BIRKBECK COLLEGE. BREAMS BUILDINGS, CHANCERY LANE, EC. FACULTY OF SCIENCE. Chemistry Physics... Mathematics Botany DAY AND EVENING COURSES. ... ... JJ. E. MACKENZIE, Ph.D., D.Sc. H. WREN, Ph.D., B.A., B.Sc. (ALBERT GRIFFITHS, D.Sc. D. OWEN, B.A., B.Sc. B. W. CLACK, B.Sc. E. H. SMART, M.A. 1 W. G. BIRT, B.A., B.Sc. A. B. RENDLE, M.A., D.Sc. F. E. FRITSCH, Ph.D., B.Sc. 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, 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 CITY OF LONDON COLLEGE. INSTITUTE, JEWRY STREET, ALDGATE, E.C. Principal CHARLES A. KонN, M.Sc., Ph.D., F.I.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 therewith. Also preparation for the B.Sc. Examination of London University. Chemistry Physics Metallurgy Mathematics CHARLES A. KонN, M.Sc., Ph.D., F.I.C., and H. BURROWS, A. R.C.S., Ph.D., F.I.C. R. S. WILLOWs, D.Sc., M.A. C. O. BANNISTER, Assoc. R.S.M. Every facility for special and advanced practical work in well-equipped laboratories both in the afternoon and evening. NEW SESSION began MONDAY, SEPTEMBER 26. The Institute is readily accessible and near to Fenchurch Street, Liverpool 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. BALLIOL COLLEGE, CHRIST CHURCH, AND TRINITY COLLEGE, OXFORD. A Combined Examination for Natural Science Scholarships and Exhibitions will be held by the above Colleges, beginning on TUESDAY, DECEMBER 6, 1904. Three Scholarships and three Exhibitions will be offered; with one exception the value of these endowments will be £80 a year. The Subjects for Examination will be Physics, Chemistry, and Biology. Candidates will not be expected to offer more than two of these. Particulars may be obtained by application to D. H. NAGEL, Trinity College, Oxford. BOROUGH OF LONGTON (STAFFS.) EDUCATION COMMITTEE. LONGTON HIGH SCHOOL (SECONDARY DAY SCHOOL) AND SUTHERLAND TECHNICAL INSTITUTE. WANTED, to commence duty at the beginning of January next, an ASSISTANT MASTER for LANGUAGES, to teach French and German; should also be able to teach Elementary Latin in the Evening Classes. Salary, £120 per annum. Applications, stating age, qualifications, and previous experience, and accompanied by copies of not more than three recent testimonials, to be sent in to the undersigned not later than November 24, 1904. W. T. COPE, Secretary to the Education Committee. Court House, Longton. 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. B.A. AND B.Sc. EXAMS. MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE and ORAL TUITION on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based success. on 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. PATENT OFFICE APPOINTMENTS. Instruction in all the subjects of this Examination, in Day and Evening Classes. Six students gained appointments at the July Examination. Birkbeck College, Breams Buildings, Chancery Lane, E.C. TO SCIENCE AND MATHEMATICAL MASTERS.-January (1905) Vacancies.-Required (1) Two Masters for Mathematics and Experimental Physics. Salaries, £160 and £150 respectively. (2) Science and Drawing. £150. (3) Graduate or Inter. B.Sc. for Science and Math. 100, resident. (4) Chemistry and Physics. 100, resident. (5) Graduate for Science and Form work. £100, resident. For particulars of the above and many other vacancies, address GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand, London. Englishman (27), with Five Years' German University Training and Ph.D. degree, speaking German fluently, desires situation in Manufactory, preferably of Dyes or Organic Chemicals. Apply to "W.," c/o NATURE. For other Scholastic Advertisements, see page xii. Three First-class Telescopes: 4" clear aperture, perfect definition, with starfinder, astro. and day eyepieces, &c., rigid mahogany garden stand, ALWAYS RELIABLE HANDY INANY DARK ROOM ABSOLUTELY INDISPENSABLE Sold by all Chemists BURROUGHS WELLCOME & CO. SNOW HILL BUILDINGS, LONDON. RECTIFIED SPIRIT (SPIRITS OF WINE). B.P. and higher strengths. Duty paid; or Duty new condition, price £22: 34" clear aperture, similar accessories and stand, METHYLATED METHYLATED SPIRIT price only £10 10s.; 31", with similar accessories, but with brass pillar and claw stand, in addition to garden stand, only £9 10s.-Zeiss' Prismatic Field Glass, cost £11, offered for £6.-Bacteriological MicroScopes by BROWNING, POWELL & LEALAND, and others; complete outfit, including best substage illuminator and " or " objectives, for £11.3 Petrological Microscopes by WATSON, and SWIFT, in perfect order, from £7.-3 Students' Microscopes, from £2 10s.-Microscope Objectives by all best makers, " for £2 10s., " for £3 3s., on approval.-Microscope Slides, 50 for 12s., or customer's choice 4s. per dozen from parcels sent on approval.-Slide Cabinets, Air Pumps, Electrical Apparatus, and numerous Educational Appliances for Schools and Colleges at lowest possible prices. Rev. H. MILLS, Greenside, Kendal. COLOUR Special Quotations to large BOORD & SON, DISTILLERS SINCE 1750, PHOTOGRAPHY. LONDON, S.E. 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. APPLICATIONS to fill a vacancy at present existing are invited from thoroughly competent young men, experienced in the various departments of a wholesale house, and with pharmaceutical qualifications. Essential requirements are-First-rate business abilities. resource, initiative, energy, power of organisation and keen commercial instincts. A progressive position for a clever and energetic administrator, capable of assuming control of a complete staff. Personal interview necessary. Full particulars of experience age, and salary required to BROXA," West End Advertising Agency, Ltd., 195 Oxford Street, W. OWEN'S SCHOOL, ISLINGTON. WANTED in January, PHYSICS MASTER and CHEMISTRY MASTER. Must have had experience in good laboratories, and be able to lecture and illustrate by experiments in an efficient manner. There are two Science Masters on each side. Commencing salary, 150. Apply at once, giving age, qualification, experience, and copies of three recent testimonials, to the HEAD MASTER. Substantial English Company desires to 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 exploiting an invention of this kind. Offers, with full particulars, to be sent to Box 101, T. B. Browne's Advertising Offices, 163 Queen Victoria Street, E.C. Required by Manufacturer of Scientific Instruments, an Assistant, to take charge of adjustment of highly accurate Resistance Coils. One having technical training preferred. Box 28, c/o NATURE. For other Scholastic Advertisements, see page x. BAUSCH & LOMB'S CENTRIFUGES As supplied to H. M. War Department & the Medical Profession TWO SPEED CENTRIFUGE, complete with Haematokrit, Urine and Sputum Sedimentation Apparatus, SINGLE SPEED CENTRIFUGE, Urine Sedimentation Attachment, £2 0 0. The only Centrifuges having Spiral Gear. They require hal the power of other makes to run them at a given speed. THE MOST PERFECT INSTRUMENTS MADE. PLEASE WRITE FOR SPECIAL LIST. Write for Illustrated Microscopical Catalogue, 3 Stamps to cover postage. Also Lists of Microtomes, Centrifuges, Photographic Shutters, and Lenses of all descriptions, to A. E. STALEY & CO., 19 THAVIES INN, HOLBORN CIRCUS, COX'S X-RAY, HIGH-FREQUENCY, ELECTRO-THERAPEUTIC APPARATUS Practically Everlasting. COX'S INDUCTION COILS We have now added a Special Department for the manufacture of ACCUMULATORS, enabling us to produce same at first cost combined with large output and great durability. NEW ILLUSTRATED CATALOGUE (including Instructions to Beginners) Post Free. HARRY W. COX, Ltd., Actual Manufacturers. 1a ROSEBERY AVENUE, & 15-21 LAYSTALL ST., LONDON, E.C. (Removed from Cursitor Street.) Radium Clocks. RADIUM Descriptive Pamphlet of this Spectroscope 2,000,000 Unit Strength. 2 tubes of 5 mgs. each and 1 tube of 2 mgs. ON HIRE. EMANIUM A new radio-active substance from Pitchblende. It gives large and more effective sparks on a phosphorescent screen than Radium or Polonium, and is considered better for the Spinthariscope. A few decigramme tubes for sale at 30- the decigramme. RADIO-ACTIVE MUD Sample Bottle 1/6 Post Free. ARMBRECHT, NELSON & CO., 71, 73 DUKE ST., GROSVENOR SQ., LONDON, W. Shows a magnificent display of scintillations, showers of sparks, direct from the mineral Pitchblende, Radium, Polonium, Uranium, Thorium, or any radio-active substance, even a Welsbach mantle contains sufficient Thorium to excite the very sensitive screen of the Scintilloscope, which is far more sensitive than the Spinthariscope. The Scintilloscope rivals the most delicate Electroscope as a detector of Alpha rays. The eye sees an inexhaustible shower of stars of white light, giving a very realistic idea of the ceaseless activity of these marvellous substances which are producing the terrific bombardment causing this beautiful display. See NATURE, September 29, page 535. Glew's Scintilloscope Superior Lens, with Extra-sensitive Pitchblende and Polonium Screens, giving brilliant effects, Complete, 7s. 6d., Post free, U.K. Foreign Postage extra, weight 2 ounces. Pieces of Pitchblende mineral, ground flat and polished, with Sensitive Radio-active supplies of every description, on Sale or Hire. Radium F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900), NEW WAVE-LENGTH SPECTROSCOPE (CONSTANT DEVIATION). The special advantages of this Spectroscope are-the Collimator and Telescope are fixed at right angles, thus the instrument will stand in a corner, and is always ready for use and in adjustment. The Prism is of special form and automatically sets itself at minimum deviation. READS IN WAVE-LENGTHS DIRECT & WITH GREAT ACCURACY. GOLD MEDAL AWARDED, ST. LOUIS EXHIBITION, 1904. ADAM HILGER, Ltd., 75a Camden Road, London, N.W. |