444 
NATURE 
[DECEMBER II, 1913 
Photo-Electricity : the Liberation of Electrons by 
Light. By Dr. H. S. Allen. Pp. 219. (London: 
Longmans and Co.) 7s. 6d. net.. . 
Modern Seismology. By G. W. Walker. Pp. xii+ 
88+ plates. (London: Longmans and Co.) 5s. net. 
Heredity and Sex. By Prof. T. H. Morgan. Pp. 
ix+282. (London: Oxford University Press.) 7s. 6d. 
net. 
The Life of the Mollusca. By B. B. Woodward. 
Pp. xi+158+xxxii plates. (London: Methuen and Co., 
Ltd.) 6s. 
Ordnance Survey. Professional Papers. New series. 
No. 2, An Investigation into the Accuracy of the 
Principal Triangulation of the United Kingdom. By 
Capt. H..St. J. L. Winterbotham. Pp. 20+v plates. 
(London: H.M.S.O.; Wyman and Sons, Ltd.) 2s. 
Rays of Positive Electricity and their Application 
to Chemical Aralyses. By Sir J. J. Thomson. Pp. 
vi+132. (London: Longmans and Co.) 5s. net. 
Plant Physiology. By Dr. L. Jost. Authorised 
English translation by -R. J. Harvey Gibson. Supple- 
ment incorporating the alterations of the second 
edition of the German original. Pp. 168. (Oxford: 
Clarendon Press.) 2s. 6d. net. 
DIARY OF SOCIETIES. 
THURSDAY, DeEcemeer 11. 
Roya Society, at 4.30.—Intermittent Vision : A. Mallock.—Attempts to 
Observe the Production of Neon or Helium by Electrical Discharge : 
Hon. R. J. Strutt.—The Relations between the Crystal-symmetry of the 
Simpler Organic Compounds and their Molecular Constitution : W. 
Wahl.—The Selective Absorption of Ketones : Prof. G. G. Henderson and 
I. M. Heilbron.—Absolute Measurements of a Resistance by a Method 
based on that of Lorenz: F. E. Smith.—A Determination of the Electro- 
motive Force of the Weston Normal Cell in Semi-absolute Volts, (With 
a Preface by Prof. H. L. Callendar, F.R.S.): A. N. Shaw.—Elastic 
Hysteresis in Steel: F, E. Rowett.—A Simple Form of Micro-balance for 
Determining the Densities of Small Quantities of Gases: F. W. Aston.— 
A Second Spectrum of Neon: T. R. Merton. 
MATHEMATICAL SocieTy, at 5.30.—The Linear Integral Equation : Prof. 
E. W. Holson.—Generalised Hermite Functions and their Connection 
with the Bessel Functions: H. E. J. Curzon.—-Limiting Forms of Long 
Period Tides ::J. Proudman.—The Number of Primes of Same Residu- 
acity: Lieut -Col. Cunningham.—Some Results on the Form Near 
Infinity of Real’Continuous Solutions of a Certain Type of Second Order 
Differential Equations : R. H. Fowler.—The Potential of a Homogeneous 
Convex Body and the Direct Integration of the Potential of an Ellipsoid ; 
S. Brodetsky.—The Dynamical Theory of the Tides in a Polar Basin: 
o a Goddsbrough.—Proof of the Complementary Theorem : Prof. J. C. 
1elds, 
Gale InstTITUTE, at 7.30.—Some Fallacies in Testing Cement: L. 
add. 
Roya Society or Arts, at 4.30.—The Cultivation and Manufacture of 
Indian Indigo: Prof W. P. Bloxam. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—Continuation of Dis- 
ae on Dr. Klingenberg's Address on ‘‘ Electricity Supply in Large 
ities.” 
FRIDAY, DeEcEMBER 12. 
Rovat Asrronomicat Society, at 5.—The “Kinetic Theory” of Star 
Clusters; J. H. Jeans.—Distribution of Sun-spots in Heliographic Lati- 
tude, 1874-1913: FE. W. Maunder.—Results of Micrometer Measures of 
Double Stars made with the 28-inch Refractor at the Royal Observatory, 
Greenwich, in the Year 1912: Royal Observatory, Greenwich.—Probable 
Pagers: An Explanation of Sun-spots, of the Fluctuations of the Moon's 
Motion, and some other Puzzles of the Solar System : H. H. Turner.— 
The Spectra of the Wolf-Rayct Stars: J. W. Nicholson.—The Equatorial 
Current of Jupiter: Rev. T. E. R. Phillips. 
Mavacotocicat Society, at 8.—Descriptions of Various New Species of 
Mollusca: G. B. Sowerby.—Synonymy of the Family Veneride: A. “i 
Jukes-Browne — Descriptions of New Species of Land and Marine 
Shells from the Montebello Islands, Western Australia: H. B. Preston. 
ALCHEMICAL Society, at 8.15.—Alchemy in China: Prof. H. Chatley. 
MONDAY, DECEMBER 15. 
Royat Society oF Arts, at 8.—The Measurement of Stresses in Materials 
and Structures : Prof. E. G. Coker. 
TUESDAY, DECEMBER 16. 
Roya. ANTHROPOLOGICAL INSTITUTE, at 8.15.—A Rough Survey of the 
Tribes of Western Papua: W. Beaver.—The Nomenclature of Clans in 
the Pueblo Area: Miss B. Freire Marreco.—Arctic Hysteria in Northern 
Asia: Miss M. A. Czaplicka. 
Royat Geocrarnicat Society, at 4.30.—Further Explorations in the 
N.W. Amazons Valley: Dr. Hamilton Rice. 
Royat. Sraristicat Socigry, at 5.—Cooperative Live Stock Insurance in 
England and Wales: Sir James Wilson.—Some Material for a Study of 
Trade Fluctuations: D. H. Robertson.—The Deteriination of Size of 
Family, and Incidence of Characters in Orders of Birth from Samples : 
M. Greenwood and G. Udny Yule. 
ILLUMINATING ENGINEERING SociEry, at 8.—Some Problems in Daylight 
Illumination, with Special Reference to School Planning: P. J. Waldram 
InstiTuTION OF Civit ENGINEERS at 8.—Cyclical Changes of Temperature 
in a Gas-engine Cyliuder: Prof. E. G. Coker and W. A. Scoble. 
NO. 2302, VOL. 92] 
WEDNESDAY, DECEMBER 17. s 
RovaL METEOROLOGICAL Society, at 7.30.—The Great Rain Storm at 
Doncaster, September 17: R. C. Mossman and C, Saltet.—Recent 
Studies of Snow in the United States: Dr, J. E. Church, Jun.—The 
Meteorological Conditions of an Ice-Sheet, amd their Bearing on the 
Desiccation of the Globe: C. E. P, Brooks. : : 
AERONAUTICAL SocIETY, at 8.30.—The Science of Fast Flying: C. T 
Weymann. 
Rovat Society oF Arts, at 8.—The Channel Tunnel : A. Fell. 
GEOLOGICAL Society, at 8.—Supplementary Note on the Discovery of a 
Palzeolithic Human Skull and Mandible at Piltdown (Sussex) : C. Dawson 
and Dr. A. Smith Woodward. 5 
Royat Microscoricat Society, at 8.—The Binocular Microscopes of the 
Past and a New form of the Instrument: Conrad Beck. 
THURSDAY, DeEcEMpER 18. 
INSTITUTION OF ELECTRICAL ENGINEERS, at 8.—The Employment of 
Power in H.M. Post Office: H. C. Gunton. “a 
Roya GroGRaAPHICAL Society, at 5.—The Standardising of Colours and 
Symbols representing Geographical Data, especially on Small Scale Maps: 
Prof. A. J. Herbertson. ; 
Linnean Society, at 8.—The Evolution of the Inflorescence: J. Parkin. 
—Hypericum desetangsiz, Lamotte, a New British Plant: C. E. Salmon. 
—The Mouth-parts and Mechanism of Sucking in Schizoneura lanigeva: 
J. Davidson. 
INSTITUTION OF MINING AND METALLURGY, at 8. 
FRIDAY, DECEMBER 19. Z = F 
INsTITUTION OF MecHanicat. ENGINEERS, at 8.—Mechanical Engineering 
Aspects of Road Construction: Col. R. E. B. Crompton. iA. 
INSTITUTION OF CiviL ENGINEERS, at 8.—Air-filtration and the Cooling 
and Ventilation of Electrical Machines: W. E. Gurry, : 
CONTENTS. 
The New Physical: Chemistry 24:55 ys «cee 
Veterinary Physiology .... 3.5. 1.2). see 
Popular Astronomy. By William E, Rolston . . . 420 
Gur; Bookshelf... yo) -<. ya) au aiale ot =) ive tat 
Letters to the Editor :— i : 
The Structure of the Atom.—Prof. E. Rutherford, 
PAGE 
419° 
BOR... ss oie og se gt ee 
The Reflection of X-Rays.—Maurice de Broglie ; 
BE. Jacot. . 2 604.) 2%) hee ia ee 
Residual Ionisation inGases.—Prof. J.C. McLennan 424 
The Nile Flood of 1913.—H. E. Hurst. ...  . 
Pianoforte Touch.—Spencer Pickering, F.R.S.; 
Prof. G. H. Bryan, F;R:S. \\. ©. Cie 
Memorials.—Prof. R. 
Alfred Russel Wallace 
Meldola, F.R.S., Prof. E. B. Poulton, F.R.S., 
and Rev, James Marchant 3 sta” 0) ie ao 
Distance of the Visible Horizon.—R. Langton Cole 425 
The Problem of the University of London ... . 426 
The Plumage Bill. By Sir H. H.. Johnston, 
GICiM.G., K.C.B. <<) 4) es ia-te co) +) ) oe 
INGEER 6. scsi a la, het Rotem aie ck ann 
Our Astronomical Column :— 
The Structure of the Universe ..... . . . 0. 434 
Journal of the Royal Astronomical Society of Canada 434 
New Nebulz and Variable Stars ......+. + + 434 
‘Watts’s Index of Spectra .>. 2 © « .) = ese 
Secular Desiccation of the Earth. By E.G. .. . 435 
Astronomy in South Africa 2... . 2). . 4 Sieur 
The Originof Argentine Horses ......... 
French Hydrology. ByB.C...... 
Economic Geology of Paptia.. .< 9 >): 0am 
Meteorology and Geophysics at the British Asso- 
ciation... © 8 ayes 
Geography at the British Association ....... 437 
University and Educational Intelligence. ..... 
Societies and Academies’. ...: . «5. - = 
Books, Received . 2 2a 'j)ei a 4 ik cho beeen 
Diaryior Societies: ....\\5.\5, sesame: uae 
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