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ON SALE.

Astronomical Telescope, with 4 in. clear aperture, altazimuth stand, I day and 4 astronomical eyepieces, price only £17; others cheaper.Microscopes, second-hand by ZEISS, with substage and Abbé condenser, 2 eyepieces, 2 objectives and triple nosepiece, for £9. Another by PILLISCHER, with mechanical stage, substage-condenser and Iris-daphragm, 3 eyepieces, 3 objectives, viz.: 1", ", &" oil immersion, price only £6 10s. Another by PoWELL & LEALAND, with mechanical stage, substage-condenser, and seven objectives all " P and L," offered for £10. Binocular Microscope by SWIFT, cost £40, offered at £10. Another by STEWARD, with mechanical stage, 2 objectives, double nosepiece, &c., £6. Assay Balance by OERTLING, 6 in. beam, double columns, sensitive to milligram, double rider. ccst £25. offered at £6. Others in Stock. 20 ft. Hydrogen Cylinder (charged), price £1. Scientific Lantern Slides on every subject at 5d. each. Microscope Slides on approval at 4d. each.

Rev. H. MILLS, Greenside, Kendal.

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MACMILLAN & CO.'S

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1905 ISSUE NOW READY.

STATESMAN'S

YEAR-BOOK.

Statistical and Historical Annual of the States of the World for the Year 1905. Edited by J. SCOTT KELTIE, LL.D., Secretary to the Royal Geographical Society.

CROWN 8vo. 10s. 6d. NET

A MANUAL OF QUATERNIONS.

By CHARLES JASPER JOLY, M.A., D.Sc., F.R.S., Sec. R.I.A.;

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ELECTROMAGNETIC THEORY OF LIGHT.

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APRIL 20, 1905]

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Gentlemen interested in the above study are invited to send to
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Subscription in advance, either Monthly, 7/-; Quarterly, 21/r for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.

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GRATIS AND POST FREE.
Scientifically arranged Catalogue of Megascopic and Microscopic
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Sample Slide of expertly prepared ROCK SECTION, 1/-, post free.
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Full particulars of above and other forms of ELECTRICAL MEASURING
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ISENTHAL & CO.,

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C. E. MÜLLER, ORME & CO.'S

NEW

RESISTANCE

GLASS

excels Jena Glass in its power to stand sudden variations of temperature.

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

1

IT IS AS CHEAP AS THE COMMON BOHEMIAN GLASS.

May be had in BEAKERS (various forms), FLASKS (all shapes), TUBING (any size).

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THE LONDON STEREOSCOPIC COMPANY'S

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LATEST INTRODUCTION

The "Artist" Reflex Camera

For Day-Light Loading Flat Films or Plates.
The Ideal Camera for Photographing Figure Studies, Animals, Natural History
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The picture can be viewed the full size and focussed right up to the moment
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Write for Fully Illustrated Booklet (N) Free from

106 & 108 REGENT ST., W., or 54 CHEAPSIDE.

Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MA. MILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, April 20, 1905

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"DEMONSTRATOR'S"

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The "BIRDLAND"
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BEST PATTERN.
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[All Rights are Reserved.

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Rio de Janeiro,
Nov. 7th, 1904.
Messrs. Sanders & Crowhurst,
London.

To

Gentlemen,

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I have much pleasure in writing to inform you that my "Birdland" Camera is proving a great success in the tropical heat of this country.

As you know I was feeling a little doubtful when I left England, as to how the camera would stand all the great climatic changes that it would have to pass through with me on my travels. However, it has come through with flying colours, and has not once failed me. Moreover it has enabled me to obtain a large number of successful negatives that could only have been gained with the aid of a reflex camera. Your faithfully, (Signed) F. MARTIN-DUNCAN.

Birdland Booklet post free to readers of NATURE.
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EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS

of British manufacture, in the large hall of the Northampton Institute, during the Convention, open daily from 12 to 10 p.m. In connection with this, a catalogue is in preparation, which will be a useful work of reference in regard to instruments manufactured in this country.

The Subscription for Membership of the Convention will be five shillings. Applications for membership should be acdressed to the Hon. Sec., Mr. F. J. SELBY, M.A., Elm Lodge, Teddington, Middlesex, who will be glad to furr ish further particulars if desired. ADMISSION to the Exhibition, daily, ONE SHILLING, after 7 p.m., Sixpence. Tickets admitting to the Exhibition at any time while it is open, 2/6.

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ALBEMARLE STREET, PICCADILLY, W. MONDAY, May 1, at Five o'clock, Annual Meeting of the Members. TUESDAY, May 2, at Five o'clock, Professor L. C. MIALL, D.Sc., F.R.S., first of Three Lectures on The Study of Extinct Animals.' Half-a-Guinea the Course.

THURSDAY, May 4 at Five o'clock, Professor SIR JAMES DEWAR, M.A., LL D., D.Sc., F.R.S., first of Three Lectures on "Flame." Half-a-guinea.

SATURDAY, May 6, at Three o'clock, Professor MARSHALL WARD, D.Sc., F.R.S., first of Two Lectures on "Moulds and Mouldiness." Half-a-Guinea.

Subscription to all the Courses in the Season, Two Guineas. FRIDAY EVENING, May 5. at Nine o'clock, Professor HENRY E. ARMSTRONG, Ph. D., LL. D., F.RS, on "Problems Underlying Nutrition." (UNDER THE AUSPICES OF HIS MAJESTY'S GOVERNMENT.) THE LONDON SCHOOL OF TROPICAL MEDICINE.

(UNIVERSITY OF LONDON.) CONNAUGHT ROAD, ALBERT DOCK, E.

(IN CONNECTION WITH THE HOSPITALS OF THE SEAMEN'S HOSPITAL SOCIETY.)

The next SESSION commences on MONDAY, MAY 1, 1905.
For Prospectus, Syllabus, and other particulars, apply to the Secretary,
P. MICHELLI, Esq., Seamen's Hospital, Greenwich, S.E.

BACTERIOLOGY and PATHOLOGY.
LONDON.

KING'S COLLEGE,

Director-R. T. HEWLETT, M.D., Professor of Bacteriology.
Demonstrator of Bacteriology-H. S. WILLSON, M.B.

The Laboratories are open daily from April 26 for instruction and research in Pathology, Bacteriology, and Public Health.

Students may enter at any time.

A Course in Clinical Bacteriology suited to the requirements of senior students for the M.B. degrees will be held on Tuesdays and Thursdays during the summer session. Fee £5 55.

For Syllabus apply to the SECRETARY or to Prof. HEWLETT,

BIRKBECK COLLEGE.

BREAMS BUILDINGS, CHANCERY LANE, E.C.

FACULTY OF SCIENCE.

Chemistry

Physics ...

Mathematics

Botany...
Zoology...

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JJ. E. MACKENZIE, Ph.D., D.Sc. H. WKEN, Ph.D., B.A., B.S ALBERT GRIFFITHS, D.Sc.

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

B. W CLACK, B.Sc.

E. H. SMART, M.A.

W. G. BIRT, B.A., B.Sc.

A. B. RENDle, M.A., D.Sc.

F. E. FRITSCH, Ph.D., B.Sc. H. W. UNTHANK, B.A, B.Sc. Geology & Mineralogy GEO. F. HARRIS, F.G.S. Assaying, Metallurgy & Mining. GEO. PATCHIN, A.R.S.M RESEARCH in Chemistry and Physics in well-equipped laboratories. French, German, Spanish, Russian, Dutch, & Italian Classes. EVENING CLASSES also in Biology, Physiology, Practical Geometry. Building and Machine Construction, Steam, Theoretical and Applic Mechanics, Land and Quantity Surveying, and Estimating.

Calendar 6d. (post free 8d.), on application to the SECRETARY.

At the SOUTH-WESTERN

POLYTECHNIC,

Manresa Road, Chelsea, S. W., Day College Courses of thirty hours per week are conducted in preparation for the London University Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemis try, Physics and the Natural Sciences. The composition fee for the Session of three terms, 1904-1905. is £15. These Courses are recog nised for "Internal Students of the University, and consist of lecture and laboratory instruction. The Courses are conducted byMECHANICAL ENGINEERING, W. W. F. Pullen, A. Mack'om Smith: ELECTRICAL ENGINEERING, A J. Makower, CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe: MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister and L. Lownds; BOTANY, H. B. Lacey and T. G. Hill; GEOLOGY, A. J. Maslen. In the evenings similar Courses will be conducted, but at La per Session. Also TECHNICAL DAY COURSES of three years' duration are arranged as a preparation for the Engineering, Electrical and Chemical and Metallurgical pro fessions. The Laboratories and Workshop are open for RESEARCH under the direction of The Principal and the Heads of Departments.

Further particulars may be obtained on application to The SECRETARY, who will send either the Day College Prospectus am Calendar or the Evening Class Prospectus for 3d. The Prospectuses may be had at the Office for id. each.

B.A. AND B.Sc. EXAMS.

MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE and ORAL TUITION on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based o

success.

The STAFF includes Graduates of Oxford, Cambridge, London, Royal Universities, Science Medallists, Prizemen, Scholars, &c. SINGLE SUBJECTS TAKEN: Science, Mathematics, Lope Psychology, Political Economy, Latin, Greek, French, German, &c. For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond, and Oxoni Burlington Correspondence College, Clapham Common, London, S.W. UNIVERSITY OF BIRMINGHAM. FACULTY OF SCIENCE.

PROFESSORSHIP OF CIVIL ENGINEERING. The Council of the University wish to elect a Professor of Civi Engineering to co-operate with the Professors of Mechanical and Electrica Engineering. He will have charge, with an assistant, of the teaching of Surveying, Strength of Materials, Hydraulics, and other branches of Civil Engineering, and will superintend the laboratories for Hydraulics and Strength of Materials.

The Stipend will be £600 a year.

The Professor will be allowed to take Higher Consultative work, to keep in touch with Civil Engineering practice, provided that it does not interfere with his University duties.

Applications, accompanied by seventy five copies of testimonials, shoe be received by the Secretary, not later than May 20.

The successful Candidate will be expected to begin his duties October 2, 1905.

Further particulars may be obtained from

GEO. H. MORLEY, Secretary

UNIVERSITY OF LONDON. WILLIAM LINDLEY STUDENTSHIP. A Research Studentship Physiology of the value of £100 for one year, founded in memory of the late William Lindley and tenable in the Physiological Laboratory of the University, is now vacant. Applications, accompanied by a summary of the career of the applicant and the names of three persons to whom referen may be made, will be received by the undersigned on or before Mondar May 8 next. A. W. RÜCKER, Principal

University of London, South Kensington, S.W.

For other Scholastic Advertisements, see page coxly.

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