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COLLEGE.

OOO

EAST LONDON TECHNICAL

COLLEGE,
MILE END ROAD, E.

New Term Commences JANUARY 9, 1905.
Mathematics

SJ. L. S. HATTON, M.A., and

W. F. S. CHURCHILL, M.A. Chemistry

J. T. Hewitt, D.Sc., and

1 C. SMITH, D.Sc. Mechanical Engineering...

D. A. Low, M.I.M.E., and J. A.

DAVENPORT, B.Sc., Vict. Electrical Engineering

J. T. MORRIS, A.MI.E.E. Physics

JR. A. LEHFELDT, D.Sc., and

W. H. WHITE, B.A., B.Sc. Botany

V. H. BLACKMAN, M.A. The DAY CLASSES for students over 16 years of age include full three years' technical courses in Chemistry and Engineering, and three years' courses for London University Degrees (Pass and Honours).

EVENING CLASSES are held in Advanced Technical and Scientific subjects, and for London University Degrees.

SCHOLARSHIPS of the value of £40 per annum will be awarded by the
Drapers' Company in June next.
CALENDAR with full particulars post free, 4fd.

J. L. S. HATTON, Director Studies.

BIRKBECK
BREAMS BUILDINGS, CHANCERY LANE, F.C.

FACULTY OF SCIENCE.
DAY AND EVENING COURSES.

J. E. MACKENZIE, Ph.D., D.Sc Chemistry

H. WREN, Ph.D., B.A., B.Sc.

ALBERT GRIFFITHS, D.Sc. Physics ...

D. OWEN, B.A., B.Sc.

B. W. Clack, B.Sc. Mathematics

E. H. SMART, M.A.

(W.G. BIRT, B.A., B.Sc. Botany

(A. B. RENDLE, M.A., D.Sc.

(F. E. FRITSCH, Ph.D., B.Sc. Zoology ...

H. W. UNTHANK, B.A., B.Sc. Goology & Mineralogy Geo. F. HARRIS, F.G.S. Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M

RESEARCH in Chemistry and Physics in well-equipped laboratories. French, German, Spanish, Russian, Dutch, & Italian Classes.

EVENING CLASSES also in Biology, Physiology, Practical Geometry, Building and Machine Construction, Steam, Theoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating.

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

THE SIR JOHN CASS TECHNICAL

INSTITUTE, JEWRY STREET, ALDGATE, E.C. Evening Classes in Chemistry, Metallurgy, Physics and Mathematics designed to meet the requirements of those engaged in Chemical, Metallurgical and Electrical Industries and in trades associated there with.

Special Courses during the Lent Term :-
GAS ANALYSIS

CHARLES A. Kohn, M.Sc., Ph.D., F.I.C. METALLOGRAPHY C. O. BANNISTER, Assoc. R.S.M.

Full curriculum for B.Sc. Examination of London University in Experimental Science under recognised Teachers of the University.

GLASS Blowing. Two Courses of Instruction will be given during the Term by Mr. A. C. Cossor.

NEW TERM begins MONDAY, JANUARY 9, 1905. The Institute is readily accessible and near to Fenchurch Street, Liver. pool Street, Broad Street and Metropolitan Railway Stations.

For details of the Classes apply at the Office of the Institute, or by letter to the PRINCIPAL.

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

HIGHER MATHEMATICS FOR SCIENCE AND OTHER STUDENTS. Correspondence Tuition by highly qualified graduates of

, and Royal Universities, in Algebra, Trigonometry, Theoretical Mechanics, Difles ental and Integral Calculus, Pure Geometry, Geometrical Drawing, &c.

Departments are at work preparing for London and Royal University Examinations, Science and Art. Civil Service Examinations, and all Prof Preliminaries. ---Apply to Mr. J. CHARLESTON, B.A., Burlington Cortepondence College, 8 Crescent Grove, Clapham, S.W.

ESSEX EDUCATION COMMITTEE.

ASSISTANT CHEMISTRY INSTRUCTOR. The Essex Education Committee require immediately the services of an ASSISTANT INSTRUCTOR of CHEMISTRY and PHYSICS at the County Laboratories. The person appointed must have had a sound Mathematical and Scientific Training at a University or institution of University standing, and some teaching experience. Salary, 6150 per annum.

Applications, stating age, qualifications and experience, to be sent, with copies of two recent testimonials, on or before Thursday, January 26, to

J. H. NICHOLAS, Secretary. County Offices, Chelmsford.

January 10, 1905. SCIENCE AND MATHEMATICAL

MASTERSHIPS VACANT. Science Master required for well-known Catholic School, Salary 6150. Ditto for Army Pupils, 6200 Fifty

Science Men required for Grammar, Preparatory and Secondary Schools. List sent to all Candidates. No preliminary charges. ORELLANA & CO.,

Established over 40 years, 80 Wigmore Street, Cavendish Square, London, W.

(lale 44 Old Bond Street).

Books. Second-hand for Sale, cheap.

“Grays' Molluscous Animals.”. 5 Vols., 1857, mostly Plates. "Sachs Text Book of Morphological and Physiulogical Botany." “ Kirby's Butterflies and Moths." 5 Vols., many Coloured Plates Many others. List sent. Low Cash Value, or exchange Architectera' or Technological Works. Address, JENNINGS, 62 Barry Ruad,

Dulwich, S.E. Inter. B.Sc. Hons. (Lond.), Medallist

Machine Design, Tech. Coll. training ; factory experience and super vision of men, desires permanent appointment as ASSISTANT MANAGER or other responsible post. Speciality : Instruments on

precision. Energetic. Low Salary.—1837, c/o NATURE. A Cambridge Man engaged in Research, with

highest attainments in Mathematics, Physics and Chemistry, desires tu act as a SCIENTIFIC ADVISER to manufacturing or other concert

to which his training and experience may be of use.—1837, cio NATTE Aeronautics.-Gentleman experienced in all

kinds of Aeronautical Construction, Aeroplanes, Propellers, Airstaps &c., wishes to join another in Aeronautical experimenting. "God,

Messrs. DEACONS, Leadenhall Street, E.C. For Sale.- Volumes of “ Nature," roughly

bound, from November, 1869. to January, 1995. Apply to Lieut-Cl

C. R. Woods, R.A.M.C., Royal Infirmary, Dublin. TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIENTIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher Local, thorough acquaintance with Modern Languages). Research, Revision, Translation. Scale of charges on application. The Can bridge Type-writing Agency, 10 Duke Street, Aldephi, W C.

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COUNTY SCHOOL, GRAVESEND. Wanted immediately, a SENIOR SCIENCE MASTER to teach Chemistry up to Honours Standard (B.E.) in Secondary Day School and Evening Science Classes. An experienced teacher and good disciplinarian essential. Commencing Salary £150, with some 625-63c for Evening Work. Apply, giving age, qualifications, experience, and copies of three testimonials, by January 30 to HEAD MASTER. 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. For Sale, “ Journal of the Chemical Society,"

10 years from 1894. Complete with indices.-G. S. NEUTH, Godstone, Surrey.

ELECTRO-THERAPEUTICS

Including Radiography, High Frequency, Hydro-Electric and Light Baths, Finsen and other Light, Cautery, Electrolysis, &c.

INDUCTION COILS AND STATIC MACHINES A SPECIALITY. CONTRACTOR TO THE WAR OFFICE, INDIA OFFICE, AND ADMIRALTT.

BRITISH AND FOREIGN HOSPITALS, &c.

LISTS ON APPLICATION. 82 HATTON GARDEN, LONDON.

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ORTHOCHROMATIC PHOTOGRAPHY.

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A SANGER-SHEPHERD Light Filter gives th: Maximum of Orthochromatic effect with the Minimum of Exposure.

To obtain Pictures true to nature with correct values of Light and Shade, Shadow Details and Cloud Effects, use a Sanger-Shepherd Light Filter. All sizes stocked-Circular and Square. Fittings and Cases

of many Patterns to suit all Cameras.

SETS OFLIGHT FILTERS

in Special Case, morocco-covered, velvet-lined, for pocket. X 5 times. For Cloud Effects and Snapshots ...

from 76 X 10 times and Gilvus. For Landscapes and Portraiture ...

... from 10 Absolutus. For correctly copying all coloured objects ... ...

... from 10 Ir Send for New Booklets, post free to readers of " Nature," or call and

see results obtained by Amateurs. SANGER-SHEPHERD & CO.

FACTORY AND OFFICE : 5, 6, 7 GRAY'S INN PASSAGE, RED LION STREET, HOLBORN, W.C.

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FOR SALE, at Reduced Prices.

MICROSCOPIC SLIDES (dispersal of Mr. Hornell's collection), see Micro. Editor's note, June No. of Knowledge, Sections of Flower Buds, &c., also Marine, suitable for Students and Exhibition, new, prices from 3d. each.

MICROSCOPE, Baker's D.P.H. and fittings, 67 16s. ; Beck's London and fittings, £6 6s.; many others, Pillisher, Ross, &c. Several Objectives. Bull's-Eye Condensers. Abbe Condensers. Eyepieces by Leitz, &c. Goer z PRISMATIC BINOCULARS. Photographic Lenses. SURGEON'S OPERATION Outfit, very fine, new, for sale, cheap.

Collection of Shells. Many other useful articles. Send for lists. Mr. HERBERT CLARKE, 104 LEADENHALL STREET, LONDON.

MARBLE REDUCEO TO QUICKLIME IN

10 MINUTES

with our NEW BLAST WARNING.

BUNSEN

BURNER AND

MIDGET FURNACE.
Observe that the
Regulator of

We make these in two sizes ar Burner, Body of

present, " and ", and the prices Furnace, and

are-Burners only, 1/6 and 26; Hood are all dis.

complete with Furnace, 4/6 and tinctly stamped

6/in the metal

The consumption of gas is the " BREWSTER,

same as with an ordinary Bunsen, SMITH & Co.,

but the heat derived is three LONDON."

times as great, and a number of Beware of imita

interesting experiments can be tions that do not

performed with them, wbich contain the essen

have only been possible before tial feature of this

with very expensive furnaces. burner's success.

We are the SOLE MAKERS. NATURE says :-“The combination of furnace and burner is very convenient. These little furnaces are not only useful for reducing calcium carbonate to lime, but also work very well in fusion experiments." BREWSTER, SMITH & CO., 6 CROSS ST., FINSBURY PAVEMENT, LONDON. Makers and Importers of every description of Scientific

Apparatus and Chemicals.
LABORATORIES FITTED & FURNISHED THROUGHOUT.
Our NEW CHEMICAL APPARATUS LIST post free, 1/-

Gratis to Colleges and Laboratories.
SECOND-HAND MICROSCOPES.

(Monocular and Binocular.) By Swift, Watson, Beck, Crouch, Collins, Zeiss, Leitz, &c.

SECOND-HAND TELESCOPES.

(Refractor and Reflector.). VARIOUS Sizes. By Cooke, Grubb, Alvan Clark, Wray, Calver, Browning, Steward, Newton, Watson, Dollond, Negretti, Banks,

Fraunhoffer, &c.

LISTS ON APPLICATION.
Α. CLARKSON & Co.,
28 BARTLETT'S BUILDINGS, HOLBORN CIRCUS, LONDON, E.C.
DRAWING INSTRUMENTS.

Best Make and Finish.
SET SQUARES,

T SQUARES,
DRAWING BOARDS.

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

THE IRISH NATURALIST.
A Monthly Magazine of Irish Zoology, Botany, and

Geology. Price 6d.
Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD

PRAEGER, B.A.
Annual Subscription, 5s. Post Free to any Address.
Dublin : EASON & SON, LTD 40 Lower Sackville Street

(to which Address Subscriptions should be sent). London : SIMPKIN, MARSHALL, HAMILTON, KENT, & CO., Ltd

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READING MICROSCOPES, RESISTANCE COILS, &c. 56 CHARING CROSS ROAD, LONDON, W.C.

1 SPECIAL TERMS TO COLLEGES, SCHOOLS, INSTITUTES, &c. Dj

RADIUM "CLOCKS.") RADIUM.

(BROM. PUR.) FROM STOCK

ON HIRE, in 1, 2}, & 5 m.g.

REASONABLE tubes,

PRICES.

or at

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Having made a special study of these instru-
ments, we are in a position to supply :-

1. FOR THE . ,
LECTURE TABLE

(AS ILLUSTRATED).
2. FOR LANTERN

SLIDE USE . .
Discharging every 40 to 100
seconds according to quantity

of Radium.
PRICES will be quoted by

return post.
Kindly Note.- We cannot send
these clocks by parcel post nor

lend them on hire.

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Pitchblende, from 2/- to 30/- per piece; in Powder, 2/6 per cz.
Kunzite, selected, 2/- per_gramme. Carnotite, 2/- per

Aeschynit, 2/- per oz. Emanium, 30/- per decigramme.
Sparteite (see NATURE, March 31, 1904, page 523), 2/- per piece.
Chlorophane, 2/- per piece. Samarskite, 21- per oz.
Zinc Sulphide, green and yellow, 5/- per tube.
Rad. Residue, 2/- per tube. Polonium, 21/- per gram ; 11/- 1.gram
Polonium on Bi. rod., 25/-, Willemite, 2/- per oz.
Flexible Sandstone, 5/- to 50/-. (See NATURE, June 23, 1904,

page 185.) Radio-active Mud, 1/6 per bottle.
Monazit, 3/- per oz.

Monazit Sand, 1/- per oz.
Diamond chips and powder, 10/- per carat (best quality).
Euklas, Hiddenit, Wagnerit, Phosgenit.
Bar. Plat. Cyan., for Screens, 3/- gramme, 60/- oz. Crystals, 4/-

gramme. Screens, 9d. per square inch.
Radio-active screens, 6d. per square inch. Willemite

screens, 6d. per square inch. Electroscopes (special), 21/Spinthariscopes (special), 21/-, 10/6 and 7/6. Selection of Minerals in boxes, 2/6, 5/6, 10/6 and 21/-. New Zealand Vegetable Caterpillar, with a stem showing fructification growing out of its head, 10/6 to 21/- each.

Dr See NATURE, May 12, 1904. CALCIUM METAL,

1/6 per oz.

All Post Free within U.K.
Goods may be returned if not approved of, when money will be refunded.
Professional Men, Universities, Schools, &c., allowed special terms.

We make a special feature of CHEMICALS and APPARATUS of all kinds.

PRICE LIST FREE.

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MANUFACTURING CHEMIST,

Telephone: 1797, PADDINGTON.
Telegrams: MARTINDALE, CHEMIST, LONDON.

W. MARTINDALE, 10 NEW CAVENDISH ST., LONDON, W.

ARMBRECHT, NELSON & CO.,

71 & 73 DUKE ST., CROSVENOR SQUARE, W. W. G. PYE & CO., “GRANTA” WORKS,

CAMBRIDGE (England),

PHYSICAL

APPARATUS

OF

SUBSTANTIAL

DESIGN

AT

MODERATE

PRICES.

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IMPORTANT.-Note also how close the terminals for the unknown value are together, and that a double

successive key is used instead of two single ones.

FURTHER PARTICULARS UPON APPLICATION. Exceptional value in all kinds of resistance boxes for high-class work, also for educational purposes.

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With interchangeable coils, each contained in a dust-tight case.

FIGURE OF MERIT. 10 MILLIMETRES per MICROVOLT

at a scale distance of

1 metre with 25 ohm suspended coil. Price, without tangent-head

£6 with

(Including 26 ohm coil unless otherwise ordered.) Spare coils (5 ohms or 200 ohms) mounted as shown to right of figure ...

... each 3

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THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, LTD.

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