NEW MODEL SPECTROPHOTOMETER For accurate quantitative measurements of light absorption. Can be seen by appointment at the following address:ADAM HILGER, Ltd., 75a Camden Road, London, N.W. AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904. ILLUSTRATED LIST ("A") OF SPECTROSCOPES AND SPECTROSCOPIC ACCESSORIES KAHLBAUM'S AWARDED MEDALS WHEREVER EXHIBITED, including 9 at the great Paris Exposition of 1900. JAS. J. HICKS. TO THE 8, 9 & 10 HATTON GARDEN, LONDON, OF CHEMICALS. Meteorological and Scientific Instruments OF EVERY DESCRIPTION, INCLUDING STANDARD MERCURIAL BAROMETERS, Air Meters, Anemometers, Boiling Point Apparatus, Catalogues Post Free. (State which required.) 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 MACMILLAN & CO.'S BOOKS FOR STUDENTS OF ZOOLOGY. EDITED BY S. F. HARMER, Sc. D., F.R.S., AND A. E. SHIPLEY, M.A., F.R.S. WORMS, LEECHES, &c. VOLUME II. Flatworms. By F. W. GAMBLE, M.Sc. Nemertines. By DARD, M.A., F.R.S. Gephyrea, &c. By A. E. SHELLS. VOLUME III. Molluscs and Brachiopods. By the Rev. A. H. Cooke, A. E. SHIPLEY, M. A., F. R.S., and F. R. C. REED, M.A. INSECTS & CENTIPEDES. VOLUME V. Peripatus. By ADAM SEDGWICK, M.A. F.R.S. Myria. pods. By F. G. SINCLAIR, M.A. Insects. Part I. By DAVID SHARP, M.A., F.R.S. Volume I., dealing with PROTOZOA (including Sea and Volume IV., dealing with SPIDERS, SCORPIONS, and ZOOLOGY. By Professor T. J. PARKER, D.Sc., A MANUAL OF ZOOLOGY. By A TEXT-BOOK OF ZOOLOGY. By 8vo. PRICE 175. NET EACH. INSECTS. PART II. Hymenoptera continued (Tubulifera and Aculeata), Coleop tera, Strepsiptera, Lepidoptera, Diptera, Aphanip. tera, Thysanoptera, Hemiptera, Anoplura. By DAVID SHARP, M. A., F.R.S. By FRANK EVERS BEDDARD, M.A. Oxon., F.K.S., ViceSecretary and Prosector of the Zoological Society of London. Anemones, Jelly Fish, Star Fish, &c.), will be ready shortly, CRUSTACEA, is in the Press. An INTRODUCTION to the OSTE- A TEXT-BOOK of COMPARATIVE ELEMENTARY BIOLOGY. By T. H. The NATURAL HISTORY of the HUXLEY, F. R.S., and H. N. MARTIN, F.R.S. New Edition. Revised and extended by the late G. B. HoWES and D. H. SCOTT. Crown 8vo. 10s. 6d. THE ORIGIN AND METAMORPHOSES of INSECTS. By LORD AVEBURY, F. R.S. With Illustrations. Crown 8vo. 35. 6d. [Nature Series. MARKETABLE MARINE FISHES of the BRITISH ISLANDS. By J. T. CUNNINGHAM, M.A. With Preface by E. RAY LANKESTER, F.R.S. Illustrated. Medium 8vo. 7s. 6d. net. NATURAL HISTORY of AQUATIC INSECTS. By Professor L. C. MIALL, F.R.S. Illustrated. Second Impression. Globe 8vo. 35. бa. Current Accounts. 2% Interest allowed on minimum Southampton Buildings, High Holborn, W.C. 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 Microscopic Objects. Specimens sent on approval. Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes, Models of Crystals, and other Apparatus for Geologists, &c. NEW CATALOGUES POST FREE. THOMAS D. RUSSELL, 78 Newgate St., London, E.C. MICROSCOPICAL PETROGRAPHY. Gentlemen interested in the above study are invited to send to JAMES R. GREGORY & CO., 1 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 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. FREDK. JACKSON & Co. (Late MOTTERSHEAD & CO.), 14 CROSS STREET, MANCHESTER. Goods Entrance: 10 Half-Moon Street. 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, references 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.) New Catalogue (102 pp.) just issued, post free. LANTERN SLIDES of Scientific Subjects, from 6/- per dozen. Also Hand Painted from 1/3 to 5/- each. Slides from Prints, Drawings, Photographs, &c., a Speciality. PHOTOMICROGRAPHS. Storage Cabinets for Lantern Slides to hold 400, 10/6; 600, 14/6; 1200, 25/6. See List. MICROSCOPICAL SLIDES, Botanical, Zoological, &c., from 6s. per dozen. MARINE ORGANISMS, Hydroza, Crustacea, Annelida, &c.. polyps extended, without pressure, dark ground or opaque, very beautiful. List. Exhibition Groups of Diatoms, Petrological, &c. Dispersal of Mr. HORNELL'S collection of Slides, Marine and Botanical, from 5d. each. MICROSCOPES, &c. SECOND-HAND, large and ever-changing stock. Van Heurck, new, others including Objectives, Condensers, Polariscopes, &c., by Watson, Ross, Powell and Lealand, Beck, Pillischer, Reichert, Leitz, &c. Prismatic Binoculars, Lantern Slides, Mounting Materials. Lists. Mr. HERBERT CLARKE, 104 LEADENHALL STREET, LONDON. Tel.:-1316 CENTRAL. 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. LABORATORY FURNISHERS, MARINE BIOLOGICAL ASSOCIATION Importers, Manufacturers, and Dealers in CHEMICAL AND PHYSICAL APPARATUS Of every Description. FINE CHEMICALS, VOLUMETRIC SOLUTIONS, Telegraphic Address-"APPARATUS, MANCHESTER." Telephone Number-2238. 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 SUBSCRIPTIONS TO "NATURE." £ s. d. TO ALL PLACES ABROAD: PHUSIS," LONDON. Ls. d. 6 O 15 6 O 8 Column One Sixteenth Page, or Eighth Col. 10 O £ s. d Quarter Page, or Half a Column Half a Page, or a Columa 35 Whole Page . 66 O 1 15 O The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN & CO., Limited. W. WATSON & SONS, 313 High Holborn, Established 1837. Branches: 16 FORREST ROAD, EDINBURGH; 2 EASY ROW, BIRMINGHAM. THE NEW NATURALISTS' CAMERA. 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 MACMILLA AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, September 28 rs Library No. 1875, VOL. 72] " Of Nature trusts the mind which builds for aye. -WORDSWORTH. THURSDAY, OCTOBER 5, 1905 [PRICE 15 CENTS [All Rights are Reserved. VERLAG VON GUSTAV FISCHER IN JENA. Soeben erschienen : 1905. Biochemie der Pflanzen. Von Dr. phil. et med. FRIEDRICH F. Zirkel und R. Reinisch, Petrographie. I. Untersuch- Zur Erkenntnis der Kolloide. Ueber irreversible Hydrosole JOHN J. GRIFFIN & SONS, Ltd., 20-26 SARDINIA ST., LINCOLN'S INN FIELDS, 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 Further Particulars and Prices of this and other long Catalogue of Part II., free on application. |