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REYNOLDS & BRANSON, Ltd.,

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE.

To the solid ground

Of Vature trusts the mind which builds for aye."—WORDSWORTH.
No. 2071, VOL. 81]
THURSDAY, JULY 8, 1909

(PRICE SIXPENCE Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.
Newton's New Demonstrator's
"Transpaque" Lantern

Manufacturers of Chemical and
Has all the advantages
of our well-known

Physical Apparatus.
** Demonstrator's
Lanterns, and in

THE “RYSTOS” ELECTROSCOPE.
addition will show
brilliantly on the

This Electroscope, with paraffin screen, opaque objects or book

insulator, remains charged for at least illustrations, if not larger than a

a day, and has been used with the large postcard.

greatest satisfaction in many secondary
schools for the last ten years. A
customer states that the batch of two
dozen, obtained two years previously,
have remained in efficient condition

during that time.
a) Price with attachment for two Wires and top re-

movable for cleaning the glasses ...
(6) Ditto, with two glass tubes for showing the leak-
age caused by a radio-active gas ...

5/6 each. (c) Ditto, with transparent scale, lecturer's pattern,

for projection of image of gold leaf and scale 7/6 each.

by means of a lantern ... NEWTON & CO., 3 FLEET STREET, LONDON.

14 COMMERCIAL STREET, LEEDS.

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Negretti & Zambra's

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THE UNIVERSITY OF LIVERPOOL. NORTHERN POLYTECHNIC INSTITUTE,
SESSION 1909-10 COMMENCES ON TUESDAY, OCTOBER 5.

HOLLOWAY, LONDON, N.
FACULTY OF ENGINEERING.

Close to Holloway Stn. (G.N.R.), Highbury Stn. (N.L.R.),
Dean-J. WEMYSS ANDERSON, M. Inst.C.E.

Holloway Rd. Stn. (B. & P. Tube), & Highbury Stn. (G.N.Tube). Professors and Lecturers.

LONDON UNIVERSITY SCIENCE AND ENGINEERING
Harrison Professor-W. H. WATKINSON,

DEGREES.
M.Eng., M. Inst.C.E., M.I.Mech. E.,
ENGINEERING
M.I.E.E.

Day and Evening Courses in the above under recognised teachers in-
Lecturer in Strength of Materials-W.
MASON, M.Sc., Assoc. M.Inst.C. E.

MATHEMATICS, BOTANY,
ELECTRICAL
David Jardine Professor-E. W. MAR.

PHYSIOS,

GEOLOGY,
ENGINEERING
CHANT, D.Sc., M.I.E.E.

CHEMISTRY,

ENGINEERING. CIVIL ENGINEERING { Proteiner.c. E. Professor S. W. PERROTT, M.A.I., Separate Laboratories for Elementary, Advanced and Honours students,

exceptionally large and well equipped. NAVAL ARCHITECTURE Vacant.

RESEARCH.
ENGINEERING DESIGN Lecturer - J. WEMYSS ANDERSON,
AND DRAWING

{
M.Eng., M. Inst.C.E., M.I.Mech. E.

Special arrangements for students undertaking research during vacations.

Full particulars at the lastitute or sent on receipt of postcard.
MATHEMATICS
Professor F. S. CAREY, M.A.

REG. S. CLAY, D.Sc., Principal. PHYSICS

{ Lyone Jones Professor-L. R. Wileer.
M.A.

NEIL SESSION COMMENCES SEPTEMBER 27.
CHEMISTRY ...
Grant Professor-J. CAMPBELL BROWN

EAST LONDON COLLEGE.
D.Sc., LL.D.
RAILWAY
( Associate Professor-J. A. F. ASPINALL

(UNIVERSITY OF LONDON.)
ENGINEERING
M.Eng., M. Inst.C.E., M.I. Mech. E.

MILE END ROAD, E. MUNICIPAL

Associate Professor-J. A. {

BRODIE, ENGINEERING

The College is situated close to stations on the G.E.R., District Railway M.Eng., M.Inst.C.E., M.I.Mech. E.

and L.T. and Southend Railway, and is approached from The Royal

Professor A. MUNICIPAL ELECTRI.

BROMLEY

Exchange in 15 minutes by motor omnibus.
CAL ENGINEERING...

M.Eng.,
M.Inst.C.E.,

PASS AND HONOURS COURSES in the
- M.I.E.E.

FACULTIES OF ARTS, SCIENCE AND ENGINEERING. The Courses of Study in the Faculty leading to the ordinary degree of

Latin, Greek, English, French, German, English History, Bachelor of Engineering extend over at least three years. They are so

Logic, Mathematics, Physics, Chemistry, Botany, Geology. arranged as to afford a general scientific training for those who intend, with

CIVIL AND MECHANICAL ENGINEERING, or without graduating, to become engineers or naval architects, or to enter

ELECTRICAL ENGINEERING. any allied profession.

Courses in the above subjects are likewise arranged for Evening Students who do not proceed to a University degree may take a course

Students. of not less than two years leading to a Certificate in Engineering.

PREPARATORY AND MATRICULATION CLASSES. The Honours Course enables students to specialise in some branch of the

MODERATE FEES. profession, and opportunities are afforded for post.graduate work and Valuable Scholarships are offered annually by the Worshipful Company research.

of Drapers. The special Prospectus of the Faculty may be obtained on application to Calendar post free on application to the REGISTRAR, or the undersigned.

J. L. S. HATTON, M.A., Principal. P. HEBBLETHWAITE, M.A., Registrar.

SOUTH-WESTERN POLYTECHNIC INSTITUTE,

MANRESA ROAD, CHELSEA, S.W.
Day Courses in preparation for London University degrees in Mechanical
and Electrical Engineering, in Chemistry, Physics and Natural Science.
Session Fee, £15. Similar Evening Courses. Session Fee, 62.

Technical Day Courses arranged to extend over 3 years and prepare for
Engineering, Electrical, Chemical and Metallurgical professions.
Mathematics *W. H. Eccles, D.Sc. ; *J. LISTER, A.R.C.S.
Physics

*S. SKINNER, M.A. ; *L. LOWNDS, B.Sc., Ph.D., DIRECTOR :

and F. W. JORDAN, B.Sc.

Chemistry ... Professor Sir JAMES DEWAR, M.A., LL.D., D.Sc., F.R.S.

*J. B. COLEMAN, A.R.C.S. ; * J. C. CROCKER, M.A.

D.Sc. ; *F. H. Lowe, M.Sc., & W.E. OAKDEN. SUPERINTENDENT OF THE LABORATORY:

Botany

*H. B. LACEY ; S. E. CHANDLER, D.Sc., and

*H. J. JEFFERY, A.R.C.S. DR. ALEXANDER SCOTT, M.A., D.Sc., F.R.S.

Geology

*A. J. MASLEN, F.L.S. This Laboratory was founded by Dr. Ludwig Mond, F.R.S.,

Zoology

*H. B. FANTHAM, D.Sc., A.R.C.S., F.Z.S. as a Memorial of Davy and Faraday, for the purpose of pro

Engineering

*W. W. F. Puller, Wh.Sc. ; *A. MACKLOW

SMITH and H. AUGHTIE. moting, by original research, the development and extension of Electrical

*A. J. MAKOWER, M.A. ; *B. H. MORPHY and Chemical and Physical Science.

Engineering U. A. OSCHWALD, B.A. Michaelmas Term.-Monday, October 4, to Saturday, December 11.

* Recognised Teacher of the University of London.

Full prospectus from the SECRETARY, post free, 4d.; at the Office, Lent Term.-Monday, January 3, to Saturday, March 19.

price id.

SIDNEY SKINNER, M.A., Principal. Easter Term.-Monday, April 11, to Saturday, July 23. Full Information and Forms of Application can be had from the

BATTERSEA POLYTECHNIC. Assistant SECRETARY, Royal Institution, Albemarle Street, W.

PRINCIPAL-S. G. RAWSON, D.Sc. To prevent delay Candidates ought to send in their applications for

Full Day and Evening Courses, extending over three or more years, for admission during the course of the Term preceding that in which they wish

University and Technical Students, are held in the following subjects :

*Mathematics to enter.

(F. M. SAXELBY, M.Sc., B.A. ; F. W.

HARVEY, B.Sc., M.A. *Physics

W. THOMSON, M.A., COUNTY COUNCIL OF THE WEST

B.Sc.; J. W.

BISPHAM, M.A., B.Sc.
RIDING

Metal

*Chemistry and OF YORKSHIRE.

lurgy

}} J. Wilson, M.Sc.; J. L. White, D.Sc. EDUCATION DEPARTMENT.

W. E. M. CURNOCK, M.Sc., B.Eng;;

*Mechanical Engineering J. B. SHAW, A.R.C.S., Wh. Ex. ; R, W, ELLAND SECONDARY SCHOOL (GIRLS).

BAILEY, Wh.Sc.

* Electrical Engineering... A. W. ASHTON, M.Sc.; A. T. Dover. The West Riding Education Committee will require for the above school

"Botany

Miss L. J. CLARKE, B.Sc., F.L.S. for September next, the services of an ASSISTANT MISTRESS to take

Geology

A. WADE, B.Sc., A.R.CS. chiefly Science, Mathematics and Physical Geography (ability to teach

Sanitary Chemistry J. H. JOHNSTON, M.Sc., F.I.C. Domestic Subjects will be an additional qualitication). Commencing *Students attending in these subjects may register as internal students of salary, £120 per annum.

London University.. Forms of application may be obtained from the Education Department

Classes are provided in Latin, French, German, Spanish, Italian ; in Com(Secondary Branch), County Hall, Wakefield, and should be returned, with

mercial Subjects and Commercial Law; in Sanitary Science, Bacteriological copies of not more than three recent testimonials, not later than July 19

Chemistry, &c. There are completely equipped Departments in Domestic next.

Economy, Art and Crafts, and Music. Scholarships to the value of 6310 Canvassing will be a disqualification.

are awarded annually: Special facilities are afforded for research work.

For prospectus and further particulars apply to the SECRETARY.

THE DAVY-FARADAY RESEARCH LABORATORY

ROYAL INSTITUTION.

OF THE

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BIRKBECK COLLEGE,

THE JOURNAL OF ECONOMIC BIOLOGY.

DR. CUYANE-VAUCHAN, M.A. ; E. M. CUTTING, WALTER E. COLLINGE, M.Sc., F.L.S., F.E.S.,

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BREAMS BUILDINGS, CHANCERY LANE, E.C.

DAY AND EVENING CLASSES.
Courses of Study under Recognised Teachers of the University of
London for Degrees in Science, Arts and Economics.

A. MCKENZIE, Ph.D., D.Sc., M.A.; H. WREN,
Chemistry
Ph.D., M.A., B.Sc.; G. W. CLOUGH, B.Sc.

Edited by
A. GRIFFITHS, D.Sc.; D. OWEN, B.A., B.Sc.;
Physics

B. W. CLACK, B.Sc.
Botany...

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

with the co-operation of
Qoology
J. W. EVANS, D.Sc.; A. M. DAVIES, D.Sc.

Prof. A. H. REGINALD BULLER, D.Sc., Ph.D.; Mathomatico... E. H. Smart, M.A.; C. V. COATES, M.A. Classics F. A. WRIGHT, M.A.; G. S. ROBERTSON, M.A.

Prof. GEO. H. CARPENTER, B.Sc., M.R.I.A.; Eng. Literature J. H. LOBBAN, M.A.

Prof. PERCY GROOM, M.A. (Cantab. & Oxon.), D.Sc., F.L.S.; Language J. S. WESTLAKE, M.A.

ROBERT NEWSTEAD, M.Sc., A.L.S.;
French
V. E. KASTNER, B.ès. L.; J. S. WESTLAKE, M.A.

and A. E. SHIPLEY, M.A., Hon. D.Sc., F.R.S. Qorman

E. L. MILNER-BARRY, M.A.
Qoography L. W. LYDE, M.A.
History
T. SECCOMBE, M.A.

Vol. IV., Parts 1 and 2, now ready.
Logic

SG. ARMITAGE-SMITH, M.A., D.Lit. Economics {G: C. KANKIN, M.A.

CONTENTS :British Constitution. G. H. J. HURST, M.A.

Descriptions and Life-histories of Two New Parasites of the Black Assaying. Motallurgy. Mining. G. PATCHIN, A.R.S.M.

Currant-Mite. (With Plts. i. and ii. and 5 Text-figs.) By ADELAIDE M. Prospectus free, Calendar 3d. (post free 5d.), from the Secretary.

TAYLOR.- Descriptions of Two New Species of Collembola. (With
Plt. iii.) By WALTER E. COLLINGE, M.Sc., F.L.S., and JOHN W.

SHOEBOTHAM, N.D.A.- Observations on the Life-history and Habits of
BIRKBECK COLLEGE.

Thereva nobilitata, Fabr., and other species. (With Plt. iv.) By

Walter E. COLLINGE, M.Sc., F.L.S.-Note re Rat Parasites. By HEAD OF BOTANY DEPARTMENT.

A. E. SHIPLEY, M.A., F.R.S.-A Contribution to our Knowledge of the This post is vacant owing to the appointment of Mr. Gwynne Vaughan

British Thysanoptera, with Notes on Injurious Species. By RICHARD S. as Professor at Belfast University. The Council invite applications.

BAGNALL, F.E.S.-A Stem Boring Becile attacking Cotton in the Sudan. Commencing salary, £300. Candidates should apply as soon as possible,

(With Plt. v.) By HAROLD H. King.- Description of a New Genus of

Collembola of the Family Neelidae, Folsom. (With Plt. vi.) By stating age, academic distinctions, experience and criginal work, and should enclose testimonials to the PRINCIPAL, Birkbeck College, Bream's

WALTER E. COLLINGE, M.Sc., F.L.S., and John W. SHOEBOTHAM.

Reviews.-Current Literature.
Buildings, London, E.C.
The Agent-General for Victoria, Australia,

Prepaid Annual Subscription to Vol. IV. (4 parts), 16s. is authorised to receive at his offices at Melbourne Place, Strand, London, W.C., applications for appointment to the Chair of Engineer: | A few complete sets of Vols. I.-III. are still obtainable, ing at the Melbourne University, which is now vacant. Salary, Ercoo

price 218. each, per annum.

LONDON : DULAU & CO., 37 Sono SQUARE, W.

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THE CLINICAL SCHOOL,

BROWNING'S UNIVERSITY OF LIVERPOOL. TOURIST & DEER-STALKING

& TELESCOPES

of the finest quality in BRASS or ALUMINIUM,

with Caps and Slings.

Clinical teaching in the University is carried on in four General Hospitals and five Special Hospitals.

The Hospitals contain a total of 1050 beds ; 80ɔ of these are in the General Hospitals, 250 in the Special Hospitals.

Twenty-six Resident Appointments, fourteen carrying salaries from £60 to £100 per annum, are open to students of the School.

Further information may be obtained on application to the Secretary, Professor ABRAM, 74 Rodney St., Liverpool.

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GUY'S HOSPITAL. ENTRANCE SCHOLARSHIPS, to be competed for in September, 1909.

TWO OPEN SCHOLARSHIPS in ARTS, one of the value of £100, open to Candidates under 20 years of age, and one of £50, open to Candidates under 25 years of age.

TWO OPEN SCHOLARSHIPS in SCIENCE, one of the value of 6150, and another of £60, open to Candidates under 25 years of age.

ONE OPEN SCHOLARSHIP for University Students who have completed their Study of Anatomy and Physiology, of the value of £50.

Full particulars may be obtained on application to the Dean, Guy's Hospital, London Bridge, S.E.

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UNIVERSITY OF MANCHESTER

do.

AND

Price List of Field and Opera Glasses, Telescopes, &c., free on application.

MANCHESTER ROYAL INFIRMARY.

ENTRANCE MEDICAL SCHOLARSHIPS. Two Scholarships are offered and will be awarded to candidates who give evidence of a high standard of proficiency in Arts or Science respec. tively. Each Scholarship is of the value of £100, and the successful candidates will be required to enter for the full Medical Curriculum in the University and the Infirmary. Applications should be sent on or before July 15 to the REGISTRAR, from whom further particulars may be obtained.

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...

ENGINEERING AND CHEMISTRY.

PORTSMOUTH EDUCATION
CITY AND GUILDS OF LONDON

COMMITTEE.
INSTITUTE.

(HIGHER EDUCATION.)
SESSION 1909-1910.
The COURSES of INSTRUCTION at the Institute's Central Technical

GIRLS' SECONDARY SCHOOL. College (Exbibition Road) are for Students not under 16 years of age ;

APPLICATIONS ARE INVITED FOR THE POST OF SENIOR those at the Institute's Technical College, Finsbury, for Students not under

SCIENCE MISTRESS. 14 years of age. The ENTRANCE EXAMINATIONS to both Colleges are held in September, and the Sessions commence in October. Particulars Graduate, with good experience, to teach Physics, Chemistry, Botany to of the Entrance Examinations, Scholarships, Fees, and Courses of Study, London Matriculation and Senior Oxford Standard. Ability to take a may be obtained from the respective Colleges, or from the Head Office of little Geography on modern lines a recommendation, but not an essential. the Institute, Gresham College, Basingball Street, E.C.

Salary, £135, increasing after approved service to £150 by £5 annual

increments. OITY AND GUILDS CENTRAL TBOANIOAL OOLLEGE. (EXHIBITION ROAD, S.W.)

Particulars should be given in the following order, viz., Name, Address, A College for Higher Technical Instruction for Day Students not under

Age, Training, Qualifications, Previous Experience, Present Appointment. 16 preparing to become Civil, Mechanical, or Electrical Engineers,

Applications, on paper of foolscap size, accompanied by copies only of Chemical and other Manufacturers, and Teachers. The College is a

three recent testimonials, should be received not later than the 12th inst., "School of the University of London," and also forms the Engineering

addressed to the SECRETARY, at the Municipal College, Portsmouth. Section of the Imperial College of Science and Technology. Fee for a full Associateship Course, 636 per Session.

SCIENCE MASTERS required in Sep-
Professors :
nical Engineering { "M.inse.coe.

W. E.
DALBY,

M.A., B.Sc.,
Civil and Mech

tember, (a) for first.grade Public School, good degree and experience

essential. Salary from 6160; if able to highest Mathematics Electrical Engineering T. MATHER, Wh.Scb., F.R.S. (Act.

not less than £200, increasing. D 19289. (6) Graduate with experience ing Professor).

to teach Science, with Mathematics or French, in Public Secondary Chemistry (H. E. ARMSTRONG, Ph.D., LL.D.,

School. £160 or £170, non. res., increasing. No. D 20360. (C) For F.R.S.

Endowed School, to teach Chemistry and Botany, 6160, non. res. Mechanics and Mathematics O. HENRICI, Ph.D., LL.D., F.R.S.

D 20260. (d) Experienced Science Graduate to teach Botany, Che

mistry and Physics, and Mathematics. Dual School. 6140, non. res., OITY AND GOILDS TROBNICAL COLLBGB, FINSBURY.

and extras. No. D 20242. (e) To teach Mathematics and Science (LEONARD STREET, City ROAD, E.C.)

in Proprietary School; goud Degree and experience essential. A College for Intermediate Instruction for Day Students not under 14,

Salary up to £150, res.

D 20063. preparing to enter Engineering and Chemical Industries, and for Evening MATHEMATICAL MASTERS required Students. Fees, 620 per Session for Day Students. Professors :

in September, (a) for Public Secondary School ; Mathematical Honour Physics and Electrical Engincering Principal of the College. S. P. THOMPSON, D.Sc., F.R.S., Degree and experience necessary. Non-res., 6160. D 19320. (6) For

High-class Preparatory School ; res., up to £130. D 19850. (c) For Mechanical Engineering and ( E.

G.

COKER, M.A., D.Sc., Public School, Oxford or Cambridge Mathematical Honour Degree Mathematics M.Inst.M.E.

and experience. Res.. £130 to $150. D 19957. (d) Oxford or CamChemistry R. MELDOLA, F.R.S., F.I.C.

bridge Mathematical Honour man for Public Secondary School. Res., JOHN WATNEY, Hon. Secretary.

up to £140, increasing. D 19879. City and Guilds of London Institute,

For further details of these and other vacancies apply, with particulars Gresham College, Basinghall Street, E.C.

of qualifications, to Messrs. TRUMAN & KNIGHTLEY, Ltd., Educational

Agents, Sheffield House, 158-162 Oxford Street, London, W.
AËRIAL NAVIGATION.-Mr. Eric Stuart
BRUCE, M.A. Oxon., F.R. Met. Scc., Member of Council and late

THE UNIVERSITY OF SHEFFIELD.
Honorary Secretary Aëronautical Society of Great Britair., Vice-
President Aërial League of the British Empire, Membre d'Honneur

APPOINTMENT OF ASSISTANT LECTURER AND Aéro Club of France, can accept engagements for his eniinently suc.

DEMONSTRATOR IN BOTANY. cessful lecture, “AIRSHIPS, BALLOONS, AND FLYING MACHINES," profusely illustrated by elaborate experiments and working models, The Council are about to appoint an ASSISTANT LECTURER and also for shorter demonstrations at Soirées, Exhibitions, &c. Now DEMONSTRATOR in BOTANY. booking for Winter Season. For prospectus, terms, &c., address E. S. BRUCE, Esq., Airth, Sunningdale, Ascot.

Applications should be made to the undersigned, from whom further particulars may be obtained.

W. M. GIBBONS, Registrar. HARTLEY UNIVERSITY COLLEGE, SOUTHAMPTON.

THE UNIVERSITY OF SHEFFIELD. Principal-S. W. RICHARDSON, D.Sc. (Lond.), M.A. (Camb.).

APPOINTMENT OF ASSISTANT LECTURER A VACATION COURSE IN NATURE-STUDY, conducted by

IN MATHEMATICS. Professor CAVERS, D.Sc. (Lond.), with facilities for work in Advanced

The Council are about to appoint an ASSISTANT LECTURER in Practical Botany, will be held in the College from August 2 to 14, 1909. MATHEMATICS. Salary, £200 per annum. For particulars apply to

D. KIDDLE, Registrar.

Applications must be sent in by July 17 to the undersigned, from whom further particulars may be obtained.

W. M. GIBBONS, Registrar.
PRIFYSGOL CYMRU.
UNIVERSITY OF WALES.

Wanted, a Director of Education for the Gold TWO PRICE DAVIES SCHOLARSHIPS to the University of

Coast Colony. Salary, £600 a year, with a duty allowance of £120 a Wales, each of the value of £30 per annum, and tenable for ibree years at

year, payable while the Director is on duty in the Colony. Free either the University College of Wales, Aberystwyth, or the University

passage provided, also free quarters partially furnished. Leave of College of North Wales, Bangor, will be awarded in September, 1909. absence and pension in accordance with the ordinary regulations of the Particulars may be obtained from the REGISTRAR, The University

Colony. Good general education and experience of educational work Registry, Cathays Park, Cardiff.

required. Candidate must not be more than 40.--Applications should

be sent in covers marked "C. A." to THE SECRETARY, Board of COUNTY BOROUGH of SUNDERLAND. Education, Whitehall, S.W. THE TECHNICAL COLLEGE.

BATTERSEA POLYTECHNIC,
Principal-V. A. MUNDELLA, M.A., B.Sc., M. I. E. E.
Applications are invited for the vacant position of ASSISTANT LEC.

LONDON, S.W.
TURER and DEMONSTRATOR in the CHEMISTRY DEPART.
MENT, salary beginning at £120 per annum. Applications must be

The Governing Body require the services of the following for Evening

Classes returned by July 13 to the undersigned, from whom further details of the appointment may be obtained.

TEACHER of GEOLOGY and TEACHER of PHYSIOLOGY.
T. W. BRYERS,

For particulars send addressed envelope to the SECRETARY.
Secretary to the Education Committee.
MORLEY COLLEGE

WEST RIDING COUNTY COUNCIL. (For Working Men and Women),

MEXBOROUGH SECONDARY SCHOOL.
WATERLOO ROAD, S.E.

Wanted, in consequence of promotion to a Headmastership, a SENIOR
PHYSIOLOGY AND PHYSICS.

SCIENCÉ MASTER. Chief subjects: Chemistry, Physics, and Botany

Large and well-equipped new school. Minimum commencing salary, 4150. TEACHERS ar: wanted for Evening Classes in Elementary Physiology rising according to scale. Apply, before July 22, on forms to be obtained. and Hygiene, and in Sound, Light and Heat. Apply Vice-PRINCIPAL. from HEADMASTER.

Greece.—Required, a Master to teach the
English language and all

branches concerning the study of
Navigation. Salary, 414 a month, non-res. Good school. Address
-GRIFFITHS, SMITH, Powell AND SMITH, Tutorial Agents (Estd.

1833), 34 Bedford St., Strand.
To Science Masters.—Required in Septem-

TYPEWRITERS
ber, (1) Graduate to teach Botany, Chemistry, and Physics from an
agricultural point of view, and Mathematics. Salary, 6130 to £140,

BOUGHT, SOLD,
non-resident. (2) Graduate for Chemistry and Physics. Salary, £130,

REPAIRED or
non-resident. Grammar School. Address-GRIFFITHS, SMITH,
POWELL AND SMITH, Tutorial Agents (Estd. 1833), 34 Bedford St.,

EXCHANGED.
Strand.

Hire, 10s. montbly.
WANTED: RADIUM.—Armbrecht, Nelson & Co., 71

Operators sent out with

machines, 5s. per day. and 73 Duke Street, Grosvenor Square, London, W.

MSS. Copied
MOSQUITOES, GNATS and FLIES will

TAYLOR'S LTD Z
not attack if a little of Ambrecht's Pyrethrum is put on the skin. It
protects for about 12 hours, and also cures stings of any insects-wasps

74 CHANCERY LANE, LONDON.-
and bees included. Price 28. od. post free U.K.; Germany, Holland
and English Colonies 15.,

France and Italy is. 6d., extra.- Armbrecht,
Nelson & Co., 71 and 73 Duke Street, Grosvenor Square, London, W.
TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN.
TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher ALL KINDS OF SCIENTIFIC AND EXPERIMENTAL GLASS BLOWING
Local). Modern Languages. Research, Revision, Translation, Short- carried out quickly and correctly from rough sketch at Moderate Charges.
hand. Dictation Room. The Cambridge Type-writing Agency,

ANY FORM OF GLASS APPARATUS REPAIRED.
10 Duke Street, Adelphi, W.C

DEMONSTRATIONS given here, or at Colleges, &c.
OPTICAL GLASS.

H. HELM, 66 HATTON GARDEN, LONDON.
ACTUAL MAKER of ALL KINDS of X Ray, Geissler and other Vacuum

Tubes, Mercury Pumps, High Frequency Electrodes, &c. List free. (Successors

&, ,
Optical Glass for Spectacles. Lenses for Condensers,
Cast Glass. Extra-White and Extra-Plane Plate Glass.

Glass for Microscopic Preparations, &c.
g We supply the most important firms in the whole

Scientific Instrument Makers,
world which use these products.
Telephone : 404-30.
Telegraphic Address : "Scory, Paris." |

GRANTA WORKS, CAMBRIDGE,

ENGLAND.
The
"'

PHONIC
Scrap, &c., valued or purchased.

WHEEL

(Rayleigh

Synchronous Motor)
30 CORNHILL, E.C., & 17 & 18 PICCADILLY, LONDON, W.
ESTD. 1772.

Price £5 0 0
Gems for experimental work at moderate prices.

Works with
Certainty.

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