« PrejšnjaNaprej »
Academy of Sciences, October 16.-M. Troost in the chair. On the absolute desiccation of vegetable products: L. Maquenne. It is commonly assumed that when a substance has been heated in an air oven at 100° C. to 120° C. until its weight becomes constant, all the moisture has been driven off. The author shows that this is not the case for substances such as starch and flour. For complete drying, either a current of well dried gas must be passed over the starch at about 120° C., or it must be sealed up in a vacuum with a dehydrating agent for a long period.-Presentation of the twelfth volume of the Mémorial du Dépôt général de la Guerre": Bouquet de la Grye. This volume includes the measurements of the new meridian of France from the bases of Paris, Perpignan, and Cassel. Attention is directed to the accuracy of the results obtained.-Preliminary note on the observation of the total solar eclipse of August 30 made at Guelma MM. Bourget and Montangerand. Fifteen photographs were obtained during totality, different coloured screens being interposed. The plates are all good, and show excellent images of the corona and protuberances. -Observations on the total eclipse of the sun of August 30: J. Comas Solá. The observations, which were made at Vinaroz, included three photographs of the corona and of the spectra of the chromosphere.-On functions having a finite number of branches: Georges Rémoundos. On the calculation of an arch in masonry: M. Auric.-On a phenomenon of cooling observed in silver wires plunged into water and through which electric currents are passing: E. Rogovsky. It is shown that the resistance of the wire depends on the magnitude of the current passing through it, this effect being due to the fact that all parts of the wire are not, under these conditions, at the same temperature. It is necessary, to obtain exact values of the resistance of wires in a liquid at the temperature of this liquid, to extrapolate from a series of observations made with different intensities of current.-On the forms of lightning conductors: G. M. Stanoïévitch. The basic character of pyranic oxygen. Halogen compounds of dinaphthopyryl with metals and metalloids: R. Fosse and L. Lesage. C10H6 The radical dinaphthopyryl, -CH CO, although not
C10H6 containing nitrogen, forms a large number of double salts, examples of which with platinum, lead, iron, zinc, tin, bismuth, arsenic, and antimony are given in the present note. On the development of amylase during the germination of seeds: Jean Effront. The sugar-forming and liquefying powers of malt do not develop at the same rate during germination, the former being the more rapid and reaching a maximum, whilst the latter steadily increases with the time of germination. The measurement of the mechanical work obtainable from Limousin cattle: M. Ringelmann.-On a new flagellated parasite of Bombyx mori (Herpetomonas bombycis): C. Levaditi.
NEW SOUTH WALES.
Royal Society, September 6.—Mr. H. A. Lenehan, president, in the chair.-Reinforced concrete, paper iii. Prof. W. H. Warren. The following matters were dealt with :— (a) The adhesion of cement mortar and concrete to steel. (b) The experimental determination of the neutral axis in a plain concrete, and also in a reinforced concrete beam, and the curves of strain for loads increasing from zero to the load producing fracture; the determination of the true form of the stress curve from the actual strain curve in a plain and in a reinforced concrete beam. (c) The safe working stresses and the fundamental equations recommended for the design of reinforced concrete structure.The occurrence of inclusions of basic plutonic rocks in a dyke near Kiama: C. A. Sussmilch.
ENTOMOLOGICAL SOCIETY, at 8.
SOCIETY OF PUBLIC ANALYSTS, at 8.-(1) A Rapid Method for the Deter mination of Tin in Copper-Tin Alloy; (2) Water from the Simplon Tunnel: A. G. Levy.-Notes on (1) Dika Oil; (2) Surin Fat: J. Lewkowitsch.-The Determination of Oxygen in Copper: L. Archburi. THURSDAY, NOVEMBER 2.
CHEMICAL SOCIETY, at 8.30.-Solution and Pseudo-solution, part is, Some of the Arsenious Properties of Arsenious Sulphide and Ferk Hydrate: E. Linder and H. Picton.-The Molecular Conductivity of Water: P. Blackman.-The Stereoisomerism of Substituted Ammonium Compounds: H. O. Jones.-The Influence of very Strong Electro magnetic Fields on the Spark Spectra of Ruthenium, Rhodium, and Palladium; J. E. Purvis,-Note on the Fluorides of Selenium and Tellurium: E. B. R. Prideaux.-The Constitution of Glutaconic Acid: JF. Thorpe.-Some Alkyl Derivatives of Glutaconic Acid and of a:& Diexypyridine: H. Baron and J. F. Thorpe.-Note on the Formation of B-Methylglutaconic Acid and of a8-Dimethylglutaconic Acid: F. V. Darbishire and J. F. Thorpe.
LINNEAN SOCIETY, at 8.-Plant Ecology, interpreted by Direct Response to the Conditions of Life: Rev. G. Henslow.
RÖNTGEN SOCIETY, at 8.15.-The Ruhmkorff Coil: Prof. WertheimSalomonson.
CIVIL AND MECHANICAL ENGINEERS' SOCIETY, at 8.-Sea Defences: Baron H. T. H. Siccama,
Scientific Research in Medicine. By Dr. George Nuttall, F.R.S..
The Mechanics of the Ascent of Sap in Trees. By Prof. J. Larmor, F.R.S.
On the Origin of Eoliths
Our Astronomical Column:
Experiments with the Langley Aerodrome. (Illus trated.) By Dr. S. P. Langley
University and Educational Intelligence
Societies and Academies
Diary of Societies. .
"No. 2" SPECTROMETER.
(Diameter of Circle = 8")
The Rotation of the Prism Table and of the Telescope are both read by Vernier on a Platinoid Circle to 30 seconds.
ADAM HILGER, Ltd., 75a Camden Road, London, N.W.
Telegraphic Address:-"Sphericity, London."
AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.
ILLUSTRATED LIST ("A") OF SPECTROSCOPES AND SPECTROSCOPIC ACCESSORIES CRATIS ON APPLICATION.
AWARDED MEDALS WHEREVER EXHIBITED, including 9 at the great Paris Exposition of 1900.
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.
FREDK. JACKSON & Co.
(Late MOTTERSHEAD & CO.),
14 CROSS STREET, MANCHESTER.
Goods Entrance: 10 Half-Moon Street.
Importers, Manufacturers, and Dealers in
FINE CHEMICALS, VOLUMETRIC SOLUTIONS,
61 STRAND, and 4 ROYAL EXCHANGE, LONDON.
(BY APPOINTMENT TO THE ROYAL INSTITUTION OF GREAT BRITAIN.)
Makers of the new Apparatus illustrating Wave Motion, designed and used by Dr. J. A. FLEMING in the Christmas Lectures at the Royal Institution.
READING MICROSCOPES, RESISTANCE COILS, &c.
56 CHARING CROSS ROAD, LONDON, W.C. SPECIAL TERMS TO COLLEGES, SCHOOLS. INSTITUTES, &c.
MACMILLAN & CO.'S LIST.
SECOND AND REVISED EDITION NOW READY.
HANDBOOK OF METALLURGY.
By Dr. CARL SCHNABEL, Professor of Metallurgy.
Translated by Professor H. LOUIS, M.A., A. R.S.M., F.I.C., &c. Illustrated. Second Edition. Vol. I.-Copper, Lead, Silver, Gold. Medium 8vo. 25s. net.
THE PREVENTION OF SENILITY AND A SANITARY OUTLOOK.
By Sir JAMES CRICHTON-BROWNE, M.D., LL.D., F.R.S. Crown 8vo. 2s. 6d. net.
SCIENTIFIC FACT AND METAPHYSICAL REALITY.
By ROBERT BRANDON ARNOLD. 8vo. IOS. net.
NATURE.-"A notable performance. In originality of conception, vigour and clearness of statement, width of outlook and fairness to all the aspects of experience, it would be with difficulty surpassed."
SEVENTH EDITION. REVISED AND ENLARGED.
The Elementary Part of
A TREATISE ON THE DYNAMICS OF A SYSTEM OF RIGID BODIES.
Being Part I. of a Treatise on the whole Subject.
By EDWARD JOHN ROUTH, Sc. D., LL.D., F.R.S., &c. With numerous Examples, Svo. 145.
NEW BOOK BY SIR OLIVER LODGE.
EASY MATHEMATICS: Chiefly Arithmetic.
Being a Collection of Hints to Teachers, Parents, self-taught Students, and Adults, and containing a
WATKINS & DONCASTER,
Naturalists and Manufacturers of
CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
SPECIAL SHOW-ROOM FOR CABINETS.
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.
Collections and Single Specimens of
MINERALS, ROCKS, FOSSILS.
25 Specimens, 5/6; 50 do., 10/6; 100 do.. 21/-; 2co do, 42/-. 20 Coal Measure Rocks and Fossils, 12/6; do, larger, 15/-. In Polished Deal B xes.
Inspection invited of a large stock of Minerals, Rocks, Fossils, ana 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.
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. ubscription in advance, either Monthly, 7/-; Quarterly, 21/-, or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.
LIVING SPECIMENS FOR
Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Štephanoceros, Melicerta, and many other specimens of Pond Life. Price 15. 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; Lineu, Amphiporus, Nereis, Aphrodite, Aren.cola, 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.
and business letters for NATURE should be addressed to the Publishers; Editorial Communications to the Editor. The telegraphic address of NATURE is "PHUSIS," LONDON.
Replaces Coils, Interrupters, and Wimshurst
Producing, perfectly regulating, and exactly measuring
X-RAYS, HIGH-FREQUENCY CURRENTS, AND
Silent in Working, Simple in Manipulation. This apparatus has been already installed by many of the chief workers in Electro-Therapeutic in France and England, and is giving the very best results (vide testimonials).
Replaces large Induction Coils in Laboratory and Research Work requiring
THE MEDICAL SUPPLY ASSOCIATION,
CROSSLEY'S GAS ENGINES
THE CORRESPONDENTS' CAMERA. GRAND.
Originally made for the use of Newspaper Men in South Africa, and since used all over the World.
THIS Camera has been designed for the use of correspondents, artists, and other travellers who, while requiring a Camera possessing the greatest stability, cannot spare the space for a regular field camera in addition to a hand camera. It is made of the best mahogany, carefully finished and covered with hard morocco leather, or polished in natural colour or ebonised at the same price. It is admirably adapted for Telephoto work. Owing to the use of wood instead of metal, wherever possible, this camera is lighter than many of less substantial make. EACH SIZE PERMITS OF THE USE OF THE SINGLE COMPONENTS OF A STIGMATIC OR OTHER CONVERTIBLE LENS. PRICE, including 3 Double Slides, but J 4 by 31. 61 by 41. £5 15s. 6d. £7 15s. Od.
without Lens or Shutter.
5 by 4.
J. H. DALLMEYER, Ltd., 25 NEWMAN ST., OXFORD ST., LONDON, W.
MAKERS OF THE CELEBRATED DALLMEYER LENSES.
Printed by RICHARD LAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill. Queen Victoria Street, in the city of Lon on, and published by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COM: ANY, & Filth Avenue, New York.-IHURSDAY, October 25 x 5