392 



NATURE 



[June 12, 1913 



Memoirs of the Geological Survey. England and 

 Wales. The Concealed Coalfield of Yorkshire and 

 Nottinghamshire. By Dr. W. Gibson. Pp. vi+122-f- 

 iii plates. (London : H.M.S.O. ; E. Stanford, Ltd.) 

 is. 6d. 



Annual Report of the Council of the City and 

 Guilds of London Institute. Pp. xlix+ 125. (London : 

 Leonard Street, E.C.) 



Weights and Measures Act, 1904. Board of Trade 

 Notices Annotated. By H. Cunliffe and G. A. Owen. 

 Vol. i. Pp. viii+199 + vii plates. (Smethwick : H. 

 Cunliffe.) 5s. net. 



A Bibliography of the Tunicata, 1469-1910. By J. 

 Hopkinson. Pp. xii + 288. (London: The Ray 

 Society; Dulau and Co., Ltd.) 15s. net. 



Tanners' Year Book, 1913. Pp. 178. (London : 

 The Technica Publishing Company.) 



Hausa Folk-Lore, Customs, Proverbs, &c. Collected 

 and Transliterated with English Translation and 

 Notes. By R. S. Rattray. 2 vols. Vol i., pp. xxiv + 

 327. Vol ii., pp. 315 + iii plates. (Oxford : Clarendon 

 Press.) 2 vols., 30s. net. 



Handbuch der Pharmakognosie. By A. Tschirch. 

 Lief. 31-34. (Leipzig: C. H. Tauchnitz.) 



Metallographie. By Dr. W. Guertler. Erster Band, 

 Die Konstitution. Heft 7-12. (Berlin : Gebriider 

 Borntraeger.) 



Yorkshire Type Ammonites. Edited by S. S. 

 Buckman. Part ix. (London : W. Wesley and Son.) 



Outlines of Stationery Testing. Bv H. A. Brom- 

 ley. Pp. 74. (London': C. Griffin and Co., Ltd.) 

 2X. 6d. net. 



The Earth : its Genesis and Evolution. By A. T. 

 Swaine. Pp. xviii4-2774-xii plates. (London : C. 

 Griffin and Co., Ltd.) 75. 6rf. net. 



Electricity in Mininer. Bv Siemens Brothers 

 Dynamo Works, Ltd. Pp. xiv + 201. (London: C. 

 Griffin and Co., Ltd.) ios. 6d. net. 



Einfiihrung in die Spektrochemie. By Prof. G. 

 Urbain. Pp. viii + 2 13 4- 9 plates. (Dresden and 

 Leinzig : T. Steinkopff.) 9 marks. 



The Oxford Geographies : — A Commercial Geo- 

 graphy of the World. By O. J. R. Howarth. Pp. 

 236. (Oxford : Clarendon Press.) 2s. 6d. 



DIARY OF SOCIETIES. 



THURSDAY. ]v\f 12. 



Royal Society at 4-W.— Recent Researches on the Palatine in Relation 

 to Geology, Ethnology, and Physics : Commendatore Boni.— The Growth 

 and Spoliation of the Benign and Malignant Tertian Malarial Parasites 

 in the Culture Tube and in the Human Host : J. G. Thomson and 

 D. Thomson. 



Mathematical Society, at 5.30.— The Electromagnetic Force on a 

 Moving Charge in Relation to the Energy of the Field : Sir J. Larmor 

 — Eini-o Ungleichungen fur zweimal differen'ierbare Funktionen : Prof. 

 E- I.audau.-(i) The Fractional Part of «*» ; (2) The Trigonometrical 

 Series Associated with the Elliptic 0-functions : G. H. Hardy and I E. 

 Littlewood.— A Proof that every Equation of Degree n has ;; Roo's "Real 

 or Imaginary: W. N. Roseveare.— The Evaluation of a Certain Definite 

 Integral : J. Hammocd.— Foucault's Pendulum : Dr. T. J. I'A. Bromwich. 

 FRIDAY, June 13. 



Roval Astronomical Society, at 5.— Note on Variable Stars of Cluster 

 Type: H. C. Plummer.— The Determination of Maxima and Minima of 

 Variable Stars of Long Period: M. E. J. Gheury.— A Photographic 

 Determination of the Pr per Motion of 2so Stars in the Neighbourhood 

 of S 443: A. A. Rambaut.— The Plan-i Jupiter in 1890: A. Stanley 

 Williams.-The Origin of Solar Electricity: J. A. Harker.-Note on a 

 Method of Balancing Dome Shutters: W. H. Maw.— Devices for Sub- 

 tabulation ' T. C. Hudson.— Some Spectrographs Measures of the Solar 

 Rotation at the Kodaikanal Observatory: J. Eversbed and T. Royds.— 

 Preliminary Results of Observations made with the Cookson Floating 

 Zenith Telesc pe : A. S. ¥.Ad\n%lon.- ProhaHe Papers : The Spectrum 

 of Nova Geminorum N'o. 2, 1912, April, and 1913, February-April: Rev. 



A. L.Cortie.— The Position of the Sun's Axis as Determined from Photo- 

 graphs of the Sun from 1874 to 1912 : F. W. Dyson. 



Malacological Society, at 8.— Note on the Genus Pseudomalaxis 

 Fischer, and Descriptions of a New Species and a New Subgenus : 

 Marques de Monterosato. — Note on the Freshwater Mollusc.! found with 

 Utiio Auriculatus, Spengl, at Barn Elms. Surrey: A. S. Kennard and 



B. B. Woodward.— The Land Mollusca of the Kermadec Islands: Tom 

 Iredale.— Definitions of Further New Genera of Zonitida: : G. K. Gnde. 



Physical Society, at 8 —Some Experiments on Tinfoil Contact with 

 Dielectrics: G. E. Rairsto.— A Method of Measuring the Pi 

 Light by Means of Metal Foil : G. D. West. 



MONDAY, June 16. 



Victoria Institute, at 4.30. — From Suez to Sinai : A. W. Sutton. 

 TUESDAY, June 17. 



Mineralogical Society, at s.30. — The Crystal habit of Topaz from New- 

 Brunswick, Canada: H. V. Ellsworth.— (1) The Meteoric Stone 01 Baroti, 

 Punjab; (2) Mineralogical Notes: Dr. G. T. Prior.— Photographs 

 illustrating Crystal-structure as Revealed by Rcintgen Radiation : W. L. 

 Bragg. 



Royal Statistical Society, at 5. — The Trade of the British Empire: 

 Simon Rosenbaum. 



WEDNESDAY, June 18. 



Roval Microscopical Society, at 8.— (1) The Measurement of Working 

 Aperture; (2) A Method of Investigating Diatom Stiu< ture : Hamilton 

 Hartridge.— The Higher Bacteria (Sphaeroiilus) : E. Moore Mumford.— 

 The Structure of the Nucleus: E. J. Sheppard. 



Royal Meteorological Society, at 4.70. — Pilot Balloon Observations 

 in Barbados, 1910-1912: J. S. Dines.— The Harmattan Wind of the 

 Guinea Coast : H. W. Braby.— The Correlation of Rainfall: J. Peek and 

 Dr. E. C. Snow. 



THURSDAY, June 19. 



Royal Society, at 4.30.— Probable Paters: Atomic Specific Heat* 

 between the Boiling Points of Liquid Nitrogen and Hydrogen. I. The 

 Mean Atomic Specific Heats at 50° Absolute of the Elements a Periodic 

 Function of the Atomic Weights : Sir James Dewar.— An Active Modifi- 

 cation of Nitrogen produced by the hlectric Discharge. V. : Hon. R. J. 

 Strutt.— The Electrical Emissivity and Disintegration of Hot Metals : 

 Dr. J. A. Harkerand Dr. G W. C. Kaye.— A Method of Measuring the 

 Vise -it v of the Vapours of Volatile Liquids, with an Application to 

 Broa.ine : Dr. A. O. Rankine.-The Efficiency of Selenium as a Detector 

 of Light : E. E. Founder d'Alhe.— Synthesis of the Anhydrides of 

 a Aminoacyl Glucosamines : A. Hopwood and C. Weizmann.— The Flexure 

 of Telescope Mirror-discs arising from their Weight, and its Influence 

 upon Resolving Power: H. S. Jones.-(i) A Condition that a Trigono- 

 metrical Series should have a certain Form ; (2) Trigonometrical Series 

 the Cesaro Partial Summations of vhich Oscillate Finitely: Prof. 

 W. H. Young. 



Linnean Society, at 8.— Impressions of the Feeding-tracks of LimtLX 

 maximus and Helix aspersa : Mrs. Longstaff. — African Species 'of the 

 Genus Crotalarta : E. G. Baker — Aphareocaris, nom. nov. (Apbareus, 

 Paulson), a Genus of the Crustacean Family Sergestida: : Dr. W. T. 

 Caiman.— Water-colour Drawings of Australian and South African: 

 Plants: Miss Fuller. — An Anatomical Study of the Cone-genus Lepi- 

 dostrobus : Dr. Agnes Arber.— Fresh-water Rhizopoda from North and 

 South America : G. H. Wailes.— A Revision of the Genus Symphytum, 

 Tourn. : Cedric Bucknall.— Some New British Plants: Dr. C. E. AIoss. 



NO. 2 2/6, VOL. Ql] 



CONTENTS. page 



Seeds of Flowering Plants 367 



Engineering Science. By H. E. W 367 



Palaeolithic Man and Bionze Age Man 368 



Mathematical Text-books 369 



Our Bookshelf 370 



Letters to the Editor: — 



The Ionisation of Gases in the Schumann Region. — 



Prof. Theodore Lyman 371 



Artificial Hiss.— E. R. Marie; H. L. Kiek ... 371 



Red Water. — Fred Whitteron 372 



Phreatoicus in South Africa. — Keppel H. Barnard. 372 

 Geography and Travel. {Illustrated.) By G. A. J. C." 372 

 The Birmingham Meeting of the British Associa- 

 tion. By F. W. G 374 



Microscope Stands 376 



Notes '377 



Our Astronomical Column : — 



The Variation of Solar Radiation 381 



Prominences Associated with Sun-spots 381 



Studies in Stellar Statistics 381 



Recent Observations of Novae 3S2 



The National Physical Laboratory during 1912. 



{Illustrated.) 382 



The Royal Observatory, Greenwich 3S4 



Ornithological Notes. Bv R. L 3S5 



The American Philosophical Society 3S5 



University and Educational Intelligence 388 



Societies and Academies 389 



Books Received 391 



Diary of Societies 392 



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Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



