THE NEW COLLECTION OF 336 SPECIMENS AND SLIDES OF ROCKS, BIR KBECK BANK PHOENIX 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 Sottlements. description of the polarizing microscope and its application, and also of the Prompt Payment of Olaims. macroscopical and microscopical features of every specimen of this collec tion, by Professor Dr. K. Busz of the University of Münster. This LOSSBS PAID OVBR £28,000,000. 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 two 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. 2% Interest allowed on minimum Ia. 336 Slides ... ... ... ... 420 montbly balances when not drawn below £100. II. 250 Specimens of Rocks ... 270 Deposits. 21% Interest allowed on Deposit Accounts. IIa. 250 Slides ... .. ... ... 310 Advances made. Stocks and Shares bought and sold. , III. 165 Specimens of Rocks. 170 Apply C. F. Ravenscroft, Secretary, IIIa. 165 Slides ... COLLECTIONS OF MINERALS, FOSSILS, METEORITES, 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. 205 MICROSCOPICAL PETROGRAPHY. 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, 77.; Quarterly, 21/-;. or for the whole Series of 12 Monthly Parts & 48 Sections, 44 4s. LIVING SPECIMENS FOR THE MICROSCOPE. Naturalists and Manufacturers of BRANCHES OF NATURAL HISTORY. Classes, &c. Workmen true to Nature. (Five Doors from Charing Cross.) 1 New Catalogue (102 pp.) just issued, post free. 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. I 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. NOTICE.--Advertisements and business letters for Nature should be addressed to the Publishers; Editorial CHARGES FOR ADVERTISEMENTS. 6 s. d. Yearly . *Three Lines in Column Quarter Page, or Hall . 091a Column . Hall-yearly , . 014 61 Half-yearly · · · 0 15 6 . 1 15 0 One Sixteenth Page, or Eighth Col. 10 o Half a Page, or a Column 3 So Quarterly . , . 7 61 Quarterly . . .o 8 o One Eighth Page, or Quarter 1 Column 018 6 Whole Page . . 66 o • The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN C 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 NO. 1870, VOL. 72 [PRICE 15 CENTS Registered as a Newspaper at the General Post Office.) (All Rights are Reserved. - - - - - - - NEW PATTERN “NEWTONIAN” CHEAP THE “IDEAL” LABORATORY ELECTRIC LANTERN. CLAMP Price Lists Free. 5067 New Iron Body Lantern, with brass front, fitted on mahogany board, 4-in. double Condenser, best full-size achromatic Front Lens, and “Newtonian " Hand-Feed Arc Lamp. Complete in Case . £10 10s. NEWTON & Co., OPTICIANS TO HIS MAJESTY THE KING 3 FLEET STREET, LONDON. W. G. PYE & CO., SCIENTIFIC INSTRUMENT MAKERS, . GRANTA WORKS, CAMBRIDGE. PHOTOGRAPHIC LENSES. NEGRETTI & ZAMBRA'S LONG RANGE BAROMETERS A SIMPLE TREATISE. 1-, Post Free 1/3. the use of mathematics. 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 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, BIRKBECK COLLEGE CITY OF LONDON COLLEGE. 13 35. UNIVERSITY OF LONDON. ir New Session begins Monday, October 2, 1905. University Centres for Instruction in Preliminary and Intermediate Medical Studies have been established at University and King's Colleges. BREAMS BUILDINGS, CHANCERY LANE, E.C. The sees charged to Students for these Courses are as follows : FACULTY OF SCIENCE. (A) FOR COURSES REQUIRED BY THE UNIVERSITY DAY AND EVENING COURSES. E. MACKENZIE, Ph.D., D.Sc OF LONDON. Chemistry ... . WREN, Ph.D., B.A., B.Sc. COURSE. FEE. (ALBERT GRIFFITHS, D.Sc. .- Preliminary 1. Scien} Physics ... For the Course. tific, Part I. ... .. .. D. OWEN, B.A., B.Sc. B. W. CLACK, B.Sc. Repetition€4_45. per subject E. H. SMART, M.A. Mathematics (Practical and Lec(Physics, Chemis " W.G. Birt, B.A., B.Sc. For one year. tures). I try, Botany, Zoo s A. B. RENDLE, M.A., D.Sc. Botany ... ogy). ... . F. E. Fritsch, Ph.D., B.Sc. In Anatomy, Practical Zoology ... ! ... - H. W. UNTHANK, B.A., B.Sc. Anatomy and Physio Geology & Mineralogy ... Geo. F. HARRIS, F.G.S. logy for three years, Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M. with single attendances RESEARCH in Chemistry and Physics in well-equipped laboratories. 2.-Preliminary Scien: \ £57 155. in ore sum; at the Courses in Prac. French, German, Spanish, Russian, Dutch, & Itallan Classes. tific, Part II. and £63 in two equal tical Physiology, Or. EVENING CLASSES also in Biology, Physiology, Practical Geometry, Intermediate. instalments, ganic Chemistry (Pre- Building and Macbine Construction, Steam, Tbeoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating. Medica. ACTING IN CONJUNCTION WITH THE LONDON CHAMBER OF COMMERCE. Other subjects. } £4 45. per subject. } For the Course. WHITE ST., and ROPEMAKER ST., MOORFIELDS, E.C. (B) FOR COURSES FOR EXAMINATIONS BY THE (Near Moorgate and Liverpool Street Stations.) CONJOINT BOARD. PRINCIPAL: SIDNEY HUMPHRIES, B.A., LL.B. (Cantab.) COURSE. FEE. Michaelmas Term begins Monday, October 2nd. For the Course. EVENING CLASSES in ALL BRANCHES of SCIENCE Repetition(Chemistry, Physics, £3 35. per subject. For the Course. Well-equipped LABORATORIES for Practical Work in Biology). CHEMISTRY, BIOLOGY, BOTANY, GEOLOGY, and 2.- First all branches of PHYSICS. For three years, with single attendances at (Part IV.)& Second £63 os. in two Special Courses for London University Matric., Inter., and Final BA, Examination. 1 the Practical Physioequal instalments. B.Sc., Conjoint Board, Pharmaceutical and other examinations. Classes logy Courses. are also held in all Commercial Subjects, in Languages, Literature and Art. Repetition All Classes are open to both sexes. (Practical Physio ? For three months. SATURDAY COURSES for Matric., Inter., and Final B.A., B.Sc. logy). DAY COMMERCIAL and HIGHER COMMERCIAL SCHOOLS. Anatomy and Phy: Prospectuses, and all other information, gratis on application, 63 35. per subject. work beyond the three siology. DAVID SAVAGE, Secretary years. The Teachers are as follows: ST. THOMAS'S HOSPITAL, 1.-PRELIMINARY SCIENTIFIC COURSE, ALBERT EMBANKMENT, S.E. (UNIVERSITY OF LONDON.) UNIVERSITY COLLEGE : The WINTER SESSION will COMMENCE on OCTOBER 2. Chemistry (Inorganic and/Sir William RAMSAY, K.C.B., D.Sc., I Organic) ... F.R.S.; E. C. C. BALY, F.I.C. The Hospital occupies one of the finest sites in London, and contains 603 Beds. Organic Chemistry ... J. N. Collie, Ph.D., F.R.S. Entrance and other Scholarships and Prizes (26 in number), of the value Physics ... F. T. TROUTON, Sc.D., F.R.S. of more than £500, are offered for competition each year. Botany W. OLIVER, D.Sc., F.R.S. Upwards of 60 Resident and other Åppointments are open to Students Zoology ... ... E. A. MINCHIN, M.A., F.Z.S. after qualification. KING'S COLLEGE: A Students' Club forms part of the Medical School Buildings, and the Athletic Ground, nine acres in extent, situated at Chiswick, can be reached Chemistry (Inorganic and/J. M. THOMSON, LL.D., F.R.S. ; Organic) ... ... H. JACKSON, F.I.C., F.C.S. in forty minutes from the Hospital. A Prospectus, containing full particulars, may be obtained from the Physics ... Vacant.* Secretary, Mr. G. Q. Roberts. Botany ... W. B. BOTTOMLEY, M.A., Ph.D. J. H. FISHER, B.S. Lond., Dean. Zoology ... A. DENDY, D.Sc. PRELIMINARY SCIENTIFIC EXAMINATION, UNIV, LOND. UNIVERSITY COLLEGE : A Systematic Course of Instruction, including Practical Work, is given Anatomy ... ... ... G. D. THANE, M.R.C.S., F.Z S. at St. Thomas's Hospital Medical School, Albert Embankment. Physiology ... E. H. STARLING, M.D., F.R.S.: ... Full particulars may be obtained from the DEAN. *** G. A. BUCKMASTER, M.A., M.D. Attendance on this Course counts as part of the five years' curriculum." Pharmacology ... ... A. R. CUSHNY, M.D., C.M. KING'S COLLEGE: THE VICTORIA UNIVERSITY OF Anatomy ... ... ... P. THOMPSON, M.D., Ch.B. MANCHESTER. (W. D. HALLIBURTON, M.D., F.R.C.P.. Physiology ... ... . F.R.S. SESSION 1905-6. Pharmacology ... ... Vacant." The Session will commence on Wednesday, October 4 next. * The vacancies will be filled at an early date. The following prospectuses may be obtained on application to the Furt'ier information may be obtained on application to the undersigned. | REGISTRAR : FACULTIES OF ARTS AND SCIENCE. FACULTY OF LAW. Academic Registrar. FACULTY OF MUSIC. FACULTY OF COMMERCE. FACULTY OF MEDICINE. DEPARTMENT OF EDUCATION. DEPARTMENT OF ENGINEERING. DENTAL DEPARTMENT. PHARMACEUTICAL DEPARTMENT. PUBLIC HEALTH DEPARTMENT. Full particulars of the Courses qualifying for the Degrees in Chemistry and for the Certificate in Applied Chemistry will be forwarded on applica. i For other Scholastic Advertisements, see pages clxix, clxx, tion to the REGISTRAR. and clxxi. 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 J*R. A. LEHFELDT, B.A., D.Sc., and 1 *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 ... *. A. DAVENPORT, M.Sc. Electrical Engineering ... ... *J. T. MORRIS, M.I.E.E ARTS SIDE. 1*J. L. S. HATTON, M.A., and Mathematics ... ... ..' '*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 4 d., on application. JOHN L. S. HATTON, M.A., Director of Studies. The best cure for weak, thin Sold in tubes by all chemists. LEAFLETS GRATIS, UNIVERSITY COLLEGE, BRISTOL. BURROUGHS WELLCOME & Co. LONDON, SYDNEY AND CAPE Town. Chief Offices -Snow Hill Buildings, London, F.RES. (Vict.), Ph.D. Mathematics .............. (Professor--FRANK R. BARRELL, M.A. (Camb.), *1 B.Sc. (Lond.). Physics. Professor-ARTHUR P. CHaTTOCK, M.I.E.E. COORONT] PHO, 68 Professor--SIDNEY H. REYNOLDS, M.A. (Camb.), F.G.S. THE GLASGOW AND WEST OF Dublin). GLASGOW. The Diploma of the College is granted in the following Departments : Lady Tutor - Miss MARGARET J. TUKE, M.A. CIVIL ENGINEERING, MECHANICAL ENGINEERING, ELEC. Mistress of Method - Miss GERALDINE HODGSON, B A. TRICAL ENGINEERING, MINING, NAVAL ARCHITECTURE Full courses in preparation for the Engineering, Medical, Scientific and CHEMISTRY, METALLURGY, MATHEMATICS and PHYSICS. Teaching Professions. In conjunction with the Glasgow School of Art a Course for a Joint Diploma in Architecture has been arranged. For full information see Prospectus, which will be forwarded free on application. The Courses of Study for the Diploma usually extend over three Sessions. The Average Fee per Session is 212 12s. Special Courses for individual for the Degree of B.Sc. in ENGINEERING of the UNIVERSITY WESTMINSTER HOSPITAL MEDICAL OF GLASGOW after attendance for at least one Session upon pre. SCHOOL, scribed University Classes. New and well-equipped Laboratories in the Departments of Physics, Chemistry, Technical Chemistry, Metallurgy, CAXTON STREET, S.W. Mechanics, Mechanical and Electrical Engineering have been provided. The Preliminary Examination for Candidates for the Diploma begins on A SCHOOL OF THE UNIVERSITY OF LONDON. September 18. Names of intending candidates must be lodged not later The WINTER SESSION will commence on MONDAY, OCTOBER 2, than September 15, on forms which will be sent on application. 1995. Scholarships of the aggregate value of 6320 are offered to students CALENDAR (price, by post, 18. 4d.) and PROSPECTUS (gratis) will entering in October. Examination on September 26 and 27. Fees 110 Gns. be sent on application to the SECRETARY. if paid in one sum on entrance. For University Students and those who have completed their anatomical and physiological studies 70 Gns. Special WIGAN opportunities for Clinical work and for holding the various hospital appoint. ments, Dental students are specially provided for. MINING & TECHNICAL COLLEGE. Prospectus and further particulars may be obtained from the DEAN. Telegrams: "Clinic," London. Telephone : Victoria 765. Principal—THOMAS T. RANKIN, C.E., B.Sc., KING'S COLLEGE, LONDON. M. Inst. M.M., M.I.M.E. (UNIVERSITY OF LONDON.) Full Courses for Matriculated Students in Arts, Laws. Science, SANDWICH SYSTEM OF MINING TRAINING. Engineering, Medicine, and Thcology at Composition Fees; or Students DAY MINING COURSES. may attend the separate Classes. Preparation for all Examinations of the London University. Opening date, MONDAY, OCTOBER 2, at 9 a.m. MICHAELMAS TERM commences OCTOBER 3. Complete Diploma Course extends over a period of three or four years. For Prospectuses and all information apply to the SECRETARY, King's Two Prizes of 41o 1os. each awarded annually. College, Strand, W.C. Candidates for Colliery Managers' Certificates of Competency holding WOMEN'S DEPARTMENT, KENSINGTON. the above Diploma will be exempt from two out of the five years' practical MICHAELMAS TERM commences OCTOBER 9. experience required by the Coal Mines Regulation Act. Apply to the VICE-PRINCIPAL, 13 Kensington Square. The Home Secretary has approved for the purposes of the Coal Mines Regulation Act (1887) Amendment Act, 1903, the Diplomas of this College. For other Scholastic Advertisements, see pages clxviii, clxx, Prospectus post free on application to the PRINCIPAL, or and clxxi. T. RATCLIFFE ELLIS, Hon. Sec. |