ILLUSTRATED LIST ("A") OF SPECTROSCOPES AND ACCESSORIES GRATIS. ADAM HILGER, Ltd., 75a Camden Road, London, N.W. AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904. PETROGRAPHICAL MICROSCOPE. BAUSCH & LOMB'S New Perfected Model. This Instrument has been brought right up to date, and the Stand is of the improved Horseshoe form, with circular revolving stage and graduated scale in m/m at right angles, with special substage, fine adjustment, and diagonal Rack and Pinion movement. The fine adjustment has dust-proof collar, adjustment for Bertrand Lens by rack and pinion, with slits for quartz wedge, sliding prism box, Iris diaphragm between prism box and Bertrand Lens, with triple nose-piece and centring adjustment. AWARDED MEDALS WHEREVER EXHIBITED, including 9 at the great Paris Exposition of 1900. JAS. J. HICKS, 8, 9 & 10 HATTON GARDEN, LONDON, SCIENTIFIC INSTRUMENT MAKER TO THE WAR OFFICE, INDIA OFFICE, ADMIRALTY, &c. WHOLESALE MANUFACTURER OF Complete with polarising apparatus, large nickel prism Meteorological and Scientific Instruments in revolving mounting, with German silver graduated scale, including 1". ", and " objectives; 2", 1", and 1" hair-line eyepieces, in Mahogany cabinet, £36. WE HAVE MODIFICATIONS OF THIS INSTRUMENT FROM £21 17s. 6d., UPWARDS. We shall be pleased to show this instrument, together with our large collection of Student, Bacteriological, Metallurgical and Chemical Microscopes to interested clients. Sole Representatives of the BAUSCH & LOMB A. E. STALEY & CO., Contractors to H.M. Government, Universities, Hospitals, &c., 19 THAVIES INN, HOLBORN CIRCUS, LONDON, E.C., To whom all inquiries should be addressed. Write for Illustrated Microscopical Catalogue (84 pp.), 3 Stamps to cover postage. Also Lists of Microtomes, Centrifuges, Photographic Lenses, OF EVERY DESCRIPTION, INCLUDING STANDARD MERCURIAL BAROMETERS, STANDARD ANEROID BAROMETERS, STANDARD THERMOMETERS of every KIND, PUMPS BOTH FOR VACUUM & PRESSURE, Air Meters, Anemometers, Boiling Point Apparatus, Burettes, CATHETOMETERS, Clinometers, Drawing Instruments, Eudiometers, Gas, Steam and Water Gauges, Hydrometers, MICROSCOPES, Plane Tables, POLARIMETERS, Pyrometers, RANGE FINDERS, SEXTANTS, Spectroscopes, Sphygmometers, Sunshine Recorders, THEODOLITES, Wind Vanes, &c., &c., &c. Catalogues Post Free. (State which required.) ANY KIND OF SCIENTIFIC INSTRUMENT MADE TO ORDER. Prompt Attention to all Orders and Inquiries. Exceptional Terms to Colleges, Institutions, &c. Quotations submitted for Laboratory Outfits or Single Instruments. THERMOMETERS FOR STUDENT WORK A SPECIALITY. HARVEY & PEAK, BY APPOINTMENT TO THE ROYAL INSTITU. POST OFFICE BRIDGE SETS AND 56 CHARING CROSS ROAD, LONDON, w.c. MACMILLAN & CO.'S NEW BOOKS. THE LIFE & EXPERIENCES OF Sir Henry Roscoe, D.C.L., LL.D., F.R.S. Written by Himself. With Photogravure Portraits and other Illustrations. 8vo. 125. net. CHEMISTRY OF THE PROTEIDS. By GUSTAV MANN, M.D. (Edin.), B.Sc. (Oxon.), University Demonstrator of Physio logy, Oxford. Based on Professor Otto Cohnheim's "Chemie der Eiweisskörper." 8vo. 15s. net. NATURE." Its many excellences can be discovered by reading it and using it, and Dr. Mann is to be congratulated in having produced such a valuable addition to scientific literature." NEW WORK ON ASTRONOMY BY SIMON NEWCOMB. A COMPENDIUM OF SPHERICAL ASTRONOMY. With its Applica tions to the Deter mination and Reduction of Positions of the Fixed Stars. By SIMON NEWCOMB. 8vo. 12s. 6d. net. AN INTRODUCTION TO ASTRONOMY. By FOREST RAY MOULTON, Ph.D. THE BIOLOGY OF THE FROG. Crown 8vo. 6s. 6d. net. Illustrated. Crown 8vo. 5s. net. By SAMUEL J. HOLMES, Ph.D., Assistant Professor of Zoology in the University of Wisconsin. Illustrated. THE NEW EARTH. A Recital of the Triumphs of Modern Agriculture in America. Illustrations. Crown 8vo. 7s. 6d. net. HARWOOD, Author of "New Creations in Plant Life." By W. S. With many 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. onium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus, Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone, Pectens Bagula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c. For prices and more detailed lists apply to Biological Laboratory, Plymouth. THE DIRECTOR. WATKINS & DONCASTER, Naturalists and Manufacturers of CABINETS AND APPARATUS FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL SPECIAL SHOW-ROOM FOR CABINETS. N.B. For Excellence and Superiority of Cabinets and Apparatus, refer ences are permitted to distinguished patrons, Museums, Colleges, &c. A LARGE STOCK OF INSECTS, BIRDS' EGGS AND SKINS. SPECIALITY.-Objects for Nature Study, Drawing Classes, &c. Birds, Mammals, &c., Preserved and Mounted by First-class Workmen true to Nature. All Books and Publications on Natural History supplied. 36 STRAND, LONDON, W.C. (Five Doors from Charing Cross.) CATALOGUE (102 pp.) POST FREE. BOTANICAL MICROSCOPIC SLIDES FOR STUDENTS. Including Four Series, 50 Slides in each. Price £1 18. per Series; adapted for Board of Education and London University Examinations, Illustrating Mitosis, Leucoplasts, Thyloses, Root, Stem, and Flower Development, Anomalous Stems, Embryo-sac Structure, Pollen Tubes, Botrydium, Edogonium, Coleochaete, Chara, Sexual Organs and Cystocarps in the Rhodophyceae; Peronospora, Saccharomyces, Claviceps, Puccinia, Anthoceros, Pilularia, Marsilea, Isoetes, Psilotum, Selaginella, Pinus, &c. Catalogue Post Free.. A. PENISTON, 5 MONTPELIER TERRACE, LEEDS. Minerals, Rocks, Fossils, Metallic Ores, Rough Precious Stones, &c. A Large Assortment from all parts of the world always on view, and at all prices. Inspection invited. Crude Mineral for Chemistry Students and Technical Schools. Single Crystals and Teaching Specimens in Great Variety. RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington, London, S. W. SAVAGE CURIOSITIES. Stock of over 10,000 Specimens of Weapons, Implements, Ornaments, Collections and Single Specimens of MINERALS, ROCKS, FOSSILS. 25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/-. 20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. In Polished Deal Boxes. Inspection invited of a large stock of Minerals, Rocks, Fossils, and THOMAS D. RUSSELL, 78 Newgate St., London, E.C. s. d. I 10 6 0 15 6 8 One Sixteenth Page, or Eighth Col. 10 O 6 | Quarter Page, or Half a Column 1 15 Half a Page, or a Column 3 5 O Whole Page 660 The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN & CO., Limited. THE CAIFFE AUTO-MOTOR NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR. The interruption cuts the current both for motor and coil. In other words, motor and interrupter are electrically and mechanically linked together. Runs 500 working hours without requiring attention. See NATURE, July 20, 1905, page 277. The leading experts have reported in terms of the highest praise upon this Break after continuous use (vide Testimonialsy Price, including box and packing, £4:6: 6 THE MEDICAL SUPPLY ASSOCIATION, 228 Gray's Inn Road, London, W.C. Descriptive Circular upon application. WATSON'S MICROSCOPES. 23 DIFFERENT MODELS to select from, suited for every class of research. From £2: 2: 6 upwards. Watson's Microscopes are designed to afford the utmost convenience and comfort combined with absolute accuracy for scientific work. They are up-to-date and of highest quality. For full particulars see WATSON'S 1906 CATALOGUE OF MICROSCOPES (188 pages) post free on application. WATSON'S INSTRUMENTS MAY BE PURCHASED BY PROGRESSIVE PAYMENTS. W. WATSON & SONS, Opticians to H.M. Government, (Established 1837) 313 HIGH HOLBORN, LONDON, W.C. BRANCHES-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM. SPECTRUM TUBES. FLUORESCENT COMPOUNDS. Awarded Gold and Silver Medals, St. Louis Exhibition, 1904. Telephone No. 10547 Central. DALLMEYER'S NEW TELEPHOTO LENS. Can be used in front of any THE ADON (REGISTERED) small lens without disturbing plates or films which may be in position. Can be used alone for higher magnification or larger plates. An excellent lens for all artistic photography. Mounted in Aluminium. Measures 3ins. long, 1ins. PRICE, including Solid Leather J. H. DALLMEYER, LTD., 25 Newman St., London, W. MAKERS OF THE CELEBRATED DALLMEYER LENSES. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILies |