5^ 



NATURE 



[March 13, 1913 



31, igio, to December 31, 1911. Pp. iv + 663 + plates. 

 (Cape Town : Cape Times, Ltd.) 



L.M.B.C. Memoirs of Typical British Marine 

 Plants and Animals, xxi., Eupaguans. By Dr. G. 

 Jackson. Pp. viii + 79 + vi plates. (London: Williams 

 and Norgate.) 2s. 6d. 



Philips 's Panama Canal Route Globe. (London : 

 G. Philip and Son, Ltd.) 2s. 6d. net. 



The Economics of Everyday Life : a First Book of 

 Economic Study. Part i. By T. H. Penson. Pp. 

 xiv+ 174. (Cambridge University Press.) 3s. net. 



The Manufacture of Sulphuric Acid and Alkali with 

 the Collateral Branches. By Prof. G. Lunge. Fourth 

 edition. Vol. i., part i. Pp. xxiv + 582. Part ii. 

 Pp. xii + 583-1078. Part iii. Pp. xii+ 1079-1617. 

 (London : Gurney and Jackson.) 3L 3s. net. 



Verhandlungen des Naturhistorischen Vereins der 

 preussischen Rheinlande und Westfalens. Neunund- 

 sechzigster Jahrgang, 1912. Erste Halfte. Pp. lv + 

 223 + plates. (Bonn : F. Cohen.) 



Technical School Organisation and Teaching. By 

 C. Hamilton. Pp. xii+178. (London: G. Routledge 

 and Sons, Ltd.) 2s. 6d. net. 



Anleitung zur Kultur der Mikroorganismen. By 

 Dr. E. Kiister. Zweite Auflage. Pp." v 4- 2 18. (Leip- 

 zig and Berlin : B. G. Teubner.) 8 marks. 



The Organometallic Compounds of Zinc and Mag- 

 nesium. By Dr. H. Wren. Pp. viii+100. (Chem- 

 ical Monographs.) (London : Gurney and Jackson.) 

 is. 6d. net. 



La Tel£graphie et la Telephonie Simultanees et la 

 Tetephonie Multiple. By K. Berger. Pp. 134. 

 (Paris : Gauthier-Villars.) 4.50 francs. 



Les Appareils D'Integration. By H. de Morin. 

 Pp. 208. (Paris : Gauthier-Villars.) 5 francs. 



Aus Natur und Geisteswelt. Band 393, Die Dampf- 

 maschine. By Prof. R. Vater. Dritte Auflage. Pp. 

 vi+104. (Leipzig and Berlin: B. G. Teubner.) 1.25 

 marks. 



First-Year Course in General Science. By E. A. 

 Gardiner. Pp. vi+113. (London: W. Heinemann.) 

 2s. 6d. net. 



DIARY OF SOCIETIES. 



Period of Stabl. 

 Gases : Prof. J. 1 

 Circular Coils of R. 

 Ferrous Sulphate an 

 —The Re 



THURSDAY, March 13. 

 i.30.— A Simple Method of Findin, 

 Syst 



the 



Approximate 



Mallock.— The Motion of Electrons in 



Townsend and H. T. Tizard.— The Self Inductance of 



tangular Section: Prof. T. R. Lyle.— Ammonium 



its Alkali-Metal Isomorphs : Dr. A. K. H. Tutton. 



of the Ions produced by Runtgen Rays in Gases 



and Vapours : H. Thirkill.— Optical 



III. The Crystal-properties of Chi irine and Bromide : Dr. 



Royal Institution, at 3.— Surface Energy : W. B. Hardy. 



Institution of Electrical Engineers, at S. — Power Supply on the 

 Rand : A. E. Hadley. 



Concrete Institute, at 7.30.— The Strength of Cement : H. C. Johnson. 



Institution of Mining and Metallurgy, at 8.— Annual General 

 Meeting. 



Mathematical Society, at 8. — Some Cases of Tidal Motion of Rotating 

 Sheets of Water : J. Proudinan. — Indeterminate Equations of the Third 

 and Fourth Degree : L. J. Mordell. 



Society of Dyers and Colourists, at 8. — Stripping Agents for Garment 

 Dyers : F. G. Newbury.— A Few Notes on Fur Dyeing : M. C Lamb. 

 3j •-.»? k-^.„„..„- i FRIDAY, March 14. 



Royal Institution, at 9. — Great Advance in Crystallography : Dr. A. E. H. 

 Tutton. 



Institution of Mechanical Engineers, at 8 

 heating and Feed-water Heating on Locoi 

 Trevithick and P. I. Cowan. 



Physical Societv (University College, Gower Street), at 5.— Demonstra- 

 tion of Spark Photographs: W. B. Haines.-(i) Some Oscillograms of 

 Condenser Discharges and a Simple Theory of Coupled Circuits ; (2) Ex- 

 hibition of Braun Kathode-Ray Tubes and an Electrostatic Machine for 

 Working them, used as a High-frequency Oscillograph : Prof. J. A. 

 Fleming.— The Stretching and Breaking of Sodium and Potassium : B. B. 

 Baker. — The Latent Heat of Evaporation of Aqueous Salt Solutions : 

 R. G. Lunnor.— Some Flame Spectra : Dr. E. N. da C. Andrade. 



Royal Astronomical Society, at 5.— The Sounds Alleged to Accompany 

 Flights of Meleors: A. King.— Note on the Possibility of Refraction by 

 tbe Sun's Atmosphere. Papers of the I. U.S.R. No. VIII. : R. S. Capon. 

 —Observations of Gale's Comet: Sydney Observatory.— A Family of 

 Oscillating Orbits of Short Period ; H. R. Willard.— Note on the Nebula 

 HI Cassiopeia: : Mrs. Isiac Roberts.— Notes on Fireballs and Shooting 



NO. 



2263, VOL. 91] 



Stars : W. F. Denning.— The Variable Star R Cygni : E. E. Barnard.— 

 A Formula for Correcting Statistics for the Effects of a Known Probable 

 Error of Observation : A. S. Eddington.-Pro/-ai/e Papers: Observa. 

 lions made with the Durham Alm'icantar during 1912 : E. H. Hills and 

 F. C. H. Carpenter.— Enhanced Lines in the Early Spectrum of Nova 

 Ceminorum 0.0. 2 : H. F. Newall and F. J. M. Stratton —The Distribu- 

 tion in S| ace of the Stars of Carringt .n's Cireumpolar Catalogue: F. W. 

 Dyson.— The Distribution in Space of the Bright Stars : A. S. Eddington. 

 — Report on the Expedition to Passu Quatro, Brazil, to observe the Total 

 Solar Eclipse of 1912 (October 10) : A. S. Eddinglon and C. Davidson. 

 SATURDAY, March 15. 



Royal Institution, Gt 3- — The Properties and Constitution of the Atom : 

 Sir J. J. Thomson, O.M. 



MONDAY, March 17. 



Victoria Institute, at 4.30 — The Bearing of Archaeological and His- 

 torical Research on the New Testament : Rev. Parke P. Flournoy. 

 TUESDAY, March 18. 



Royal Statistical Societv. at 5. — Some Statistical Problems suggested 

 by the Sickness and Mortality Data of Certain of the Large Friendly 

 Societies : Dr. E. C. Snow. 



Zoological Society, at 8.30. — Remarks on the Relationship of the Big 

 Game of Africa to the Spreading of Sleeping Sickness : Dr. W. Yorke.— 

 Variations in the Skeleton of the Pectoral Fins of Polypterus : Edith E. 

 Bamford.— A Descriptive Study of an Oligoehste Worm of the Family 

 Knchvtra.-idse : H. H. Stirrup. -(1) A Collection of Fishes made by Prof. 

 Francisco Fuentes at Easter Island ; (2) A Revision of the Fishes of the 

 Genus Kuhlia: C.Tate Regan.— The Polyzoa of Waterworks : Dr. S. F. 

 Harmer. 



Institution of Civil Engineers, at 8. — Further Discussion : Notes on 

 City Passenger-Transportation in the United States : G. D. Snyder. 

 WEDNESDAY, March 19. 



Entomological Society, at 8.— The Classification of the British Crabro- 

 nida:(Hymenoptera): Dr. R. C. L. Perkins. 



Geological Society, at 8.— The Geology of Northern Peru : Tertiary 

 and Quaternary Birds : Beeby Thompson. — The Internal Cranial Elements 

 and Foramina of Dapedius Cranulatus : G. Allan Frost. 



CONTENTS. page 



The Philosophy of Energy. By E. E. Fournier d'Albe 27 

 The Present Position of Radio-activity. By Hon. 



R.J. Strutt, F.R.S 28 



Map Projections. By H. G. L 29 



Our Bookshelf 30 



Letters to the Editor: — 



The Radio-elements and the Periodic Law. — Prof. 



Arthur Schuster, F.R.S 30 



Atmospheric Electrification during South African Dust 

 Storms. [With Diagram.)— Prof. W. A. Douglas 



Rudge 31 



InducedCell-reprodtictioninlheProtozoa. — T. Goodey 32 

 The Spectra of Neon, Hydrogen, and Helium. — Prof. 



Norman Collie, F.R.S ; Hubert S. Patterson 32 



Mountain Stream Tadpoles in Naial. — John Hewitt . 33 

 International Time and Weather Radio-Telegraphic 

 Signals. (With Diagrams.) By Dr. William J. S. 



Lockyer 34 



Notes . 36 



Our Astronomical Column : — 



The Use of a Plane Grating in Stellar Spectroscopy . . 41 



Observations of the Zodiacal Light 41 



Astronomical Time-installations 4 1 



Ornithological Notes. By R. L 41 



Forthcoming Books of Science 42 



Recent Advances in Scientific Steel Metallurgy. (Il- 

 lustrated.) By Prof. J. O. Arnold, F.R.S 45 



University and Educational Intelligence 49 



Societies and Academies 51 



Books Received 51 



Diary of Societies 52 



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Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



