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UNIVERSITY OF LONDON.

Applications are invited from Men Graduates of British Universities for a Secretaryship in the University of London. Preference will be given to Graduates of that University between the ages of 25 and 30. Salary £250, rising by annual increments of 10 to a maximum of £300. The candidate appointed will be required to join the University Pension Scheme. Requests for printed forms of application and further particulars should be marked on the outside "Secretaryship," and should be accompanied by an addressed foolscap envelope. The last day for receiving applications is Thursday, March 18, 1915. HENRY A. MIERS, Principal.

University of London, South Kensington, S. W.

PORTSMOUTH MUNICIPAL

COLLEGE.

APPOINTMENT OF VICE-PRINCIPAL AND HEAD OF THE CHEMISTRY AND NATURAL SCIENCE DEPARTMENT. Applications are invited for the position of VICE-PRINCIPAL and HEAD of the CHEMISTRY and NATURAL SCIENCE DEPARTMENT of the Portsmouth Municipal College.

Candidates must have special qualifications in Chemistry and Natural Science, and preference will be given to those holding Degrees in Arts as well as in Science. The salary will be at the rate of £300 per annum,

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£6 15

Leitz 11b, 2 eyepieces, 3 and 7 objectives, double nosepiece, spiral Abbe and iris Watson "Fram," 1 eyepiece, 1 and 1/6 objectives, double nose piece, spiral Abbe and iris ... Many others. Also Objectives, Eyepieces, Double and Triple Nosepieces, Condensers, Lamps, Spectroscopes, Microtomes, Cabinets, &c. SECOND-HAND TELESCOPES. 4-in. Wray, mounted on massive oak lath stand with stretchers, horizontal and vertical movements by Hooke's joint, slow motions, large finder, 4 astro. and I day eyepieces...

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increasing, after approved service, by annual increments of £25 to £350 PATENT

per annum.

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DENT'S ASTRONOMICAL CLOCKS SIDEREAL OR MEAN TIME CLOCKS FOR OBSERVATORIES £21 & UPWARDS

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Nature says: "Should find its way into many observatories where an accurate instrument is required at a moderate cost. For the sum of £21 they supply a clock with a 10-inch dial, dead-beat escapement, and wooden rod seconds pendulum in a solid mahogany case, and after examining the instrument we have no hesitation in pronouncing it a marvel of cheapness."

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Only Addresses

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AND 4 ROYAL EXCHANGE, LONDON. 43 Grand Prizes and 1 Gold Medal Franco-British Exhibition.

OLD PLATINUM, GOLD

Dental Alloy, Scrap, &c.,
valued or purchased.

SPINK & SON, Ltd.,

17 & 18 PICCADILLY, LONDON, W.

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EST. 1772.

Gems for experimental work at moderate prices.

ENGLISH CATALOGUE

KORISTKA

OF MILAN. Depot: H. F. ANCUS & CO.,

83 WICMORE ST., W.

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An illustrated monthly record of
Anthropological Science, 1/- per part,
10/- a year, post free anywhere.
CONTENTS OF MARCH ISSUE.

ORIGINAL ARTICLES: Pre-Bantu Occupants of East Africa.-Music: Tones in Ibo. Stone Implements. Baluchistan. Annuak Fable.Darcing in Stone Circles.-Obituary of Frederick William Rudler. (With Plate C.)-Dinka Songs.-REVIEWS: Etude sur la Phonétique Historique du Bantu -Ten Years' Diggings in Lenape Land, 1901-1911.-Comparative Studies: A Contribution to the History of Cochin.-Étude Anthropologique des Populations des Régions du Tchad et du Kanim. - Etudes Bakango.

London: The Royal Anthropological Institute, 50 Great Russell St. General Agent: FRANCIS EDWARDS, 83 High Street, Marylebone, Lord n, W.

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The University" Lantern, with Russian iron body, sliding baseboard, two superior objectives, with rack and pinion for focussing, condensers 4 in. diam., plane silvered mirror "A," which is moved by a knob causing the rays to be reflected upwards for the projection of objects in a horizontal plane, silvered prism which can be used at 'C," or as an erecting prism in mount "D," limelight burner, slide carrier. Price complete in travelling case, £10 7 6 11 15 0 7 6

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JUST PUBLISHED. Med. 8vo. 368 Pages, with numerous Illustrations. Price 10s. 6d. net.

THE CHEMISTRY OF

PETROLEUM AND ITS SUBSTITUTES

A Practical Handbook.

By C. K. TINKLER, and F. CHALLENGER,
Ph.D. (Göttingen),
B.Sc. (Lond.), F.1.C.

D.Sc. (Birm.),

B.Sc. (Lond. and Wales). Lecturers in Chemistry, The University of Birmingham. With an INTRODUCTION by Sir BOVERTON REDWOOD, Bart. D.Sc., F.1.C., in which the following remarks occur :

"It is impossible to read the excellent handbook on the Chemistry of Petroleum and its Substitutes,' by Drs. C. K. Tinkler and F. Challenger, without being impressed with the scope which exists for the application of science in the treatment of Petroleum.

"The authors have aimed primarily at providing a text-book for students who require to become proficient in the chemical technology of petroleum, and they have admirably achieved their object by a skilful association of theory and practice."

JUST PUBLISHED. 162 Pages, with Diagrams and Illustrations. Royal 8vo. Cloth. Price 7s. 6d. net.

DYESTUFFS

AND

COAL-TAR PRODUCTS

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BY

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GEOFFREY MARTIN, Ph.D., M.Sc., B.Sc., and HENRY J. S. SAND, D.Sc., Ph. D.

London: CROSBY LOCKWOOD & SON 7 Stationers' Hall Court, Ludgate Hill, E.C.. and 5 Broadway, Westminster, S.W.

JUST PUBLISHED.

A BOOK of importance to all CHEMISTS, PHYSICISTS, BIOLOGISTS & BACTERIOLOGISTS.

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W. W. TAYLOR, M.A., D.Sc., Lecturer in Chemistry at the University of Edinburgh.

With 22 Illustrations; viii+328 pages; Crown 8vo, cloth, 7s. 6d. net.

This book aims at presenting, simply and yet fully, the chief properties of colloids-the methods of preparation (including surface energy, surface tension, surface concentration and absorption); while in a final section some technical and biological applications are discussed. Mathematics, unavoidable in the treatment of electrical properties and of surface concentration, and hypothesis are subordinated to a clear presentation of the experimentally-ascertained facts.

LONDON EDWARD ARNOLD, 41 & 43 MADDOX ST., W.

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NOTICE.

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