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DIARY OF SOCIETIES.

London.
THURSDA Y, FinmiAtr j5.

Royal Society, at«. jo.—On the Organisation of the Fossil Plants of the Coal-measures. Part XIX.: Prof. W. C. Williamson, F.R.S—On Biologic Regions and Tabulation Areas: C B. Clarke, F.R.S.—Observations on the Structure, Relations, Progressive Development, and Growth of the Electric Organ of the Skate: Prof. Ewart.

Institution op Ei.scrxiCAL Engineers, at B.—Some Experimental Investigations of Alternate Currents' Alexander Siemens.—On the Specification of Insulated Conductors for Electric Lighting and other Purposes: W. H. Preece, F.R.S. (Discussion.)

RoVAl- Institution, at v—Some Recent Riological Discoveries: Prof. E. Ray Lankester, F.R.S.

Lostdost iNmTOTlON. at 6.—Experimental Meteorology (Illustrated): Shelford Bidwell. F.R.S.

Camira Club, at 6.—Annual Meeting. At 8.—Lantern Exhibition.

FRIDAY, Fmiuahtjo.

Physical Society, at ;.—On Modes of Representing Electromotive Forces and Currents in Diagrams: Prof. S. P. Thompson, F.R.S.—On the Flexure of Long Pillars under their own Weigh:: Prof. Maurice FitrGerald —On Chokintr Coils: Prof. J. Perry, F.R.S.

Institution Op Civil Engines**, at 7.30—The Construction and Efficiency of Locomotive Boilers : G. H. Sheffield.

Roval Institution, at ».—Optical Projection; Sir David Salomons, Bart.

SA TffXDA Y. Febeoaxv ,,.

Roval Botanic Society, at 1.45.

Royal Institution, at 3.—Matter; at Rest and in Motion: Right Hon. Lord Rayleigh, F.R.S.

SUNDAY, Faniti'Aisv 18.

Sunday Lectuse Society, at 4—The Natural History and Mental and Moral Character of the Dog (with Oxy-hydrogen Lantern Illustrations): Frank Kerslake. (This lecture wan written by the late Mr. Arthur Nicols.)

MONDAY, FEBEVAEYaa.

Londjn Institution, at 5.—The Saga of Hamlet: Israel Gollaoci

TUESDAY, Ma«ch I.

Zoological Society, at 8.30.—On Stridulation in certain Lepidoptera, and the Distortion of the Hind Wings in the Males of certain Ommatophorinsc: G. F. Hampson.—On the Retention of Functional Gills in Young Frogs (Rana temporaria), with Rrmarks on the Protrusion of the Fore Limb*: Prof. W. N . Parker.—A Contribution to the Classification of Ophiuroids, with Descriptions of v>mc Ne* and Little-known Forms : Prof. F. Jeffrey Bell.—Observations on an Earthworm possessed of Seven Pairs of Ovaries: M. F. Woodward.

In*tit"tiom Op Civil Rncinese*. at S.—Monthly Ballot for Members.— The Bishop Rock Lighthouses: W. T. Douglass.—The Illumination by Gas of Tory Island Lighthouse, County Donegal: David C. Salmond. (Discussion-)

Royal Institution, at j.—Th* Brain: Prof. Victor Horsley, F.R.S.

THURSDAY, Mabch 3.

Royal Society, at 4.30.—Ths following papers will /rsvsuVr be read:— Dynamo-electric Machinery: Dr. Hopkinvjn, F.R.S.. and t. Wilson.— On the CUrk Cell as a Standard of Electromotive Force: R. T. Guuebrook, F.R.S.,and S. Skinner.—Certain Correlated Variations in Crangon vulgaris: Prof. Weldon, F.RS.—An Experimental Investigation of the Nerve Roots which enter into the Formation of the Brachial Plexus of the Dog: Dr. J. & Risien Russell.

LisfNEAJC Society, at 8.—Variations in the Internal Anatomy of the Ganuv Suue: A. D. Michael.—On Vitality of Spores in Bacillus: Allan Swan.

Chemical SOCIETY, at 8—A Rule for determining whether a given Ben-
ams Mono-derivative shall give a Meta-di-derivalive or a Mixture of
tJrtho. and Para-di-derivative*: Prof. Crum Brown and Dr. Gibson.—
The Relative urienting Effect of Chlorine and Bromine: Dr. H. E.
Atmstr mg and Mr. Briggs—Contributions to our Knowledge of the
Aconite Alkaloids; Part 11., The Alkaloids of True Aconitum Napellus:
Prof. Ihanstan and Mr. Murray. Patt III..'Die Properties of Aconine:
Coaversion of Aconine into Aconitine : Prof. Dunstanand Dr. Passmore.—
Note 00 the Origin of the Luminosity of Coal-Gas Flames: William
Foster.
Royal Institution, at 3.—The Progress of Romance in the Middle Ages:
Prof. W. P. Ker

Liimi*)m IstsmTtrriOM, at 7.—Orchestral Music in the Sixteenth Century
I Illustrated): Dr. A. C. Mackenzie.

FRIDAY, Maecka

2«<*-»Girrs" Association, at 6.

Royal Institution, at ., —The Surface Film of Water and its Reunion to the Ufa of Plants and Animals: Prof. L. C. MialL

SATURDAY, Maecm 5

l»STrrono»i Opciyil Enoinesss, at v—Students' Visit to th* Oil-Works

of the Great Northern Railway at Holloway. Royal Institution, at 3.—Matter; at Rest and in Motion: Right Hon.

Lord Rayleigh, F.R.S.

By A. Smith Woodward,

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NATURAL SCIENCE:

H /©ontblp "Review of Scientific progress.

CONTENTS of So. /., MARCH 189a. Introduction.—Editorial Notes and Comments. I. A Contribution to the Theory of Mimicry. Br FRANK E. BEDDARD, M.A.. F.R.S E. II. Deep-Sea Deposits: a Review of the Work of the •CHALLENGER" EXPEDITION By J. J. H. Teall. M.A.. F.R S.

III. The Evolution of Fins.

F.L.S. Illustrated.

IV. Some Salient Points in the Study of Mammals

DURING 1891. Br R. Lvdekker. B.A., F.Z.S. Illustrated.
V. English Lake Dwellings. By James \V. Davis,
F.S A.
Marine Snakes. By G. A. Boulikgbr, F.Z.S.

Illustrated.
The Exploration of Coral Reefs by Means of

BORINGS. By I. W. Grecoey, B.Sc., F.G.S.
Some Recent Researches on Insects and Arach
NIDS. ByG. H Caufkntsk. B.Sc.
IX. The Relationship of the Carboniferous Plants
SIGILLARIA AND ST1GMAR1A. By "I Iiosia* Hick, B.A.,
BSc
X. The Mammals of India: a Review. By R.
Lvuekkek, B.A.. F Z.S. lllustrated-
Reviews and Notices of some New Books.
News of the Universities, Museums, and Societies.
Obituary.

MACMILLAN & CO., LONDON.

VI. VII. VIII.

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