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DIARY OF SOCIETIES. 
THURSDAY, Mav +6. 
Roya Society, at 4.30.—(1) The General Theory of Colloidal Solutions 3 
(2) The Tension of Composite Fluid Surfaces and the Mechanical Stability 
of Films of Fluid; (3) On the Formation of a Heat-reversible Gel : 
W. B. Hardy.—(1) Studies on Enzyme Action. XVI. The Enzymes of 
Emulsin. II. Prunase, the correlate of Prunasin ; (2) Studies on Enzyme 
Action. XVII. Enzymes of the Emulsin Tvpe. II. The Distribution of | 
8-enzymes in Plants: Prof. H. E. Armstrong, E. F. Armstrong, and 
E. Horton.—Studes on Enzyme Action. XVIII. Enzymes of the 
Emulsin Type. IIf. Linase and other Enzymes in Linacez: Prof. H. B. 
Armstrong and J. V. Eyre.—Reflex Rhythm Induced by Concurrent 
Excitation and Inhibition: Dr. Alexander Forbes.—The Factors in 
Rhythmic Activity of the Nervous System: T. Graham Brown. 
NO, 2220, VOL. 89] 
[May 16, 1912 
Roya InstiruTion, at 3.—Ice Formation in Canada. I. The Physical 
Aspect: Prof. H. T. Barnes, F.R.S. 
InsTiTUTION OF MINING AND METALLURGY, at 8.—Illogical Precision i in 
Mine Reports: F. Percy Rolfe.—The Law of the Pay-streak in Placer 
Deposits: J. B. Tyrrell.—Gold and Platinum Alluvial Deposits in 
Russia: Leon Perret.—A Plant for the Enrichment of Pyritic Blende 
Concentrates: E. C. Hugon. 
Institution OF Evecrricat ENGINEERS, at 7.45.—Annual General Meet- 
ing.—At 8.30.—Condensers in Series with Metal Filament Lamps: A. W. 
Ashton. 
Royat Sociery or Arts, at 4.30.—Indian Railways: Neville Priestley. 
FRIDAY, May 17. 
Roya InstiruTion, at 9.—High Frequency Currents : W. Duddell, F.R.S. 
MONDAY, May 20. 
Roya GEOGRAPHICAL SOCIETY, at 3.—Anniversary Meeting. 
Royat Society or Arts, at 8. —Heavy Oil Engines: Captain H. R- 
Sankey, R.E. 
TUESDAY, May 21. 
ZooLocicaL Society, at 8.20.—Lantern Exhibition of Game Animals from 
British East Africa: A. Blayney Percival.—The Local Races of Burchell’s 
Zebra: Major J. Stevenson Hamilton.—On Two New Larval Trematodes 
from the Striped Snake : Dr. W. Nicoll —On Differ ofeltis, a New Genus 
of the Crustacean Order Branchiura: Dr. W. T. Calman.—Second Con- 
tribution to our Knowledge of the Varieties of the Wall-Lizard (Lacerta 
muralis). G. A. Boulenger —A Note on the Rare British Nudibranch 
Hancockia eudactylota, Gosse : Sir Charles Eliot, K.C.M.G. 
BO Ne TURION, at 3.—The Study of Genetics : Prof. W. Bateson, 
F.R 
RovaL ANTHROPOLOGICAL INSTITUTE, at 8.15.—Demonstration of Maor 
Skulls: Dr, R. J. Gladstone. 
RoyaL Society oF ARTs, at 4.30.—Australian Railways: Hon. J. G. 
Jenkins. 
Roya SraTisTICAL Society, at 5.—Railway Accounts and Statistics = 
W. M. Ackworth and George Paish. 
WEDNESDAY, May 22. 
Rovat METEOROLOGICAL Society, at 4.30. — The Thunderstorm of 
March 11, 1912, in Hampshire and Sussex: C. J. P. Cave —Ihe Auto- 
matic Release of Self-Recording Instruments from Ballons-Sondes: Eric S. 
Bruce. 
THURSDAY, May 23. 
Roya Society, at 4.30.—Probable Papers: Theory of a New Mechanism 
for Varying the Volume of Discharge in the Rotating Slider Crank Form 
in the Chamber Crank Chain of Rouleaux: H. S. Hele-Shaw.—A New 
Treatment of Optical Aberrations: Prof. R. A. Sampson.—On the Ex- 
tinction of Light by an Illaminared Retina: Sir W. de W. Abney, K.C.B. 
—Optical Measurements at High Pressi res ; Walter Wahl-—The Changes 
in Certain Absorption Spectra in Different Solvents: T. R. Merton.— 
Changes in Absorption Spectra of ‘ Didymium” Salts: W. C: Ball.— 
The Viscosity of Cacbon Dioxide: Dr. P. Phillips. 
Royat InstiTu1ION, at 3 —Ice Formation in Canada: The Economic 
Aspect: Prof. H. T. Barnes, F.R.S. 
FRIDAY, May 24. : 
Royat INsTITUTION, at 9.—Recent Advances in Agricultural Science: The 
Fertility of the Soil: A. D. Hall, F.R.S. 
CONTENTS. 
PAGE 
Recent Works in Eugenics. By E.H.J.S.... . 263 
Studiesin Biology . + Boe, Saree 
Plant Physiology for Agricultural Students . pee bieix 
Non-Euclidean Geometry. ByG.B.M. .... . 266 
Our Bookshelf Net Sia oS ho 255 y7/ 
Letters to the Editor :-— 
Clouds and Shadows. (J7/ustrated.)—Charles J. P. 
Cavers . .. aa do. dy CR 
Mammalian Remains ‘at the Base of the Chalky 
Boulder Clay Formation in Suffolk. (///estvated.) 
—J. Reid Moir .. 268 
Les Eclipses d’Hiver et les Helipses dhe. —W. de 
Fonvielle . «| Stet VaezOR: 
The Ammonia Flame.—Alfred C. Egerton ee 7/03 
Report of the Tuberculosis Committee . ... . . 270 
Sardines:in Science and Commerce = / ...:. 3:29) 278 
The Royal Society Conversazione. ....... . 271 
Notesine. bo idem: 255 
Our Astronomical ‘Column : — 
Reported Discovery of a New Comet. . . - ... - 277 
Wnewkotation of Uranus) gaerectae bok) cele mea 
The Recent Solar Eclipse . . rea 447 
The Origins of the Bright Lines in Nove Spectra os Pea 
The Iron and Steel Institute cr 278 
M. Poincare’s Lectures at the University ‘of London 279 
Food andthe Child. . Le ona eae 
The Reform Movement at ‘Cambridge . am . . 280 
Electricity Supply: Past, Present, and Future. By 
Alan A. Campbell Swinton : _ Se ee 
University and Educational Intelligence. 05 | at 
Societies and Academies’. . | Signy =~ =) eee 
BooksiReccived =... .. 2. aaah Re oo emremena 
Diary of Societies. . . ees es os 
