JOURNAL OF ANATOMY AND PHYSIOLOGY, NORMAL AND PATHOLOGICAL, HUMAN AND COMPARATIVE. CONDUCTED BY PRINCIPAL SIR WILLIAM TURNER AND PROFESSORS D. J. CUNNINGHAM, G. S. HUNTINGTON, CONTENTS OF PART II.-JANUARY, 1905. J. T. Wilson, M.B. Fourth Molar Teeth in an Australian Aboriginal and a New Caledonian. (Plates XXIX.. XXX.) John Cameron, M.D. The Development of the Retina in Amphibia. (Plates XXXI, XXXII.) Frank S. Poole, B.A. The Superior Oblique Muscle of the Eye. P. P. Laidlaw, B.A. The Os Calcis. (Plates XXXIII.-XXXVII.) T. L. Bunting, M.D. The Histology of Lymphatic Glands. London: CHARLES GRIFFIN AND COMPANY, LTD., NOW READY. With Illustrations, 2s. 6d. net, by post 2s. 9d. X-RAYS: THEIR EMPLOYMENT in CANCER and other DISEASES. BY RICHARD J. COWEN, L.R.C.S.I., L.R.C.P.I., &c. London: H. J. GLAISHER, 57 Wigmore Street, W. MESSRS. HEFFER & SONS' PUBLICATIONS. GENERAL SCIENCE. FOR MEDICAL STUDENTS AND PRACTITIONERS. Crown 8vo. 5s. net. EXERCISES IN PRACTICAL PHYSIOLOGICAL FOR SENIOR CLASSES IN SCIENCE SCHOOLS. PRACTICAL EXERCISES in CHEMICAL PHYSI- Prepared for the use of students working for the examination in Physiology, Stages I, II, III, and Honours of the Science Department of the Board of Education. PRACTICAL PHYSICS FOR SCHOOLS. By First Year. MENSURATION, MECHANICS and HYDRO- 25. 6d. W. HEFFER & SONS, CAMBRIDGE. SIMPKIN MARSHALL, LONDON. With 30 Original Illustrations. Price 2s. 6d. A Guide to the Prevention and Control of Dental Diseases. BY THE SAME AUTHOR. The DISEASES of CHILDREN'S TEETH. Well Illustrated. Price 7s. 6d. SEGG & CO., 289 and 291 Regent Street, London, W. FOREIGN SCIENTIFIC BOOKS JOHN and Periodicals promptly supplied at lowest rates. CATALOGUES POST FREE ON APPLICATION. W. MULLER, 59 CASTLE STREET EAST, OXFORD STREET, LONDON, W. SEND FOR NEW LIST OF Microscopical Specimens in MARINE ZOOLOGY POST FREE ON APPLICATION. LIST OF SECOND-HAND INSTRUMENTS ALSO POST FREE. C. BAKER, 244 HICH HOLBORN, LONDON. 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 Is. 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. ZOOLOGICAL BOOKS AND PAPERS. Pt. 2.-GEOGRAPHICAL (comprising faunas of all countries). Carefully classified for reference. Ready in a few days. SENT POST FREE ON APPLICATION. 38 GREAT QUEEN ST., LONDON, W.C. Sale by Auction. GENERAL NATURAL HISTORY AND ENTOMOLOGICAL SPECIMENS-FINE COLLECTION OF MINERALS & FOSSILS. JANUARY 17, AT HALF-PAST 12 O'CLOCK. MR. J. C. STEVENS will Offer at his Rooms, 38 King Street, Covent Garden, London, W.C., COLLECTION of LEPIDOPTERA, including some rare Specimens, in fine condition -Eggs, and Cabinets of various sizes-Heads and Horns of Big Game; a COLLECTION of MINERALS and FOSSILS in CABINET Skins and Mounted Specimens of Birds and Animals. On view day prior 10 to 4, and morning of sale. MINERALS, ROCKS, FOSSILS. A large stock of BRITISH AND FOREIGN MINERALS always on view. CORNISH MINERALS A SPECIALITY. Special display for Te achers and Students on Saturdays. Open till 7 p.m. RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington, London, S.W. KYMOGRAPHS. RADIUM. PRICE £32:0:0 Delivery from Stock. Pitchblende, from 2/- to 30/- per piece; in Powder, 2/6 per cz. Kunzite, selected, 2/- per gramme. Carnotite, 2/- per Aeschynit, 2/- per oz. Emanium, 30/- per decigramme. Sparteite (see NATURE, March 31, 1904, page 523), 2/- per piece. Chlorophane, 2/- per piece. Samarskite, 2/- per oz. Zinc Sulphide, green and yellow, 5/- per tube. Oz. Rad. Residue, 2/- per tube. Polonium, 21/- per gram; 11/--gram. Polonium on Bi. rod., 25/-. Willemite, 2/- per oz. Flexible Sandstone, 5/- to 50/-. (See NATURE, June 23, 1904, page 185.) Radio-active Mud, 1/6 per bottle. Monazit, 3/- per oz. Monazit Sand, 1/- per oz. Bar. Plat. Cyan., for Screens, 3/- gramme, 60/- oz. Crystals, 4/gramme. Screens, 9d. per square inch. Radio-active screens, 6d. per square inch. Willemite screens, 6d. per square inch. Electroscopes (special), 21/Spinthariscopes (special), 21/-, 10/6 and 7/6. Selection of Minerals in boxes, 2/6, 5/6, 10/6 and 21/-. Drum speed continuously adjustable. Clockwork Drive with new and exact Governor. The Drum can be placed vertical, horizontal, or at any inclination. Also in Stock, Ludwig Continuous Paper Kymograph. Price £45 0 0 The Cambridge Scientific Instrument Co., Ltd., CAMBRIDGE, ENGLAND. THE SYTAM SYSTEM of arranging Bottles, Books, Apparatus, Pamphlets, Specimens, MSS., Correspondence, "Copy," &c. Saves an incredible amount of wall space and completely utilises dark corners, recesses, and out-of-the-way places. Prevents crowding and confusion. Allows for extension as and when required. Always room for more, hence reorganisation seldom or never necessary. Saves time, lightens work, and increases comfort by producing perfect order in the Laboratory, Library, Study, Home, Office, &c. AN EXAMPLE OF WHAT THE SYSTEM ACCOMPLISHES:One hundred 4 oz. bottles are arranged in one Sytam Bottle-Element occupying less than 1 sq. ft. of wall space, each bottle is instantly located, removed or replaced, and any size from oz. to a Winchester can be accommodated in one and the same element. BOOK-SPACE ECONOMISED IN LIKE MANNER. THE SYTAM FITTINGS CO., SCINTILLOSCOPE PATENT SCREEN PITCH BLENDE SCINTILLOSCOPE (PATENT). 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. I 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 Screen attached, for use in Scintilloscope or with any strong pocket magnifier, from 75. 6d. each, according to size. Radio-active supplies of every description, on Sale or Hire. Radium Bromide, 1,800,000 units on hire for lectures. 18 & 19 BASINGHALL BUILDINGS, LEEDS. F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900), 156 Clapham Road, London, S. W. RICHARD CLAY AND SONS, LTD., BREAD ST. HILL, E.C., AND BUNGAY, SUFFOLK. 44061 A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE "To the solid ground No. 1838, VOL. 71] Of Nature trusts the mind which builds for aye."-WORDSWORTH. Registered as a Newspaper at the General Post Office.] NEWTON & CO.'S REYNOLDS & BRANSON, Ltd. LONG-RANGE LABORATORY FURNISHERS and MANUFACTURING CHEMISTS. THE NEW BOOK PRICE ONE SHILLING. Containing an original description of the principles and function of the photographic lens. Together with the latest workshop methods. Then there follows a series of chapters on practical photography and the effect of lenses on results. The chief types are discussed and compared by means of original diagrams. Also an appendix on the Gauss Theory and on a new system of lens testing. The book is entitled "PHOTOGRAPHIC LENSES: A SIMPLE TREATISE." By CONRAD BECK and HERBERT ANDREWS. 350 Pages, 45 Engravings, 150 Diagrams, Cloth Bound. R. & J. BECK, Ltd., 68 CORNHILL, LONDON. THE NEW PATTERN COMBINED BARO-THERMOGRAPH. The above instrument combines in one apparatus the Recording Barometer and Recording Thermometer, giving thus on one and the same chart continuous records of the atmospheric pressure and temperature for seven days. VERY SUITABLE FOR PRESENTATION. Illustrated Price List of Self-Recording Meteorological Instruments, or "Special" Illustrated List of Scientific goods suitable for Presents, Post Free to all parts of the World. 38 HOLBORN VIADUCT, E.C. Branches-45 CORNHILL, and 122 REGENT STREET. COUNTY SCHOOL, GRAVESEND. Wanted immediately, a SENIOR SCIENCE MASTER to teach Chemistry up to Honours Standard (B.E.) in Secondary Day School and Evening Science Classes. An experienced teacher and good disciplinarian essential. Commencing Salary £150, with some £25-£30 for Evening Work. Apply, giving age, qualifications, experience, and copies of three testimonials, by January 30 to HEAD MASTER. The Advertiser would be glad to purchase in Parts, a few weeks after dates of issue, (1) "The Philosophical Magazine"; (2) "Science Abstracts." Also within six months of publication, bound or unbound volumes of "The Philosophical Transactions of the Royal Society." Please apply, stating prices asked, to "S.," NATURE Office. For Sale, "Journal of the Chemical Society," 10 years from 1894. Complete with indices.-G. S. NEWTH, Godstone, Mathematics ... J. 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. W. G. BIRT, B.A., B.Sc. (A. B. RENDLE, M.A., D.Sc. Botany F. E. FRITSCH, Ph.D., B.Sc. Zoology.. 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 FOR SALE. 30 moving coil ammeters and voltmeters. 6 moving coil reflecting and pointer galvanometers. 8 hot wire ammeters and voltmeters. 50 electromagnetic ammeters and voltmeters. 60 dynamos and motors, direct and alternating current. 40 ironclad regulating rheostats. 20 transformers and choking coils. 10 induction coils, 10-inch spark. 3 mercury jet breaks. Standard condensers, Wheatstone bridges, static machines, switches, cables, &c., by various makers, at low prices. G. BOWRON, 57 EDGWARE RD., LONDON, W 142 ST. JOHN STREET, LONDON, E.C. ORTHOCHROMATIC PHOTOGRAPHY. A SANGER-SHEPHERD Light Filter gives the Maximum of Orthochromatic effect with the Minimum of Exposure. To obtain Pictures true to nature with correct values of Light and Shade, Shadow Details and Cloud Effects, use a Sanger-Shepherd Light Filter. All sizes stocked-Circular and Square. Fittings and Cases |