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THE STEREOSCOPIC COMPANY'S

C. E. MÜLLER, ORME & CO.'S NEW RESISTANCE ARTIST'S REFLEX GLASS

CAMERA

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excels Jena Glass in its power to stand

sudden variations of temperature.

The finest possible instrument for all practical purposes, embodying every scientific requirement.

N.B.-- The official test at the Charlottenburg Institute showed that with this glass the alkali dissoived by 100 c.c. of distilled water is to milligrammes as compared with li milligrammes dissolved from Jena glass under the same conditions.

IT IS AS CHEAP AS THE COMMON

BOHEMIAN GLASS.

MAY BE HAD IN

BEAKERS (various forms),
FLASKS (all shapes),

TUBING (any size).

The Ideal Camera for

Price List free on application to
C. E. MÜLLER, ORME & CO., Ltd.,

CONTRACTORS TO H.M. GOVERNMENT,
148 HIGH HOLBORN, LONDON, W.C.

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Printed by RICHARD CLAY AND SONS, LIMITF1), at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City o London, and published by MACAULAN

AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, Feb. 23, 1993,

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A \'EEKLY ILLUSTRATED JOURNAL OF SCIENCE

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

[PRICE 15 CENTS

No. 1844, VOL. 71) THURSDAY, MARCH 2, 1905.
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

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Das Zeisswerk
und die Carl-Zeiss-Stiftung in Jena.

Ihre wissenschaftliche, technische und soziale Entwickelung

und Bedeutung
für weitere Kreise dargestellt

von Felix Auerbach.

Zweite vermehrte Auflage. The above Lantern has a clear base board and is fitted with 5-in. Condensers.

Mit 86 Abbildungen im Text.
NEWTON & CO., 3 FLEET ST., LONDON.

Preis: brosch. 2 Mark, geb. 2 Mark 50 Pf.
THE NEW

NEGRETTI & ZAMBRA'S

SELF-RECORDING 39 .

METEOROLOGICAL INSTRUMENTS.

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"LONDON'

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MICROSCOPE,

With Eye-piece z inch, 1 inch
Obiect · glasses, in Mahogany

Case,
£5 12s. 6d.

THE NEW PATTERN COMBINED BARO-THERMOGRAPH.
Double Nose-piece, 9/- extra.

The above instrument combines in one apparatus the Recording Baro-
Focussing Substage, 14/6 extra.

meter and Recording Thermometer, giving thus on one and the same chart
continuous records of the atmospheric pressure and temperature for seven
days.

VERY SUITABLE FOR PRESENTATION.
R. & J. BECK, Ltd., Illustrated Price List of Self-Recording Meteorological Instruments,

or “Special" Illustrated List of Scientific goods suitable for
68 CORNHILL,

Presents, Post Free to all parts of the World.

38 HOLBORN VIADUCT, E.C. LONDON. Branches-45 CORNHILL, and 122 REGENT STREET.

COL

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UNIVERSITY OF BIRMINGHAM. BIRKBECK faculties.

BREAMS BUILDINGS, CHANCERY
SOIENCE, ARTS, MEDICINE, COMMERCE.

FACULTY OF SCIE
SPECIAL SCHOOL OF MODERN LANGUAGES.

DAY AND EVENING COURSES
DEPARTMENT FOR TRAINING OF TEACHERS.

Chemistry

J. E. Mack
Scbools of

H. WE, P.
ENGINEERING, METALLURGY, MINING, BREWING,

ALBERT GRIT
Physics ...

D. OWEN, BA!
DENTISTRY

(B. W CLACK

E. H. SMA
Leading to Degrees and Diplomas.

Mathematics

{

W. G. BIRT

A. B. RENDE ALL COURSES AND DEGREES ARE OPEN TO BOTH MEN AND WOMEN Botany

F. E F-IT CU STUDENTS.

Zoology..

H. W. UNTNS In the Medical School there is a separate Dissecting Room for Women Geology & Mineralogy

GRO. F HAR with a qualified Woman Demonstrator,

Assaying, Metallurgy & Mining. Geo. P Graduates of other Universities may, after cwo years' study or research, take a Master's Degree.

RESEARCH in Chemistry and Physics in well-equiem

French, German, Spanish, Russian, Dutch, &
Syllabuses with all information will be sent on application to the
SECRETARY.

EVENING CLASSES also in Biology, Physiol gy;
Building and Machine Construction, Steam, Tbeon
Mechanics, Land and Quantity Surveying, and Estima

Calendar 6d. (post free 8d.), on application to the Sea
At the SOUTH-WESTERN POLYTECHNIC,
Manresa Road, Chelsea, S.W., Day College Courses of thiriy bours

TUITION
per week will be conducted in preparation for the London University
Degrees of B.Sc in Mechanical and Electrical Engineering, in Chemii.

BY try, Physics and the Natural Sciences. The composition fee for the Session of three terms, 1904-1905, is 4.15., These Courses are recog;

CORRESPONDENO nised for “Internal Students of the University, and consist of lecture and laboratory instruction. The Courses are conducted by : For Matriculation, B.A , Scholarships, and Profession MECHANICAL ENGINEERING, W. W. F. Pullen; ELEC. Tuition in Latin, Greek, French, German, Italian. Mailer TRICAL ENGINEERING, A. J. Makower ; CHEMISTRY, J. B. Physics, Chemistry, P-ychology, Logic, Political Econom Coleman, J. C. ('rocker, and F. H. Lowe; MATHEMATICS and The Staff includes Graduates ir Oxford, Cambridge. Lo PHYSICS, S. Skinner, W. H. Eccles, J. Lister and L. Lownds; Universi'ies.-Address Mr. J. CHARI ESTON, B.A , Burling BOTANY, H. B. Lacey and T. G. Hill; GEOLOGY, A. J. Maslen ence College, Clapham Cummon, London, S.W. In the evenings similar Courses will be conducted, but at £2 per Session. Also TECHNICAL DAY COURSES of three years' duration are arranged as a preparation for the Engineering, Elec

(UNIVERSITY OF LONDON.) trical and Chemical ard Metallurgical professions. The Laboratories SOUTH - EASTERN AGRICULT and Workshop are open for RESEARCH under the direction of the Principal and the Heads of Departments.

COLLEGE, WYE, KENT Further particulars may be obtained on application to the Secretary, salapy, 4300 per annum.

Applications are invited for the post of BOTANIST:

For details as to duties, &c, a who will send either the Day College Prospectus and Calendar or the

SECRETARY. Evening Class Prospectus for 3d. The Prospectuses may be had at the Office for id.

QUEEN'S COLLEGE, LONDO

43, 45 HARLEY STREET, W. BEDFORD COLLEGE FOR WOMEN.

Appointments to the Arnout Professorship of Natural Phil (UNIVERSITY OF LONDON.)

the Professorship of Mathematics will be made for October nest

tions must be sent in by March 25. Should an applicant be YORK PLACE, BAKER STREET, W.

two chairs might be combined. For all particulars apply to the

SECRETARY. ENTRANCE SCHOLARSHIPS. Two Entrance Scholarships, each tenable for three years at Bedford TO SCIENCE, MATHEMATICAL College for Women, will be offered for competition in June, 1905.

OTHER MASTERS.-Required (1) Second Master DEPARTMENT FOR PROFESSIONAL TRAINING IN

Grammar Scbool - Mathcs. and Science. Salary, 216 TEACHING.

(2) Head Master for Public Institution School near Loado:

ledge of Commercial Education necessary. Age 35 to 45. Students are admitted to the Training Course in October and January. Salary, £200, with board and private rooms. (3) Chemis The Course includes full preparation for the examinatious for the Teaching

and some Physics, £150 to £160. (4) Chemistry, Mathese Diplomas granted by the Universities of London and Cambridge, held 6140. Particulars of the above and other Science posts annually in December.

on application. Candidates seeking appointments auber A Course of Lectures on School Hygiene is held on Friday afternoons.

for after Easter are invited to apply forthwith. Address, Full particulars on application to the PRINCIPAL.

SMITH, Powell & Smith, Tutorial Agents (Estab. 1833),

Street, Strand, London. NATURAL SCIENCE SCHOLARSHIP. Laboratory Assistant requires employm KEBLE COLLEGE, OXFORD.

about Easter; nearly three years' experience in public cha

character and testimonials.--"H. B.," cho NATURE, St. A A SCHOLARSHIP of the annual value of £60, together with Laboratory

Ste:t, W.C.
Fees, not exceeding £20 per annum, will be awarded at this Cillege in
March, 1905.
'I he Examination coinmences Tuesday, March 14.

CONCHOLOGY.-An unusually good opp Subjects : Chemistry or Biology, with Elementary Mechanics and Physics

tunity to purchase. ne of the finest collections of shells (marte for all Candidates, and Elementary Cheinistry for those whoffer Biology.

and lo sil).. Pinked pecimens trom Goodall, Johnson, Arge For full particulars apply to Dr. HATCHETT JACKSON, Keble College,

and Gwaihin; in good cabinets (mahogany and pine). Clied Oxford.

1 early all named and trayed in their families.- Apply "Rised

Poole.
GUY'S HOSPITAL.

For Sale.-Extensive Collections of Art ENTRANCE SCHOLARSHIPS IN SEPTEMBER, 1995.

Lepidoptera, Coleoptera, 1 rupical Butterflies, Cabiners, &c con

nained type collections at very moderate prices. - Particular Five Open Scholarships, Three ( 6150, 463 and £50) in Science, a d Two A. FORD, Hillside, Sunnybill, Pokesdown, Hournemouth. (£100 and £50) in Arts.

Particulars and Copies of Examination Papers on application to the
DEAN, Guy's Hospital, London Bridge, S.E.

For Sale, “Annals of Botany.” Vols 1.

XVIII., unbound. - Dr. Wilson, Univer-ity, St. Andrew
GUY'S HOSPITAL.

TYPE-WRITING UNDERTAKEN
PRELIMINARY SCIENTIFIC (M.B. Lond.).

HIGHLY EDUCATED WOMEN ACCUSTOMED TO C.

TIFIC MSS. (Clas-ical Tripos, Intermediate Arts, Cambaid a Classes are held throughout the year Special instruction is given for the Lucal, thorough scquaintance with Modern Languages July Examination.

Revision, Translation. Scale of charges on application. Fee 16 guineas.

bridge Type-wruing Agency, 10 Duke Strext, Adelphi, W.

Sales by Auction. IMPORTANT COLLECTION OF LEPIDOPTERA. TUESDAY, MARCH 14, AND WEDNESDAY, MARCH 15,

AT ONE O'CLOCK.

Under-timed

MR. J. C. STEVENS will offer at his

Rooms, 38 King Street, Covent Garden, London, W.C., the FIRST PORTION (unless previously disposed of by Private Treaty) of the unrivalled COLLECTION OF BRITISH LEPIDOPTERA formed by the late PHILIP B. MASON, Esq., M.R.C.S., F.C.S., F.Z.S., F.E.S., &c., of Trent House, Burton-on-Trent, comprising Long and Superb Series of most of the Rare and Extinct Species-fine Varieties and Local Forms in the best state of Preservation ; also many Valuable and Historic Specimens and Types from the Hayworth and other Col. lections, together with the first-rate Standish and other Cabinets in

which they are contained. On view the Morday prior and mornings of Sale. Catalogues, ready a week prior to Sale, post free on application.

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IMPORTANT SALE OF BIRDS' EGGS. MR. J. C. STEVENS has received instruc

rions to OFFER for SALE on THURSDAY, MARCH 16, the FOURTH and FINAL PORTION of the COLLECTION of BIRDS' EGGS formed by HEATLEY NOBLE, E«q. The Sale will include one of the finest Specimens of the GREAT AUK'S EGG ever offered, together with such rarities as White's, Siberian, and Black. throated Thrush-Waxwing-Scarlet and Pine Grosbeak-Nutcracker - Needle-tailed Swilt-Honey Buzzard-Golden Eagle-Iceland and Jyr Falcon-Snow Goose - Pectoral and Marsh Sandpiper-Greensbank

- Dusky Redshank-Pomathorine Skua, &c. Catalogues, in course of preparation, may be had on application to Mr. J. C STEVENS, 38 King Street, Covent Garden, London, W.C.

Pyro-Metol

Developer makes a fresh solution which is so constituted as to produce good printing negatives from surprisingly short exposures.

Sold by all chemists and dealers Per carton to make 22 to 44 ounces, 1/

New booklet gratis

LANTERN and

MICROSCOPICAL SLIDES

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In all branches of NATURAL HISTORY, from 6/- per dozen.

Over 20,000 in Stock (As supplied to the Principal Universities, Technical Schools, &c.)

Send for Catalogues to the actual preparers.

FLATTERS & GARNETT, Ltd., Dealers in everything Microscopical, 48 Deansgate, Manchester.

LABORATORIES : 16 & 18 CHURCH ROAD, LONGSICHT, M/C. N.B.-Special Series of 48 Microscopical Slides for Students of Botany, in box, 21/- net. Book of Original Diagrams illustrating this Series, 1/- net.

LANTERNS. MICROSCOPES, NATURE STUDY appliances, &c. PROTO- MICROGRAPHIC APPARATUS. LEACH'S LANTERN MICROSCOPE. Speciality. LANTERN SLIDE- from Negatives, Book Illustrations, &c.

Correspondence invited.

SANGER - SHEPHERD

COLOUR OUTFITS

FOR SALE.-The Instruments in the

Observatory of the late Mr. Edward Crossley : a 9-in. and a 45-in. (both photo visual object glasses) Equatorial Refractor by Cooke ; a 34 in Transit Circle by Cooke ; a 61-in. Sextant and a s-in. Transit Theodolite by Troughton and Simms; Siderial Clock by Cooke ; Parallel-wire and Doubl--image Micrometers by Troughton and Simms; Microscopes by Ross and Zeiss; Apparatus for Lectures on Light, Polarisation, &c., by Harvey and Peak; Measuring Bars and Rods-12 in., 40-in., 3.st., 10-ft.-by Troughton and Simms; Standard Barometer by Hicks; Two Spectroscopes; Two Controlled Clocks. Apply to Mr J. GLEDHILL, Bermerside, Halifax.

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FOR SALE, 30 moving coil ammeters and voltmeters. 6 moving coil reflecting and pointer galvanometers. 8 hot wire ammeters and voltmeters, 50 electromagnetic ammeters and voltmeters. 60 dynamos and motors, direct and alternating current. 40 ironclad regulating rheostats. 20 transformers and choking coils. 10 inc'uction coils, 10-inch spark.

3 mercury jet breaks. Standard condensers, Wheatstone bridges, static machines,

switches, cables, &c., by various makers, at low prices. G. BOWRON, 57 EDGWARE RD., LONDON, W.

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SONOMETER

THE NEW "STUDENT'S”
STANDARD BAROMETER.

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VERTICAL TYPE.

Two wires can be loaded independently by weights, and in each case the lower end of the vibrating length can be unclamped and reclamped while the wire is under tension, frictional error being thus completely eliminated from the estimation of the stretching force.

For one wire an intermediate bridge is provided, which can be moved and clamped; for the other wire a narrow-edged felt damper, also capable of being moved and clamped.

(Rd. No. 420,297.). This Instrument has been designed to meet the requirements of Students and others who find the need of a Barometer which will give exact readings, and cost but a moderate sum.

It appeals especially to Colleges and Schools for Demonstration purposes.

The construction is on that of the well-known" Fortis" principle. The level of the cistern mercury is reducible to zero, in exactly the same manner as in the more expensive forms.

The diameter of the mercurial column is '25 inch, and affords a bold, well-defined reading. The scales, by means of the double vernier, are capable of being read to 'or inch and '1 millimetre. It is mounted on a wellpolished, solid mahogany board, with plates for attach. ment to wall, opal glass reflectors for reading off, and screws for vertical adjustment.

The metal portions are all well bronzed and lacquered, and the scales are silvered brass.

Ve confidently recommend this Instrument for use as a " Standard in Colleges and Schools, private Observatories, and by Gas and other Engineers. Price, complete, mounted as illustrated,

£3 7 6 each, or may be had with one scale (either inches or millimetres), and with thermometer on other scale, at sabe price.

I Nature says :-"Provides an accurate instrement at & moderate cost.'

FULL SIZE STANDARD BAROMETER of same design, bore o'5" diameter, inches and milimetre scales, verniers reading to o'002 inch and o'r m'n, on polished mahogany board with brackets and opal glass reflectors, £7 10 0 Sole Manufacturers and Proprietors of the

Registered Design. PASTORELLI & RAPKIN, LTO.

46 HATTON GARDEN, LONDON, E.C. WHOLESALE MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS.

Contractors to H.M. Government. Estd. 1750 Telegrams," Rapkin, London." Telephone, 1981 Holbore

Price £4 10 0.

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REYNOLDS & BRANSON, LTD, W.H. SMITH & SON'S &

LIBRARY

Sole authorised makers of the STROUD & RENDELL
LANTERN, as made by us for the leading Universities.

SCIENCE

AND

NEW SCIENCE LANTERN for 1905. 186 STRAND, LONDON, W.C.,

and at the A reliable Lantern for all purposes, made entirely of Copper

and Polished Brass. It presents a very attractive appearance. RAILWAY BOOKSTALLS, The optical parts are carefully selected, and of superior quality.

to which the books are forwarded The open stage is well suited for shewing apparatus.

to subscribers' orders carriage free. IT EMBRACES ALL THE MOST IMPORTANT BOOKS,

BIOGRAPHIES AND MEMOIRS, TRAVEL AND SPORT, PRICE

With
HISTORY, THEOLOGY,

SOCIOLOGY, 4 in Condenser NATURAL HISTORY, LITERATURE AND ART, POETRY £4 10s.

and Compound

AND ESSAYS, TOPOGRAPHY, FICTION, REVIEWS,

AND MISCELLANEOUS WORKS. LANTERN

Objective. ONLY.

6" or 9" focus. NEWEST & BEST BOOKS ADDED AS PUBLISHED

Over 800 Branches to which Subscribers may be transferred.
NERNST BURNER, extra, from 19/6.

Terms and Particulars on application.
LIME-LIGHT BURNER, extra, from 7/6.
ARC LAMP, extra, from 30/-

Many Thousands of SURPLUS LIBRARY BOOKS
Delivery froin Stock.

and VALUABLE NEW REMAINDERS OFFERED

AT GREATLY REDUCED PRICES. The above Lantern can be supplied fitted complete as a

Works of Standard Interest in all branches of General STROUD & RENDELL LANTERN, all in Metal or Wood, Literature, suitable for Students, Institutions, Libraries, complete with Prisms, £8.

Presents, &c., Carriage Free to any of the Railway

Bookstalls. Write for Particulars, also Catalogue of Lantern Slides. MONTHLY CATALOCUE (150 PACES) FREE ON APPLICATION.

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14 Commercial Street, LEEDS. FAB. 186 STRAND, LONDON, W.C.

,

OFFICE:

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