departments closely in touch with scientific work are represented—e.g. Imperial Institute; Meteorological Office; National Physical Laboratory; Royal Observatory, Greenwich; Geological Survey; Royal Botanic Gardens, Kew; Rothamsted Experimental Station, etc.; and we thank the Officials for these particulars.

The Synopsis of Contents shows the wide range of interests served, and “reviewers" for the scientific and technical press will find much to interest them by a careful consideration of the Section they are concerned with.

Copies of the Yearly Volumes may, for the most part, be obtained by anyone or any Society needing to complete sets, and the volumes will be found to be indexed for easy reference.

LONDON, November 1921.

C. G. & CO., LTD.

SYNOPSIS OF CONTENTS.

§ 1. SCIENCE GENERALLY: i.e., Societies occupying themselves with

several branches of Science, or with Science and Literature jointly,

§ 2. ASTRONOMY, MATHEMATICS, and PHYSICS,

§ 3. CHEMISTRY and PHOTOGRAPHY,

§ 4. GEOGRAPHY, GEOLOGY, and MINERALOGY,

§ 5. BIOLOGY, including MICROSCOPY and ANTHROPOLOGY,

§ 6. ECONOMIC SCIENCE and STATISTICS,

§ 7. MECHANICAL SCIENCE and ARCHITECTURE,

§ 8. NAVAL and MILITARY SCIENCE,

§ 9. AGRICULTURE and HORTICULTURE,

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YEAR-BOOK OF THE SCIENTIFIC AND LEARNED SOCIETIES

OF GREAT BRITAIN AND IRELAND.

COMPILED FROM OFFICIAL SOURCES.

"British Societies are now WELL REPRESENTED in the Year-Book of the Scientific and Learned Societies of Great Britain and Ireland'" (Art. Societies in the New Edition of the Encyclopædia Britannica, vol. xxii.)

"The YEAR-BOOK OF SOCIETIES is a Record which ought to be of the greatest use for the progress of Science."-Lord Playfair, F.R.S., K.C.B., Past-President of the British Association.

"It goes almost without saying that a Handbook of this subject will be in time one of the most generally useful works for the library and the desk."-The Times.

"Some idea of the limitless field which is covered by unselfish workers in the cause of Science may be gathered from the YEAR-BOOK OF THE SCIENTIFIC AND LEARNED SOCIETIES OF GREAT BRITAIN AND IRELAND. The Book is INVALUABLE, for it gives a synopsis of all that has been done during the past year in fourteen departments of research, and the student of any of these subjects can easily lay his finger on the work done in the course of the year."Glasgow Herald.

"An exceedingly well drawn-up volume, compiled with great accuracy, and INDISPENSABLE to anyone who may wish to keep himself abreast of the scientific work of the day."-Edinburgh Medical Journal.

"It is a book which ought to be found in every library of reference."— Guardian.

"Is an INVALUABLE INDEX to the Literature of British Science."-Westminster Review.

“The outcome of a good idea, well carried out.”—Manchester Examiner.

"THE YEAR-BOOK OF SOCIETIES fills a very real want. The volume will become a Scientific Directory, chronicling the work and discoveries of the year, and enabling the worker in one branch to try his hand in all that interests him in kindred lines of research."-Engineering.

"Cannot fail to be of IMMENSE SERVICE to all who are interested in Scientific work."--Glasgow Medical Journal.

"This publication presents in a convenient form the conditions of membership and principal activities of the Learned Societies, together with the chief papers presented at their meetings. At a glance it affords a bird's-eye view of the higher intellectual work of the country, which for certain purposes is indispensable."-Mining Journal.

"It belongs to a class of books which, once you begin to take them in, you can never afterwards dispense with."-Guardian.

LONDON: CHARLES GRIFFIN & CO., LIMITED,

EXETER STREET, STRAND, W.C. 2.

YEAR-BOOK

OF

SCIENTIFIC AND LEARNED SOCIETIES.

SECTION I.

GENERAL SCIENCE.

LONDON.

THE ROYAL SOCIETY,

BURLINGTON HOUSE, PICCADILLY, W. 1.

Officers.-President: Prof. C. S. Sherrington, M.A., M.D. Treasurer: Sir David Prain, C.M.G., C.I.E. Secretaries: W. B. Hardy, M.A.; J. H. Jeans, M. A. Foreign Secretary: Sir Arthur Schuster, Ph.D., Sc. D. Assistant-Secretary and Librarian: F. A. Towle.

Meetings.-Ordinary Meetings are held on Thursdays at 4.30 P.M. from November to June inclusive. The Anniversary Meeting takes place on

St Andrew's Day, November 30. Membership.-Fellows, over 450; Foreign Members, 50; 15 persons elected annually.

Publications during July 1920 to June 1921. Year Book, 1921, 7s. 6d. ; List of Fellows of the Royal Society, 1921, 2s. 6d. ; Philosophical Transactions, 4to, and Proceedings, 8vo, Series A, containing Papers of a Mathematical or Physical Character; Series B, containing Papers of a Biological Character. The Proceedings may be subscribed for in advance, by the public, at a reduced uniform price. The Transactions and Proceedings may be obtained either in separate numbers immediately on publication, or in volumes. About two volumes of each Series appear per annum.

Papers read before the Society. (The letters and Nos. indicate the Section and No. of the "Transactions" or the "Proceedings” in which they are published.)

ROYAL SOCIETY OF LONDON-continued.

Papers in the "Philosophical Transactions," A and B, 1920 and 1921 (sold separately by Harrison & Sons, 45 St Martin's Lane, London, W.C. 1).

Papers in the "Proceedings of the Royal Society," 1920-1921 (sold by Harrison & Sons, 45 St Martin's Lane, W.C. 2).