336 SPECIMENS AND SLIDES OF ROCKS, BIRKBECK BANK PHOENIX THE NEW COLLECTION OF FIRE OFFICE, according to H. ROSENBUSCH: “Elemente der ESTABLISHED 1782. Gesteinslehre, 2d ed. 1901.” Moderate Rates. Absolute Security. Electric Accompanied by a text-book : "Practical Petrography," giving a short Lighting Rules Supplied. Liberal Loss Settlements. description of the polarizing microscope and its application, and also of the Prompt Payment of Olaims. į macroscopical and microscopical features of every specimen of this collec This LOSSES PAID OVER £28,000,000. tion, by Professor Dr. K. Busz of the University of Münster. collection is intended for the practical use of students, and contains typical representatives of all important types of rocks; it is composed of 277 massive rocks (94 deep-seated rocks, 50 dike rocks, 133 volcanic rocks), 28 sedimentary, and 31 crystalline schists. Out of it iwo smaller collections of 250 and 165 specimens have been selected. The prices are as follows :ESTABLISHED 1851. Collection I. 336 Specimens of Rocks 380 Marks. Current Accounts. 420 2% Interest allowed on minimum Ia. 336 Slides monthly balances when not drawn below £100. II. 250 Specimens of Rocks 270 Deposits. 21% Interest allowed on Deposit Accounts. Ila. 250 Slides 310 Advances made. Stocks and Shares bought and sold. III. 165 Specimens of Rocks 170 Illa. Apply C. F. RAVENSCROFT, Secretary, 205 165 Slides ... Southampton Buildings. High Holborn, W.C. COLLECTIONS OF MINERALS, FOSSILS, METEORITES, MINERALS, ROCKS, FOSSILS. PURCHASED FOR CASH OR EXCHANCED. A large stock of BRITISH AND FOREIGN MINERALS always on view. The fifth edition of Catalogue No. 4, Petrography, has just CORNISH MINERALS been published (210 pages), and will be sent free of charge on A SPECIALITY. Special display for Teachers and Students on Saturdays. Open till 7 p.m. application. RICHARDS' SHOW ROOMS, Dr. F. KRANTZ, 3 Beauchamp Place, Brompton Road, South Kensington, London, S.W. RHENISH MINERAL OFFICE, BONN-ON-RHINE, GERMANY. ESTABLISHED 1833. MICROSCOPICAL PETROGRAPHY. WATKINS & DONCASTER, Gentlemen interested in the above study are invited to send to JAMES R. GREGORY & CO., i Kelso Place, Kensington Court, London, W., for a Prospectus of THE TWENTIETH CENTURY ATLAS OF MICROSCOPICAL PETROGRAPHY, now being issued in Twelve Monthly Parts, each Part containing Four Fine Hall- Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 71; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s. LIVING SPECIMENS FOR THE MICROSCOPE. Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond' Life. Price is. per Tube, Post Free. Helix pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM. Naturalists and Manufacturers of BRANCHES OF NATURAL HISTORY. &c. Classes, &c. Workmen true to Nature. (Five Doors from Charing Cross.) I New Catalogue (102 pp.) just issued, post free. MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM. THE LABORATORY, PLYMOUTH, The following animals can always be supplied, either living or preserved by the best methods : Sycon; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, Alcy- For prices and more detailed lists apply to THE DIRECTOR. ROCKS, MINERALS, FOSSILS. COLLECTIONS IN POLISHED DEAL BOXES. 20 Coal Measure Rocks and Fossils, 12/6 ; do., larger, 15/-. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy. selection. Specimens sent on approval. Boxes, Models of Crystals, &c., &c. NEW CATALOGUE POST FREE. THOMAS D. RUSSELL, 78 Newgate St., London, E.C. Yearly . 1 15 NOTICE.--Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial CHARGES FOR ADVERTISEMENTS. 6 s. d. A s. d. 180 Yearly 6 *Three Lines in Column o 3 6 Quarter Page, or Half a Column Hall-yearly 09 015 6 One Sixteenth Page, or Eight Col. 10 °Half a Page, or a Column 3 5 8 o One Eighth Page, or Quarter Column 0 18 6 / Whole Page 6 6 • The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN G CO., Limited. OFFICE: ST. MARTIN'S STREET, LONDON, W.C. CATALOGUE OF Ultra-Violet Rays THE NEW Mercury Vapour Lamp NINTH EDITION. the latest and most modern apparatus for MADE OF teaching .. UVIOL GLASS Heat, Light, Sound, Frictional and Voltaic Electricity, For Physical and Medical Pneumatics, Hydrostatics, Mechanics, Purposes, Mensuration, Hygiene, &c. Current consumption only 2 to 3 ampères. EVERY INSTRUMENT CHEAPLY, EFFICIENTLY, AND ACCURATELY MADE. CATALOGUES SENT FREE, on application, to 85 MORTIMER STREET, LONDON, W. Schools, Colleges, and Institutions. TOWNSON & MERCER, 34 CAMOMILE ST., E.C. SESSION 1905-6. C. E. MÜLLER, ORME & CO., CONTRACTORS TO HIS MAJESTY'S GOVERNMENT, MANUFACTURERS OF APPARATUS FOR TEACHING CHEMISTRY, PHYSICS, MECHANICS, HYDROSTATICŚ, &c. DEALERS IN PURE AND COMMERCIAL CHEMICALS. STUDENTS' SETS OF APPARATUS. LISTS:-Chemical Apparatus-Chemicals-Balances-Assay-Thermometers-Electrical Apparatus-Focus Tubes, X-Ray, and Wireless Telegraphy Apparatus-or SPECIAL WHOLESALE (for Quantities)-free on application. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLA AND Co., LATED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, August 24, poz. A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE “ To the solid ground Of Nature trusts the mind which builds for aye.”--WORDSWORTH. No. 1870, VOL. 72] THURSDAY, AUGUST 31, 1905. [PRICE 15 CENTS Registered as a Newspaper at the General Post Office.) (All Rights are Reserved. PHOTOGRAPHIC LENSES. A SIMPLE TREATISE. 1-, Post Free 13. the use of mathematics. NEGRETTI & ZAMBRA'S LONG RANGE BAROMETERS THE DIAGONAL BAROMETER.- In this instrument the tube is much longer than usual, and at the point on the vertical column where in ordinary Mercurial Barometers the 28 inches would be marked, the tube is bent at an angle and the remaining 3 inches of the scale-viz. : 29, 30, and 31are extended over a tube 36 inches long.. The mercury now moving diagonally instead of vertically, travels over 12 inches of the tube to every inch on the vertical scale. The slightest variation, even 'or" to which the scale is divided, is at once noticeable and can be easily read without the aid of a vernier or magnifier. R. & J. BECK, Ltd., 68 CORNHILL, LONDON. PRACTICAL NOTES ON TELEPHOTOGRAPHY, Free on application to Further Particulars and Prices of this and other long range Barometers sent on application to the Manufacturers. NEGRETTI & ZAMBRA, 38 HOLBORN VIADUCT. BRANCHES : 45 CORNHILL, AND 122 REGENT STREET, THE VICTORIA UNIVERSITY OF UNIVERSITY OF LONDON. OF LONDON. FEE ATTENDANCE. 1.- Preliminary 1. Scien-} 626 55. For the Course. 44_45. per subject (Physics, Chemis For one year. try, Botany, Zoo- In Anatomy, Practical Anatomy and Physio. logy for three years, with single attendances 2.- Preliminary Scien: 657 155. in ore sum; at the Courses in Prac tific, Part II. and £63 in two equal tical Physiology, Or. ganic Chemistry (Pre- Medica. siology). ir New Session begins Monday, October 2, 1905. BIRKBECK COLLEGE BREAMS BUILDINGS, CHANCERY LANE, E.C. FACULTY OF SCIENCE. DAY AND EVENING COURSES. J. E. MACKENZIE, Ph.D., D.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. Qeology & 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, & Itallan 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. 600 CITY OF LONDON COLLEGE. } £4 4s. per subject. } For the Course. two peractical Physio £3 35. (B) FOR COURSES FOR EXAMINATIONS BY THE CONJOINT BOARD. FEE. ATTENDANCE. 1.-First Examination 421 os. } For the Course. For the Course. For three years, with 2.–First Examination 657 155. in one sum; 1 single attendances at (Part IV.)& Second £63 os. in the Practical PhysioExamination. equal instalments. logy Courses. Repetition For three months. logy). For each three months' Anatomy and Phy-} 63 35. per subject. work beyond the three years. The Teachers are as follows:1.-PRELIMINARY SCIENTIFIC COURSE, PARTS 1. AND II. Chemistry (Inorganic and Sir William RAMSAY, K.C.B., D.Sc., ... F.R.S.; E. C. C. BALY, F.I.C. F. T. TROUTON, Sc.D., F.R.S. F. W. OLIVER, D.Sc., F.R.S. E. A. MINCHIN, M.A., F.Z.S. Chemistry (Inorganic and/J. M. THOMSON, LL.D., F.R.S. ; . H. JACKSON, F.I.C., F.C.S. Vacant.* W. B. BOTTOMLEY, M.A., Ph.D. ... A. DENDY, D.Sc. ... ACTINO IN CONJUNCTION WITH THE LONDON CHAMBER OF COMMERCE. WHITE ST., and ROPEMAKER ST., MOORFIELDS, E.C. (Near Moorgate and Liverpool Street Stations.) PRINCIPAL: SIDNEY HUMPHRIES, B.A., LL.B. (Cantab.) Michaelmas Term begins Monday, October 2nd. 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 BA, DAVID SAVAGE, Secretary ALBERT EMBANKMENT, S.E. (UNIVERSITY OF LONDON.) The WINTER SESSION will COMMENCE on OCTOBER 2. The Hospital occupies one of the finest sites in London, and contains 603 Beds. Entrance and other Scholarships and Prizes (26 in number), of the value of more than £500, are offered for competition each year. Upwards of 60 Resident and other Appointments are open to Students after qualification. A Students' Club forms part of the Medical School Buildings, and the Athletic Ground, nine acres in extent, situated at Chiswick, can be reached in forty minutes from the Hospital. A Prospectus, containing full particulars, may be obtained from the Secretary, Mr. G. Q. Roberts. J. H. FISHER, B.S. Lond., Dean. PRELIMINARY SCIENTIFIC EXAMINATION, UNIV, LOND. A Systematic Course of Instruction, including Practical Work, is given at St. Thomas's Hospital Medical School. Albert Embankment. Full particulars may be obtained from ibe DEAN. MANCHESTER. SESSION 1905-6. FACULTIES OF ARTS AND SCIENCE. PUBLIC HEALTH DEPARTMENT. and clxxi. II.-INTERMEDIATE COURSE. G. D. THANE, M.R.C.S., F.Z S. JE H. STARLING, M.D., F.R.S. ; Physiology "G. A. BUCKMASTER, M.A., M.D. Pharmacology A. R. CUSHNY, M.D., C.M. P. THOMPSON, M.D., Ch.B. (W. D. HALLIBURTON, M.D., F.R.C.P., F.R.S. Vacant. P. J. HARTOG, University of London, Academic Registrar. South Kensington, S.W. MANCHESTER CHEMISTRY COURSE. Full particulars of the Courses qualifying for the Degrees in Chemistry and for the Certificate in Applied Chemistry will be forwarded on applica. tion to the REGISTRAR. ... EAST LONDON COLLEGE MILE END ROAD, E. SCIENCE AND TECHNICAL SIDE. /*J. L. S. HATTON, M.A., and ***W. F. S. CHURCHILL, M.A. Physics [*R. A. LEHFELDT, B.A., D.Sc., and * *W. H. WHITE, B.A., B.Sc. Chemistry /*J. T. HEWITT, M.A., D.Sc., Ph.D., ** and *C. SMITH, D.Sc. Botany *V. H. BLACKMAN, M.A. Engineering (*D. A. Low, M.I.M.E., and *J. A. DAVENPORT, M.Sc. Electrical Engineering *J. T. MORRIS, M.I.E.E ARTS SIDE. {*J: L. S. HATTON, M.A., and *W. F. S. CHURCHILL, M.A. Latin and Greek *F. R. EARP, M.A. English Language and Literature *KATE M. Warren. History *T. SeccoMBE, M.A. French *W. G. HARTOG, B.A. German CONSTANCE B. Low, M.A. *Recognised Teacher of the University of London. Fee for the full Day Course, 10 Guineas per Session. Numerous Scholarships of the value of £40 per annum, and tenable at the College for three years, are awarded by the Drapers' Company. Evening Courses for the Science and Engineering degrees are also beld, the fees for which are from Two Guineas to Five Guineas per Session. CALENDAR, post free 4fd., on application. JOHN L. S. HATTON, M.A., Director of Studies. UNIVERSITY COLLEGE, BRISTOL. FACULTY OF ARTS AND SCIENCE. (Professor-MORRIS W. TRAVERS, D.Sc. (Lond.), F.R.S. Chemistry Assistant Professor-Francis E. FRANCIS, D.Sc. (Vict.), Ph.D. Mathematics (Professor--FRANK R. BARRELL, M.A. (Camb.), B.Sc. (Lond.). Physics Professor-ARTHUR P. CHATTOCK, M.I.E.E. Engineering (Professor-ROBERT M. FERRIER, M.Sc. (Durh.), B.Sc. (Glas.), M. Inst.C.E. Geology and Zoology Professor-SIDNEY H. REYNOLDS, M.A. (Camb.), F.G.S. Psychology Professor-THE PRINCIPAL. Modern History Prufessor-G. H. LEONARD, M.A. (Camb.). English Literature and {Professor-R. P. Cow, M.A. (Trinity Coll., Language Dublin). Classics Professor-FRANCIS BROOKS, M A (Oxon.). Le turers in Chemistry, Mathematics, Physics, Engineering, Botany, Physiology, Logic and Economics, History and Literature, Greek, Latin, Hebrew, French, German, Italian, Oriental Languages, and Music. Lady Tutor---Miss MARGARET J. TUKE, M.A. Mistress of Method - Miss GERALDINE HODGSON, B A. Full courses in preparation for the Engineering, Medical, Scientific and Teaching Professions. For full information see Prospectus, which will be forwarded free on application. JAMES RAFTER, Registrar and Secretary. THE GLASGOW AND WEST OF SCOTLAND TECHNICAL COLLEGE, GLASGOW. SESSION begins TUESDAY, SEPTEMBER 26, 1905, in the new buildings recently erected for the College. The Diploma of the College is granted in the following Departments :CIVIL ENGINEERING, MECHANICAL ENGINEERING, ELEC. TRICAL ENGINEERING, MINING, NAVAL ARCHITECTURE, CHEMISTRY, METALLURGY, MATHEMATICS and PHYSICS. In conjunction with the Glasgow School of Art a Course for a Joint Diploma in Architecture has been arranged. The Courses of Study for the Diploma usually extend over three Sessions. The Average Fee per Session is 212 12s. Special Courses for individual Students are arranged as required. Holders of the Diploma are eligible for the Degree of B.Sc. in ENGINEERING of the UNIVERSITY OF GLASGOW after attendance for at least one Session upon pre. scribed University Classes. New and well-equipped Laboratories in the Departments of Physics, Chemistry, Technical Chemistry, Metallurgy, Mechanics, Mechanical and Electrical Engineering have been provided. The Preliminary Examination for Candidates for the Diploma begins on September 18. Names of intending candidates must be lodged not later than September 15, on forms which will be sent on application. CALENDAR (price, by post, is. Ad.) ang PROSPECTUS (gratis) will be sent on application to the SECRETARY. WIGAN MINING & TECHNICAL COLLEGE. WESTMINSTER HOSPITAL MEDICAL SCHOOL, CAXTON STREET, S.W. A SCHOOL OF THE UNIVERSITY OF LONDON. The WINTER SESSION will commence on MONDAY, OCTOBER 2, 1935. Scholarships of the aggregate value of 6320 are offered to students entering in October. Examination on September 26 and 27. Fees 110 Gns. if paid in one sum on entrance. For University Students and those who have completed their anatomical and physiological studies 70 Gns. Special opportunities for Clinical work and for holding the various hospital appoint. ments. Dental students are specially provided for. Prospectus and further particulars may be ob'ained from the Dean. Telegrams: "Clinic," London. Telephone : Victoria 765. (UNIVERSITY OF LONDON.) Full Courses for Matriculated Students in Arts, Laws. Science, Engineering, Medicine, and Theology at Composition Fees; or Students may attend the separate Classes. Preparation for all Examinations of the London University. For Prospectuses and all information apply to the Secretary, King's College, Strand, W.C. WOMEN'S DEPARTMENT, KENSINGTON. MICHAELMAS TERM commences OCTOBER 9. Apply to the VICE-PRINCIPAL, 13 Kensington Square. For other Scholastic Advertisements, see pages clxviii, clxx, and clxxi. Principal—THOMAS T. RANKIN, C.E., B.Sc., M. Inst. M.M., M.I.M.E. SANDWICH SYSTEM OF MINING TRAINING. DAY MINING COURSES. Opening date, MONDAY, OCTOBER 2, at 9 a.m. Complete Diploma Course extends over a period of three or four years. Two Prizes of £10 ios. each awarded annually. Candidates for Colliery Managers' Certificates of Competency holding the above Diploma will be exempt from two out of the five years' practical experience required by the Coal Mines Regulation Act. The Home Secretary has approved for the purposes of the Coal Mines Regulation Act (1887) Amendment Act, 1903, the Diplomas of this College. Prospectus post free on application to the Principal, or T. RATCLIFFE ELLIS, Hon. Sec. |