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DIARY OF SOCIETIES. 
THURSDAY, June 13. 
Roya Society, at 4.30.—An Expansion Apparatus for making Visible the 
Tracks of Ionizing Particles in Gases, and some Results obtained by its 
Use: C. T. R. Wilson.—A Chemically Active Modification of Nitrogen, 
produced by the Electric Discharge, 1V.: Hon. R. J. Strutt.—(r) On 
the Series Lines in the Arc Spectrum of Mercury. (2) On the Constitu- 
tion of the Mercury Green Line A=s461 AU and on the Magnetic 
Resolution of its Satellites by an Echelon Grating: Prof. J. C. 
McLennan.—(1) On the Convergence of certain Series involving the 
Fourier Constants of a Function. (2) On Classes of Summable Functions 
and their Fourier Serjes : Prof. W. H. Young.—The Number of 8 Particles 
emitted in the Transformation of Radium: H. G. Y. Moseley.—Portland 
Experiments on the Flow of Oilin Pipes: S. D. Carothers.—On a Form 
of the Solution of Laplace’s Equation suitable for Problems relating to 
two Spheres: G. B. Jeffery.—On the Emission Velocities of Photo- 
Electrons: A. L]. Hughes. 
FRIDAY, June 14. 
Rovat INSTITUTION, at 9.—Unknown§Parts of South America: 
Savage Landor. 
Geotocists’ AssociaTION, at 8.—The Geology of West Beye and Sligo, 
with special reference to the August Long Excursion : Prof. G. A. J. Cole. 
Royat AsTronomicat Society, at 5.—On Librating Blanetal and ona 
New Family of Periodic Orbits: Sir G. H. Darwin.—The Sidereal 
System, revised in 1912 : “axwell Hall.—Observation of the Spectrum of 
Nova Geminorum: L. Becker.—Micrometrical Measures of Double 
Stars: Rev. T. E. R. Phillips. —Probable Papers : Note on the Spectrum 
of Nova Geminorum, April 24, 1912: Rev. A. L. Cortie.—Further 
Observations of the New Star in Gemini: A. A. Rambaut.—Occultation 
Results, January-April, rg12: M. E. J. Gheury. 
Puysicat Society, at 8,—Demonstration of a Method of Determining 
very small Differences of Density: T. H. Blakesley.--The Maximum 
Sensibility of a Duddell Vibration Galyanometer: Dr. F. H. Haworth. — 
An Accurate Examination of the Steinmetz Index for Transformer Iron, 
Stalloy and Cast Iron: F. Stroude. 
MALACOLOGICAL Society, at 8.—On a collection of Molluscs collected by 
Mr. E. Jacobson in Java: M. M. Schepman.—Description of Thirty- 
three New Species of Gastropoda from the Persian Gulf, Gulf of Oman, 
and Arabian Sea: J. Cosmo Melvill.—Note on the Generic Name 
Pectunculus ; Wm. H. Dall.—Note on Ianthina species : Tom Tredale.— 
Egyptian Non-marine Molluscs: Maxwell Smith. 
A, H 
MONDAY, June 17. 
Victor1a INSTITUTE, at 4.30.,—Annual Address : 
K.C.LE. 
Society oF CHEmIcAL InDusTRY, at 8.—The Production and Polymerisa- 
tion of Isoprene and its Homologues : W. H. Perkin.—A Hand: Photo- 
meter : W. J. Dibdin.—The Oxidation of the Drying Oils: J. Newton 
Friend and W. J. Davison. 
NO. 2224, VOL. 89] 
Sir Andrew. Wingate, 
NATURE 
[JUNE 13, Ig12 
TUESDAY, JuNE 18. 
Rovat Statistica Society, at 5.—The Measurement of Employment 
—-an Experiment: A. L. Bowley. 
MINERALOGICAL Society, at 5-30-—The Tsomorphism of the Acid Tar- 
trates and Vartar-emetics of Potassium, Rubidium and Casium: T. WV. 
Barker.—On Topaz and Beryl from the Granite of Lundy Island: W. F, 
P. McLintock and T. C. F. Hall.—On the Rathite Group: R. H. Solly, 
On the Minerals of the Nakhla Meteorite: Dr. G. T. Prior.—Note on 
the Occurrence of Cassiterite and Striiverite in Perak: J. B. Scrivenor. 
WEDNESDAY, June 19. 
Gero.ocicat Sociery, at 8.—The Discovery of a Fossil-bearing Horizon in 
the Permian Rocks of Hamstead Quarries, near Birmingham: W. H. 
Hardaker.—On the Geology and Palzontolozy of the Warwickshire 
Coalfield ;: R. D. Vernon. 
Rovat METEOROLOGICAL SOCIETY, at 4.30.—The Adoption of a Climato- 
logical Day: Walter W. Bryant.—A Three-year Period in Rainfall: 
Arthur Pearse Jenkin. 
Royat MicroscoricaL Society, at 8.—Notes on Pollen: The Rt. Hon. 
Tord Avebury.—Demonstrations of a method of obtaining Frozen 
Sections after Embedding in Gelatin: Dr. J. F. Gaskell.—On somesNew 
Astrorhizidz and their Structure : Heron-Allen and A. Earland. 
THURSDAY, JUNE 2c. 
Roya Society, at 4.30. volable Papers: An Investigation into the 
Life-history of Cladot/ dichotoma (Cohn): Dr. D. Ellis.—The 
Relation of Secretory and Capillary Pressure. I. The Salivary Secretion = 
Leonard Hill and M. Flack.—The Origin and Destiny of Cholesterol in 
the Animal Organism. Part IX. On the Cholesterol Content of the 
‘Vissues other than Liver of Rabbits under Various Diets and during 
Inanition : G. W. Ellis and J. A. Gardner.—A Note on the Protozoa from 
Sick Soils, with some Account of the Life-cycle of a Flagellate Monad = 
C. H. Martin.—Furtker Observations on the Variability of Streptococci 
in Relation to Certain Fermentation ‘lests, together with some considera- 
tions bearing upon its possible meaning : E. W. A. Walker.—The 
Chemical Action on Glucose of a Variety of B. coli communis (Escherich) 
obtained by cultivation in presence of a Chloroacetate (Preliminary 
notice): A. Harden and W. J. Penfold.—The Action of Enzymes on 
Hexosephosphate: V. |. Harding.—The Oxydases of Cytisus Adami; 
Prof. F. W. Keeble and Dr. E. F. Armstrong. 
» 
CONTENTS. PAGE 
Scientific Worthies. XXXVIII.—Dr. Alfred 
Russel Wallace, D.C.L., O.M., F.R.S. (l7th : 
Portrait.) By Prof, Henry Fairfield Osborn . . . 367 
Problems of Modern Plant Physiology. By J. B. F. 371 
Protozoology. By E,. A.M... . payed. to) Foley 1 RMI es 
Modern Explosives. By J. S. Ss. B. sige) «| apacncol CaN 
Progress of, ‘Science’. <meta) wo! vein AS 
OurBopkshelf, 2. ce eieeeie ce =) ol tel aie 
Letters to the Editor :— ; 
The Distastefulness of Dazazda (Anosia) pie aaa? 
Prof. Edward B. Poulton, F.R.S.. .. . .--. 375 
The Weather of 1911 and the Ultra- moles Baten 
of the Sun.—Dr. Carl Ramsauer .. . 2 376 
Alleged Ultra-violet Rays from Filament Lene j 
Aver irotter, «| 0 ce ig 
Earthquake of May 23. _F, mdward Naocis Bes oh/r 
Solar Halos and Mock Suns, By E.G. ...... 377 
Canadian Mineral Resources. ByJ.W.G.... . 378 
Prof. Eduard Strasburger. ByJ.B.F. ..... . 379 
NOLES a etna es 24.3 oO) 
Our Retrevomical Columat — 
NovaxGeminorum No; 22aeeeewie sc) 5) eine ennsod! 
hesMinor Planet 1917 ‘Mi eeeam os shee 
Mhesspectrum of P Cyonivaeeacmns-  . ) pecan 
Secondary Oscillations in Radial- qelbcity Curves . 385 
Congress of Universities of the Empire +. RES 
The National ive By Prof. C. H. 
WeessheR.S. ...%. s yh 386 
The Etiology of Kala-azar. py Captain w. ‘Ss. 
Pattongee.. 7 yay Sa 
University and aucational Intelligence + a, io oO 
Societiesand Academies, "yep mrmiirmo i «| nema 
BooksiReceivedi.. . ss see ol Cn oJ aD 
DiaryiofiSocieties:. . . <..7ayeuie semi (sel) OS 
