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IMPORTANT ANNOUNCEMENT. J'Arsonval's Latest (1904) Apparatus,

DISPENSING WITH COILS & INTERRUPTERS. X-RAYS & HIGH-FREQUENCY CURRENTS.

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SIMPLE IN MANIPULATION. This apparatus has been already installed by many of the chief workers in Electro-Therapeutics in France and England.

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where the apparatus may be seen working. WATSON'S MICROSCOPES & OBJECTS. Watson's New “Club" Microscope. An Instrument of full size of | New Slide of Radlum for Microscope. Shows Scintillations most modern design. Especially arranged for the use of Amateurs. brilliantly, and easily managed-quire new

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2 6 The Watson-Conrady Condenser System is of new computation, and

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Scales and Hairs of Insects arranged to represent Sprays. New Aplanatic Magnifiers. New Objectives. Everything Bouquets, and Vases of Flowers, always interesting and for the Microscopist.

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Wiite for Catalogue No. 3 of Micro. Objects, together with newly For all ihe above see WATSON'S 158-page Catalogue of Microscopes, sent published supplementary list of Slides, giving details of recently

added specimens, post free. SPINTHARISCOPE for observing the Scintillations of Radium. The very best. Price 21/SPECIALITIES:- STRUTT'S RADIUM CLOCK. Price according to quantity and quality of Radium included:

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GAS PLANT. GAS ENGINE AND DYNAMO. Electric Current for 100 16-c.p. lamps can be obtained for ONE PENNYWORTH of fuel per hour by using a CROSSLEY GAS ENGINE and Dynamo combined, running on a CROSSLEY SUCTION GAS PLANT.

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Printed by RICHARD CLAY AND SONS, LIMITED, al a bread Suct hill, Queen Victoria Street, in the City o London, and puuuhed by MACMILLAN

AND CO., Limiter, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 66 Fifth Avenue, New York.- THURSDAY, Dec. 8, 1904.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye."-WORDSWORTH.

No. 1833, VOL. 71] THURSDAY, DECEMBER 15, 1904.
Registered as a Newspaper at the General Post Office.)

[PRICE 15 Cents.

(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.

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SEASON 1904-1905.

DETAILED LIST ON APPLICATION. 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
Seripture -Old Testament. Diseases.
Scripture-New Testament. The Starry Heavens.

ST. LOUIS EXHIBITION AWARD.
; GOLD MEDALS; 1 SILVER MEDAL; 1 BRONZE MEDAL.
Tiro Gold Medals have been awarded to Messrs. Newton & Co.

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

3 FLEET ST., LONDON.

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CO.,

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.

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NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N. (Close to Holloway Stn., G.N.R., and Highbury Stn., N.L.R.) LONDON UNIVERSITY SCIENCE AND ENGINEERING

DEGREES.
Day and Evening Courses in the above under recognised teachers in-
MATHEMATICS,

PHYSICS,
CHEMISTRY,

ENGINEERING. Separate Laboratories for Elementary, Advanced and Honours students, exceptionally large and well equipped.

RESEARCH. Accommodation and apparatus provided for research in either Pure or Applied Chemistry and Physics, and Engineering, in rooms specially adapted for this purpose. Full particulars at the Institute or sent on receipt of postcard.

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

ROYAL INSTITUTION OF

GREAT BRITAIN.

ALBEMARLE STREET, PICCADILLY, W. LECTURE ARRANGEMENTS BEFORE EASTER, 1905. A CHRISTMAS COURSE OF LECTURES (adapted to a

Juvenile Auditory).

Lecture Hour, Three o'clock. Henry CUNYNGHAME, Esq., C.B., M.A., M.Inst. E.E., M.R.I. Six Lectures on "Ancient and Modern Methods of Measuring Time " (Experi. mentally Illustrated). On December 27 (Tuesday), Dece 1ber 29, 31, 1904, January 3, 5, 7, 1905.

Tuesdays. Lecture Hour, Five o'clock. Profesor L. C. MIALL, D.Sc., F.R.S., Fullerian Professor of Physiology, R.I. Six Lectures on " Adaptation and History in the Structure and Life of Animals." On Tuesdays, January 17, 24, 31, February 7, 14, 21.

Professor KARL PEARSON, F.R.S. Three Lectures on "Some Recent Biometric Studies.” On Tuesdays, February 28, March 7, 14.

Professor W. E. Dalby, M.A., B.Sc., M.Inst.C.E. Two Lectures on “Engineering Problems." On Tuesdays, March 21, 28.

A, HENRY SAVAGE LANDOR, Esq., M.K.I. Two Lectures on "Exploration in the Philippines." On Tuesdays, April 4, Ir.

Thursdays. Lecture Hour, Five o'clock. CHURTON COLLINS, Esq., M.A. Two Lectures on (1) " The Religion of Shakespeare,” (2) “ The Philosophy and Significance of The Tempesi.'" On Thursdays, January 19, 26.

Professor. W. Schlich, Ph.D., C.I.E., F.R.S. Two Lectures on “Forestry in the British Empire.” On Thursdays, February 2, 9.

J. J. H. TEALL, Esq., M.A., F.R.S., F.G.S. Two Lectures on Recent Work of the Geological Survey." On Thursdays, February 16, 23.

Professor H. H. TURNER, D.Sc., F.R.S. Three Lectures on « Recent Astronomical Progress." On Thursdays, March 2, 9, 16.

Professor R. MELDOLA, F.R.S., M.R.I. Two Lectures on “ Synthetic Chemistry" (Experimental). On Thursdays, April 6, 13.

Sir JOHN STIRLING-MAXWELL, Bart., M.P. Two Lectures on Street Architecture." On !hursdays, March 23, 30.

Saturdays. Lecture Hour, Three o'clock. Professor CHARLES OMAN, M.A., F.S.A. Two Lectures on “Wat Tyler in London." On Saturdays, Jan. 21, 28.

Sir ALEXANDER C. MACKENZIE, Mus. Doc., D.C.L., LL.D. Three Lectures on "The Bohemian School of Music ":(with Musical Illustrations). On Saturdays, Feb. 4, 11, 18.

David George HOGARTH, Esq., M.A. Two Lectures on " Archæ ology." On Saturdays, Feb. 25, March 4.

Professor J. J. THOMSON, LL.D., D.Sc., F.R.S. Three Lectures on “ Electrical Properties of Radioactive Substances." On Saturdays, March 11, 18, 25.

The Right Hon. LORD RAYLEIGH, O.M., M.A., D.C.L., LL.D., Sc.D., F.R.S., M.R.I., Professor of Natural Philosophy, R.I. Three Lectures on "Some Controverted Questions of Optics." On Saturdays, April 1, 8, 15.

Subscription (to Non-Members) to all Courses of Lectures (extending from Christmas to Midsummer). "Two Guineas. Subscription to a single Course of Lectures, One Guinea, or Half-a-Guinea, according to the length of the Course. Tickets issued daily at the Institution, or sent by post on receipt of Cheque or Post Office Order.

Members may purchase not less than Three Single Lecture Tickets, available for any Asternoon Lecture, for Half-a-Guinea.

The Friday EVENING MEETINGS will begin on January 20, at 9 p.m., when Professor Sir James Dewar will give à Discourse on "New Low Temperature Phenomena." Succeeding Discourses will probably be given Ly Dr. EDWARD A. Wilson, Professor CLIFFORD ALLBUTT, Dr. CECIL SMITH, Mr. JOHN W. GORDON, Professor MARSHALL WARD, Chevalier G. MARCONI, Professor J. J. Thomson, Sir Squire BANCROFT, Professor 6. H. BRYAN, Professor JosEPH WRIGHT, Mr. ALFRED Mosely, The Right Hon. Lord RAYLEIGH, and other gentlemen. To these Meetings Members and their Friends only are admitted.

Persons desirous of becoming Members are requested to apply to the Secretary. When proposed they are in mediately admitted to all the Lectures, to the Friday Evening Meetings, and to the Library and Reading-Rooms; and their Families are admitted to the Lectures at a reduced charge. Payment: First Year, Ten Guineas; afterwards, Five Guineas a Year; or a composition of Sixty Guinras.

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UNIVERSITY OF LONDON. NOTICE IS HEREBY GIVEN that on WEDNESDAY, March next, the Senate will proceed to elect Examiners in the following Departments for the year 1905-6.

FOR EXAMINATIONS ABOVE THE MATRICULATION. The Examiners appointed may be called upon to take part in the Es. amination of both Internal and External Students. The remuneration of each Examinership consists of a Retaining Fee for the year, and a rata payment for Papers set, Answers marked, and Meetings attended. Full particulars can be obtained on application to the PRINCIPAL.

THEOLOGY. Two in The Hebrew Text of the Old Testament and the Greci

Text of the New Testament.

ARTS AND SCIENCE. One in Latin.

One in Philosophy. One in Greek.

One in Pedagogy. One in The English Language and One in Mathematics. Literature.

One in Experimental Physics. One in History.

One in Chemistry. One in The French Language and One in Botany. Literature.

One in Zoology. One in the German Language and One in Geology and Physical Gea Literature.

graphy.

Laws.
One in Jurisprudence, Roman Law, ! One in Common Law and Late sei

Principles of Legislation, and Principles of Evidence.
International Law.

One in Constitutional History of One in Equity and Real and Per- England. sonal Property.

MUSIC.
One in Music.

MEDICINE.
One in Medicine.

One in Obstetric Medicine. One in Surgery.

One in Forensic Medicine and One in Anatomy.

Hygiene. One in Physiology.

One in State Medicine.

ECONOMICS. One in The Existing British Constitution (including English Local

Government and the Government of Colonies and Dependencies) Candidates must send in their names to the PRINCIPAL, with any attestation of their qualifications they may think desirable, on or before TUESDAY, JANUARY 24. (It is particularly desired by the Senate that no application of any kind be made to its individual Members.) University of London,

By Order of the Senate,
South Kensington, S.W.,

ARTHUR W. RUCKER,
December, 1904.

Principal.

ROYAL COLLEGE OF SCIENCE AND ROYAL SCHOOL OF MINES,

SOUTH KENSINGTON, S.W. The ANNUAL CONVERSAZIONE will be held on the evening of Wednesday, 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, 4s.) may be had from the Secretary, Mr. G. W. C. KAVE.

THE LONDON SCHOOL OF TROPICAL

MEDICINE. (UNDER THE Auspices of His Majesty's GOVERNMENT.)

CONNAUGHT ROAD, ALBERT DOCK, E. (IN CONNECTION WITH THE HOSPITALS OF THE SEAMEN'S

HOSPITAL SOCIETY.) The next SESSION commences on MONDAY, JANUARY 16, 1905 For Prospectus, Syllabus, and other particulars, apply to the Secretary, P. MICHELLI, Esq., Seamen's Hospital, Greenwich, S.E.

For other Scholastic Advertisements, su tages lxv and lxvi.

EAST LONDON TECHNICAL

UNIVERSITY OF WALES.
COLLEGE,

MATRICULATION EXAMINATION, 1905.
MILE END ROAD, E.

The University Court will shortly appoint MATRICULATION

EXAMINERS as follows:-
TEACHING STAFF.
Mathematics
J. L. S. HATTON, M.A., and

SUBJECTS.

PRESENT EXAMINERS.
W. F. S. CHURCHILL, M.A.

* Professor A S. NAPJER, M.A., Litt.D Chemistry

(J. T. Hewitt, D.Sc., and English Language and the His. Ph.D.
C. SMITH, D.Sc.

tory of England and Wales The Rev. T. A. Walker, Litt.D., Mechanical Engineering D. A. Low, M.I.M.E.

LL.D., M.A.
Electrical Engineering
J. T. Morris, A.M.I.E.E.

Mathematics

{*G. B. MATHEWS, M.A., F.R.S. Physics JR. A. LEHFELDT, D.Sc., and

U. H. GRACE, M.A.
W. H. WHITE, B.A., B.Sc.
Botany

E. SEYMER THOMPSON, M.A.

Latin ...
V. H. BLACKMAN, M.A.

FRANK Ritchie, M.A.
The DAY CLASSES for students over 16 years of age include full three Greek

*W. E. JORDAN, M.A. years' technical courses in Chemistry and Engineering, and three years'

Welsh

The Rev. ROBERT WILLIAMS, M.A. courses for London University Degrees (Pass and Honours),

French

Professor E. WERKLEY, M.A. EVENING CLASSES are held in Advanced Technical and Scientific German

*T. BAILEY SAUNDERS. M.A. subjects, and for London University Degrees.

Dynamics

W. C. D. WHETHAM, M.A., F.R.S. Valuable SCHOLARSHIPS are awarded by the Drapers' Company in Experimental Mechanics and} w. C. D. Whetham, M.A., F.R.S. connection with the Day Classes.

Heat CALENDAR with full particulars post free, 4d.

Chemistry

*F. D. CHATTAWAY, M.A., D.Sc., J. L. S. HATTON, Director of Studies.

Ph.D.
Botany

Professor M. C. POTTE?, M.A.
BOROUGH OF EAST HAM.

The Examiners whose names are marked with an have served for the TECHNICAL COLLEGE AND SECONDARY DAY

full period of five years. SCHOOL.

Particulars will be given by the REGISTRAR of the University, University CHEMICAL, PHYSICAL AND BOTANICAL APPARATUS.

Registry, Cathays Park, Cardiff, to whom applications must be sent on or

before January 7, 1905. The above-named Council invite tenders for the supply of CHEMICAL,

IVOR JAMES, PHYSICAL and BOTANICAL APPARATUS for the new Technical College and Secondary Day School at East Ham.

November, 1904.

Registrar of the University. Particulars, Schedule and Form of Tender may be obtained upon application to Mr. W. H. BARKER, B.Sc., Principal of the College, Town Hall,

(THEORY AND East Ham, on and after Monday next, the 19th iost., upon the deposit of

PRACTICE) the sum of one guinea, which will be returned on receipt of a bona fide ! In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for tender.

MEDICAL EXAMS. Tenders to be delivered addressed to “The Chairman, Works Sub

Especial Course of Instruction in THERAPEUTICS, PHARMA. Committee, Town Hall, East Ham, E.," and endorsed '“Tender for

COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY Chemistry Apparatus, &c.," not later than 12 o'clock noon of Thursday, EXAM. December 29, 1904.

Mr. FREDERICK DAVIS, The Laboratories, The firm whose tender is accepted will be required to pay to the whole of their workmen Trade Union rate of wages and observe Trade Union hours il (Registered in Column B (Advanced Education), Teachers Registration of labour, and to also enter into a contract with a bond for the due and

Councii, Board of Education, S.W.), peyper performance of the contract.

49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. The Council does not bind itself to accept the lowest or any tender.

By order, Town Hall, East Ham, E.,

CITY AND GUILDS CENTRAL C. E. WILSON, Town Clerk. December 13, 1904.

TECHNICAL COLLEGE. THE VICTORIA UNIVERSITY OF WANTED, an ASSISTANT competent to give instruction in the theory,

and practice of the construction, and use of Optical Apparatus. Salary MANCHESTER.

commencing at £100 per annum. The Council desires to proceed to the APPOINTMENT of a PRO.

Apply in the first instance by ! tter, stating age and details of experience, FESSOR of ENGINEERING.

10 Prof. AYRTON, City and Guilds Central Technical College, Exhibition The Professor will be responsible for the organisation of the Engineering

Road, London, S.W.
Department, and will bave the direction of the Engineering Laboratory.
He may take a consulting practice under specified conditions.

WOOLWICH POLYTECHNIC.
His stipend will be composed of a fixed salary and a share of the fees,
and the Council guarantee that the total income will not be less than £1000

Principal WILLIAM GANNON, M.A. per anmum during the first tbree years.

A detaied statement of the conditions of appointment may be obtained The Governors invite applications for the post of LECTURER and from the REGISTRAR.

DEMONSTRATOR in ENGINEERING. Commencing salary, £150 Applications, with references and such testimonials (not exceeding three per annum. Particulars of the post may be obtained from the Principal on is hamber) as the candidate may desire, should be sent on or before receipt of a stamped addressed foolscap, envelope. All applications, to be February 15 to the REGISTRAR.

made on special forms, must be lodged with the Principal before

December 31, 1934.
TO SCIENCE AND MATHEMATICAL

A. J. NAYLOR,
December 14, 1904.

Clerk to the Governors.
MASTERS.-Required (1) Science Master for Advanced Botany, &c.
County School in London. £140. (2) Mathematics, Science and
Form work. County School in London. 6130. (3) Graduate for QUEEN'S COLLEGE, GALWAY.
Mathcs, Physics and Chemistry. 6105, resident. Secondary School,
Sea-side. (6) Graduate for Chemistry and Physics. 6130. County

A LECTURER in ELECTRICAL ENGINEERING is required School. (s) Chemistry, Physics and Mathcs. [120. For particulars

early in January, 1905. Salary, 6125, with Class Fees. Applications, with of the above and many other vacancies, address Griffiths, Smith,

testimonials, should be sent to the REGISTRAR on or before December 31. POWELL & SMITH, Scholastic Agents (Estd. 1833), 34 Bedford Street, Strand, London,

for other Scholastic Advertisements, see pages Ixiv and lxvi.

COLOUR PHOTOGRAPHY. SANGER-SHEPHERD QUICK CHANGE, ONE PLATE, LATEST PATTERN OUTFITS.

EXCELLENT Photographs in Colour are obtained with our smaller lens filter Outfits, complete from 25/- ; but for general work, Landscapes in changing light, Portraiture or Photomicrography where rapid exposures in succession are necessary, the Repeating Back with Colour Filters is recommended as the best all round appliance.

It may be attached to any , or whole-plate camera or glass plate Kodak, by means of a panel cut to correspond and interchangeable with The ordinary dark slide.' This does not in any way interfere with the use of the camera for ordinary work. The three Colour Filters are held in a frame, clipped in front of the double dark slide which carries the two plates, each large enough to record the three negatives side by side, when ihe slide is pushed past the opening in the outer case. With this Outfit, even a beginner will secure three-colour negatives with the ease and certainty of an ordinary photograph.

Repeating Back Attachments, with Filters complete, from 90/1 Send for New Booklets, post free to readers of Nature," or

call and see results ohtained by amateurs. SANGER-SHEPHERD & CO., 5, 6, 7 Gray's Inn Passage, Red Lion Street, Holborn, London.

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X-RAYS:

KING EDWARD'S SCHOOL,

THE GEOGRAPHICAL JOURNAL. BIRMINGHAM.

PRICE 25.

CONTENTS.-DECEMBER.
There will be a vacancy in January for an ASSISTANT SCIENCE
MASTER in the Boys' High School. A Biologist (Botany and Zoology) is

The Antarctic Meeting at the Albert Hall (with Plate of Special Antarctic desired. who is also familiar with general Laboratory practice and able to

Medal). teach Physics and Chemistry up to at any rate Matriculation standard. A England and Wales viewed Geographically. By Hugh Robert Mill, D.Sc. Cambridge First Classman will receive some preference. Commencing

(with Map). salary (non-resident) from £160 to $209, according to experience and

The Fulani Emirates of Northern Nigeria. By Major J. A. Burdout, qualifications. Applications, accompanied by copies of testimonials, should F.R.G.S., Resident of the Sokoto Province (with nine Illustrations). be sent in not later than December 31 to R. Cary Gilson, Esq., King Captain J. Liddell's Journeys in the White Nile Region (with three IliaEdward's School, Birmingham.

trations and Sketch-Map). On the Zonal Distribution of South Atlantic and Antarctic Vegetation. Ey

C. Skottsberg, Botanist of the Swedish Antarctic Expedition, 1991SCIENCE AND MATHEMATICAL MASTERS. 1993 (with Sketch-map).

Grueber and Dorville's Journey across Tibet. Messrs. NEEDES & SELLICKS,

Van der Grinten's Projection. By E. A. Reeves (with four figures).

The Monthly Record. (Medical and SCHOLASTIC Agency, Estab. 1860), Obituary :-Field-Marshal Sir Henry W. Norman, G.C.B., G.C-MG..

C.I.E. By T. H. H. Edward Stanford. By J. B. Clock House, Arundel Street, Strand, W.C. Correspondence :-Dr. Sven Hedin's Observations on Sand-dunes. By

Dr. Vaughan Cornish. “The Balkan Peninsula." By Professor E. Applications are invited for the following appts, :-(1) Public Sch., Nat.

Levasseur.
Sc. and Drawg., £150+ fees ; valuable post to good man. (2) Chem. and Meetings of the Royal Geographical Society, Session 1904-1905.
Physics-little English. Gaines preferred. £120, res. (3) Chem. + Mag-

Geographical Literature of the Month. netism and Electricity. £100, res. (4) Wrangler, Public School. £110, res.

New Maps and Illustrations. (5) County School, Maths. £110, non-res. Many January Appointments.

EDWARD STANFORD, 12, 13, 14 Long Acre, London, W.C.
SCIENCE AND
AND MATHEMATICAL

NOW READY.
MASTERSHIPS VACANT. Science Public College, £200 ; North
England. Chemistry and Physics, 6175. Mathematics and Chemistry,
Ireland, £150. Chemistry, £120. Mathematical, 6180.

With Illustrations, 28. 6d. net, by post 2s. 9d
A list of Masterships, England, Continent, and Over Sea, sent to all
Candidates.
ORELLANA

CO., Established over 40 years, 80 Wigmore Street, Cavendish Square, London, W. (late 44 Old Bond Street).

THEIR EMPLOYMENT in CANCER and A Gentleman engaged in Pure and Applied Research would be glad to hear of a commercial laboratory well

other DISEASES. equipped electrically, with a good mechanic, glass blower and chemist, where he could pursue his experiments with expedition. --Apply

BY "1833," c/o NATURE.

RICHARD J. COWEN, L.R.C.S.I., L.R.C.P.I., &c. For other Scholastic Advertisements, see pages lxiv and Ixv.

London : H. J. GLAISHER, 57 Wigmore Street, W. Substantial English Company desires to

extend its business by acquiring the British and Colonial rights of a JUST PUBLISHED. With 135 Illustrations and Coloured new Chemical Product which is likely to be used on a very large

Plate. Svo. Ios, 6d. net. scale for Industrial purposes. Advertisers have exceptional facilities for exploiting an invention of this kind. Offers, with full particulars, to be sent to Box 101, T. B. Browne's Advertising Offices, 163 Queen

, AN INTRODUCTION TO THE STUDY OF Victoria Street, E.C.

SPECTRUM ANALYSIS. FOREIGN SCIENTIFIC BOOKS By W. MARSHALL WATTS, D.Sc. (Lond.),

B.Sc. (Vict.), F.I.C., and Periodicals promptly supplied at lowest rates. Senior Physical Science Master in the Giggleswick School.

PROSPECTUS SENT ON APPLICATION.
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CATALOGUE OF ROCK-SECTIONS FOR THE MICROSCOPE. ZOOLOGICAL BOOKS AND PAPERS. Sections of Minerals, Metals, Bones, Teeth and Kindred Hard Substances. SAMPLE SLIDES (Faultlessly Mounted), 1s. EACH, Post FREE. Pl. 2.-GEOGRAPHICAL (comprising faunas of all countries). ALL BRANCHES OF BIOLOGY AND GEOLOGY.

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Pt. 1.-INVERTEBRATA, 36 pp. Now ready. Collections provided, nained, arranged or repaired.

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LESSONS IN LABORATORY OR BY CORRESPONDENCE.

38 GREAT QUEEN ST., LONDON, W.C. Medical, Science and Civil Service Students encouragedd.

With 30 Original Illustrations. Price as. 6d. Specify Wants and Estimates will be supplied by Return Post.

The HYGIENE of the MOUTH. Address to :-THE DIRECTOR, MICROLOGICAL LABORATORY AND STUDIO, A Guide to the Prevention and Control of Dental Diseases IT ASPENLEA ROAD, HAMMERSMITH, LONDON, W.

By R. DENISON PEDLEY, L.D.S. Eng., F.R.C.S. Ed.,

Dental Surgeon to the Evelina Hospital, Southwark. MINERALS, ROCKS, FOSSILS.

The DISEASES OF CHILDREN'S TEETH. A large stock of BRITISH AND FOREIGN MINERALS always on view.

Well Illustrated. Price 7s. 6d.
CORNISH MINERALS

SEGG & CO., 289 and 291 Regent Street, London, W.
A SPECIALITY.
Special display for Teachers and Students on Saturdays. Open till 7 p.m.

TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. RICHARDS' SHOW ROOMS,

TIFIC MSS. (Classical Tripas, Intermediate Arts, Cambridge Higher

Local, thorough acquaintance with Modern Languages). Research, 3 Beauchamp Place, Brompton Road, South Kensington,

Revision, Translation. Scale of charges on application. The Cam. London, S.W.

bridge Type-writing Agency, to Duke Street, Adelphi, W.C.

BY THE SAMR AUTHOR.

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