IMPORTANT ANNOUNCEMENT. D'Arsonval's Latest (1904) Apparatus, DISPENSING WITH COILS & INTERRUPTERS. X-RAYS & HIGH-FREQUENCY CURRENTS. (Protected by Numerous Patents.) SILENT IN WORKING. SIMPLE IN MANIPULATION. This apparatus has been already installed by many of the chief workers in Electro-Therapeutics in France and England. WATSON'S where the apparatus may be seen working. MICROSCOPES & OBJECTS. White for Catalogue No. 3 of Micro. Objects, together with newly For all the above see WATSON's 158-page Catalogue of Microscopes, sent published supplementary list of Slides, giving details of recently post free. 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. RADIUM of MAXIMUM activity in stock, also of medium and moderate activities. Send for particulars. W. WATSON & SONS, 313 HIGH HOLBORN, LONDON, W.C. BRANCH-16 Forrest Road, Edinburgh. ESTABLISHED 1837. 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 CROSSLEY BROS., LTD., OPENSHAW, MANCHESTER. THE NEW STIGMATIC LENS. SERIES II. F/6. BRITISH DESIGN AND WORKMANSHIP. EQUIVALENT TO FOUR LENSES AT THE PRICE OF ONE. CATALOGUE OF HIGH-CLASS CAMERAS AND LENSES, POST FREE. J. H. DALLMEYER, Ltd., 25 NEWMAN ST., OXFORD ST., LONDON. W Printed by KICHARD CLAY AND SONS, LIMITED, at 7 & 6 Dread Sheet hill, Queen Victoria Street, in the City o London, and puuushed by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, Dec. 8, 1904. 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" (Experimentally Illustrated). On December 27 (Tuesday), Deceber 29, 31, 1904, January 3, 5. 7, 1905. Tuesdays. Lecture Hour, Five o'clock. Professor 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, 11. 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 Tempest." On Thursdays, January 19, 26. Recent 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 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 Thursdays, 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 "Archæology." 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 "Some Controverted Questions of Optics." On Saturdays, April 1, on 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 Afternoon 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 a Discourse on New Low Temperature Phenomena." Succeeding Discourses will probably be given by 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 G. 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 immediately 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 Guin-as. 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. 6.; Double, 4s.] may be had from the Secretary, Mr G. W C. KAYE. UNIVERSITY OF LONDON. NOTICE IS HEREBY GIVEN that on WEDNESDAY, March 22 next, the Senate will proceed to elect Examiners in the following Depart ments for the year 1905-6. FOR EXAMINATIONS ABOVE THE MATRICULATION. The Examiners appointed may be called upon to take part in the Examination of both Internal and External Students. The remuneration of each Examinership consists of a Retaining Fee for the year, and a ra rata payment for Papers set, Answers marked, and Meetings attended. Full particulars can be obtained on application to the PRINCIPAL SCHOOL. CHEMICAL, PHYSICAL AND BOTANICAL APPARATUS. The above-named Council invite tenders for the supply of CHEMICAL, PHYSICAL and BOTANICAL APPARATUS for the new Technical College and Secondary Day School at East Ham. Particulars, Schedule and Form of Tender may be obtained upon application to Mr. W. H. BARKER, B.Sc., Principal of the College, Town Hall, i East Ham, on and after Monday next, the 19th inst., upon the deposit of the sum of one guinea, which will be returned on receipt of a bona fide tender. Tenders to be delivered addressed to "The Chairman, Works SubCommittee, Town Hall, East Ham, E.," and endorsed "Tender for Chemistry Apparatus, &c.," not later than 12 o'clock noon of Thursday, December 29, 1904. 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 of labour, and to also enter into a contract with a bond for the due and proper performance of the contract. The Council does not bind itself to accept the lowest or any tender. Town Hall, East Ham, E., C. E. WILSON, Town Clerk. THE VICTORIA UNIVERSITY OF MANCHESTER. The Council desires to proceed to the APPOINTMENT of a PRO- The Professor will be responsible for the organisation of the Engineering 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 per annum during the first three years. A detailed statement of the conditions of appointment may be obtained from the REGISTRAR. Applications, with references and such testimonials (not exceeding three in number) as the candidate may desire, should be sent on or before February 15 to the REGISTRAR. TO SCIENCE AND MATHEMATICAL COLOUR In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for Especial Course of Instruction in THERAPEUTICS, PHARMA. 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. TECHNICAL COLLEGE. WANTED, an ASSISTANT competent to give instruction in the theory, and practice of the construction, and use of Optical Apparatus. Salary commencing at 100 per annum. Apply in the first instance by I tter, stating age and details of experience, to Prof. AYRTON, City and Guilds Central Technical College, Exhibition Road, London, S.W. 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 the 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/Send for New Booklets, post free to readers of "Nature," or call and see results obtained by amateurs. SANGER-SHEPHERD & CO., 5, 6, 7 Gray's Inn Passage, Red Lion Street, Holborn, London. KING EDWARD'S SCHOOL, BIRMINGHAM. A There will be a vacancy in January for an ASSISTANT SCIENCE MASTER in the Boys' High School. A Biologist (Botany and Zoology) is desired. who is also familiar with general Laboratory practice and able to teach Physics and Chemistry up to at any rate Matrículation standard. Cambridge First Classman will receive some preference. Commencing salary (non-resident) from £160 to £205, according to experience and qualifications. Applications, accompanied by copies of testimonials, should be sent in not later than December 31 to R. CARY GILSON, Esq., King Edward's School, Birmingham. 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., £150+fees; valuable post to good man. (2) Chem. and Physics-little English. Games preferred. £120, res. (3) Chem. +Mag. netism and Electricity. £100, res. (4) Wrangler, Public School. £110, res. (5) County School, Maths. £110, non-res. Many January Appointments. THE GEOGRAPHICAL JOURNAL. PRICE 25. CONTENTS.-DECEMBER. The Antarctic Meeting at the Albert Hall (with Plate of Special Antarctic Medal). England and Wales viewed Geographically. By Hugh Robert Mill, D.S. (with Map). The Fulani Emirates of Northern Nigeria. By Major J. A. Burdor F.R.G.S., Resident of the Sokoto Province (with nine Illustrations) Captain J. Liddell's Journeys in the White Nile Region (with three las trations and Sketch-Map). On the Zonal Distribution of South Atlantic and Antarctic Vegetation. E C. Skottsberg, Botanist of the Swedish Antarctic Expedition, 19011993 (with Sketch-map). Grueber and Dorville's Journey across Tibet. Van der Grinten's Projection. By E. A. Reeves (with four figures). Obituary:-Field-Marshal Sir Henry W. Norman, G.C.B., G.C.M.G., Correspondence:-Dr. Sven Hedin's Observations on Sand-dunes. By By Professor £ 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 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 Victoria Street, E.C. FOREIGN SCIENTIFIC BOOKS and Periodicals promptly supplied at lowest rates. CATALOGUES POST FREE ON APPLICATION. W. MULLER, 59 CASTLE STREET EAST, OXFORD STREET, LONDON, W. ROCK-SECTIONS FOR THE MICROSCOPE. Sections of Minerals, Metals, Bones, Teeth and Kindred Hard Substances. SAMPLE SLIDES (Faultlessly Mounted), 1S. EACH. POST FREE. ALL BRANCHES OF BIOLOGY AND GEOLOGY. Micro-specimens mounted or made to order, from 18. each. Collections provided, named, arranged or repaired. Exact original water colour or etched drawings executed. LESSONS IN LABORATORY OR BY CORRESPONDENCE. Medical, Science and Civil-Service Students encouraged. Specify Wants and Estimates will be supplied by Return Post. Address to:-THE DIRECTOR, MICROLOGICAL LABORATORY AND STUDIO, 11 ASPENLEA ROAD, HAMMERSMITH, LONDON, W. MINERALS, ROCKS, FOSSILS. A large stock of BRITISH AND FOREIGN MINERALS always on view. CORNISH MINERALS A SPECIALITY. Special display for Teachers and Students on Saturdays. Open till 7 p.m. RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington, London, S.W. Plate. 8vo. IOS. 6d. net. INTRODUCTION TO THE STUDY OF By W. MARSHALL WATTS, D.Sc. (Lond.), Senior Physical Science Master in the Giggleswick School. LONGMANS, GREEN & CO., 39 PATERNOSTER ROW, JOHN LONDON, E.C. WHELDON CATALOGUE OF |