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absolute alcohol, the metal dissolves, possibly as an acid Measurement of the Horizonial Component of the Earth's Field: () hyposulphite. This solution, left in a vacuum, deposits

Exhibition of a Series of Lecture Experiments illustrating the Proper magnesium hyposulphite.-On acetyl-lactic

acid :

ties of the Gaseous lons produced by Radium and other Source : V.

Dr. W. Watson, F.R.S. Auger. Previous accounts of this substance being con

Rovar. ASTRONOMICAL Society, at 5.-Value of Meteoric Radiasis tradictory, the author has attempted to procure it in a Based on Three Paths: W. F. Denning. -Determination of Longitude sa pure state. It can be obtained either by the action of

the Planet Jupiter : G. W. Hough.-(1) Revised Elements of UY Cygne ;

(2) Revised Elements of Y Lyræ : A. Stanley Williams.-Further Note acetyl chloride on calcium lactate or on lactic acid, or by

on Instrumental Errors affecting Observations of the Moon ; in reply to using acetic anhydride in the place of the acetyl chloride. Mr. Cowell's paper of June, 1904 : H. H. Turner. -Reply to Prof. The substance was obtained in a crystalline form in all Turner's paper: P. H. Cowell. - Note on the Point Distributions on a three preparations, and its physical and chemical proper

Sphere ; with Remarks on the Determination of the Apex of the Sun's

Motion : H. C. Plummer. ties are given.--On the compounds of aluminium chloride MALACOLOGICAL Society, at 8.--Anatomical and Systematic Notes on with hydrocarbons and hydrogen chloride : G. Gustavson. Porcasia, Trigonephris, Corilla, Thersites, and Chloritis : Heary A. By the interaction of benzene, isopropyl chloride, and

Pilsbry. - Some Account of the Anatomy of Cassidaria rugosa, L:

Alexander Reynell. --Notes on a small Collection of Shells from the aluminium chloride, the author has isolated a definite

Victoria Falls, Zambesi River: H. B. Preston -Descriptions of Six compound, the action of which, in the Friedel and Crafts New Species of Land Shells from South Africa: H. Burnup. reaction, may be compared to that of a ferment. This INSTITUTION OF MECHANICAL ENGINEERS, at 8.-President's Address.

Conclusion of discussion on Steam-engine Research Report and Prof. substance can unite both with hydrocarbons and hydrogen

Capper's reply. chloride.-On the hydrides of phenanthrene : Pierre

SATURDAY, APRIL 15. Breteau. Previous work on the hydrogen addition com- Royal INSTITUTION, at 3.--Sone Controverted Questions of Optics : pounds of phenanthrene has bee carried out with the aid Lord Rayleigh.

MONDAY, APRIL 17. of hydriodic acid. The author has applied the Sabatier and Senderens reaction with reduced nickel, and in the

INSTITUTE OF ACTUARIES, at 5.-On the Importance and Practicability

of a Standard Classification of Inpaired Lives: Dr. S. W. Carrutherspresent communication gives the results obtained with the

Social Conditions as affecting Widows' and Orphans' Pension Funds: hexahydride and octahydride of phenanthrene.---On the re- S. J. H. W. Allin. trogradation of artificial starch : E. Roux.—The influence

TUESDAY, APRIL 18. of the ethylene function in active molecule : J.

ROYAL STATISTICAL Society, at 5.

ZOOLOGICAL SOCIETY, at 8.30. Minguin. With the view of throwing further light on the INSTITUTION OF Civil Engineers, at 8.--Annual General Meeting. effect of the ethylene linkage on the rotation, the author has prepared amyl succinate, maleate, and fumarate, as

WEDNESDAY, APRIL 19. well as the corresponding esters of bornyl alcohol, and has

GEOLOGICAL Society, at 8.-The Blea Wyke Rocks and the Dogger in

NorthEast Yorkshire : R. H. Rastall.-Notes on the Geological Aspect measured the rotatory power.---The constitution of the liga

of Some of the North-Eastern Territories of ahe Congo Independent mentary ridge and the evolution of the ligament in existing State: G. F. J. Preumont; with Petrographical Notes: J. A Home Acephalæ analogous to the Rudistæ : R. Anthony.-Dia- ROYAL MICROSCOPICAL SOCIETY, at 8.-- On the Application of them grams showing the ligament in section are given for Unio

Undulatory Theory to Oprical Problems : A E. Conrady.

ROYAL METEOROLOGICAL Society, at 7.30.-- An Account of the ObservaPictorum and letheria Caillaudi at two ages.—Hetero

tions at Crinan in 1904,

and Description of a new Meteorograph for use typical mitosis in the Ascomycetes : René Maire.- with Kites: W. H. Dines. -Rate of Fall of Rain at Searhwaite

Dr H. R. Mill.
On the possible rôle of slipping in metallogeny: L.
De Launay. An application of the idea of charriage to

CHEMICAL Society, at 5.30.-Complex Nitrites of Bismuth : W. C. Hall a study of the continuity of metallic lodes.-On the existence of schists with graptoliths at Haci-El-Khenig. Central Sahara : G. B. M. Flamand. Specimens of schists bear

CONTENTS.

PAGE ing fossils, collected by Captain Cottenest, prove to be characteristically Silurian, and form the first definite proof

A Doctor's View of the East. By T. H. H.

553 of this system in the Central Sahara.-On the presence of

A Book on Museums. By R. L.

594 the Middle and Cpper Carboniferous in the Sahara : Enile

Elementary Physiology. "By Prof. B. Moore

556

Terrestrial Magnetism Haug.-On an extraordinary halo observed at Paris :

557 Louis Besson. This halo, which was observed at the

Our Book Shelf :Montsouris Observatory on March 26, besides the ordinary

Hiscox: "Mechanical Appliances, Mechanical Movecircle and parhelia of 22° presented two abnormal coloured

ments and Novelties of Construction "

557 arcs, the angular measurements of which are given.

Righi : “Modern Theory of Physical Phenomena,

Radio-activity, Ions, Electrons" The Journal of the Royal Agricultural Society" 55$

Steele : “Mediæval Lore from Bartholomew DIARY OF SOCIETIES.

Anglicus”

559 THURSDAY, APRIL 13.

Hertwig: "Ergebnisse und Probleme der ZeugungsROYAL SOCIETY, at 4:30.-On a New Type of Electric Furnace; with a

und Vererbungs-lehre”

559 Redetermination of the Melting Point of Platinum : Dr. J. A. Harker.

Letters to the Editor :-
On Colour Vision by Very Weak Light: Dr. G. J. Burch, F.R.S.- The Dynamical Theory of Gases.-Lord Rayleigh,
(1) The Improved Electric Micrometer; (2) The Amplitude of the
Minimum Audible Impulsive Sound: Dr. P. E. Shaw.-

The Refractive
O.M., F.R.S.,

559 Indices of Sulphuric Acid : Dr. V. H. Veley, F.R.S., and J. J. Manley.

The Physical Cause of the Earth's Rigidity.-Prof. -On the Intensity and Direction of the Force of Gravity in India : T. J. J.See Lieut.-Colonel S. G. Burrard, F.R.S. --A Quantitative Study of Carbon The Lyrid Meteors.-John R. Henry Dioxide Assimilation and Leaf-Temperature in Natural Ilumination : F. F. Blackman and Miss G. Matthaei.

Antarctica. (Illustrated.) By L. C. B. ROYAL INSTITUTION, at 5.-Synthetic Chemistry : Prof. R. Meldola, A New British Marine Expedition F.R.S.

The Indian Earthquake of April 4 . INSTITUTION OF ELECTRICAL ENGINEERS, at 8.-Thé Alternating Cur

Prof. Pietro Tacchini .
rent Series Motor: F. Creedy: --Discussion of Mr. Bion J. Arnold's
address to the joint meeting at St. Louis.

Notes
INSTITUTION OF MINING AND METALLURGY, at 8.--The Kedabeg Copper Our Astronomical Column

Mines: Gustav Köller.-Refining Gold Bullion and Cyanide Precipitates
with Oxygen Gas : T. Kirke Rose. --Wood Gas for Power Purposes and

Comet 1905 a (Giacobini)
Gas Generator : G. M. Douglas.--Notes on the Prestea District, Gold Variability of a Minor Planet .
Coast Colony: P. Poore.- Notes on the New Dharwar Gold Field of Visual Observation of Jupiter's Sixth Satellite .
India : R. O. Ahlers.- The Cause of Border Segregation in some Real Path of a Bright Meteor .
Igneous Magmas: J. Park.

కారం MATHEMATICAL Society, at 5.30.-On Irreducible Jacobians of Degree

A New 24-inch Reflector at Harvard Six : P. W. Wood. --On Fermat's Numbers and the Converse of Fer

Stars with Variable Radial Velocities mat's Theorem: A E. Western.--On the Strains that accompany Bend. | North African Petroglyphs. (Illustrated.) By ing: Prof. A. E. H. Love.-Ordinary Inger Limiting Sets in the Plane A. C. H. or Higher Space : Dr. W. H. Young.

The Mineral Resources of Canada
FRIDAY, APRIL 14.

The Royal Horticultural Society
ROYAL INSTITUTION, at 9. — The Law of Pressure of Gases below Atmo University and Educational Intelligence

sphere : Lord Rayleigh.
Physical Society, at 8.-On Ellipsoidal Lenses : R. J. Sowter.-(1) The

Societies and Academies Determination of the Moment of Inertia of the Magnets used in the Diary of Societies

558

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