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communication (Comptes rendus, cix. p. 900) on the combina. tions of potassium and sodium with ammonia.-On the absorption of the ultra-violet rays by some organic substances belonging to the fatty series, by MM. J. L. Soret and Alb. A. Rilliet. These studies, which to a large extent confirm the conclusions of Messrs. Hartley and Huntington (Philosophical Transactions of the Royal Society, 1879), show in a general way that the measurement of the absorption of the ultra-violet rays constitutes a delicate means of estimating the purity of organic substances. On the refracting powers of double salts in solution, by M. E. Doumer. These researches have been carried on by the same method which enabled the author to determine the refracting powers of simple salts. The results, which are here tabulated, show that the molecular refracting power of a double salt is equal to the sum of the molecular refracting powers of the constituent simple salts; and in general, the molecular refracting power of any salt, simple or double, is proportional to the number of valences of the metallic part of the salt.-Papers were read by M. Ph. A. Guye, on the molecular constitution of bodies at the critical point; by M. Raoul Varet, on the reactions between the salts of copper and the metallic cyanides; by MM. C. Chabrié and L. Lapicque, on the physiological action of selenious acid; and by M. L. de Launay, on the geology of the island of Lesbos. M. de Launay considers the volcanic eruptions of this island as comparatively recent, possibly not older than the Pliocene epoch, and doubtless contemporary with the disturbances resulting in the creation of the Ægean Sea in a region previously forming a vast marshy plain with shallow lakes.

DIARY OF SOCIETIES.

LONDON.

THURSDAY, JANUARY 30.

ROYAL SOCIETY, at 4.30.-Investigations into the Effects of Training Walls in an Estuary like the Mersey: L. F. Vernon Harcourt.-On Outlying Nerve Cells in the Mammalian Spinal Cord: C S. Sherrington. On the Germination of the Seed of the Castor-oil Plant (Ricinus communis): Prof. J. R. Green.

ROYAL INSTITUTION, at 3-Sculpture in Relation to the Age: Edwin Roscoe Mullins.

FRIDAY, JANUARY 31.

ROYAL INSTITUTION, at 9.-Smokeless Explosives: Sir Frederick Abel, C.B., F.R.S.

SATURDAY, FEBRUARY 1.

Essex Field CLUB, at 7.-Annual General Meeting.-Migration of Birds: E. A. Fitch, President.

ROYAL INSTITUTION, at 3.-The Natural History of the Horse, and of its Extinct and Existing Allies: Prof. Flower, C.B., F. R.S.

SUNDAY, FEBRUARY 2.

SUNDAY LECture Society, at 4.-The Health of the Mind; and Mental Contagions: Dr. B. W. Richardson, F.R. S.

MONDAY, FEBRUARY 3.

SOCIETY OF ARTS, at 8.-The Electromagnet: Dr. Silvanus P. Thompson. SOCIETY OF CHEMICAL INDUSTRY, at 8.-On the Properties and Applications of Metallic Compounds of the Phenols: A. H. Allen and W. W. Staveley.

ARISTOTELIAN SOCIETY, at 8.-The Conception of Sovereignty: D. G. Ritchie.

ROYAL INSTITUTION, at 5.-General Monthly Meeting.

TUESDAY, FEBRUARY 4.

ZOOLOGICAL SOCIETY, at 4.-On the Morphology of a Reptilian Bird (Opisthocomus cristatus): W. K. Parker, F.R.S.-Observations on Wolves, Jackals, Dogs, and Foxes: A. D. Bartlett.-A Synopsis of the Genera of the Family Soricida: G. E. Dobson, F. R.S.

INSTITUTION OF CIVIL ENGINEERS, at 8.-Bars at the Mouths of Tidal Estuaries: W. H. Wheeler.

ROYAL INSTITUTION, at 3.-The Post-Darwinian Period: Prof. G. J. Romanes, F.R.S.

WEDNESDAY, FEBRUARY 5.

GEOLOGICAL SOCIETY, at 8.-The Variolitic Rocks of Mount Genèvre :
G. A. J. Cole and J. W. Gregory. -The Propylites of the Western Isles
of Scotland and their Relation to the Andesites and Diorites of the same
District: Prof. J. W. Judd, F.R.S.

ENTOMOLOGICAL SOCIETY, at 7.-On the Peculiarities of the Terminal Seg-
ment in some Male Hemiptera: Dr. Sharp. The Lepidoptera of Burmah:
Colonel Chas. Swinhoe. On the Phylogenetic Significance of the Wing-
Markings in certain Genera of Nymphalidæ : Dr. F. A. Dixey.
SOCIETY OF ARTS, at 8.-High-Speed Knitting and Weaving without Weft:
Arthur Paget.

UNIVERSITY COLLEGE CHEMICAL AND PHYSICAL SOCIETY, at 4.30.-
The Life and Work of Faraday: S. B. Schryver,

THURSDAY, FEBRUARY 6

ROYAL SOCIETY, at 4.30.
LINNEAN SOCIETY, at 8.-On the Stamens and Setz of Scirpex:(.
Clarke, F.R.S.-On the Flora of Patagonia: John Ball. F.RS.
CHEMICAL SOCIETY, at 8-Ballot for the Election of Fellows - The Or
of Nitrogen: Prof. Ramsay, FR.S.-Studies on the Constitution of
Derivatives of Naphthalene: Dr. Armstrong and W. P. Wynne-
Action of Chromium Oxychloride on Nitrobenzole: G. G. Henderson a
J. Morrow Campbell.

ROYAL INSTITUTION, at 3.-Sculpture in Relation to the Age: Er
Roscoe Mullins.

FRIDAY, FEBRUARY 7.

PHYSICAL SOCIETY, at 5.-Annual General Meeting.-On Galvanc Prof. W. E. Ayrton, F.R.S., T. Mather, and W. E. SumpnerCarbon Deposit in a Blake Telephone Transmitter: F. B. Hawes GEOLOGISTS' ASSOCIATION, at 7.30.-Annual General Meeting - Note the Nature of the Geological Record: The President.

SOCIETY OF ARTS, at 5.-The Utility of Forests and the Study of Fores Dr. Schlich.

INSTITUTION OF CIVIL ENGINEERS, at 7.30.-Reclamation of Land on t River Tees: Colin P. Fowler.

ROVAL INSTITUTION, at 9.-The London Stage in Elizabeth's Re, Henry B. Wheatley.

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The Hyderabad Chloroform Commission
Hygiene.

In the High Alps. By T. G. B.

The Story of Chemistry.

Luminous Organisms. By Prof. W. A. Herdman
Our Book Shelf:-
:-

Meldola: "The Chemistry of Photography"
Smith: "The Popular Works of Johann Gottlieb
Fichte "

Young: "Travels in France

Letters to the Editor:

Acquired Characters and Congenital Variation.-The
Duke of Argyll, F.R.S.

Multiple Resonance obtained in Hertz's Vibrators -
Prof. Geo. Fras. Fitzgerald; Fred. T.
Trouton

Bourdon's Pressure-Gauge. (Illustrated.) -Prof. A.
M. Worthington

Foreign Substances attached to Crabs.-Alfred 0.
Walker; Captain David Wilson-Barker.
Thought and Breathing.-R. Barrett Pope

On the Effect of Oil on Disturbed Water.-A. B.
Basset, F.R.S.

Luminous Clouds.-T. W. Backhouse; Joseph
John Murphy.

The Meteorite of Mighel.-J. Rutherford Hill
Achlya.-Prof. Marcus M. Hartog

The Parallelogram of Forces.-Prof. A. G. Green-
hill, F.R. S.

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Foot-Pounds.-A. S. E.

Chiff-Chaff singing in September.-F. M. Burton East Africa and its Big Game. (Illustrated.) . . . The Coral Reefs of the Java Sea and its Vicinity. By Dr. H. B. Guppy

The Electric Light at the British Museum
Notes

Our Astronomical Column:

Objects for the Spectroscope.-A. Fowler ..
The Total Eclipse of January 1, 1889

The Orbits of the Companions of Brooks' Comel
(1889 V., July 6)
Greenwich Observatory

The Physical and Chemical Characteristics of
Meteorites as throwing Light upon their Past
History. (Illustrated.) By J. Norman Lockyer,
F.R.S.

Scientific Serials

Societies and Academies

Diary of Societies. .

PAGE

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October 10, 1888.
THE OBSERVATORY, MELBOURNE,
Amongst several unsolicited Testimonials the two
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ROBT. J. ELLERY.
I am very much pleased with it, and
DEAR SIR,-The Watkin Aneroid only reached me
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three weeks ago.
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EDINBURGH, May 31, 1889,
DEAR SIR,-I have just returned from a six weeks'
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Watkin" Aneroid. The result has been
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R. C. MOSSMAN, F.R.M.S.,
manship and great accuracy you have attained in the
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your new

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MESSRS. MACMILLAN AND CO.'S NEW BOOKS.

A New Book by Sir Charles Dilke, Bart.

PROBLEMS OF GREATER BRITAIN.

BY THE RIGHT HON. SIR CHARLES DILKE, BART.

With Maps. 2 Vols., 8vo, 36s.

[Ready January 31. *.* This is in no sense a new edition of the well-known "Greater Britain." That was a record of travel, which, though still in emand, is necessarily in some points antiquated. Not seeing his way to incorporate new facts or correct old statements in such a ay as to produce a satisfactory result, Sir Charles Dilke thought it best to produce an entirely new book upon the same subjects as bose treated in the original work, but dealt with from the point of view of political and social observation and comparison, rather an from that of descriptive sight-seeing. The new book, therefore, is not a book of travel, but a treatise on the present position of Greater Britain, in which special attention has been given to the relation of the English-speaking countries with one another, and comparative politics of the countries under British government.

AMONG THE SELKIRK GLACIERS.

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[Nearly Ready.

GREEN, M. A., F.R.G.S., Author of "The High Alps of New Zealand." Crown 8vo. THE LIBRARY REFERENCE ATLAS OF THE WORLD. A Complete Series of 84 Modern Maps. By JOHN BARTHOLOMEW, F.R. G. S. With Geographical Index to 100,000 places. HalfMorocco, Gilt Edges. Folio, £2 12s. 6d. net.

This work has been designed with the object of supplying the public with a thoroughly complete and accurate atlas of Modern Geography, in a convenient reference form, and at a moderate price.

A NEW BOOK BY MR. ALFRED RUSSEL WALLACE. THIRD EDITION.

DARWINISM; an Exposition of the Theory of Natural Selection, with some of its Applications. By ALFRED RUSSEL WALLACE, LL.D., D. C. L., F. L. S., &c., Author of "The Malay Archipelago," The Geographical Distribution of Animals," "Island Life," &c. With Portrait and Map. Third Edition. Crown 8vo, 9s. THE CHEMISTRY OF PHOTOGRAPHY. By RAPHAEL MELDOLA, F.R.S., Professor of Chemistry in the Technical College, Finsbury, City and Guilds of London Institute for the Advancement of Technical Education. Crown 8vo, 6s. (Nature Series.)

ENGLISH MEN OF ACTION.-New Volume.

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The following Volumes in the Series, Crown 8vo, 2s. 6d. each, are ready :

GENERAL GORDON. By Col. Sir W. BUTLER.
HENRY THE FIFTH. By the Rev. A. J. CHURCH.
LIVINGSTONE. By Mr. THOMAS HUGHES.
LORD LAWRENCE. By Sir RICHARD TEMPLE.
WELLINGTON. By Mr. GEORGE HOOPER.

[Ready January 31.

DAMPIER. By Mr. W. CLARK RUSSELL.
MONK. By Mr. JULIAN CORBETT.
STRAFFORD. By Mr. H. D. TRAILL.
WARREN HASTINGS. By Sir ALFRED LYALL.

By W. Crown 8vo. [Next Week.

Other Volumes are in the Press and in preparation.

ELEMENTARY DYNAMICS OF PARTICLES AND SOLIDS.
M. HICKS, M.A., F. R.S., Principal of Firth College, Sheffield; late Fellow of St. John's College, Cambridge.

SECOND EDITION, REVISED AND GREATLY ENLARGED.

ABSOLUTE MEASUREMENTS IN ELECTRICITY AND MAGNETISM. By ANDREW GRAY, M. A., F.R.S. E., Professor of Physics in the University College of North Wales. Second Edition. Revised and Greatly Enlarged. Fcap. 8vo, 5s. 6d.

SECOND EDITION, REVISED.

APPLIED MECHANICS: an Elementary General Introduction to the Theory of Structures and Machines. By JAMES H. COTTERILL, F. R. S., Associate Member of the Council of the Institution of Naval Architects, Associate Member of the Institute of Civil Engineers, Professor of Applied Mechanics in the Royal Naval College, Greenwich. Second Edition, Revised. Medium 8vo, 18s.

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Printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Published b MACMILLAN AND Co., at the Office, 29 and 30 Bedford Street, Covent Garden.-THURSDAY, January 30, 1890.

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