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CRYSTALLOGRAPHY. WATKINS & DONCASTER,

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Our New Catalogue, XIX., with many illustrations, has just come out (post free on application).

The following are included : 1. New Collection of 416 Crystal-models of wood, containing

ibe crystal forms and combinations represented by illustrations in the 4th ed. of the " Physikalische Kristallographie," by Prof. P. Groth (1995) at Munich

£27 10 0 2. Large Collection of 916 Crystal-models of wood to illustrate the crystal forms of the minerals, by Prof. C. Hintze at Breslau.

£90 00 3. New Collection of 8 Trigonal-Glass-models of Calcite, with the crystallographic axes according to Bravais

(Weiss) and with the axes according to Miller, constructed by Prof. J. Beckenkamp at Wurzburg ...

£1 15 0 4. New Collection of 450 Crystal-models of pasteboard, sys

tematically arranged according to the 32 classes of symmetry, by Prof. K. Vrba at Prague

£48 0 0 5. The Planes of Symmetry, 5 models constructed by Prof. K. Vrba at Prague

£5 15 0 6. The Optical Wave Surfaces, 4 wire-models constructed by Prof. K. Vrba at Prague ...

£6 8 0 7. The Optical Indicatrix, 3 wire-models by Prof. K. Vrba at Prague

£2 5 0 8. The Seiodromes, 5 coloured plaster-models constructed by Prof. F. Becke at Vienna

£5 00 Stands for Crystal models, various constructions and in various

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, refer.
ences are permitted to distinguished patrons, Museums, Colleges, &ć.
A LARGE STOCK OF INSECTS, BIRDS' EUGS 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.) CATALOGUE (102 pp.) POST FREE.

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Dr. F. KRANTZ,
RHENISH MINERAL OFFICE, BONN.ON-RHINE, GERMANY.

ESTABLISHED 1833.

Mecker
Bunsen Burner

(A WONDERFUL INVENTION).

BECKER,
Hatton Wall,

LONDON.

Collections and Single Specimens of MINERALS, NATURAL CRYSTALS,

PRECIOUS STONES, ROCKS & FOSSILS. Cabinets, Geologists' Hammers, Card Trays, Glass Capped Boxes, Wood and Glass Models of Crystals and Precious Stones, Sections of Rocks, and other Apparatus.

NEW CATALOGUES POST FREE,

LIVING SPECIMENS FOR

THE MICROSCOPE.

THOMAS D. RUSSELL, 78 Newgate Street, LONDON, E.C.

Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinospbærium, Vorticella, Stentor, 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.

Pure
Chemicals.

BECKER,
Hatton Wall,

LONDON.

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

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

THE DIRECTOR.

1

1 TO

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NOTICE.-Advertisements and business letters for NATURB should be addressed to the Publishers; Editorial
Communications to the Editor. The telegraphic address of NATURE is “ PHUSIS," LONDON.
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Printed by RICHARD CLAY AND Sons, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street in the City of London, and published. cy MACAN LAS

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Naturo trusts the mind which builds for aye."- WORDS WORTH.
No. 1910. VOL. 741

THURSDAY, JUNE 7, 1906 [Price 15 CENTS
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.

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PRACTICAL NOTES ON
TELEPHOTOGRAPHY,

Free on application to
R. & J. BECK, Ltd., 68 CORNHILL, LONDON.

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SEPTEMBER

MATRICULATION.

BIRKBECK COLLEGE,

UNIVERSITY TUTORIAL COLLEGE

O.

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BREAMS BUILDINGS, CHANCERY LANE, E.C.

FACULTY OF SCIENCE. Day and Evening Classes for the September Matriculation

DAY AND EVENING COURSES, under Recognised Teachers of of London University may be taken up at any time, as the

the University of London. Classes at

(Alex. McKenzie, Ph.D., D.Sc., Chemistry

M.A.
H. VNEN, Ph.D., B.A., B.Sc.

ALBERT GRIPPITHS, D.Sc
Physics ...

D. OWEN, B.A., B.Sc.

B. W. Clack, B.Sc.
Fifty-two

Mathematics work continuously through the Summer vacation.

JE. H, SMART, M.A.

TC. V. COATES, M.A. successes at January Matriculation.

Botany

A. B. RENDLE, M.A., D.Sc.

F. E. FRITSCH, Ph.D., D.Sc. Classes in

H. W. UNTHANK, B.A., B.Sc. PRACTICAL CHEMISTRY, PHYSICS, Zoology.

Geology & Mineralogy Geo. F. HARRIS, F.G.S. BIOLOGY AND GEOLOGY are held during August. Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M.

RESEARCH in Chemistry and Physics ia well-equipped laboratories. Prospectus may be had, post free, from the VICE-PRINCIPAL,

French, German, Spanish, Russlan, and Itallan Classes,

EVENING CLASSES in Biology, Physiology, Practical Geometry, University Tutorial College, Red Lion Square, Holborn. Building and Machine Construction, Tbeoretical Mechanics, Applier

Mechanics and Mechanism, Land and Quantity Surveying.

Calendar 6d. (post free 8d.), on application to the SECRETARY. BRITISH ASSOCIATION FOR THE

B.A. AND B.Sc. EXAMS. ADVANCEMENT OF SCIENCE.

MATRICULATION, INTERMEDIATE, FINAL.
ANNUAL GENERAL MEETING, YORK,

PREPARATION by CORRESPONDENCE (Residence abroad mo
AUGUST 1 TO 8.

impediment) or ORAL TUITION on a THOROUGHLY INDI

VIDUAL SYSTEM. Fees based on success. Members are requested to make early intimation to the Local Secretaries

The STAFF includes Graduates of Oxford, Cambridge, London, and at York of their intention to be present.

Royal Universities, Science Medallists, Prizemen, Scholars, &c. New Members and Associates may now be enrolled, on application to the

SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, Local Secretaries (Davy Hall Chambers, York), who will supply insor. mation in regard to the arrangements for the Meeting, lodgings, &c., or at

Psychology, Political Economy, Latin, Greek, French, German, &c. the Office of the Association.

For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oxon.). A. SILVA WHITE,

Burlington Correspondence College, Clapham Common, London, S.W. Burlington House,

Assistant Secretary. Piccadilly, London, w.

MILLPORT BEDFORD COLLEGE FOR WOMEN.

MARINE BIOLOGICAL STATION. (UNIVERSITY OF LONDON.)

The Director is prepared to consider applications for the YORK PLACE, BAKER STREET, W.

following Appointments now vacant. In each case the terms A Clift-Courtauld Scholarship in Arts, value 631 103. first year, 428 75. of engagement will depend upon the qualifications of the second and third years; a Pfeiffer Scholarship in Science, annual value selected candidate. 448, tenable for three years; a Deccan Scholarship in Arts, annual value £40, tenable for three years; a Deccan Scholarship in Science, annual

(1) ZOOLOGIST to assist in carrying on systematic value £60. tenable for three years; will be awarded on the results of the

research on the fauna of the Clyde sea-area. Examination to be held at the College beginning on June 27 For further information apply to the PRINCIPAL.

(2) LABORATORY ASSISTANT, or smart youth with

taste for Natural History. DEPARTMENT FOR PROFESSIONAL TRAINING IN

(3) Trustworthy LADY CLERK 10 act as Director's TEACHING

Secretary Students are admitted to the Training Course in October and January.

All communications to be addressed to THE DIRECTOR, The Course includes full preparation for the examinations for the Teaching Diplomas granted by the Universities of London and Cambridge.

Marine Station, Millport, N.B. Two Deccan Scholarships, each of the value of £22 10s., and two Scholar. ships, each of the value of £20, will be offered for the Session beginning MUNICIPAL TECHNICAL SCHOOL, October, 1906. Candidates must hold a degree or an equivalent. Applications must reach the Head of THE DEPARTMENT not later

PORTADOWN. than July 2.

The services of a TEACHER of ENGINEERING SUBJECTS are required for the coming Session. commencing September 1. The work is

partly day and partly evening, totalling 27 hours per week. The subjects BEDFORD COLLEGE FOR WOMEN. are those immediately allied to Mechanical and Electrical Engineering,

and the examinations are those of the S. and A. Dept, and the City and (UNIVERSITY OF LONDON.)

Guilds of London Inst. Candidates will be expected to be qualified to

earn grants under the S. and A. Dept., and to be registered for at least one YORK PLACE, BAKER STREET, W.

subject under the City and Guilds Inst. Salary offered is 6120 to 6130, The Council offer TWO RESEARCH SCHOLARSHIPS, each of the

according to qualifications and experience.

Applications, stating training, experience, teaching experience, if any, value of 650, one in Physiology, one in Zoology, for the Session 1906-7 only. Applications should be sent by June 20 to the PRINCIPAL, from

with copies of three recent testimonials, should be sent to the undersigued whom further information can be obtained.

by June 15.

W. M. CLOW, Hon. Sec.

ROYAL SOCIETY OF LONDON.

INDIAN AGRICULTURAL
MACKINNON RESEARCH STUDENTSHIPS.

DEPARTMENT.
There are two Studentships each of the value of £150. One of them is

The Secretary of State for India in Council invites applications for

TWELVE APPOINTMENTS in the INDIAN AGRICULTURAL awarded for research in the group of the Physical Sciences, including Astronomy, Chemistry, Geology, Mineralogy and Physics ; the other

DEPARTMENT, for which five all-round Agriculturists, three Agricul

tural Botanists, and four Agricultural Chemists are required. Candidates awarded for research in the group of the Biological Sciences, including

should possess a University Honours Degree, or recognised diploma m Anatomy, Botany, Palæontology, Pathology, Physiology and Zoology.

agriculture, agricultural botany, or agricultural chemistry, as the case may The Studentships are awarded annually for one year, but are renewable be, and should not be under 23 or over 30 years of age. Applications for a second year. Under exceptional circumstances they may be renewed should be received before the end of June. Further particulars and for a third year. The Studentships are restricted to British subjects. application forms may be had from the SECRETARY, Revenue Department,

Applications must be received not later than June 22. Further particulars India Office, S.W. and forms of application can be obtained from the Assistant SECRETARY India Office, London,

NOTICE.

APPARATUS

N T
N A T U R E

RE

made of

GLASS & QUARTZ

PLATES . FOR SPECTROSCOPY AND ASTRONOMY.

WRATTEN & WAINWRIGHT, 170.,

G. BOW RON,

Of THURSDAY Next, JUNE 14, will contain the
INDEX

and all kinds of
to VOL. LXXIII., and be published at

SCIENTIFIC GLASS-BLOWING. ONE SHILLING. • Advertisements intended for insertion in this number OTTO BAUMBACH should reach the Publishers by the morning of Tuesday, June 12.

(Glass-Blower by Appointment to the University

of Manchester), OFFICE OF “NATURE,”

10 Lime Grove,

Grove, Oxford Road, ST. MARTIN'S STREET, LONDON, W.C.

Manchester. UNIVERSITY OF ABERDEEN.

APPOINTMENT OF EXAMINERS. The UNIVERSITY COURT will, at a MEETING in JULY, proceed to appoint an additional EXAMINER in each of the following Subjects, viz. :) Botany, (2) Chemistry.

Applications, along with fifteen copies of testimonials (should the candidale think fic to submit any), are to be lodged with the SECRETARY on or before 300 prox.

ROBERT WALKER,
University of Aberdeen,

Sec. Univ. Court.
June 2, 1906.
BLACKBURN MUNICIPAL

The Pinachrome and Pinacyanol Bathed Plates
TECHNICAL SCHOOL.

are far more colour-sensitive than any previous

plate, and have a very fine grain. Special plates ASSISTANT LECTURER required on the Science side in September. Sabjects : Pure Physics and some Mathematics, Time allowed for can be made to suit special work. Research. Salary. 2120, rising to £140 by annual increments of £10. Applications to be forwarded not later than June 12 to the DIRECTOR OF

Write for the S Booklet.
EDUCATION, Education Offices, Library Street, Blackburn, from whom
details of duties may be obtained.

WOOLWICH POLYTECHNIC.
The Governors of the Woolwich Polytechnic invite applications for the

CROYDON. following appointments :

1. LECTURER in CHEMISTRY. Commencing salary, 6180 per annum.

2. LECTURER in PURE and APPLIED MATHEMATICS. Com. mencing salary, 4180 per apoum.

Further particulars may be obtained from the PRINCIPAL (on receipt of a 57 EDGWARE ROAD, LONDON, W. stamped and addressed envelope), to whom applications should be forwarded not later than Jude 30.

has always on hand a large and varied stock of BEDFORD COLLEGE FOR WOMEN.

(UNIVERSITY OF LONDON.) YORK PLACE, BAKER STREET, W.

ELECTRICAL

AND PHYSICAL The Council are about to appoint an ASSISTANT in MATHEMATICS, salary 6100, and a JUNIOR DEMONSTRATOR in PHYSICS, salary

BY STANDARD MAKERS, IN PERFECT WORKING ORDER, AT 215. for the Session 1906-7. Applications, from women only, with testi.

EXTREMELY MODERATE PRICES. modials, to be sent by June 20 to the Principal, from wbom particulars can be obtained.

As supplied to the National Physical Laboratory; Aberdeen, Aberystwyth,

Birmingham, Nottingham and Glasgow Universities ; Bedford, Bradford, BEDFORD COLLEGE FOR WOMEN.

Clifton, Heriot Watt and Yorkshire Colleges; and twenty other Scientific

Institutions, Polytechnics, &c. (UNIVERSITY OF LONDON.)

1 Nature says : " Teachers requiring efficient apparatus at a low YORK PLACE, BAKER STREET, W.

cost for lecture or laboratory purposes, might consult the list with

advantage." The Council are about to appoint a DEMONSTRATOR in CHEMIS.

List on application by mentioning NATURE. TRY. Applications, with testimonials, to be sent in by June 20 to the SECRETARY, from whom particulars can be obtained. HILDA WALTON, Secretary. ALEMBIC AUTOMATIC STILL, .

As used in the KING'S COLLEGE, LONDON.

Pharmaceutical Society, (UNIVERSITY OF LONDON.)

Bloomsbury Square. The Council invite applications for the post of SENIOR LECTURER

We guarantee this to proin PHYSICS. Applications should be sent in by Friday, June 15. For

duce 6 pints of aqua dest. conditions apply to WALTER SMITH, Secretary.

Total cost of gas, id. per

gallon. OWEN'S SCHOOL, ISLINGTON.

To make Aromatic Waters PHYSICS MASTER required in September, fully qualified, good

and the recovery of Alcohol experience. Also FORM MASTER to teach English, Elementary

38/6 Nett. Mathematics, jantor French and German on the oral method ; graduate

Size to produce 2 gallons with good experience. The salaries generally commence at £150. Apply

per hour, £3 15s. al once to the HEADMASTER, giving full particulars of qualifications and

Pamphlets on application. experience, and copies of three recent testimonials.

BROWN & SON, TO SCIENCE AND MATHEMATICAL

Engineers, Coppersmiths, MASTERS.- Immediate and September Vacancies.-Graduates and

and Joiners, other well qualified Masters seeking posts in Public and other Schools

Muriel St., & Charlotte should apply at once, giving full details as to qualifications, &c., to Meurs. GRIFFITHS, SMITH, Powell & SMITH, Tutorial Agents

St., London, N. (Estd. 1333), 34 Bedford Street, Strand, London. Immediate notice

Laboratory Furnishers

SECOND-HAND

APPARATUS

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per hour.

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