEN TO BOTH MEN AND WOMEN

Botany ... STUDENTS.

FE In the Medical School there is a separate Dissecting Room for Women

Zoology ..

H. W with a qualified Woman Demonstrator.

Geology & Mineralogy

Geo.

Assaying, Metallurgy & Mining. Graduates of other Universities may, after two years' study or research, take a Master's Degree.

RESEARCH in Chemistry and Physics in well! Syllabuses with all information will be sent on application to the

French, German, Spanish, Russian, Dut.
SECRETARY.

EVENING CLASSES also in Biology, Physiolo
Building and Machine Construction, Steam,

Mechanics, Land and Quantity Surveying, and
THE SIR JOHN CASS TECHNICAL

Calendar 6d. (post free 8d.), on application to
INSTITUTE,

CITY OF BIRMINGHA
JEWRY STREET, ALDGATE, E.C.

DEPARTMENT
Evening Classes in Chemistry, Metallurgy, Physics
and Mathematics designed to meet the requirements of those

CHEMIST WANTED. engaged in Chemical, Metallurgical and Electrical The Gas Committee of the City of Birmingham require Industries and in trades associated therewith.

thoroughly trained CHEMIST, qualibed to take charge

per diem coal testing plant fitted with regenerative resort Special Courses during the Lent Term :

cants must be capable of undertaking the following duties GAS ANALYSIS ... CHARLES A, Kohn, M.Sc., Ph.D., F.I.C. of coal and the by-products of coal, the analysis of furnac

the METALLOGRAPHY C. O. BANNISTER, Assoc. R.S.M.

regulating of the gas plant, the manufacture of gas, includi

analysis and test for illuminating power and of calorific v Full curriculum for B.Sc. Examination of London

of all materials used in manufacture, and also the initiation

stat University in Experimental Science under recognised of experiment and research work to aid the scientific developed at the Teachers of the University.

industry. NEW TERM began MONDAY, JANUARY 9, 1905.

Applicants are required to furnish particulars of their scholastic attain

ments in chemistry, state their age and experience, and salary required. The Institute is readily accessible and near to Fenchurch Street, Liver- and forward their application, addressed to the CHAIRMAN of the Works pool Street, Broad Street and Metropolitan Railway Stations,

Sub-Committee of the Gas Department, Council House, Birmingham, on For details of the Classes apply at the Office of the Institute, or by or before February 20 next. letter to the PRINCIPAL.

G. HAMPTON BARBER, Secretary. Council House, Birmingham,

January, 1905.
NATURAL SCIENCE SCHOLARSHIP.

CITY AND GUILDS
KEBLE COLLEGE, OXFORD.

CENTRAL TECHNICAL COLLEGE, A SCHOLARSHIP of the annual value of £60, together with Laboratory

EXHIBITION ROAD. Fees, not exceeding 620 per annum, will be awarded at this College in CIVIL AND MECHANICAL ENGINEERING DEPARTMENT March, 1905. The Examination commences Tuesday, March 14.

An ASSISTANT is required who can teach Mechanical Drawing and Subjects : Chemistry or Biology, with Elementary Mechanics and Physics

Mechanism ; applicants should bave had some experience in the Dravog for all Candidates, and Elementary Chemistry for those who offer Biology.

Office of a Mechanical Engineering Firm. Apply, sending testimonials For full particulars apply to Dr. HATCHETT JACKSON, Keble College,

with a statement of age and particulars of teaching experience, to Prof. Oxford.

W. E. Daley. Salary, £150 per annum.

MATHEMATICAL DEPARTMENT. THE LISTER INSTITUTE OF

An ASSISTANT is required immediately who possesses a sound kuow. PREVENTIVE MEDICINE.

ledge of Elementary Mathematics and of the Elements of the Differential

and Integral Calculus. Some experience in a Mechanical or a Physical JENNER MEMORIAL STUDENTSHIP IN BACTERIOLOGY.

Laboratory and some knowledge of Geometrical Drawing is desirable, but The Governing Body offers Research Studentship of the value of £150,

not necessary, Salary, 6100 per annum. Apply, sending testimonials and tenable by a British subject for one year, but renewable for a second year

a statement of age, to Prof. O. HENRICI. at the option of the Governing Body:

Applications to be sent in by March 18, 1905, to the AssisTANT COUNTY BOROUGH OF HUDDERS-
SECRETARY.
The Listei Institute of Preventive Medicine,

FIELD.
Chelsea Gardens, Chelsea Bridge Road, London, S.W.

TECHNICAL COLLEGE. RHODES UNIVERSITY COLLEGE,

Principal–J. F. HUDSON, M.A., B.Sc. GRAHAMSTOWN, CAPE OF GOOD

ASSISTANT LECTURER and DEMONSTRATOR in CHEMIE

TRY required. Some teaching experience necessary. Salary. {1x8
HOPE,

Statement of duties on application to
ESTABLISHED BY ACT OF PARLIAMENT, 1904.

THOS. THORP, Secretary. Applications are invited for the following Professorships, viz. :

TO SCIENCE AND MATHEMATICAL (1) LATIN and CLASSICAL LITERATURE and PHILOLOGY. MASTERS.-Easter (1905) Vacancies. --Graduates and other rell Salary, £500 per annum.

qualified Masters seeking posts in Public and other Schools for best (2) PHILOSOPHY and HISTORY, Salary, £500 per anrfum.

term should apply at once, giving full details as to qualifications, des (3) APPLIED MATHEMATICS and PHYSICS. Salary, £500 per 10 Messrs. GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents

(Estd. 1833), 34 Bedford Street, Strand, London. Immediale notice (4) GEOLOGY. Salary, 4350 per annum.

of all the best vacancies will be sent. (5) ZOOLOGY. Salary, £350 per annum.

The professors of Geology and Zoology will also hold appointmenrs in connection with the Albany Museum, for which they will receive an

MARLBOROUGH GRAMMAR SCHOOL, additional salary of £150 each per annum.

APPLICATIONS are invited for the position of HEAD MASTER Further particulars may be obrained from the AGENT-GENERAL FOR this school. Commencing salary, £250. Candidates must not be more the THE CAPE of Good Hopr, 100 Victoria Street, Westminster, London, to 35 years of age, and must be Graduates of some Universiry in the Caiced whom applications, with copies of testimonials, should be sent on or belore Kingdom. March 15, 1905.

Full particulars, together with a form of application, will be supplied by Applicants must be under 40 years of age, and must furnish a certificate the undersigned. Application must be made before April 1. Work coce of good health.

mences in September. Successful candidates will be required to enter upon their duties at

H. G. CANE, Acting Clerk to the Governen. Grahamstown on July 25, 1905.

7 High Street, Marlborough.

annum

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The Advertiser would be glad to purchase

in Parts, a few weeks after dates of issue, (1) “The Philosophical Magazine"; (2) "Science Abstracts." Also within six months of publication, bound or unbound volumes of " The Philosophical Transactions of the Royal Society." Please apply, stating prices asked, to

“S," NATURE Office. Mechanic wanted for University Laboratory.

- Required a first-class all-round worker in wood and melal, with previous experience of laboratory work. State age, qualifications, training, and wages required.-"No. 1842," NATURE Office.

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