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ILLUSTRATED LIST (“A”) OF SPECTROSCOPES AND ACCESSORIES GRATIS. ADAM HILGER, Ltd., 75a Camden Road, London, N.W.
AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.
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, adjustDent for Bertrand Lens by rack and pinion, with slits for quartz wedge, sliding prism box, Íris diaphragm between prism box and Bertrand Lens, with triple nose-piece and centring adjustment. Complete with polarising apparatus, large nickel prism in revolving mounting, with German silver graduated scale, including 14", 1", and l" objectives; 2", 19", and 1"
hair-line eyepieces, in Mahogany cabinet, £36. WE HAVE MODIFICATIONS OF THIS INSTRUMENT
FROM £21 17s. Bd., UPWARDS. We shall be pleased to show this instrument, together with our large collection of Student, Bacteriological, Metallurgical and
Chemical Microscopes to interested clients.
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,
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.
Sole Representatives of the BAUSCH & LOMB
OPTICAL CO., for U.K. and Colonies, A. E. STALEY & CO.,
Contractors to H.M. Government, Universities, Hospitals, &o., 19 THAYIES 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,
BY APPOINTMENT TO THE ROYAL INSTITU.
TION OF GREAT BRITAIN.
INDUCTION COILS A SPECIALITY.
ELECTROMETER, NEW PATTERN. 56 CHARING CROSS ROAD, LONDON,
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. Svo.
CHEMISTRY OF THE PROTEIDS.
By GUSTAV MANN, M.D. (Edin.), B.Sc.
(Oxon.), University Demonstrator of Physiology, Oxford. Based on Professor Otto Cohnheim's “Chemie der Eiweisskörper.” 8vo. 155. 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.
With its Applica
tions to the Determination and Reduction of Positions of the Fixed Stars. By SIMON NEWCOMB. 8vo. 125. 6d. net.
AN INTRODUCTION TO ASTRONOMY. By FOREST RAY MOULTON, Ph.D.
Illustrated. Crown 8vo. 55. net.
THE BIOLOGY OF THE FROG.
By SAMUEL J. HOLMES, Ph.D., Assistant Professor of Zoology in the University of Wisconsin. Illustrated.
Crown 8vo. 6s. 6d. net.
THE NEW EARTH.
A Recital of the Triumphs of Modern Agriculture in America. By W. S.
HARWOOD, Author of “New Creations in Plant Life.” With many Illustrations. Crown 8vo. 75. 6d. net.
WATKINS & DONCASTER,
Send for our
Naturalists and Manufacturers of
BRANCHES OF NATURAL HISTORY.
Workmen true to Nature.
(Five Doors from Charing Cross.)
FLATTERS & GARNETT, Ltd.,
6s. per gramme.
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 Rhodophyceæ ; Peronospora, Saccharomyces, Claviceps, Puccinia, Antho. ceros, Pilularia, Marsilea, Isoetes, Psilotum, Selaginella, Pinus, &c.
Catalogue Post Free..
NEW and EXTENDED EDITION of TABLE of RARE ELEMENTS, giving full scientific particulars, 6d. post free.
ARMBRECHT, NELSON & CO., 71 & 73 Duke Street, Grosvenor Square, London, W.
NOTICE OF REMOVAL. JAMES R. GREGORY & Co.,
of KELSO PLACE, KENSINGTON, beg to announce that they have removed to more convenient
and commodious Premises at 139 FULHAM ROAD, SOUTH KENSINGTON, S.W.
Minerals, Rocks, Fossils, Metallic
all prices. Inspection invited.
RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington,
Stock of over 19,000 Specimens of Weapons, Implements, Ornaments,
Dress, Idols, Musical Instruments, &c., &c., used by all the Races of Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinospbærium, Mankind, for sale at very low prices. All objects guaranteed genuine. Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many
Trophies of genuine old Arms made for Billiard Rooms, Halls, &c., other specimens of Pond Life. Price is. per Tube, Post Free. Helix prices from 255. ; also mounted Horns.- Catalogue of Ethnographical pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. Specimens illustrated with Bromide Photographs, 4d. monthly, 3s. 6d.
yearly. Collections Arranged and Catalogued. Specimens bought. THOMAS BOLTON,
W. 0. OLDMAN, 77 BRIXTON HILL, LONDON, S.W. 25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION
Collections and Single Specimens of
British and Foreign OF THE UNITED KINGDOM.
MINERALS, ROCKS, FOSSILS. THE LABORATORY, PLYMOUTH.
25 Specimens, 5/6 ; 50 do., 10/6; 100 do., 21/- ; 200 do., 42/-, The following animals can always be supplied, either living 20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-.
In Polished Deal Boxes. or preserved by the best methods :
Sgcon; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryophyllia, Alcy. Inspection invited of a large stock of Minerals, Rocks, Fossils, and onium: Hormiphora (preserved); Leptoplana; Lineus, `Amphiporus,
Microscopic Objects. Specimens sent on approval.
NEW CATALOGUES POST FREE.
THE DIRECTOR. THOMAS D. RUSSELL, 78 Newgate St., London, E.C.
CHARGES FOR ADVERTISEMENTS.
A s. d.
A s. d. Yearly 18 o Yearly
*Three Lines in Column o 3 6 Quarter Page, or Half
1 15 0 0 14 6 Half-yearly
0 15 6 One Sixteenth Page, or Eighth Col. 10 Halla Page, or a Column 3 5 Quarterly 0 7 6 Quarterly
8 o One Eighth Page, or Quarter
018 6 | Whole Page.
1 10 6
6 6 0
THE GAIFFE AUTO-MOTOR
(Patented in Britain).
The interruption cuts the current both for motor and coil. In other words, motor and interrupter are electrically and mechanically linked together. Rups 500 working hours
without requiring attention. 00
İT 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 Testirsenichi
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 TELESCOPES WATSON'S MICROSCOPES.
23 DIFFERENT MODELS to select from, suited for
s. d. Tripod, with Altazimuth Head ...
15 0 0
every class of research. The “ ROYAL CENTURY," with 34-inch Objective, mounted on Garden Tripod, with Altazimuth Head, having move.
From $2 : 2 : 6 upwards. ments by screws and Hook's handles ...
36 10 0 The above are fitted with the beautiful Watson-Conrady
Watson's Microscopes are designed to afford the utmost conObjectives, yielding the finest performance.
venience and comfort combined with absolute accuracy for The “POPULAR," with 3-inch Objective, mounted on Garden
scientific work. They are up-to-date and of highest quality. Tripod, with Altazimuth Head ...
9 100 For larger sizes of above and full particulars of
For full particulars see WATSON'S TELESCOPES WATSON'S 1906 CATALOGUE OF MICROSCOPES Send for List No. 6, post free on application.
(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 .
Ammonium Fluor. scopists.
ide, or Willemite. Made in the “H" and straight forms as shown.
PRICE, 4 - each. Argon or Helium tubes
PRICE of case conCadmium tubes...
taining 6 tubes as
illustrated, 25/Tubes containing Hydrogen, Oxygen, Water Vapour, Nitrogen,
each. Carbon Dioxide, Mercury, and Hydrogen and Mercury.
These tubes can be "H" form...
worked from a 1" Straight form
spark induction coil. A. C. COSSOR, 54 Farringdon Road, London, E.C. Awarded Golil 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 CRECISTERED)
Mounted in Aluminium. small lens without disturbing
Measures 31 ins. long, if ins. plates or films which may be
diameter, weighs 4 ounces. in position.
9 H Dall mye??
PRICE, including Solid Leather Can be used alone for higher
Case, £3 10 0 nett. magnification or larger plates.
ILLUSTRATED BOOKLET with An excellent lens for all
Specimens of Work artistic photography.
FREE. J.H. DALLMEYER, LTD., 25 Newman St., London, W.
MAKERS OF THE CELEBRATED_DALLMEYER LENSES. Innicu by KICHARD ULAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE
“ To the solid ground
Of Naturo trusts the mind which builds for aye.”— WORDSWORTH.
[PRICE 15 CENTS Registered as a Newspaper at the General Post Office.)
(All Rights are Reserved. NEW PATTERN “NEWTONIAN” CHEAP
REYNOLDS & BRANSON, Ltd.,
Chemical and Scientific Instrument Makers to His Majesty's ELECTRIC LANTERN.
Government (Indian, Home, and Colonial). LABORATORY FURNISHERS and MANUFACTURING CHEMISTS.
5067 New Iron-Body Lantern, with brass front, fitted on mahogany board, 4-in. double Condenser, best full-size achromatic Front Lens, and "Newtonian ” Hand-Feed Arc Lamp: CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied Complete in Case
to National Physical Laboratory, Teddington, fitted for Gas, Water " & .,
Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200 OPTICIANS TO HIS MAJESTY THE KING
Illustrations, free on application. ANO HR.H. THE PRINCE OF WALES AND THE GOVERNMENT,
DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS. 3 FLEET STREET, LONDON.
14 COMMERCIAL STREET, LEEDS. NEGRETTI & ZAMBRA'S
When ordering state diameter of Thermometer.
JOHN J. GRIFFIN & SONS, Ltd.,
Illustrated Price List and full particulars post free on
application to NEGRETTI & ZAMBRA,
38 HOLBORN VIADUCT. Branches: 45 CORNHILL, and 122 REGENT STREET,