communication (Comptes rendus, cix. p. 900) on the combina.

THURSDAY, FEURUARY 6. tions of potassium and sodium with ammonia.--On the ROYAL SOCIETY, at 4-30. absorption of the ultra-violet rays by some organic substances LINNEAN SOCIETY, at 8.-On the Stamens and Setze of Scirpea:( ! belonging to the fatty series, by MM. J. L. Soret and Alb. A.

Clarke, F.R.S.-On the Flora of Patagonia: John Ball, F.R.S.

CHEMICAL SOCIETY, at 8 --Ballot for the Election of Fellows. Thes Rilliet. These studies, which to a large extent confirm the of Nitrogen : Prof. Ramsay, F R.S. -Studies on the Constitution alle conclusions of Messrs. Hartley and Huntington (Philosophical Derivatives of Naphthalene: Dr. Armstrong and W.P. Wynne Transactions of the Royal Society, 1879), show in a general way

Action of Chromium Oxychloride on Nitrobenzole: G. G. Hendes

J. Morrow Campbell. that the measurement of the absorption of the ultra-violet rays ROYAL INSTITUTION, at 3.-Sculpture in Relation to the Age: E4r constitutes a delicate means of estimating the purity of organic Roscoe Mullins. substances.-On the refracting powers of double salts in solu

FRIDAY, FEURUARY 7. tion, by M. E. Doumer. These researches have been carried PHYSICAL SOCIETY, at 5:-Annual General Meeting -On Galvancers on by the same method which enabled the author to determine

Prof. W. E. Ayrton, F.R.S., T. Mather, and W. E. Sumpner the refracting powers of simple salts. The results, which are GEOLOGISTS ASSOCIATION, at 7-30.-Annual General Meeting – Nste

Carbon Deposit in a Blake Telephone Transmitter: F. B Have here tabulated, show that the molecular refracting power of a the Nature of the Geological Record : The President double salt is equal to the sum of the molecular refracting powers SOCIETY OF Arts, at 5.- The Utility of Forests and the Study of Fores. of the constituent simple salts; and in general, the molecular INSTITUTION OF CIVIL ENGINEERS, at 7.30.-Reclamation of Land on the refracting power of any salt, simple or double, is proportional to River Tees : Colin P. Fowler. the number of valences of the metallic part of the salt.-Papers ROYAL INSTITUTION, at 9.-The London Stage in Elabeth's Reso were read by M. Ph. A. Guye, on the molecular constitution of

Henry B. Wheatley, bodies at the critical point; by M. Raoul Varet, on the reactions between the salts of copper and the metallic cyanides; Royal Botanic SOCIETY, at 3-45

SATURDAY, FERRUARY 8. by MM. C. Chabrié and L. Lapicque, on the physiological ROYAL INSTITUTION, at 3:- The Natural History of the Hanse, action of selenious acid ; and by M. L. de Launay, on the its Extinct and Existing Allies : Prof. Flower, C.B., F.R.S. 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

CONTENTS.

PAGE in a region previously forming a vast marshy plain with shallow lakes.

The Hyderabad Chloroform Commission
Hygiene
In the High Alps. By T. G. B.

The Story of Chemistry.
DIARY OF SOCIETIES.

Luminous Organisms. By Prof. W. A. Herdman *
LONDON.

Our Book Shelf:-
THURSDAY, JANUARY 30.

Meldola : “ The Chemistry of Photography"
ROYAL SOCIETY, at 4-30.-Investigations into the Effects of Training Walls

Smith: “ The Popular Works of Johann Gottliels in an Estuary like the Mersey: L. F. Vernon Harcourt:-On Outlying

Fichte”
Nerve-Cells in the Mammalian Spinal Cord : C S. Sherrington.-On the Young: “Travels in France
Germination of the Seed of the Castor-oil Plant (Ricinus communis): Prof.

Letters to the Editor :-
J. R. Green.
ROYAL INSTITUTION, at 3.-Sculpture in Relation to the Age : Edwin Acquired Characters and Congenital Variation. The
Roscoe Mullins.

Duke of Argyll, F.R.S.
FRIDAY, JANUARY 31.

Multiple Resonance obtained in Hertz's Vibrators ROYAL INSTITUTION, at 9.-Smokeless Explosives : Sir Frederick Abel,

Prof. Geo. Fras. Fitzgerald; Fred. T. C.B., F.R.S. SATURDAY, FEBRUARY 1,

Trouton.

Bourdon's Pressure-Gauge. (Ilustrated.) -- Proi. A. Essex FIELD CLUB, at 7.-Annual General Meeting.-Migration of Birds :

M. Worthington E. A. Fitch, President. ROYAL INSTITUTION, at 3: ---The Natural History of the Horse, and of Foreign Substances attached to Crabs. - Alfred O. its Extinct and Existing Allies : Prof. Flower, C. B., F.R.S.

Walker; Captain David Wilson-Barker.

Thought and Breathing.-R. Barrett Pope
SUNDAY, FEBRUARY 2.

On the Effect of Oil on Disturbed Water.-A. B.
SUNDAY LECTURE SOCIETY, at 4 - The Health of the Mind; and Mental
Contagions : Dr. B. W. Richardson, F.R.S.

Luminous' Clouds. -T. w. Backhouse; Joseph MONDAY, FEBRUARY 3.

John Murphy.

The Meteorite of Mighei.-J. Rutherford Hill
SOCIETY OF Arts, at 8.--The Electromagnet: Dr. Silvanus P. Thompson,
Society OF CHEMICAL INDUSTRY, at 8. --On the Properties and Applica-

Achlya.-Prof. Marcus M, Hartog tions of Metallic Compounds of the Phenols : A. H. Allen and W. W.

The Parallelogram of Forces.-Prof. A. G. GreenStaveley.

hill, F.R.S.. ARISTOTELIAN SOCIETY, at 8.-The Conception of Sovereignty: D. G. Foot-Pounds.-A. S. E.

Ritchie.
ROYAL INSTITUTION, at 5.-General Monthly Meeting,

Chiff-Chaff singing in September.-F. M. Burton

East Africa and its Big Game. (Illustrated.). ... TUESDAY, FEBRUARY 4

The Coral Reefs of the Java Sea and its Vicinity. ZOOLOGICAL SOCIETY, at 4.-On the Morphology of a Reptilian Bird By Dr. H. B. Guppy.

WATKIN ANEROID BAROMETER.

AA MENY

NOW MADE IN FLAT WATCHI SIZE.

Amongst several unsolicited Testimonials the two

October 10, 1888.

ROBT. J. ELLERY,

THE OBSERVATORY, MELBOURNE, DEAR Sur, -The Walkin Aneroid anly reached me following have been received by the maker three weeks ago. I am very much pleased with it, and

EDINBURGH, May 31, 1889,
have given it a pretty severe trial with very satisfactory

DEAR SIR, I have just returned from a six weeks'
stay at the Ben Nevis Observatory, and while there
had an opportunity of testing the admirable qualities of
your new "Watkin" Aneroid. The result has been
most satisfactory, the extreme error noted being only
about the one-hundredth of an inch. During my stay
at the Observatory the Aneroid was frequently tested
by taking it down a couple of thousand feet and then
comparing it with the standard on my return. The
results obtained speak volumes for the high-class work
manship and great accuracy you have attained in the

Observer, Scott. Met. Soc.
R. C. MOSSMAN, F.R.M.S.,

(Signed)
manufacture of this instrument.

MAKER: J. J. HICKS, 8, 9, & 10 Hatton Garden, London.

To be obtained of all Opticians.

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