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WATKINS & DONCASTER,
Naturalists and Manufacturers of
BRANCHES OF NATURAL HISTORY.
Workmen true to Nature.
(Five Doors from Charing Cross.)
COLLECTIONS IN POLISHED DEAL BOXES.
20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in
Geology, Physiography, and Mineralogy.
selection. Specimens sont on approval.
Boxes, Models of Crystals, &c., &c.
NEW CATALOGUE 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. Subscription in advance, either Monthly, 7/»; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.
ALBERT EDWARD JAMRACH
(Late CHARLES JAMRACH),
NATURALIST, 180 ST. GEORGE STREET EAST. Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery,
Netsukis China, Lacquers, Gongs, Shells, and other Curios.
TO SCIENCE LECTURERS.
THE MOST PERFECT. No Flickering. Superb Mechanism.
Illustrated Lists, 2d.
LIVING SPECIMENS FOR
Volvox, Spirogyra, Desmids, Diatoms, Amba, Arcella, Actinosphærium, Vorticella, Sientor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price is. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes.
THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM.
A List of this Series of Steel and
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, Caryophylila, Alcy.
For prices and more detailed lists apply to
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IMPORTANT ANNOUNCEMENT. D'Arsonval's Latest (1904) Apparatus,
DISPENSING WITH COILS & INTERRUPTERS. X-RAYS & HIGH-FREQUENCY CURRENTS.
For producing, perfectly regulating, and exactly measuring
(Protected by Numerous Patents.) SILENT IN WORKING.
SIMPLE IN MANIPULATION.
Descriptive Pamphlet gratis on application from the Sole Agents for Great Britain and its Colonies-
228 GRAY'S INN ROAD,
LONDON, W.C., where the apparatus may be seen working. COUNTRY HOUSE LIGHTING
GAS PLANT. GAS ENGINE AND DYNAMO. Electric Current for 100 16-c.p. lamps can be obtained for ONE PENNYWORTH of fuel per hour by using a CROSSLEY GAS ENGINE and Dynamo combined, running on a CROSSLEY SUCTION GAS PLANT.
Full particulars and testimonials on reference to CROSSLEY BROS., LTD., OPENSHAW MANCHESTER.
WATSON’S MICROSCOPES & OBJECTS. Watson's New “Club" Microscope. An Instrument of full size of New Slide of Radium for Microscope. Shows Scinullations ... most modern design. Especially arranged for the use of Amateurs. brilliantly, and easily managed-quire new
5 6 Monocular, £15; Binocular, £18.
Trypanosoma Brucei (Sleeping Sickness)
40 Human Spinal Cord --prepared by Golgi's method
4 0 Watson's well-known Van Heurck and Edinburgh Student's Micro
Beautiful Polyzoa --Cristatella inucedo, with Slatoblasts
3 0 scopes have been re-modelled in the Stage and Foot, and give even
Coelenterata-Campanularia, Obelia, Clytia, and many others, greater convenience for working than before.
2 6 The Watson-Conrady Condenser System is of new computation, and
Exquisite arranged groups composed of Diatoms, Splcules. &c.
according to size, from is expressly designed for Photo-Micrography.
5/- to 21 0
Scales and Hairs of Insects arranged to represent Sprays, New Aplanatic Magnifiers. New Objectives. Everything Bouquets, and Vases of Flowers, always interesting and for the Microscopist.
1/6, 15/-, 21/- and 42 0
Write for Catalogue No. 3 of Micro. Objects, together with newly For all the above see WATSON'S 158-page Catalogue of Microscopes, sent published supplementary list of Slides, giving details of recently post free.
added specimens, post free. (SPINTHARISCOPE for observing the Scintillations of Radium. The very best. Price 21/SPECIALITIES:- STRUTT'S RADIUM CLOCK. Price according to quantity and quality of Radium included.
RADIUM of MAXIMUM activity in stock, also of medium and moderate activities, Send for particulars. w. WATSON & SONS, 313 HIGH HOLBORN, LONDON, W.C. ESTABLISHED 1837.
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No. 1839, VOL. 71] THURSDAY, JANUARY 26, 1905. [PRICE 15 CENTS
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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 achromstic Front Lens, and “Newtonian ” Hand. Teed Arc Lamp. Complete in Case
OPTICIANS TO HIS MAJESTY THE KING
3 FLEET STREET, LONDON.
CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied 19 National Physical Laboratory, Teddington, fitted for Gas, Water
Illustrations, free on application.
14 COMMERCIAL STREET, LEEDS.
NEGRETTI & & ZAMBRA'S VOLTMETERS & AMMETERS. TRAVELLER'S SCIENTIFIC COMPANION.
Prices from £2 2 0 to £2 7 6
on application 10
SARDINIA ST., LONDON, W.C.
Aneroiid Barometer, with altitude sca'e, Pocket Compass, with patent dial, and a Thermometer having Fahrenheit and Centigrade Scales for a Clinical Tl ermometer may be substituted), from £4 10s. to £; 135.
Can also be had mounted in Gold or Silver
VERY SUITABLE FOR PRESENTATION. “Special" Illustrated Price List of Instruments suitable for
Presents free by post to all parts of the Worid.
38 HOLBORN VIADUCT, E.C. Branches--45 CORNITILL ; 122 REGENT STRELT.
UNIVERSITY OF BIRMINGHAM.
SPECIAL SCHOOL OF MODERN LANGUAGES.
Scbools of -
Leading to Degrees and Diplomas. ALL COURSES AND DEGREES ARE OPEN TO BOTH MEN AND WOMEN STUDENTS.
In the Medical School there is a separate Dissecting Room for Women with a qualified Woman Demonstrator.
Graduates of other Universities may, after two years' study or research, take a Master's Degree.
Syllabuses with all information will be sent on application to the SECRETARY
HOLLOWAY, LONDON, N. (Close to Holloway Stn., G.N.R., and Highbury Sun., N.L.R.) LONDON UNIVERSITY SCIENCE AND ENGINEERING
ENGINEERING. Separate Laboratories for Elementary, Advanced and Honours students, exceptionally large and well equipped.
RESEARCH. Accommodation and apparatus provided for research in either Pure or Applied Chemistry and Physics, and Engineering, in rooms specially adapted for this purpose, Full particulars at the Institute or sent on receipt of postcard.
REG S. CLAY, D.Sc., Principal.
COACHING (THEORY AND
EAST LONDON TECHNICAL
/ J. L. S. HATTON, M.A., and Mathematics
W. F. S. CHURCHILL, M.A. • Chemistry..
is. T. HEWITT, D.Sc., and
! C. SMITH, D.Sc. Mechanical Engineering ..
D. A. Low, M.I.M.E., and J. A.
DAVENPORT, B.Sc., Vict. Electrical Engineering
1. T MORRIS, AMI.E.E. Physics
SR. A. LEHFELDT. D.Sc, and
W. H. WHITE, B.A., B.Sc. Botany
V. H. BLACKMAN, M A. The DAY CLASSES for students over 16 years of age include full three years' technical courses in Chemistry and Engineering, and three years' courses for London University Degrees (Pass and Honours).
EVENING CLASSES are held in Advanced Technical and Scientific subjects, and for London University Degrees.
SCHOLARSHIPS of the value of £40 per annum will be awarded oy the Drapers' Company in June next. CALENDAR with full particulars po-t free, 4 d.
J. L. S. HATTON, Director of Studies.
In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for MEDICAL EXAMS.
Especial Course of Instruction in THERAPEUTICS, PHARMA COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY EXAM.
Mr. FREDERICK DAVIS, The Laboratories, (Registered in Column B (Advanced Education), Teachers Registration
Councii, Board of Education, S.W.), 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C.
MINISTRY OF PUBLIC INSTRUCTION. The post of PROFESSOR of PATHOLOGY and BACTERIOLOGY atihe School of Medicine, Cairo, is vacani. Pay, 680 per annum, privale practice not allowed. Applicants should forward copies of testimonials and such other documents as are mentioned in the printed particulars respecting the post, which may be obtained from the Secretary of the Conjoint Beard of England, Examination Hall, Victoria Embankment, London, Toe latest mail by which applications may be posted will leave L ndon on Friday, February 17. Application to be addressed to the DIRECTOR, Governmert School of Medicine, Cairo, Egypt.
THE SIR JOHN CASS TECHNICAL
INSTITUTE, JEWKV STREET, ALDGATE, E.C. Evening Classes in Chemistry, Metallurgy, Physics and Mathematics designed to meet the requirements of those engaged in Chemical, Metallurgical and Electrical Industries and in trades associated therc with.
Special Courses during the Lent Term :-
CHARLES A. KOHN, M.Sc., Ph.D., F.I.C. METALLOGRAPHY C. 0. BANNISTER, Assoc. R.S.M.
Full curriculum for B.Sc. Examination of London University in Experimental Science under recognised Teachers of the University.
GLASS BLOWING. Two Courses of Instruction will be given during the Term by Mr. A. C. Cossor.
NEW TERM began MONDAY, JANUARY 9, 1905. The Institute is readily accessible and near to Fenchurch Street, Liver. pool Street, Broad Street and Metropolitan Railway Stations.
For details of the Classes apply at the Office of the Institute, or by letter to the PRINCIPAL.
W. H. DAVISON, M.A., Clerk to the Governing Body,
ROYAL INSTITUTION OF
TO SCIENCE AND MATHEMATICAL
MASTERS.--Required immediately (1) Master for Chemistry, Mathematics, and Botany. Salary, 4140 to commence. County School. (2) Tutur take Mathematics to Army Sia Jard Chemistry er Geometrical Drawing Coaching Establishment, clore Loncoll. Lou resident. Applications are also invited from Selence and Mathematical Masters seeking appointments for aller Easter. Early notice assured of all the best vacancies. Address GRIFFITHS, SMITH, POWELL & SMITH, Scholastic
Agents (Estd. 1833), 34 Bedford Street, Strand, London. MARINE BIOLOGICAL ASSOCIATION
OF THE WEST OF SCOTLAND. DIRECTOR wanted for the Marin. Biological Siativ av Millport. Full particulars from JOHN A. Todv), Hon. Secretary, 1 West Groust Street, Glasgow.
ALBEMARLE STREET, PICCADILLY, W. THURSDAY, next, February 2, at Five o'clock, Professor W. SCHLICH, PhD., C.1. E, F, GS. First of Two Lectures of Forestry in the British Empire.” Half-a-guinea the course.
SATURDAY, February 4, at Three o'clock, Sir ALEXANDER C. i MACKENZIE, Mus. Doc., D.C.L., LL.D). First of Three Lectures on "The Bohemian School of Music,' with Musical Illustrations. Hall-a-guinea.
Subscription to all Courses in the Season, Two Guineas.
MUNICIPAL SCHOOL OF TECH
NOLOGY, MANCHESTER. Applications are invited for the post of JUNIOR MATHEMATICA, LECTURER. Candidates must be qualified to teach the subjects of the Final B.Sc. of London l'niversity in Pure and Applied Matheinat .. Salary, 4130 per annum. Applications to be forwarded not later than January 30 to
J. H. REINOLDS, Principal.
Skilled Mechanic (preferably with electrical
experience), accustomed to the manufacture of High class schontit Instruments Apply, natin: age, esperience and salary fruit
REYNOLD. & BHANSON, Lid., in ('ommercial Surel, l-ods. For Sale.- Very extensive X-ray Installation,
Comprining Mercury Jet Interruptor, Operating Couch, Loisiere, Screens, Kesistances, Holders, &c. Suit Hosptal Price cas, in
cluding Wim-burst Machine. -R, Maven, 18 Gt Alarlborough For Sale.--Volumes of Nature," roughly bound, from November, 1860. to Januan. 10.5.
Apply - Laur.com C. R. Wouds, K.A.N.C., Royal Irtirmary, Dubin
Private Museum for Sale. Includes Con.
chology, Geology, Ornithology, Piscatology, Osteology, Arms, Weapons, Polished Stones, Eggs : all named and classified, with small library. Boxed in trayed Cabinets. 30 years' collection. Apply, RICKARDS, Seldown, Poole.
Unusual opportunity occurs for purchase of
Unique Valuable Conchological Collection, in Trays in Cabinets,
RICKARDS, Seldown, Poole.
Society, 1891-1895. Chemical News, 1887-1898. Chem. Central
well bound and in good condition. Address, “ M. N.;" c/o NATURE. Chemist, with good academic qualifications,
seeks appointment Experience : Electrolytic, Metallurgical, Organic and Mineral Analysis and Research. N. D. L., c/o NATURE.
McCLEAN'S STAR SPECTROSCOPE,
The eye sees an inexhaustible shower of stars of
activity of these marvellous substances which are pro. ducing the terrific bombardment causing this beautiful display.
See Nature, September 29, page 535.
Polonium Screens, giving brilliant effects, Complete, 7s. 6d., Post free,
U.K. Foreign Postage extra, weight 2 ounces.
Screen attached, for use in Scintilloscope or with any strong pocket
magnifier, froin 75, 6d. each, according to size.
Bromide, 1,800,000 units on hire for lectures.
156 Clapham Road, London, S.W.
For use with a 3-inch or larger Telescope.
For Astronomical Work, £2 : 10 : 0.
Work, £3 : 7 : 6.
different powers, £1 : 15': .
CATALOGUES POST FREE. JOHN BROWNING,
MANUFACTURING OPTICIAN, 78 STRAND, LONDON, W.C.
For charging any class of Accumulators, direct from alternating mains. Works on any periodicity or voltage. Action abso. lutelyinfallible. No moving parts High efficiency. Requires no attention.
November 6, 1902, page 15.
Made in Four sizes, to charge
from ļ to 6 Amperes, 17s. 6d. to £8 8s.
FOR PARTICULARS WRITE
STEWART, LIVETT & CO., 62 Theobalds Road, London, W.C.
(FOUR MINUTES WALK FROM HOLBORN TOWN HALL )
SANGER-SHEPHERD QUICK CHANGE, ONE PLATE, LATEST PATTERN OUTFITS.
EXCELLENT Photographs in Colour are obtained with our smaller lens filter Outfits, complete from 25/- ; but for general work, Landscapes in changing light, Portraiture or Photomicrography where rapid exposures in succession are necessary, the Repeating Back with Colour Filters is recommended as the best all round appliance.
It may be attached to any }, for whole-plate camera or glass plate Kodak, by means of a panel cut to correspond and interchangeable with the ordinary dark slide. This does not in any way interfere with the use of the camera for ordinary work. The three Colour Filters are held in a frame, clipped in front of the double dark slide which carries the two plates, each large enough to record the three negatives side by side, when ihe slide is pushed past the opening in the outer case. With this Outfit, even a beginner will secure three-colour negatives with the ease and certainty of an ordinary photograph.
Repeating Back Attachments, with Filters complete, from 90/-
call and see results ontained by amateurs. SANGER-SHEPHERD & CO., 5, 6, 7 Gray's Inn Passage, Red Lion Street, Holborn, London.