now being issued in Twelve Monthly Parts, each Part containing Four Fine Half-Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 7/-; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s. TO SCIENCE LECTURERS. HUGHES' PHOTO ROTOSCOPE CINEMATOGRAPHS. THE MOST PERFECT. No Flickering. Superb Mechanism. Price £7 7 0. The Moto-Photo Camera for taking the Pictures. Illustrated Lists, 2d. See Mr. HUGHES' PATENT COMBINATION OPTICAL LANTERN, &c. Miniature Triple Lantern constructed for B. J. MALDEN, Esq.; great success. New Oxyhydrogen Microscope. Science Lanterns for Class Demonstration. Magnificent Results. Docwra Triple, Prize Medals, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN GUINNESS, &c. Patent Pamphengo Science Lanterns. The Universal Lantern 4-inch Condensers, 4-wick Lamp, Portrait Combination front Lenses, 18s. 6d. Marvellous value. Science Lecture Sets. Novelties. The Lantern Kaleidoscope. Cheapest Lantern Outfits in the World. Grandly Illustrated Catalogue, over 180 choice Engravings, 6d. ; Postage, 4d. Small Illustrated Catalogue, 100 pages, free, 5d. List of 60,000 Slides and 300 Lecture Sets, Science Subjects, Views, &c., 6d. ; Postage, 2d. Pamphlets Free. W. C. HUGHES, SPECIALIST, Brewster House, 82 Mortimer Road, Kingsland, N. NOTICE. PROOF COPIES, on India Paper, of the Photogravure Portrait of LORD RAYLEIGH (ordinary impressions of which were presented with "Nature" of August 18) can be obtained from the Publishers at 5s. each, or post free for 5s. 6d. A Complete List of the Portraits published in the Series of SCIENTIFIC WORTHIES will be sent to anyone making application for the same. OFFICE OF "NATURE," ST. MARTIN'S ST., LONDON, W.C. WATKINS & DONCASTER, NATURALISTS, AND MANUFACTURERS OF CABINETS AND APPARATUS FOR ENTOMOLOGY, BIRDS EGGS AND SKINS, AND ALL SPECIAL SHOW-ROOM FOR CABINETS. Our Catalogue (96 pp.) Post free on application. N.B.-For Excellence and Superiority of Cabinets and to Apparatus, references are permitted distinguished patrons, Museums, Colleges, &c. A LARGE STOCK OF INSECTS, BIRDS' EGGS AND SKINS. 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.) ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POLISHED DEAL BOXES. 25 Specimens, 5/6; 50 do., 10/6; 1oo do., 21/-; 200 do., 42/20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy. A large stock of Minerals, Rocks, Fossils and Microscopic Objects for THOMAS D. RUSSELL, 78 Newgate St., London, E.C. 180 ST. GEORGE STREET EAST. Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery, Netsukis China, Lacquers, Gongs, Shells, and other Curios. 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 1s. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM. 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, Alcyonium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus, Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone, Pectens Bugula, 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. NOTICE.-Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial Communications to the Editor. The telegraphic address of NATURE is "PHUSIS," LONDON. SUBSCRIPTIONS TO "NATURE." CHARGES FOR ADVERTISEMENTS. £ s. d. To ALL PLACES ABROAD: £ s. d. *Three Lines in Column 0 14 6 7.6 Half-yearly Quarterly Per Line after O 15 6 8 * The first line being in heavy type is charged for as Two Lines. Half a Page, or a Column 3 5 O o 18 6 Whole Page 6 6 0 Limited. Cheques and Money Orders payable to MACMILLAN & CO., O 2 6 | Quarter Page, or Half O O 9 a Column One Sixteenth Page, or Eighth Col. 10 One Eighth Page, or Quarter Column £ s. d. I 15 PHILIP HARRIS & CO.LTD. PHILIP HARRIS & CO. LTD LABORATORY FURNISHERS The number of Institutions in which we have fitted Laboratories is a record one. From among this number, we have selected one from each of the principal classes of Institution fitted, and give these herewith:-Skinner's School, Tunbridge Wells; St. Mark's College, Chelsea; High School for Girls, Lincoln; Technical School, Louth; County School, Wrexham ; Grammar School, Tamworth; The Oratory School, Edgbaston; Convent of the Sacred Heart, Seaforth. WE ARE PREPARED TO QUOTE TO CUSTOMERS' SPECIFICATIONS, OR SHOULD YOU ENTRUST THE DESIGNING AND FITTING OF YOUR LABORATORIES TO US, OUR LONG AND VARIED EXPERIENCE MAKES IT CERTAIN THAT "LIGHT," FLOOR SPACE," BENCH ACCOMMODATION," AND "CONTROL OF STUDENTS" WILL BE ARRANGED AND ECONOMISED, TO THE BEST POSSIBLE ADVANTAGE, AND WE ARE SURE THE QUALITY WILL GIVE EVERY SATISFACTION. 144-EDMUND ST. BIRMINGHAM AND. 179.G BRUNSWICK ST· DUBLIN SCHOTT & GEN. Glassworks, Jena (GERMANY). The Jena Glasses are, in the U.K., on sale with the following firms: Aberdeen. A. & J. SMITH, 23 and 25 St. & Co., Manchester. BAIRD & TATLOCK (London) F. E. BECKER & Co. (W. and A. GALLENKAMP & Co., Ltd., JOHN J. GRIFFIN & SONS, PHOSPHORESCENT POWDER S to Phosphoresce by Day or Ultra-Violet Light. In neat Ebonite and Brass Boxes with Mica Window. Price 3/6 each, or 18/6 set of six. NEW PATENT ELECTRIC FURNACES FOR Crucibles, Muffles, Combustion Analysis, Kjeldahl's Price List and full details on application. SOLE AGENTS FOR UNITED KINGDOM, A. GALLENKAMP & CO., Ltd., 19-21 SUN STREET, FINSBURY, LONDON, E.C. GLEW'S 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. 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 A. C. COSSOR, 54 Farringdon Road, E.C. F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900), ROCK-SECTIONS FOR THE MICROSCOPE. LESSONS IN LABORATORY OR BY CORRESPONDENCE. NATURE Of THURSDAY NEXT, DECEMBER 8, will contain the ITS PRICE WILL BE ONE SHILLING. 7 Advertisements intended for this number should reach BY the Publishers by Tuesday, December 6. HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN- OFFICE OF "NATURE," ST. MARTIN'S STREET, LONDON, W.C. LONDON HATTON WALL BECKER BECKER BECKER BECKER KER NOW READY. ILLUSTRATED CATALOGUE OF PHYSICAL APPARATUS, COVERING SOUND, LIGHT, HEAT, MAGNETISM, Over 600 Pages. Nearly 4,000 Illustrations. wwwww "NATURE" says: "The new illustrated catalogue of physical apparatus just issued by Messrs. F. E. Becker and Co. (Messrs. W. and J. George, Ltd.) is likely to prove indispensable in the physical laboratories of all our schools and colleges. It runs to 628 large pages, and is strongly bound in cloth. Full particulars only are provided, not respecting the apparatus required in elementary and advanced physical teaching, but also concerning that necessary to the physicist in his research work. All branches of physics are included, and the instruments throughout are explained by excellent illustrations and concise descriptions, and, what is of prime importance, the figure and its appropriate text are close together." "CHEMICAL NEWS" says: 'Messrs. F. E. Becker and Co. (W. and J. George, Ltd., successors) have just issued a new Illustrated and Descriptive Catalogue of Physical Apparatus, &c., manufactured by them. This is the largest and best English catalogue of its kind printed, and comprises some 680 pages and over 4,000 illustrations; herein will be found all the newest up to date apparatus with all the latest improvements as manufactured at their works, while all obsolete apparatus has been omitted. The whole catalogue is arranged in a very clear manner under a number of principal headings, such as Magnetism, Heat, Sound, Light, Mechanics, Electricity, Pneumatics, Meteorology, X-ray Apparatus, &c., and a good index is provided; in fact, everything possible has been done to make this as perfect a guide as possible to users of apparatus in the subjects touched upon.' “Messrs. F. E. Becker and Co. (W. and J. George, Ltd., Successors) have sent us a copy of their new list of apparatus in the various departments of Physics, including Sound, Light, Heat, Magnetism, Electricity, Mechanics, &c. This exhaustive catalogue consists of over 600 pages and some 4000 illustrations. One of its noteworthy features is that the requirements of science teaching in this country and its colonies are always kept in view, and the articles listed cover the latest developments in their subjects. The method adopted in the list itself, together with the completeness of the index, is such as to make reference to it simple and expeditious." "SCHOOL WORLD" says: "The science-master in every grade of school should possess a copy of the new catalogue of Messrs. George, for he will find here particulars as to the available apparatus in sound, light, heat, magnetism, electricity, mechanics, and other branches of physics, with information as to price and other necessary details. There is a profusion of welldrawn illustrations, which, together with the clearly expressed descriptions, will serve to explain to any buyer exactly what he is purchasing. This excellent catalogue will form a valuable addition to the reference library of any physical laboratory." BECKER BECKER BECKER BECKER LONDON |