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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 DEPART-
MENT 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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increasing, after approved service, by annual increments of 25 to 350 PATENT VACUUM PUMP

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for producing the
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Prices and particulars on applica
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London, E.C.

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

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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ENGLISH CATALOGUE

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POST FREE ON APPLICATION.

OF MILAN.
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MAN

London: ROYAL GEOGRAPHICAL SOCIETY, Kensington Gore, S.W., and EDWARD STANFORD, LTD., 12, 13, & 14 Long Acre, W.C. 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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NOTICE.

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*** For Subscription Rates see p. vii.

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

MANSFIELD'S

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For Advertisement Rates, Terms of Subscriptions, &c., see page vii of the present issue of "Nature."

Attention is directed to some of the topical articles which have
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War" (October 22); "Science and the State" (October 29);
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Synthetic Drugs in Great Britain" (January 28); "The Manu-
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number will be sent by post on receipt of its published price,
plus postage.

66

99

OFFICE OF "NATURE," ST. MARTIN'S STREET, LONDON, W.C.

99

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The University" Lantern, with Russian 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 O 7 6

without reversible adjustable table... Ditto, ditto, with "Phoenix arc lamp Reversible adjustable table "B" for supporting apparatus,

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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,

D.Sc. (Birm.),

Ph.D. (Göttingen), B.Sc. (Lond.), F.1.C.

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

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COAL-TAR PRODUCTS

Their Chemistry, Manufacture and Application. Including Chapters on Modern Inks, Photographic Chemicals, Synthetic Drugs, Sweetening Chemicals, and other Products

derived from Coal-tar.

BY

THOMAS BEACALL, B. A. (Cambridge),

F. CHALLENGER, Ph.D., B.Sc.,

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.

For the convenience of readers of NATURE wishing to inspect books published abroad which have been reviewed in NATURE it has been decided to keep such volumes for the period of six months at the publishing office of the journal. The books will be retained for the purpose of examination free of charge. The display of books began with those reviewed in NATURE of January 7.

St. Martin's Street, London, W.C.

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