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SOLER. A. KERSHAW, Dorrington St., Leeds.

CONTRACTOR TO H.M.'s GOVERNMENT.

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Pitchblende, from 2/- to 30/- per piece ; in Powder, 2/6 per oz.
Kunzite, selected, 2/- per_gramme. Carnotite, 2/- per 02.

Aeschynit, 2/- per oz. Emanium, 30/- per decigramme.
Sparteite (see NATURE, March 31, 1904, page 523), 2/- per piece.
Chlorophane, 2/- per piece. Samarskite, 2/- per oz.
Zinc Sulphide, green and yellow, 5/- per tube.
Rad. Residue, 21- per tube. Polonium, 21/- per gram ; 11/- 5-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).
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NEW ZEALAND VEGETABLE CATERPILLAR; from 2 to 3 inches long, with a stem showing fructification growing out of its head. Specimens may be had from 10/6 to 21/-, according to quality and size.

Der See NATURE, May 12, 1904, page 44.
Goods may be returned if not approved of, when money will be refunded.
Professional Men, Universities, Schools, &c., allowed special terms.

AWARDED GOLD MEDAL, ST. LOUIS EXHIBITION, 1904. ILLUSTRATED PRICE LIST OF SPECTROSCOPES, &c.,

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Current-curve (C) and P.D. Curve (V) of a rotary converter, showing ripples due to armature teeth.

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THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, LTD.,

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4406

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye.”—WORDSWORTH.

INDEX NUMBER:

[PRICE ONE SHILLING.

No. 1832, Vol. 71) A THURSDAY, DECEMBER 8, 1904.
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

NEW LANTERN SLIDES.

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

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

SEASON 1904-1905. DETAILED LIST ON APPLICATIO.V. Russo-Japanese_War.

Tissot's New Series of Old Trans-Siberian Railway,

Testament Pictures, Up-to-Date Pictures of Cur- Tennyson's Heroines. rent Events.

Caldecott's Nursery Tales.
The Balkans and the Eastern “Black Beauty.
Question

British Birds and Beasts.
The Bayeux Tapestry:

Natural History. Life of Christopher Columbus. Trees and Plants. Austria and the Tyrol.

Rock Formation. A Snapshot Ramble among Radium Atoms and Spectra. the Alps.

Photographs of Sand Figures Scenes in Many Lands.

on Chaldni's Plate. St. Ives, Cornwall.

The Embryology of a Chicken.
London and London Life. How the Coin of the Realm
Among the London Poor.

is made.
Pilgrim's Progress (R.T.S.). The Fall of a Water Drop.
Life & Times of Martin Luther. Radiographs showing Bone
Scripture -Old Testament.

Diseases.
Seripture-New Testament. The Starry Heavens.

ST. LOUIS EXHIBITION AWARD.
3 GOLD Medals; 1 Silver Medal; 1 Bronze Medal.
Tiro Gold Medals hare been awarded to Messrs. Neuton & Co.

for Lanterns and slides, NEWTON & CO., Opticians to H.M. The King and H.R.H. The Prince of Wales.

3 FLEET ST., LONDON.

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

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Catalogue of Chemical and Physical Apparatus, 350 op. and 1200

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UNIVERSITY OF WALES.

MATRICULATION EXAMINATION, 1905. The University Court will shortly appoint MATRICULATION EXAMINERS as follows: Subjects.

PRESENT EXAMINERS.

Professor A S. NAPIER, M.A., Litt.D. English Language and the His. Ph.D. tory of England and Wales Thc Rev. T. A. WALKER, Litt.D.

LL.D., M.A. Mathematics

{"G. B. MATHEWS, M.A., F.R.S.

* J. H. GRACE. M.A. Latin ...

1 É. Sevmer THOMPSON, M.A.

FRANK RITCHIF, M.A. Greek

*W, E. JORDAN, M.A. Welsh

The Rev. ROBERT WILLIAMS, M.A. French

Professor E. WEEKLEY, M.A. German

*T. BAILEY SAUNDERS. M.A. Dynamics

W.C. D. WHETHAM, M.A., F.R.S. Experimental Mechanics Heat

W. C. D. WHETHAM, M.A., F.R.S. Chemistry

(*F. D. CHATTAWAY, M.A., D Sc

Ph.D. Botany

Professor M. C. Poi Ter, M.A. The Examiners who e names are marked with an * have served for th full period of five years.

Particulars will be given by the REGISTRAR of the University, University Registry, Catbays Park, Cardiff, 10 whom applications must be sent on o before January 7, 1905.

IVOR JAMES, November, 1904.

Registrar of the University.

BIRKBECK COLLEGE. BREAMS BUILDINGS, CHANCERY LANE, F.C. FACULTY OF SCIENCE.

DAY AND EVENING COURSES. Chemistry

1. E. MACKENZIE, Ph.D., D.Sc. 1 H. WREN, Ph.D., BA, 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. Geology & 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, Tbeoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating.

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

and!

...

CITY OF LONDON COLLEGE.

WHITE ST., MOORFIELDS, E.C.

(Near Moorgate and Liverpool Street Stations.) PRINCIPAL: SIDNEY HUMPHRIES, B.A., LL.B. (Cantab.)

EVENING CLASSES in ALL BRANCHES of SCIENCE.

Well-equipped LABORATORIES for Practical Work in CHEMISTRY, BIOLOGY, BOTANY, GEOLOGY, and all branches of PHYSICS.

Special Courses for London University Matric., Inter., and Final B.A., B.Sc., Conjoint Board, Pharmaceutical and other examinations, Classes are also held in all Commercial Subjects, in Languages, Literature and Art. All Classes are open to both sexes.

SATURDAY COURSES for Matric., Inter., and Final B.A., B.Sc.
DAY COMMERCIAL SCHOOL,
Prospectuses, and all other information, gratis on application.

DAVID SAVAGE, Secretary.

On

success,

EAST LONDON TECHNICAL

COLLEGE,
MILE END ROAD, E.

TEACHING STAFF.
Mathematics

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

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

IJ. T. Hewitt, D.Sc., and

C. SMITH, D.Sc. Mechanical Engineering

D. A. Low, M.I.M.E.
Electrical Engineering

J. T. MORRIS, A.M.I.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.

Valuable SCHOLARSHIPS are awarded by the Drapers' Company 11 connection with the Day Classes. CALENDAR with full particulars post free, 4fd.

J. L. S. HATTON, Director of Studies. CREWKERNE SCHOOL, SOMERSET. The Governing Body invite applications for the HEAD MASTERSHIP of the above mentioned Public Secondary School for Boys. The school will, by the scheme under which it will be regulated, be conducted as a Public Secondary School working in accordance with the regulations of the Board of Education with a view to receiving Grants from the Board of Education and the Somerset County Council. Salary, 6200 per annum, together with an annual Capitation fee of £2 per pupil (which are guaranteed for three years) and residence.

Permission to receive Boarders at a charge of 625 exclusive of Tuition Fees (46) and 6 for books, games, drill, and swimming bath.

Accommodation for 120 pupils, including 45 boarders.

Applicants must be University Graduates and registered on Col. B. of the Teachers' Register, or hold equivalent qualifications.

Experience in a large school essential.
The appointment to date from the close of the Easter Holidays, 1905.

Applications, with copies of not less than three recent testimonials, should be sent not later than December 13 to the undersigned, from whom further information can be obtained.

JOHN SPARKS, Solicitor, Crewkerne, November 26, 1904.

Clerk to the Governors. ROYAL COLLEGE OF SCIENCE AND ROYAL SCHOOL OF MINES,

SOUTH KENSINGTON, S.W. The ANNUAL CONVERSAZIONE will be held on the evening of Wedne day, December 21, at 7 p.m., in the College.

The Lecture will be delivered by Dr. W. WATSON, F.R.S., on Radium AND TWENTIETH CENTURY ALCHEMY.

The Programme also includes a Concert and exhibits in the several divisions.

Tickets (Single. 25. 61. ; Double, 45.) may be had from the Secretary, Mr. G. W. C. Kaye. Substantial English Company desires

extend its business by acquiring the British and Colonial rights of a new Chemical Product which is likely to be used on a very large scale for Industrial purposes. Advertisers have exceptional facilities for expluiting an invention of this kind. Offers, with full particulars, to be sent 1 Box 101, T. B. Bruwne's Advertising Offices, 163 Queen Victoria S.reet, E.C.

B.A. AND

B.Sc. EXAMS. MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE and ORAL TUITION on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based

The STAFF includes Graduates of Oxford, Cambridge, London, and Royal Universities, Science Medallists, Prizemen, Scholars, &c.

SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, Psychology, Political Economy. Latin, Greek, French, German, &c.

For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond, and Oxon.), Burlington Correspondence College, Clapham Common, S.W. KING EDWARD'S SCHOOL,

BIRMINGHAM. There will be a vacancy in January for an ASSISTANT SCIENCE MASTER in the Boys' High School. A Biologist (Butany and Zoology) is desired. who is also familiar with gen Laboratory practice an ab'e to teach Physics and Chemistry up to at any rate Matriculation standard. A Cambridge First Classman will receive some preference Commencing salary (non-resident) from 6160 10 6207, according to experience and qualifications. Applications, accompanied by copies of te timonials, storuld be sent in not later than December 31 to R. CARY GILSON, E:4, King Edward's School, Birmingham.

TO SCIENCE AND MATHEMATICAL

MASTERS.--Required (1) Graduate for Practical Physics and Mathe. matics. £180, non-res. (2) Science Master for Advanced Botany, &c. County Schoul in London. $140. (3) Mathematics, Science and Form work. County School in London. £130. (4) Graduate for Mathcs., Physics and Chemistry. £105, resident. Secondary School, Sea side. For particulars of ihe above and many other vacancies, address GRIFFITHS, Smith, Powell & SMITH, Scholastic Agents (Estd. 1833), 34 Bedford Street, Strand, London.

SCIENCE AND MATHEMATICAL

MASTERSHIPS VACANT. Science Public College, 6200; North England. Chemistry and Physics, 6175. Mathematics and Chemistry, Ireland, 6150. Chemistry, 6120. Mathematical, 1180. A list of Masierships, England, Continent, and Over Sea, sent to all Candidates.- ORELLANA & Co., Est. over 40 years, 80 Wigmore Street, Cavendish Square, London, W. (late 44 Old Bond Street, W.).

For other Scholastic Advertisements, see page lvi.

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A

ON SALE. Second-band Astronomical Telescopes, #" for £21, 3}" for £12,

" for £9, 3" for £3 10s., all complete, stand and eyepieces. - Prismatic Binocular Field Glass (best make) for £5, magnification 9, sold elsewhere {6 105.- Microscopes : POWELL & LEALAND complete with mechanical and safety stage, Polariscope and following objectives, all by P. and L., 2",

", "", 1" 7'8", offered £14, cost over four times this amount. Swift's Best Presentation Binocular, mechanical stage, graduated rotary stage, with Swift's complete substage and condensers, 5 eyepieces and 3 objectives, offered £12, cost £42.-Cotton Spinners' Microscope offered for 15s. Many others from £2 10s. upwards.-- Magnificent Chemical Balance, cost £18, offered for £6 10s.-Entomological Cabinet, having 54 drawers, in two tiers, corked and glazed, £6 15s. Several Smaller Cabinets.- Microscope Slides on approval at 4s. per doz., or my selection 50 for 12s.

Rev. H. MILLS, Greenside, Kendal.

SANGER - SHEPHERD COLOUR OUTFIT

makes an acceptable CHRISTMAS GIFT.

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To ensure prompt delivery Orders

should be booked at once.

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Complete Outfits to attach to Plate Cameras, including Repeating-Back as above, and every requisite,

from £7 10 0 Send for New Booklets, post free to readers of "Nature,"

or call and see results ohtained by amateurs.

SECOND-HAND TELESCOPES. 4. in. ALVAN CLARK, with Slow Motions, £50 ; 34 in. STEWARD, with Slow Motions, cost 460, £25; 9£ in. CALVER, Equatorial with Clock,

Universal Mount, Mirror by With. £45.

List, including many others, on application.

SECOND-HAND MICROSCOPES. Watson's Edinburgh H., £16; Swift's Bacteriological, £13 10s.; COLLINS' Binocular, £10; LEITZ' II B, with Mechanical Stage, £8 10s.

List, including many others, on application. A. CLARKSON & CO., 28 BARTLETT'S BUILDINGS, HOLBORN CIRCUS, LONDON, E.C.

SANCER-SHEPHERD & CO.,

5, 6 & 7, Gray's Inn Passage, Red Lion St., Holborn, London, W.C.

SALOP COUNTY COUNCIL.

HIGHER EDUCATION, NOTICE IS HEREBY GIVEN that an EXAMINATION will be held in Shrewsbury early in January, 1905, to elect to an Exhibition for Science Subjects of the value of £50 per annum tenable for not more than three years, by Candidates who hold or have held an open Scholarship or Exhibition at some University or College of University rank approved by the Salop Education Authority. The Exhibition is open to natives of Shropshire, and also to those who received their education within the County for the two years immediately preceding the time at which they joined the Institution in which they hold or have held their qualifying Scholarship: In awarding the Exhibition special regard will be had to the need of qualifying Candidates for further pecuniary assistance. Entries, on forms to be obtained from the SECRETARY, Higher Education, Shirehall, Shrewsbury, must be received by the undersigned not later than December 20, 1904.

W. H. PENDLEBURY, M.A., Shireball, Shrewsbury,

Secretary for Higher Education. November 28, 1904.

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STAFFORDSHIRE COUNTY COUNCIL.

EDUCATION COMMITTEE.

SCIENCE APPLIED TO POTTERY. WANTED, a PHYSICAL SCIENTIST with firstclass University qualifications in Chemistry as Instructor to the County Pottery Classes in North Staffordshire. Salary, 6350 per annum (with prospects of future developments in connection with the proposed North Staffordshire College).

Private practice allowed under conditions.
Any form of canvassing will disqualisy.

Forms of application must be returned not later than December 17, and can be obtained, together with a Schedule of Conditions, from

GRAHAM BALFOUR, M.A. County Education Offices, Stafford,

November 28, 1904.

has always on hand a large and varied stock of

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SCIENCE AND MATHEMATICAL MASTERS. Messrs. NEEDES & SELLICKS,

(Medical and SCHOLASTIC Agency, Estab. 1860), Clock House, Arundel Street, Strand, W.C. Applications are invited for the following appts. :-(1) Public Sch., Nat. Sc. and Drawg., 6150+fees ; valuable post to good man. (2) Chem. and Physics- little English. Gaines preferred. £120, res. (3) Chem. + Magnetism and Electricity. £100, res. (4) Wrangler, Public School. £110, res. (5) County School, Maths. £110, non-re. Many January Appointments.

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 Scientific

Institutions, Polytechnics, &c. DE NATURE says: Teachers requiring efficient apparatus at a low cost for lecture or laboratory purposes, might consult the list witb advantage."

List on application by mentioning NATURE.

W. WILSON

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Maker of SPECTROSCOPES, SPECTROMETERS,

GONIOMETERS, OPTICAL BENCHES, OPTICAL AND OTHER

MEASURING INSTRUMENTS. BEST WORK. MODERATE PRICES.

Price List Free. 1, BELMONT STREET, CHALK FARM, N.W. ខ្ចី FREDK. JACKSON & Co.

(Late MOTTERSHEAD & CO.), 14 CROSS STREET, MANCHESTER

Goods Entrance : 10 Half-Moon Street.
LABORATORY FURNISHERS,
Importers, Manufacturers, and Dealers in
CHEMICAL AND PHYSICAL

APPARATUS
Of every Description.
Fine 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—9238.

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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 ADMIRALTY;

BRITISH AND FOREIGN HOSPITALS, &c.

LISTS ON APPLICATION, 82 HATTON GARDEN, LONDON.

Apparatus for estimation of sulphur in spent oxide.

THE TRAM-CHRONOGRAPH.

BY

F. JERVIS-SMITH, M.A., F.R.S.

2/• Post FREE.

E. MOGRIDGE, 3 ST. GILES, OXFORD.

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