TO SCIENCE LECTURERS. See Mr. HUGHES'S PATENT COMBINATION OPTICAL LAN TERN, used by late W. LANT CARPENTER, Esq., Prof. FORBES. New Triple constructed for B. J. MALDEN, Esq., this season. New Oxyhydro. gen Microscope. Grand Results. Docwra Triple, Prize Medal, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN GUINNESS, Madame ADELINA PATTI, &c. Patent Pamphagos Lantern Science Lecture Sets. Novelties Cheapest and Best. Elaborately Illus trated Catalogue, 300 Pages, 1s.; Postage, 5d. Smaller do., 6d. Pamphlets Free.-HUGHES, Specialist, Brewster House, Mortimer Road, Kingsland, N. Sale by Auction. MONDAY NEXT, FEBRUARY 29. THE FORBES COLLECTION OF STUFFED AND MOUNTED On view the Saturday prior, from 10 till 5, and Morning of Sale, and LIVING SPECIMENS FOR THE MICROSCOPE. Attractive Specimens of Pond-life for Exhibition purposes, such as Volvor globator, Epistylis grandis, Hydraviridis, Melicerta tubicolaria, Lophopus crystallinus, Phantom " larva (Corethra), Water-fleas, &c.; Amba Actinosphærium, Vorticella, Hydra, &c., for the Student of Biology. 15. per Tube each, Post-free. THOMAS E. BOLTON (Son and Successor of the late THOMAS BOLTON, F. R.M.S., to whom was awarded a Gold Medal at the Fisheries Exhibition, 1883), FARLEY ROAD, MALVERN. COLLECTIONS OF MINERALS, ROCKS, OR FOSSILS, For the Use of Students, Science Teachers, Prospectors, &c., and to illustrate the leading Text-books, in Boxes, with Trays. 50 Specimens, 10s. 6d. ; 100 do., 21s.; 200 do., 425. New Price List of Minerals, Rocks, and Stratigraphical Series of Fossils ROCK SECTIONS for the MICROSCOPE from 1s. 6d. each, Post Free. CATALOGUES GRATIS. Post Free. CABINETS, GLASS-CAPPED BOXES, TRAYS, HAMMERS, &c. always in Stock. THOMAS D. RUSSELL, 78 NEWGATE STREET, LONDON, E.C. F. H. BUTLER, M.A. Oxon., Assoc.R.S. Mines, NATURAL HISTORY AGENCY, 158 BROMPTON ROAD, LONDON,' Dealer in Rocks, Minerals, Fossils, and other Obiects of Scientific Interést. Mr. BUTLER has now on view a large and varied series of example of the Volcanic Rocks of PANTELLERIA, Italy (hitherto but little known to British collectors), obtained by him during his recent visit to that island. Micro-sections of these, including products of the submarine erup or in October last, are in course of preparation. Characteristic sets or single specimens can be furnished on application. The collection of rocks formed by Mr. Butler in Vulcano, Lipari, Salina, and the Vesuvian area is now also on view. Among the last additions to stock are Micro-sections of the lately-described Riebeckite rock from Mynydd Mawr. JAMES R. GREGORY, MINERALOGIST AND GEOLOGIST. SPECIAL AND TYPICAL COLLECTIONS As supplied to the Science and Art Department, South Kensington. NEW LISTS NOW READY, And may be had Post free on application at the Repository and Museum, 88 CHARLOTTE STREET, FITZROY SQUARE, LONDON. 6 TRANSIT INSTRUMENTS. CLARK'S PATENT TRANSIT INSTRUMENTS may be obtained as usual. J. SINEL, Biological Laboratory, JERSEY. | A. J. FROST, II Victoria Street, Westminster. Price, £9 17s. 6d. WILLIAM WESLEY 28 ESSEX STREET, STRAND, LONDON, & SON, HAVE ALWAYS ON HAND A LARGE STOCK OF ENGLISH AND FOREIGN BOOKS NATURAL HISTORY AND SCIENCE. It differs from others NEW POLARIZING PRISM. СНЕАР SCHOOL APPARATUS HARVEY & PEAK, 56 CHARING CROSS ROAD, W.C. PERKEN, SON, & RAYMENT, Each Magic Lantern is efficient for exhibitions. The Lens gives crisp definition, being a superior Achromatic Photographic Combination (large diameter back lens), with rack and pinion. It is fitted to a telescopic lengthening tube, so gaining in reased focal accommodation. The Condenser is composed of two plano-convex lenses of 4 inches diameter. The Refulgent Lamp has 3 wicks (or 4 wicks 25. extra) yielding a brilliantly-illuminated picture. Each is complete in Box. BOOK ON THE MAGIC LANTERN: ITS CONSTRUCTION AND USE. "OPTIMUS" PROJECTOR, FOR SKETCHING. Any photograph or sketch inserted in the stage is projected on to a sheet of canvas or paper placed below, so that an enlarged or reduced sketch may Complete, with Oil Lamp or Gas Jet, Contains Complete Instructions (Cloth Covers), Price 6d. Perforated Russian LANTERN PHOTOGRAPHS, 82 125. per doz. PLAIN, 18s. 6d. per COLOURED. Iron Body, Brass Sliding Mahogany outside Body, Tubes, 2 Panelled Door, Brass doz. CATALOGUE POST FREE. Die Käfer von Mitteleuropa. LIFE AND WORKS OF Die Käfer der österreichisch-ungarischen CHARLES DARWIN. Monarchie, Deutschlands, der Schweiz sowie des französischen und italienischen Alpen gebietes. Bearbeitet von LUDWIG GANGLBAUER, Mit 54 Textfiguren in Holzschnitt. Umfang 35 Bogen gr. Lexikon-8°. Preis: Mk. 20. THE VOYAGE OF H.M.S." BEAGLE," ORIGIN OF SPECIES BY MEANS OF VARIATION OF ANIMALS AND PLANTS UNDER DOMESTICATION. Illustrations. 2 Vols., 155. DESCENT OF MAN, AND SELECTION IN RELATION TO SEX. Illustrations. 2 Vols., 155. Popular Edition, 7s. 6d. EXPRESSION OF THE EMOTIONS IN Das Werk wird sechs Bände im Umfange von je 30-40 Bogen bilden und seiner Aufgabe als systematisches und faunistisches Handbuch gerecht werden. Der erste Band, erschien 1891, behandelt die Familienreihe Caraboidea (Adephaga im weiteren Sinne), der zweite Band, erscheint 1892, die Familienreihe Staphylinoidea (Necrophaga im weiteren Sinne), der dritte, 1893, die Clavicornia und Lamellicornia, der vierte, 1894, die Serricornia (im Sinne von Leconte und Horn) und Heteromera, der fünfte, 1895, die Rhynchophora, der sechste, 1896, die Phytophaga (im Sinne von Leconte und Horn). Schlusse des sechsten Bandes wird eine vergleichende Morpho- MOVEMENTS AND HABITS OF CLIMBlogie der Coleopteren gegeben. Am The Solar Revolution-The Relation to Motion-The Origin of Force-The Astronomical Basis-The Theory of Motion-The Repetition of Theory. CHAPMAN & HALL, LTD., London. PALEONTOGRAPHICAL SOCIETY. The Volume of the Palæontographical Society for the Year 1891 is now ready, containing Part 1, No. V., of Jurassic Gasteropoda, by Mr. W. H. HUDLESTON, with Four Plates; Part VI. of Inferior Oolite Ammonites, by Mr. S. S. BUCKMAN, with Twelve Plates; and Part VI., Vol. I., and Part I., Vol. II., of Devonian Fauna, by the Rev. G. F. WHIDBORNE, with Twelve Plates. The Annual Subscription is One Guinea. Information with regard to Membership and back Volumes can be obtained on applica. tion to the Hon. Sec.. Rev. Prof. THOS. WILTSHIRE, 25 Granville Park, Lewisham, London, S. E. Now Ready, Price 5s. THE JOURNAL OF THE ANTHROPOLOGICAL INSTITUTE OF GREAT BRITAIN AND IRELAND, Vol. XXI., Part 3, February 1892, Contains Papers by the Rev. James Sibree; Prof. Prestwich, F.R.S.; B. London: TRÜBNER & CO., Charing Cross Road. DIARY OF SOCIETIES. LONDON. THURSDAY, FEBRUARY 25. ROYAL SOCIETY, at 4.30.-On the Organization of the Fossil Plants of the Coal-measures, Part XIX.: Prof. W. C. Williamson, F.R.S.-On Biologic Regions and Tabulation Areas: C. B. Clarke, F.R.S.-Observations on the Structure, Relations, Progressive Development, and Growth of the Electric Organ of the Skate: Prof. Ewart. INSTITUTION OF ELECTRICAL ENGINEERS, at 8.-Some Experimental Investigations of Alternate Currents: Alexander Siemens.-On the Specification of Insulated Conductors for Electric Lighting and other Purposes: W. H. Preece, F. R.S. (Discussion.) ROYAL INSTITUTION,_at 3.-Some Recent Biological Discoveries: Prof. E. Ray Lankester, F.R.S. LONDON INSTITUTION, at 6.-Experimental Meteorology (Illustrated): Shelford Bidwell, F.R.S. CAMERA CLUB, at 6.-Annual Meeting.-At 8.-Lantern Exhibition. FRIDAY, FEBRUARY 26. PHYSICAL SOCIETY, at 5.-On Modes of Representing Electromotive Forces and Currents in Diagrams: Prof. S. P. Thompson, F.R. S.-On the Flexure of Long Pillars under their own Weight: Prof. Maurice FitzGerald.-On Choking Coils: Prof. J. Perry, F.R.S. INSTITUTION OF CIVIL ENGINEERS, at 7.30.-The Construction and Efficiency of Locomotive Boilers: G. H. Sheffield. ROVAL INSTITUTION, at 9.-Optical Projection; Sir David Salomons, Bart. SATURDAY, FEBRUARY 27. ROYAL BOTANIC SOCIETY, at 3.45. SUNDAY, FEBRUARY 28. SUNDAY LECTURE SOCIETY, at 4-The Natural History and Mental and Moral Character of the Dog (with Oxy-hydrogen Lantern Illustrations): Frank Kerslake. (This lecture was written by the late Mr. Arthur Nicols.) MONDAY, FEBRUARY 29. LONDON INSTITUTION, at 5.-The Saga of Hamlet: Israel Gollancz. TUESDAY, MARCH 1. ZOOLOGICAL SOCIETY, at 8. 30.-On Stridulation in certain Lepidoptera, and the Distortion of the Hind Wings in the Males of certain Ommatophorinæ : G. F. Hampson.-On the Retention of Functional Gills in Young Frogs (Rana temporaria), with Remarks on the Protrusion of the Fore Limbs: Prof. W. N. Parker.-A Contribution to the Classification of Ophiuroids, with Descriptions of some New and Little-known Forms: Prof. F. Jeffrey Bell.-Observations on an Earthworm possessed of Seven Pairs of Ovaries: M. F. Woodward. INSTITUTION OF CIVIL ENGINEERS, at 8.-Monthly Ballot for Members.The Bishop Rock Lighthouses: W. T. Douglass.-The Illumination by Gas of Tory Island Lighthouse, County Donegal: David C. Salmond. (Discussion.) ROYAL INSTITUTION, at 3.-The Brain: Prof. Victor Horsley, F.R.S. THURSDAY, MARCH 3. ROYAL SOCIETY, at 4.30.-The following papers will probably be read :Dynamo-electric Machinery: Dr. Hopkinson, F.R.S., and E. Wilson,On the Clark Cell as a Standard of Electromotive Force: R. T. Glazebrook, F.R.S., and S. Skinner.-Certain Correlated Variations in Crangon vulgaris Prof. Weldon, F.R.S.-An Experimental Investigation of the Nerve Roots which enter into the Formation of the Brachial Plexus of the Dog: Dr. J. S. Risien Russell. LINNEAN SOCIETY, at 8.-Variations in the Internal Anatomy of the Gamasina: A. D. Michael.-On Vitality of Spores in Bacillus : Állan Swan. CHEMICAL SOCIETY, at 8.-A Rule for determining whether a given Benzene Mono-derivative shall give a Meta-di-derivative or a Mixture of Ortho- and Para-di-derivatives: Prof. Crum Brown and Dr. Gibson.The Relative Orienting Effect of Chlorine and Bromine: Dr. H. E. Armstrong and Mr. Briggs.-Contributions to our Knowledge of the Aconite Alkaloids; Part II., The Alkaloids of True Aconitum Napellus : Prof. Dunstan and Mr. Murray. Part III.. The Properties of Aconine; Conversion of Aconine into Aconitine : Prof. Dunstan and Dr. Passmore.Note on the Origin of the Luminosity of Coal-Gas Flames: William Foster. ROYAL INSTITUTION, at 3.-The Progress of Romance in the Middle Ages: Prof. W. P. Ker. LONDON INSTITUTION, at 7.-Orchestral Music in the Sixteenth Century (Illustrated): Dr. A. C. Mackenzie. Mathematical Instrument Manufacturer to H.M. Government, Council o India, Science and Art Department, Admiralty, &c. Mathematical, Drawing, and Surveying Instruments of every description, Of the Highest Quality and Finish, at the most Moderate Prices. Illustrated Price List Post Free. W. F. S. obtained the only Medal in the Great Exhibition of 1862 for Excellence of Construction of Mathematical Instruments, and the only GOLD MEDAL in the International Inventions Exhibition 1885 for Mathematical Work. Silver Medal, Architects' Exhibition, 1886. Address:-GREAT TURNSTILE, HOLBORN, LONDON, W.C. NO BELLADONNA NEEDED. FOURNET'S REFRACTOMETER. OCULIST'S APPARATUS (PATENT) SILVER MEDAL, PARIS, 1889. See "ENGINEERING," July 18, 1890. CURATIVE SPECTACLES FOR UNEASY SIGHTS. MR. A. FOURNET (The Inventor), 18 BENTINCK STREET, WELBECK STREET, W. (Hours 11 till 7.) Consultation Fee, 5s. Spectacles, Steel Frames, from 7s. 6d. Morning Post:-"Is bad sight on the increase?' is answered by A Fournet with much common sense." Homeopathic Review:-"If you need to see better, yet shrink from glasses, read A. Fournet's 'Philosophy of Sight."" (15 Stamps, from the Author.) MOIGNO.-Leçons de Calcul Différentiel et de Calcul Intégral. 2 Vols., Half-Calf. 1840-44. 185. LEGENDRE.-Elements of Geometry and Trigonometry. Edited by BREWSTER. 1824. 98. 1721. 7s. 6d. NEWTON.-Optics. Third Edition. Calf. Just Published, No. 512 (FEBRUARY 21) of Sotheran's Price Current of Literature. Containing numerous good books in many Branches of Literature, and the H. SOTHERAN & CO., 136 STRAND, W.C.; AND 37 PICCADILLY, W., LONDON. Just Issued. BOTANICAL CATALOGUE, Part VIII. THROAT AND COUGH Soreness and Dryness, Tickling and Irritation, inducing Cough and affecting the Voice. 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Proof impressions of these, printed on India paper, may be had from the Publishers, price 5s. each; or the Set of 27 Portraits in a Handsome Portfolio for £7, carriage paid. THE PORTFOLIO MAY BE HAD SEPARATELY, PRICE 6s. Cheques and Money Orders payable to OFFICE OF "NATURE," 29 BEDFORD STREET, STRAND. |