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Dr. J. S. HALDANE'S PORTABLE APPARATUS

FOR ANALYSIS OF MINE GASES.
(See The Investigation of Mine Air," by Sir C. Le Neve Foster and

Dr. Haldane, 1905, p. 116.)
The Apparatus is arranged in a portable Mahogany Cabinet, with a rod to

screw into the base, so that it
may be stood against the sides
of a gallery in the mine, and
the analysis made on the spot.

TOWNSON ÉNERCER

THE

WOODHOUSE INCLINED PLANE. .

Price 25/

The external

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

Mercury, pure, for same, 2-1b. in
bottle

0 8 6
13 X 74 x 34
inches, and ihe

Caustic Potash Solution, 1.pint in
bottle

0 weight when

10 charged ready

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

by Sir C. Le Neve Foster and five pounds. Dr. Haldane, 1905

0 Sole Makers : C. E. MÜLLER, ORME & CO., Ltd.,

148 HIGH HOLBORN, LONDON, W.C.

34 CAMOMILE STREET, E.C.

A REALLY FIRST-CLASS

X-RAY TUBE,

equal in workmanship and results to Tubes double the price.

16/6 ISENTHAL & CO., 85 MORTIMER STREET, LONDON, W.,

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

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Printed by RICHARD CLAY AND SONS, LIMITED, at ; & 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, to Fifth Avenue, New York. - THURSDAY, July 13, 1,3

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" To

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

solid ground
Of Nature trusts the mind which builds for aye."-WORDSWORTH.
No. 1864, Vol. 72]
THURSDAY, JULY 20, 1905

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

(All Rights are Reserved.

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PRACTICAL NOTES ON
TELEPHOTOGRAPHY,

Free on application to
R. & J. BECK, Ltd., 68 CORNHILL, LONDON.

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Further Particulars and Prices of this and other long range Barometers sent on application

to the ManufacturersNEGRETTI & ZAMBRA,

38 HOLBORN VIADUCT, E.C. Branches: 45 CORNHILL, and 122 REGENT

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MINISTRY of PUBLIC INSTRUCTION, BIRKBECK COLLEGE

EGYPT.
POLYTECHNIC SCHOOL OF ENGINEERING. BREAMS BUILDINGS, CHANCERY LANE, E.C.
An INSTRUCTOR in ENGINEERING is required to begin work on

FACULTY OF SCIENCE.
September 30 in the Polytechnic School of Engineering, Ghizeh (near
Cairo).

DAY AND EVENING COURSES.
The Instructor appointed will be engaged in teaching Descriptive
Engineering and Hydraulics.

Chemistry

SJ. E. MACKENZIE, Ph.D., D.Sc. Candidates must have had practical experience as engineers, and have

(H. WREN, Ph.D., B.A., B.Sc. been engaged on work of a class intimately related to the subjects to be

ALBERT GRIPPITHS, D.Sc. taught. They should be from 25 to 35 years of age, unmarried, and have a Physics ...

D. OWEN, B.A., B.Sc. robust constitution.

(B. W. CLACK, B.Sc. A University Degree or Diploma in Engineering is an essential qualifi- Mathematics

E. H. SMART, M.A. cation.

{: Salary about £430 per annum (£ Eg35 per mensem), rising to about Botany

(A. B. RENDLE, M.A., D.Sc. 6553 per annum (4 Eg. 45 per mensem). Allowance for passage out to

(F. E. FRITSCH, Ph.D., B.Sc. Egypt. Bachelor quarters are provided.

Zoology ..

H. W. UNTHANK, B.A., B.Sc. Applications, with full statement of qualifications, and accompanied by

Geology & Mineralogy Geo. F. HARRIS, F.G.S. copies only of testimonials, must be sent in before July 22, 1905, addressed Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M. to W. C. MACKENZIE, Esq., D.Sc., 5 The Crescent, Cromer, to whom candidates may apply for further information.

RESEARCH in Chemistry and Physics in well-equipped laboratories.

French, German, Spanish, Russian, Dutch, & Itallan Classes. MINISTRY OF PUBLIC INSTRUCTION, EVENING CLASSES also in Biology, Physiology, Practical Geometry, EGYPT.

Building and Machine Construction, Steam, Tbeoretical and Applied

Mechanics, Land and Quantity Surveying, and Estimating.
SCHOOL OF AGRICULTURE.

Calendar 6d. (post free 8d.), on application to the SECRETARY.
An INSTRUCTOR in LAND SURVEYING and FARM
ENGINEERING is required to begin work on September 30 in the
School of Agriculture, Ghizeh (near Cairo).

At the SOUTH-WESTERN POLYTECHNIC, Preference will be given to candidates having experience of Practice and Manresa Road, Chelsea, S.W., Day College Courses of thirty hoars Teaching. They should be from 23 to 33 years of age, unmarried, and bave per week will be conducted in preparation for the London University a robust constitution.

Degrees of B.Sc. in Mechanical and Electrical Engineering, in ChemisA University Degree or College Diploma is an essential qualification.

try, Physics and the Natural Sciences. The composition fee for the Salary about £295 per annum (6 Eg. 24 per mensem), rising to about Session of three terms, 1905-1906, is £15. These Courses are recog. 5393 per annum (L Eg. 32 per mensem). Allowance for passage out to

nised for “ Internal Students of the University, and consist of Egypt. Bachelor quarters are provided.

lecture and laboratory instruction. The Courses are conducted by : Applications, with full statement of qualifications, and accompanied by

MECHANICAL ENGINEERING, W. W. F. Pullen, A. Macklow copies only of testimonials, must be sent in before July 22, 1905, addressed

Smith; ELECTRICAL ENGINEERING, A. J. Makower; to W. C. MacKENZIE, Esq., D.Sc., 5 The Crescent, Cromer, to whom

CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe; candidates may apply for further information.

MATHEMATICS and PHYSICS,

S. Skinner, W. H. Eccles, J. Lister and L. Lownds; BOTANY, H. B. Lacey and T. G. Hill;

GEOLOGY, A. J. Maslen. In the evenings similar Courses will be COUNTY COUNCIL OF THE

conducted, but at £2 per Session. Also TECHNICAL DAY

COURSES of three years' duration are arranged as a preparation for WEST RIDING OF YORKSHIRE. the Engineering, Electrical and Chemical and Metallurgical pro EDUCATION DEPARTMENT.

fessions. The Laboratories

and Workshop are open for RESEARCH

under the direction of The Principal and the Heads of Departments, SECONDARY SCHOOLS.

Further particulars may be obtained on application to The The West Riding Education Committee will require in September the SECRETARY, who will send the Calendar and Prospectus for 3d., ar services of : ONE ASSISTANT MASTER to teach principally Mathematics.

it may be obtained at the Office, price id. Salary, £150 per annum.

TWO ASSISTANT MISTRESSES to teach principally Science. Salary, £120 each per annum.

ST. MARY'S HOSPITAL MEDICAL ONE ASSISTANT MISTRESS to teach principally Mathematics and

SCHOOL,
Physical Exercises. Salary, 6120 per annum.
ONE ASSISTANT MISTRESS with special qualifications for pre-

PADDINGTON, W. paratory work. Salary, 6120 per annum.

The WINTER SESSION will begin on OCTOBER 2. ONE ASSISTANT MISTRESS to teach principally English and The Medical School provides complete

courses for the Medical Degrees Physical Exercises. Salary, £100 per annum.

of the Universities of London, Oxford, Cambridge and Durham;

for the Applications for these posts must be made on forms to be obtained from

Diplomas of M.R.C.S., L.R.C.P.; and for the Naval and Military the Education Department (Secondary), County Hall, Wakefield, where Medical Services. they must be returned not later than Saturday, July 29, 1905. Copies of PRELIMINARY SCIENTIFIC (M.B.LOND.). --A complete course not more than three recent testimonials must be sent with the application.

of Chemistry, Physics and Biology, under recognised Teachers of the Canvassing will be a disqualification.

University, will begin on October 3.

SIX ENTRANCE SCHOLARSHIPS in Natural Science, value 145 COUNTY COUNCIL OF THE to £52 10s., will be competed for in September.

Calendar and full particulars on application to the DEAN.
WEST RIDING OF YORKSHIRE.
EDUCATION DEPARTMENT.

THE GROCERS' COMPANY'S
HIGHER EDUCATION.

SCHOLARSHIPS. The West Riding Education Committee will require in September the With the object of encouraging original research in Sanitary Science, the services of TWO MASTERS (one qualified in Science and Mathematics, Grocers' Company offer TWU SCHOLARSHIPS, each of 6300 a year, and one in English and General Subjects) for the purpose of conducting with an allowance to meet the cost of apparatus and other expenses in Courses of Instruction for Groups of Elementary Teachers and undertaking connection with the work, tenable for one year, but renewable for a second some teaching in Secondary Schools, at £200 each per annum.

or third year, subject to the conditions of the scheme under which they Applications for these posts must be made on forms to be obtained from

are established. the Education Department (Secondary), County Hall, Wakefield, where The next Election will take place in May, 1906. They must be returned not later than Saturday, July 29, 1905. Copies of Applications must be sent in before April 1 to the CLERK OF THE pot more than three recent testimonials must be sent with the application.

GROCERS' COMPANY, Grocers' Hall, Londoo, E.C., from whom a form of Canvassing will be a disqualification.

application and further information may be obtained. BIOLOGY-Wanted, an Assistant to help

B.A. AND B.Sc. EXAMS. generally in Biological Laboratory on four afternoons and four evenings per week; must be qualified to take Elementary Board of Education

MATRICULATION, INTERMEDIATE, FINAL. Class in Physiology. 'Salary, Eso, and free admission to other classes in College. - Apply to PRINCIPAL, BIRKRECK COLLEGE, Breams

PREPARATION by CORRESPONDENCE and ORAL TUITION Buildings, E.C.

on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based on

The STAFF includes Graduates of Oxford, Cambridge, London, and BIRKBECK COLLEGE.

Royal Universities, Science Medallists, Prizemen, Scholars, &c. The Council invite applications for the appointment of ASSISTANT

SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, LECTURER in MATHEMATICS. Cominencing salary, 4175, to date

Psychology, Political Economy, Latin, Greek, French, German, &c. from September 15 next.

For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oron, Applications, stating age, degrees and qualifications, teaching experi. Burlington Correspondence College, Clapham Common, London, S. W. ence, and enclosing testimonials, must reach the PRINCIPAL not later ihan August 30. Birkbeck College, Breams Buildings, Chancery Lane, E.C.

For other Scholastic Advertisements, see pages cxiii an. cxiv.

success.

TRADE
MARK

Metol-Quinol
Developer hele

papers and

INDIAN FOREST SERVICE. THE SECRETARY of State for INDIA IN COUNCIL gives notice that, in view of the late date at which the Regulations for the Appointment of Probationers to the Indian Forest Service were published this year, he bas decided to modify them(a) by extending till Tuesday, August 1, the period within which appli

cations will be received ; (7) by admitting to the examination candidates who undertake to pass

Brand Responsions or its equivalent before October next, failing which

their selection would be cancelled ; (c) by permitting candidates to offer Zoology at their discretion.

Applications for admission to the examination must be made on a printed form to be obtained (with the revised Regulations) from the SECRETARY, Judicial and Public Department, India Office, Whitehall, London, S.W.

The age limits are 18 10 21 years on January 1, 1905.
Not less than 13 candidates will be selected, if fully qualified.
India Office,

A. GODLEY,
July 5, 1905.

Under Secretary of State.
BOROUGH POLYTECHNIC

Equally good for plates, films,
INSTITUTE.

bromide

papers, gas - light ENGINEERING DEPARTMENT.

lantern slides. The Governors of this Institute will be prepared to receive applications from persons qualified to reach the following subjects in Evening Classes :-MECHANICAL ENGINEERING (City and Guilds of London Insti.

Economical, compact

and tate course).

STEAM and HEAT ENGINES with Laboratory work.
JUNIOR ASSISTANT in ENGINEERING LABORATORY and in

portable. Keeps perfectly.
DRAWING OFFICES.
INSTRUCTOR for ELECTRIC WIRING and FITTING.

Per carlon to make 44 ounces, 1/For further particulars apply to

C. T. MILLIS, Principal. Borough Polytechnic Institute,

Sold by all dealers and chemisis 103 Borough Road, London, S.E.

WRITE FOR BOOKLET GRATIS THE GLASGOW AND WEST OF

BURROUGHS WELLCOME AND CO.
SCOTLAND TECHNICAL COLLEGE.

LONDON, SYDNEY AND CAPE TOWN
The Governors invite applications for a post about to be created in the
Administrative Department of the College. The principal dury of the COMMENT)

PHO. 105 officer appointer will be to secure the co-ordination of ibe work of the Continuation Classes in Mathematics, Engineering Drawing and Building Construction, conducted by the School Boards of Glasgow and Govan, with the College Evening Classes in the same subjects. His work in this con. nection will be under the supervision of a Joint Committee representing the School Boards and the College; in regard to his other duties, he will be under the direction of the Governors of the College, and must place bis whole time at their disposal. Candidates must have a sound knowledge of

WANTED for WOLMER'S SCHOOL, two of the subjects named, as well as experience in teaching them. Salary KINGSTON, JAMAICA, by September 12, 1905, an ASSISTANT not less than £300 per annum. Applications must be sent to the MASTER to iake charge of the Science Teaching (Physic, and SFCRETARY, Technical College, Glasgow, on or before July 29.

Chemistry) throughout the School, and to teach ordinary class : ubjects

in addition. Salary, £150 (One Hundred and Fifty Puunds) por COUNTY BOROUGH OF BURY.

annum, non-resident. Passage money to Jamaica (418) will be pad,

but must be refunded by the Master appointed if he resigns within MUNICIPAL TECHNICAL SCHOOL.

twelve months ; 612 10 be refunded on resignation in the second year;

46 on resignation in the third year. Medical certificate of health WANTED, to begin duties on September 1, 1905, well qualified

required. Apply, stating scientific qualifications, subsidiary subjects, TEACHER of THEORETICAL and 'PRACTICAL PHYSICS, who &c., and enclosing testimonials, to w. CowPER, M.A., Headmaster, will be required to give instruction to Pupil Teachers during the daytime Wolmer's School, Kingston, Jamaica. Applications made in response for about twelve hours a week, and (for about thirty weeks in the year) to

to this advertisement (those already made need not be repeated) should students of the Evening Classes on five evenings a week.

be posted not later than Thursday, July 27. Salary, 150 per annum.

Applications, stating age, qualifications, and teaching experience, should reach the undersigned not later than July 27, 1905.

MASTERSHIPS VACANT FOR SEP. ROBERT WILKINSON,

TEMBER. - Physics, College in India, 6320, and passage ;

Director of Education. Mathematical, Public College, England, 1200; Several Science Education Offices, Bank Street, Bury,

Graduates, Public College, London University Teaching (entre, 6150 July 14, 1905.

to 6300; Ditto, Mathematical, 6150 to $300; #nglish, must be in

Honors, 6150 to £175; English and French, 6150 to 6175; 200 COUNTY OF LONDON.

Vacancies for Senior, Junior, and Foreign. JUNIOR. ASSISTANT NATURALIST, HORNIMAN MUSEUM.

ORELLANA

CO. Applications are invited for the post of JUNIOR ASSISTANT to the

Send List to all Candidates, Naturalist at the Horniman Museum, Forest Hill, S.E. Preference will be given to applicants who have made a practical study of some branch of

80 WIGMORE STREET, LONDON, W. Natural History, and have a general knowledge of Zoology. Importance will be attached to good handwriting, and an acquaintance with photographic methods is desirable. Commencing wages, iss. a week. Appli- MUNICIPAL TECHNICAL SCHOOLS, cations in the candidate's own handwriting, with copies of not more iban tbree testimonials, must be sent to the undersigned not later than 10 a.m.

LIMERICK. on July 28, 1905.

G. L. GOMME,

A PRINCIPAL is required for the above Schools who would also County Hall, Spring Gardens,

Clerk of the Council.

undertake to teach Electricity in the evenings.

Salary, 1200 to 6250, according to qualifications and experience of July 20, 1905.

organising work.

Application to be sent before July 31 to THE SECRETARY, 69 George To SCIENCE and MATHL. MASTERS.- Street, Limerick.

REQUIRED (1) Master qualified to teach Theoretical and Practical Science, &c. Commencing salary, 6150, non-res. Secondary School near London. (2) Assistant Master for General Elementary Science.

KENT EDUCATION COMMITTEE. Degree not necessary, 22 hours' work a week. Technical Institute in Keot. 6140 to 4160, non-ses. (3) Two Masters required for

TECHNICAL INSTITUTE, TUNBRIDGE WELLS. Physics and Chemistry under Dept. of Agriculture and Technical Applications are invited for the post of ASSISTANT in the SCIENCE Instruction, Eroo each, resident. Grammar School. For particulars DEPARTMENT. Salary, 4150. Apply to H. W. Cook, Principal. of the above and many other vacancies, address :-GRIFFITHS, SMITH, POWELL & SNITÁ, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand.

For other Scholastic Advertisements, see tages cxii and cxiv.

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HANDSWORTH EDUCATION

COMMITTEE.

TECHNICAL SCHOOL. WANTED for September next, an ASSISTANT SCIENCE MASTER for the Technical School. The person appointed to devote the whole of bis time to the duties connected with the appointment. Chief subjects, Physics and Mathematics. Classes every evening and part day.

Salary: £140 per annum.
For form of application and further particulars please send stamped
addressed foolscap envelope to

THOMAS H. MOON, Secretary.
Education Offices,
Handsworth (Staffs.),
July 18, 1905.

GUY'S HOSPITAL.
PRELIMINARY SCIENTIFIC (M.B. London).
The next Course of LECTURES and PRACTICAL CLASSES for this
Examination will begin on October 2. Full particulars may be obtained on
application to the Dean, Guy's Hospital, London Bridge, S.E.

LABORATORY, MUSEUM,

STOREROOM, &C.,

you can save ths of your wall space and find what you want on the instant.

BRIDLINGTON HIGH SCHOOL
FOR GIRLS.

IN THE SYTAM SYSTEM
WANTED in September, ASSISTANT MISTRESS for SCIENCE

One hundred 4 oz. bottles occupy less than and MATHEMATICS. Degree or equivalent. Apply Head MISTRESS.

one square foot of wall space; each bottle is A large Manufacturing Company is open to instantly located, removed or replaced, and any

engage in a confidential position a young Englishman who possesses size from { oz. to a Winchester can be accommothorough knowledge of Chemistry, Inorganic and Organic, and who understands the elements of Mechanical Engineering. A knowledge

dated in the same sized Element. of French and German desirable. State age and family connections, and where education has been acquired. Reply to "MANUFACTURER,' c/o STREET's, 30 Cornbill, London, E.C.

WRITE FOR THE BROWN LIST Wanted, Manager for High-class Scientific

TO THE Apparatus Business. Applicant must have had good experience and a thorough scientific training. --- Apply, stating age, salary required, and

full particulars, 10 ALPHA," c/o NATUR& Office. Technical Chemist, well up in general | 18 & 19 BASINGHALL BUILDINGS, chemistry and analysis of carbohydrates and brewing materials, accus

LEEDS. tomed to supervision of students, aged 27, requires post, moderate salary.-Address 1864, NATURE.

Accurate and First-class A.R.C.Sc.(Geology), Asst. Demon

Inexpensive. strator R.C.Sc., requires vacation work (to end of September). -- Apply

TyRRELL, 59 Liverpool Road, Watford.
For other Scholastic Advertisements, see pages cxii and cxiii.

PRICE

SYTAM FITTINGS CO.,

[graphic]

F. G. CUTTELL, Preparer of ROCKS,

MINERALS, &c., for Microscopic Examination.-19 Abbotstone
Road, Putney, S.W.

21/

page 232
Jan. 5, 1995,
16 See "NATURE,"

PHOTOMICROGRAPHY for Publishers,

Lecturers, Manufacturers, and general scientific research. Good work, moderate charges.-Saxby, 91 Penny Lane, Seston Park, Liverpool.

THE NEW PATENT

PIESMIC BAROMETER.

TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN.
TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher
Local, thorough acquaintance with Modern Languages). Research,
Revision, Translation. Scale of charges on application. The Cam.
bridge Type-writing Agency, 1o Duke Street, Adelphi, W.C.

Descriptive

To be obtained of all Opticians, or Pamphlet

the SOLE MAKERS, Post Free.

F. DARTON & CO.,

CLERKENWELL OPTICAL WORKS, 142 ST. JOHN STREET, LONDON, E.C.

SCIENTIFIC WORTHIES. GLASS BLOWING.

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.

NOTICE.
Proof Copies of the Photogravure Portrait of
PROF. SUESS which appeared in "Nature" of
May 4 can be obtained from the Publishers at
5s. each.

All kinds of Scientific and Experimental
Glass Blowing carried out on the Premises.

Any form of Glass Apparatus repaired.
Demonstrations given here, or at Colleges, &c.

H. HELM, 66 HATTON GARDEN, LONDON, E.C. Actual Maker of all kinds of X-Ray and Vacuum Tubes,

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