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Naturalists and Manufacturers of
CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

BRANCHES OF NATURAL HISTORY.
SPECIAL SHOW-ROOM FOR CABINETS.
N. B.-For Excellence and Superiority of Cabinets and Apparatus, reser:
ences 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.)
Our Catalogue (96 pp.) Post free on application.
ROCKS, MINERALS, FOSSILS.
For Collectors, Students, Technical Schools, Colleges, &c.

COLLECTIONS IN POLISHED DEAL BOXES.
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/-. Adapted for the Board of Education Examinations in

Geology, Physiography, and Mineralogy.
A large stock of Minerals, Rocks, Fossils and Microscopic Objects for

selection. Specimens sont on approval.
Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped

Boxes, Models of Crystals, &c., &c.

NEW CATALOGUE 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.

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.
HUGHES' PHOTO · ROTOSCOPE CINEMATOGRAPHS.

THE MOST PERFECT. No Flickering. Superb Mechanism.
Price £7 7 0. The Moto-Photo Camera for taking the Pictures.

Illustrated Lists, 2d.
See Mr. HUGHES' PATENT COMBINATION OPTICAL LANTERN,
&c. Miniature Triple Lantern constructed for B. J. MALDEN, Esq. ; great
success. New Oxybydrogen Microscope. Science Lanterns for Class De.
monstration. Magnificent Results. Docwra Triple, Prize Medals, Highest
Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN
GUINNESS, &c. Patent Pamphengo Science Lanterns. The Universal
Lantern 4-inch Condensers, 4-wick Lamp, Portrait Combination front
Leases, 18s. 6d. Marvellous value. Science Lecture Sets. Novelties.
The Lantern Kaleidoscope. Cheapest Lantern Outfits in the World,
Grandly Illustrated Catalogue, over 180 choice Engravings, 6d.;
Postage, d. Small Illustrated Catalogue, 100 pages, free, sd. List of
60,000 Slides and 300 Lecture Sets, Science Subjects, Views, &c., 6d.;
Postage, 2d. Pamphlets Froo..w. C. HUGHES, SPECIALIST,
Brewster House, 82 Mortimer Road, Kingsland, N.

LIVING SPECIMENS FOR

THE MICROSCOPE.

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.

SCIENTIFIC WORTHIES.

A List of this Series of Steel and
Photogravure Portraits of Men of
Science will be sent post free to any
reader of "Nature" on application to

the Publishers.

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.
onium ; Hormiphora (preserved); Leptoplana; Lineus, Ampbiporus,
Nereis, Aphrodite, Arenicola, Lanice, Terebella ; Lepas, Balanus,
Gammarus, Ligia Mysis, Nebalia, Carcinus ; Patella, Buccinum, Eledone,
Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinos.
Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c.

For prices and more detailed lists apply to
Biological Laboratory, Plymouth.

THE DIRECTOR.

ST. MARTIN'S STREET, LONDON, W.C.

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NOTICE.-Advertisements and business letters for Nature should be addressed to the Publishers; Editorial
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OFFICE: ST. MARTIN'S STREET, LONDON, WC.

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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.
This apparatus has been already installed by many of the chief workers in Electro-Therapeutics in France and England,

Descriptive Pamphlet gratis on application from the Sole Agents for Great Britain and its Colonies-
THE MEDICAL SUPPLY
SUPPLY ASSOCIATION,

228 GRAY'S INN ROAD,

LONDON, W.C., where the apparatus may be seen working. COUNTRY HOUSE LIGHTING

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LARGER

FAR

INSTALLATIONS

THE MOST

GIVE STILL

ECONOMICAL

MORE REMARKABLE

SYSTEM KNOWN.

RESULTS

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.

each

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.

attractive...

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.

BRANCH -16 Forrest Road, Edinburgh.

...

"THE NEW NATURALISTS'” CAMERA.

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J. H. DALLMEYER, Ltd., 25 Newman St., LONDON, W. Printed by Richard CLAY AND SONS, LIMITED, at 7 & 8 Pread Street Hill, Queen Victoria Street, in the City of London, and published by MACULAN

AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 60 Fifth Avenue, New York, - THURSDAY, Jan. 19, 1go5.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye."—WORDSWORTH.

No. 1839, VOL. 71] THURSDAY, JANUARY 26, 1905. [PRICE 15 CENTS
Registered as a Newspaper at the General Post Office.)

(All Rights are keserveu. NEW PATTERN "NEWTONIAN" “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.

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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

£10 10s.
N E W T O N & CO.,

OPTICIANS TO HIS MAJESTY THE KING
AND HR.H. THE PRINCE OF WALES AND THE GOVERNMENT,

3 FLEET STREET, LONDON.

CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied 19 National Physical Laboratory, Teddington, fitted for Gas, Water

and Electricity
Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200

Illustrations, free on application.
DESIGNS OP BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS.

14 COMMERCIAL STREET, LEEDS.

MOVING COIL

NEGRETTI & & ZAMBRA'S VOLTMETERS & AMMETERS. TRAVELLER'S SCIENTIFIC COMPANION.

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MOVING

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PARTS

BEAT.

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Prices from £2 2 0 to £2 7 6
I L. full description see our Electrical Catalogue, por free

on application 10
JOHN J. GRIFFIN & SONS, Ltd.,

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.

Faculties.
SCIENCE, ARTS, MEDICINE, COMMERCE.

SPECIAL SCHOOL OF MODERN LANGUAGES.
DEPARTMENT FOR TRAINING OF TEACHERS.

Scbools of -
ENGINEERING, METALLURGY, MINING, BREWING,

DENTISTRY

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

NORTHERN POLYTECHNIC

INSTITUTE,

HOLLOWAY, LONDON, N. (Close to Holloway Stn., G.N.R., and Highbury Sun., N.L.R.) LONDON UNIVERSITY SCIENCE AND ENGINEERING

DEGREES.
Day and Evening Courses in the above under recognised teacbers is-
MATHEMATICS,

PHYSICS,
CHEMISTRY,

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.

ING.

COACHING (THEORY AND

EAST LONDON TECHNICAL

COLLEGE,
MILE END ROAD, E.
New Teim began JANUARY 9, 1905.

/ 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.

EGYPTIAN GOVERNMENT.

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.

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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 :-
GAS ANALYSIS

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,

3

ROYAL INSTITUTION OF

GREAT BRITAIN.

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.

BROWNING'S SPECTROSCOPES.

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Unusual opportunity occurs for purchase of

Unique Valuable Conchological Collection, in Trays in Cabinets,
classified and mostly named, belonging to scientific man. Reply-

RICKARDS, Seldown, Poole.
For Sale.- What offers ? Journal Chemical

Society, 1891-1895. Chemical News, 1887-1898. Chem. Central
Blatt, 1897-1903. Ber. deutsch. chem. Gesellschaft, 1897-1904. All

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.

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McCLEAN'S STAR SPECTROSCOPE,

GEW'S

ILLOSCOPE

SCREEN

GLEW'S SCINTILLOSCOPE

(PATENT).
Shows a magnificent display of scintillations,
showers of sparks, direct from the mineral Pitch
blende, Radium, Polonium, Uranium, Thorium, or any
radio-active substance, even a Welsbach mantle con-
tains sufficient Thorium to excite the very sensitive
screen of the Scintilloscope, which is far more sensi.
tive than the Spinthariscope. The Scintilloscope
rivals the most delicate Electroscope as a detector
of Alpha rays.

The eye sees an inexhaustible shower of stars of
PITCKBLENDE white light, giving a very realistic idea of the ceaseless

activity of these marvellous substances which are pro. ducing the terrific bombardment causing this beautiful display.

See Nature, September 29, page 535.
Glew's Scintilloscope Superior Lens, with Extra-sensitive Pitchblende and

Polonium Screens, giving brilliant effects, Complete, 7s. 6d., Post free,

U.K. Foreign Postage extra, weight 2 ounces.
Pieces of Pitchblende mineral, ground fat and polished, with Sensitive

Screen attached, for use in Scintilloscope or with any strong pocket

magnifier, froin 75, 6d. each, according to size.
Radio active supplies of every description, on Sale or Hire. Radium

Bromide, 1,800,000 units on hire for lectures.
P. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900),

156 Clapham Road, London, S.W.

For use with a 3-inch or larger Telescope.

For Astronomical Work, £2 : 10 : 0.
With Slit Adaptor for Chemical and Astronomica

Work, £3 : 7 : 6.
Double Nose-piece for carrying above Spectro.
scope, and an Eye-piece, or two Eye-pieces, of

different powers, £1 : 15': .

CATALOGUES POST FREE. JOHN BROWNING,

MANUFACTURING OPTICIAN, 78 STRAND, LONDON, W.C.

RECTIFIERS.

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.

ARISTON” ALUMINIUM

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THE
FINE ADJUSTMENT

(PATENT)
FOR MICROSCOPES
entirely eliminates the reflex action
or side movement which occurs in
most instruments when slight pressure
is exerted in giving movement to the
Micrometer screw when focussing an

object.
IT See Commendatory Notice in NATURE,

November 6, 1902, page 15.
LISTS POST FREE
JAMES SWIFT & SON,
81 TOTTENHAM COURT ROAD, LONDON.

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Made in Four sizes, to charge

from ļ to 6 Amperes, 17s. 6d. to £8 8s.

FOR PARTICULARS WRITE

OR CALL.

STEWART, LIVETT & CO., 62 Theobalds Road, London, W.C.

(FOUR MINUTES WALK FROM HOLBORN TOWN HALL )

COLOUR PHOTOGRAPHY.

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/-
Send for New Booklets, post free to readers of Nature," or

call and see results ontained by amateurs. SANGER-SHEPHERD & CO., 5, 6, 7 Gray's Inn Passage, Red Lion Street, Holborn, London.

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