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DIARY OF SOCIETIES.

LONDON.

THURSDAY, MARCH 16.

ROYAL SOCIETY, at 4.30.-The Croonian Lecture, on the Position of
Pathology among the Biological Sciences: Prof. Rudolf Virchow,
For. Mem. R.S. (in the Theatre of the London University).
LINNEAN SOCIETY, at 8.-Botanical Results of the Sierra Leone Boundary
Commission: G. F. Scott Elliot.-Contributions to the Arthropod Fauna
of the West Indies: R. I. Pocock.

CHEMICAL SOCIETY, at 8.-Limits of Accuracy of Gold-bullion Assay and
the Losses of Gold Incidental to it: T. K. Rose.-Boiling-Point of Liquid
Nitrous Oxide at Atmospheric Pressure and on the Melting-Point of Solid
Nitrous Oxide: W. Ramsay, F.R.S., and Dr. John Shields.-Isomerism
of Aliphatic Aldoximes: W. R. Dunstan and T. Dymond.-Formic Aldox-
ime: W. R. Dunstan.-Properties of a Benzaldoxime: W. R. Dunstan
and M. C. Luxmore.

ROYAL INSTITUTION, at 3.-The Great Revival-A Study in Mediæval
History: Rev. Augustus Jessopp.

FRIDAY, MARCH 17.

ROYAL INSTITUTION, at 9.-Ancient Egyptian Pigments: Dr. William
James Russell, F.R.S.

SATURDAY, MARCH 18.

ROYAL INSTITUTION, at 3.-Sound and Vibrations: The Right Hon. Lord
Rayleigh, F.R.S.

SUNDAY, MARCH 19.

SUNDAY LECTURE SOCIETY, at 4.-An Hour with the Microscope, with Illustrations from Insect Forms (with Oxy-hydrogen Lantern Illustrations): Gerard Smith.

MONDAY, MARCH 20.

ARISTOTELIAN SOCIETY, at 8.-The Philosophy of Jacob Behmen: C. C.
Massey.
VICTORIA INSTITUTE, at 8.-Buddha and the Light of Asia: R. Collins.

TUESDAY, MARCH 21.

ANTHROPOLOGICAL INSTITUTE, at 8.30.-On the Tasmanians as Repre-
sentatives of Paleolithic Man, with Exhibition of Tasmanian Stone
Implements: Dr. Edward B. Tylor, F. R.S.-Burial Customs in Modern
Greece: Prof. Politis.-The Cave Paintings of Australia: Rev. John
Mathew.

ROYAL STATISTICAL SOCIETY, at 7.45 (at 28 Jermyn Street, S.W.).-
Progress of the External Trade of the United Kingdom in Recent Years:
Stephen Bourne.

INSTITUTION OF CIVIL ENGINEERS, at 8.-Monthly Reception by the
President and Council.-The Breakdown of the Umbria: Thomas
Sopwith.

ROVAL INSTITUTION, at 3.-Physical and. Psychical Neurology: Prof.
Victor Horsley, F.R.S.

WEDNESDAY, MARCH 22.
GEOLOGICAL SOCIETY, at 8.-On the Jaw of a New Carnivorous Dinosaur
from the Oxford Clay of Peterborough: R. Lydekker. On a Mam-
malian Incisor from the Wealden of Hastings: R. Lydekker.-On an In-
trusion of Muscovite-Biotite Gneiss in the South-Eastern Highlands of
Scotland, and its accompanying Thermometamorphism: George Barrow
(communicated by permission of the Director-General of the Geological
Survey).

ROYAL SOCIETY, at 4.30.

THURSDAY, MARCH 23.

ROVAL INSTITUTION, at 3-The Great Revival-A Study in Mediaæval
History: Rev. Augustus Jessopp.

FRIDAY, MARCH 24.

PHYSICAL SOCIETV, at 5.-On the Differential Equation of Electric Flow:
T. H. Blakesley.-Experiments on the Viscosity of Liquids: Prof. Perry,
J. Graham, and L. W. Heath.

INSTITUTION OF CIVIL ENGINEERS, at 7.30.-Some Points in the Regu-
lation of Direct-Current Motors: Francis G. Baily.

ROVAL INSTITUTION, at 9.-Interference Bands and their Applications :
Right Hon. Lord Rayleigh, F.R.S.

SATURDAY, MARCH 25.

ROVAL BOTANIC SOCIETY, at 3.45.

ROVAL INSTITUTION, at 3.-Sound and Vibrations: The Right Hon. Lord
Rayleigh, F.R.S.

STANLEY

Mathematical Instrument Manufacturer to H.M. Government, Council of
India, Science and Art Department, Admiralty, &c.

Mathematical, Drawing, and Surveying Instruments
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W. F. S. obtained the only Medal in the Great Exhibition of 1862 for
Excellence of Construction of Mathematical Instruments, and the only
GOLD MEDAL in the International Inventions Exhibition 1885 for Mathe-
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LARGE CATALOGUE, Fifth Edition, Royal 8vo, 144 PP. 700 Illustrations, Post free, 7d.

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Western Electrical Works, Bristol. London Address: 12 FENCHURCH STREET, E.C. (W. B. ALLISON, AGENT.) ESTABLISHED 1876.

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TO SCIENCE LECTURERS.

See Mr. HUGHES'S PATENT COMBINATION OPTICAL LANTERN, used by late W. LANT CARPENTER, Esq., Prof. FORBES. New Triple constructed for B. J. MALDEN, Esq., this season. New Oxyhydrogen Microscope. Grand Results. Docwra Triple, Prize Medal, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN GUINNESS, Madame ADELINA PATTI, &c. Patent Pamphagos Lantern Science Lecture Sets. Novelties Cheapest and Best. Elaborately Illustrated Catalogue 300 pages, 1s.; Postage, 5d. Smaller do., 6d. Pamphlets Free.-HUGHES, SPECIALIST, Brewster House, Mortimer Road, Kingsland, N.

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SCHOOL APPARATUS FOR TECHNICAL INSTRUCTION.
APPARATUS FOR TEACHING
THEORETICAL MECHANICS.

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Catalogue of 340 Illustrations by post, 6d.

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There are frequent Lithographed Plates by the best Entomologica
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W. LUCAS DISTANT, F.E.S. &c.
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London: WEST, NEWMAN. & CO., 54 Hatton Garden.

WORTHIES.

The following is a list of the Steel Portraits that have appeared in the above Series:

MICHAEL FARADAY.

THOMAS HENRY HUXLEY.

CHARLES DARWIN.

JOHN TYNDALL.

GEORGE GABRIEL STOKES

SIR CHARLES LYELL.

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ADOLF ERIK NORDENSKJÖLD.
LORD KELVIN.

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SIR JOSEPH DALTON HOOKER.
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JEAN BAPTISTE ANDRÉ DUMAS.

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JAMES CLERK MAXWELL.
JAMES PRESCOTT JOULE.
WILLIAM SPOTTISWOODE.

ARTHUR CAYLEY.

SIR C. W. SIEMENS.

JOHN COUCH ADAMS.

JAMES JOSEPH SYLVESTER.

DMITRI IVANOWITSH MENDELEEFF.
LOUIS PASTEUR.

Proof impressions of these, printed on India paper, may be had from the Publishers, price 5s. each; or the Set 5
27 Portraits in a Handsome Portfolio for £7, carriage paid. The Portfolio may be had separately, price 60
Cheques and Money Orders payable to MACMILLAN & CO.,
Proof Impressions of the Portrait of Sir ARCHIBALD GEIKIE, LL.D., F.R.S., issued with NATURE
January 5 may be obtained from the Publishers at 5s. each. N.B.-This Portrait is the first of a New Series.

OFFICE OF "NATURE," 29 BEDFORD STREET, STRAND.

MESSRS. MACMILLAN & CO.'S

NEW AND RECENT SCIENTIFIC BOOKS.

PROF. BARKER.-PHYSICS: ADVANCED COURSE. By GEO. F. BARKER, Professor of Physics in the University of Pennsylvania. 8vo, 215.

NATION:-"The arrangement of subjects treated and the names given them make the work specially noteworthy as an exponent of modern views in physics. While these views are not in themselves new, they here form what we believe is essentially a new classification of the subject for purposes of study and instruction, based on the most recent views of energy considered as being ultimately a phenomenon of the aether.... The work deserves hearty praise for its fulness, its thoroughly modern spirit, its clearness, and a certain freshness in the treatment which adds to its real value as well as to its attractiveness."

THE SECOND VOLUME OF PROF. GRAY'S WELL-KNOWN WORK.

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“I have given, in this second volume," Prof. Gray explains in his Preface, "accounts of experimental investigations in which I have tried to place before the reader, not merely a skeleton of the method followed and the result arrived at, but such a statement in each case as may serve to show the procedure adopted, the difficulties met with, the mode in which they were overcome, the corrections made, and the reduction of the observations to the final result. Thus I have described the researches of Lord Rayleigh, Rowland, J. J. Thomson, and others, on the absolute measurement of currents, the determination of the ohm and of v, the practical methods of testing and measurement devised by Hopkinson, Ayrton, Perry, and other engineers, the magnetic researches of Hopkinson and Ewing, and the discoveries of Hertz in electrical radiation. In all cases it has been my aim, avoiding really unimportant detail, to describe the events of the investigation, and especially the manner in which practical difficulties were met as they arose; for in this way only is it possible I think to learn fully the true lessons of physical experimental science. This plan of proceeding has however rendered the matter, though compressed as far as possible, almost too extensive for a single volume.'

FOR ADVANCED STUDENTS IN ELECTRICITY.

MR. O. HEAVISIDE-ELECTRICAL PAPERS. By OLIVER HEAVISIDE.

2 vols., 8vo., 30s. net.

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PROF. HOSKINS.-THE ELEMENTS OF GRAPHIC STATICS. A TextBook for Students of Engineering. By L. M. HOSKINS, Professor of Pure and Applied Mathematics in the Leland Stanford Junior University, formerly Professor of Mechanics in the University of Wisconsin. 8vo, Ios. net.

GLASGOW HERALD:-"The definitions are well put, and the whole discussion of the subject is quite satisfactory. . It will be found of great value, both in facilitating the work of the student, and, on account of its consistent notation, in guarding the draughtsman against mistakes."

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MR. D. E. JONES. EXAMPLES IN PHYSICS.

By D. E. JONES, B.Sc.,

late Professor of Physics in the University College of Wales, Aberystwith. Second Edition, Revised and Enlarged. 18mo. 3s. 6d.

"The present edition," says the author in the Preface," has been carefully revised, and some sixty pages of additional matter have been added. The examination questions at the ends of the chapters have been replaced by new sets of problems from recent papers.”

NEW BOOK BY PROF. OLIVER LODGE.

PROF. LODGE.—PIONEERS OF SCIENCE. BY OLIVER LODGE, F.R.S.,
Professor of Physics in the Victoria University College, Liverpool. With Portraits and other Illustrations.
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Extra A course of lectures on the lives of epoch making men, principally in the Department of Astronomy, giving an account of their work, and tracing their influence on the development of human thought. The first part of the course, called "From Dark to Daylight," consists of nine lectures on the men from Copernicus to Newton, especially Tycho, Kepler, Galileo, Descartes, and aims at explaining the scientific aspect of their work in a clear and intelligible manner with copious illustrations. The second part of the course consists of nine lectures on such subjects as the Velocity of Light, Herschel and the Stars, the discoveries of Asteroids and of Neptune, Comets, and Meteors, and the Tides, with some biographical details, and much scientific exposition addressed to persons of literary education.

NATIONAL OBSERVER.—"The present work is in marked contrast with most popular science; it is accurate, yet it is gracefully written."

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