582 



NATURE 



[January 21, 191 5 



The Laws of Algebra. By A. G. Cracknell. Pp. 

 vi + 68. (London : University Tutorial Press, Ltd.) 



IS. 



The Substance of Faith Allied with Science. By 

 Sir Oliver Lodge. Cheap edition. Pp. xii+135. 

 (London : Methuen and Co., Ltd.) \s. net. 



Bacon's 6d. Contour Atlas. South Scotland edition. 

 (London : G. W. Bacon and Co., Ltd.) 6d. net. 



A Manual of Chemistry, Theoretical and Practical, 

 Inorganic and Organic. By Dr. A. P. Luff and 

 H. C. H. Candy. Fifth edition. Pp. xix + 660. 

 (London : Cassell and Co., Ltd.) 85. 6d. net. 



Proceedings of the London Mathematical Society. 

 Second series. Vol. xiii. Pp. liii + 500. (London: F. 

 Hodgson.) 25s. 



Mutual Aid : a Factor of Evolution. By P. Kro- 

 potkin. Popular edition. Pp. x + 240. (London : W. 

 Heinemann.) is. net. 



Annuaire pour I'an 1915. Publie par le Bureau des 

 Longitudes. (Paris : Gauthier-Villars et Cie.) 



Workshop Arithmetic. By F. Castle. Pp. viii + 

 172. (London : Macmillan and Co., Ltd.) 15. 6d. 



Plane Trigonometry. By Prof. H. S. Carslaw. 

 New edition. Pp. xviii + 293 + Answers, pp. xi. (Lon- 

 don : Macmillan and Co., Ltd.) 4s. (id. 



Solutions to the Questions in Plane Trigonometry. 

 By Prof. H. S. Carslaw. Pp. 179. (London : Mac- 

 millan and Co., Ltd.) 65. 6d. net. 



The Home of the Blizzard : being the Story of the 

 Australasian Antarctic Expedition, 1911-14. By Sir 

 D. Mawson. Vol. i. Pp. xxx + 349. Vol. ii. Pp. 

 xiii + 338. (London : W. Heinemann.) Two vols., 

 36s. net. 



Wild Life Conservation in Theory and Practice. 

 By Dr. W. T. Hornaday. With a chapter on Private 

 Game Preserves, by F. C. Walcott. Pp. vi + 240. 

 (New Haven, Conn. : Yale University Press ; Oxford 

 University Press.) 6s. 6d. net. 



DIARY OF SOCIETIES. 



THURSDAY, January 21. 



Royal Society, at 4.30. — Atmospheric Electricity Potential Gradient at 

 Kew Observatory, 1S98-1912 : Dr. C. Chree. — The Transmission of 

 Electric Waves over the Surface of the Earth : Prof. A. E. H. Love. — 

 Electromagnetic Waves in a Perfectly Conducting Tube : L. Silberstein. 

 An Electrically-heated Full Radiator : H. B. Keene. 



Royal Institution, at 3. — Modern Theories and Methods in Medicine : 

 H. G. Plimmer. 



Royal Society of Arts, at 4.30. — Nepal : H. J. Elwes. 



LiNNEAN Society, at 5. — Report on the Fishes Collected by Mr. Cyril 

 Crossland in the Sudan: Miss Ruth C- Bamber. — Narrative of his 

 Recent Visit to the Houtman Abrolhos Archipelago, West Australia : 

 Prof. W. J. Dakin. 



Institution op Mining and Metallurgy, at 8. — Inflammable Natural 

 Gas as an Economic Mineral : J. A. Leo Henderson and W. H. Henderson. 

 —Investigations in Ore Milling to ascertain the Heat Developed in Crush- 

 ing : J. Cook. 



FRIDAY, January 22. 



Royal Institution, at 9. — Problems of Hydrogen and the Rare Gases : 

 Sir J. Dewar. . 



Institution of mechanical Engineers, at 8.— Standardisation of Pipe 

 Flanges and Flanged Fittings: J. Dewrance. 



Physical Society, at 5.— Practical Harmonic Analysis: Dr. A. Russell. 

 — Measuring the Focal Length of a Photographic Lens : T. Smith. 



SA TURD A V January 23. 

 Royal Institution, at 3. — Aerial Navigation — Scientific Principles : Dr. 



R. T. Glazebrook. 



MONDAY, January 25. 

 Royal Society of Arts, at 8. — Oils, their Production and Manufacture : 



Dr. F. Mollwo Perkin. 

 Royal Geographical Society, at 8.30. — The Historical and Physica 



Geography of the Theatres of War : Dr. Vaughan Cornish. 

 Institute of Actuaries, at 5. — The Analysis of Life Oflice Expenses: 



C. H. Maltby. 



TUESDAY, January 26. 

 Royal Institution, at 3. — Muscle in the Service of Nerve : Prof. C. S. 



Sherrington. 

 Royal Anthropological Institute, at 8.30. — President's Address: 



The Slav and Allied Racial Elements in the Peoples of Western Europe : 



Dr. A. Keith. 

 Royal Society of Arts, at 4. 30. — The Economic Development of British 



East Africa and Uganda : Major E. H . M. LeBgett. 

 Wireless Society, at 8.— Presidential Address : Some Electrical 



Phenomena: A. A. Campbell Swinton. 

 MiNERALOGiCAL SOCIETY, at 5. 30. — Note On the Colour of some Alluvial 



Diamonds and Pyrrhotite : F. P. Mennell. — (i) Crystals of Calomel from 



Spain : (2) General Formula for the Birefringence of a Crystalplate in 

 terms of the Angles which its normal makes with the Optical Pruicipal 

 Axes: (3) A Numerical Relation of the Sum of the Symm:!ir)-axes 

 situated in the Symmetry-planes of a Polyhedron : Prof. G. Cesaro. 



Institution of Civil Kngineers, at Z.— Discussion: The Lateral Pressure 

 and Resistance of Clay, and the Supporting Power of Clay Foundations : 

 A. L. Bell.— /'rt/<rr.- Engineering Operations for the Prevention of Malaria : 

 F. D. Evans. 



WEDNESDAY, January 27. 



Royal Society of Arts, at 8.— Portrait Painting : the Technique of the 

 Great Masters: Hon. John Collier. 



THURSDAY, January 28. 



Royal Society, at ^.-^o.— Probable Papers: The Influence of Salt-con- 

 centration on Hemolysis: W. W. C. Topley.— The Life-cycle of 

 Cladocera, with Remarks on the Physiology of Growth and R. production 

 in Crustacea : G. Smiih.— Investigations on Protozoa in relation 10 ihe 

 Factor limiting Bacterial Activity in Soil : T. (Joody.— On the .Mtso- 

 dermic Origin and the Fate of the so-called Mesectoderni in Petromyzon : 

 S. Hatta.— The Influence of Direction of Homodromous and Hetero- 

 dromous Electric Currents on Transmission of Excitation in Plant and 

 Animal: Prof. J. C. Bose. ... ., .• • 



Royal Institution, at 3.— Modern Theories and Methods m Medicine — 

 Immunity : H. G. Plimmer. -.,„,-, 



Institution OF Electrical Engineers at 8.— The Sixth Kelvin Lecture. 

 Lord Kelvin's Work on Gyrostatics : Prof. A. Gray. 

 FRIDAY, January 29. 



Royal Institution, at 9. — Gaseous Explosions : Dr. Dugald Clerk. 

 SATURDAY, January 30. 



Royal Institution, at 3.— Aerial Navigation— Scieniific Principles : 

 Dr. R. T. Glazebrook. 



CONTENTS. PAGE 



The Manufacture of Dyestuffs in Britain: A Sum- 

 mary and an Appeal. By Prof. Walter M. 



Gardner 555 



Electromagnetic Waves. By C. G, K 557 



The Ascent of Sap in Plants. By F. D 558 



The Schumann Region of the Spectrum 559 



Our Bookshelf S^o 



Letters to the Editor :— 



Electrical Notation.— Sir J. Larmor, F.R.S. . . 561 

 The Influence of Icebergs on the Temperature of the 



Sea —Dr. John Aitken, F.R.S 5^1 



The Longevity of Seeds.— Right Hon. Sir Herbert 



Maxwell, Bart., F.R.S 562 



S. T. Coleridge and the Immortality of the Protozoa. 



—Prof. D'Arcy W. Thompson, C.B. . .562 

 The Cause of Streaks upon Lath-and-Plaster Walls.— 



Thomas D. Cope 562 



Curious Forms of Ice. {With Diagram).— Q. M. 



Davies „" " ' ;«" ^ -^ 



The Fireball of December 31, 1914.— Frances M. 



Harvey • • S^S 



The Philadelphia Meeting of the American Asso- 



QJg^JJQJl ,, • J J 



The Earthquake in Central Italy. By Dr. C. 



^^Yison .. ...• i)j 



Vice-Admiral Sir George Nares, K.C.B., F.R.S. . 565 



Notes . • 567 



Our Astronomical Column :— 



Spectral Line Displacements at the Sun's Limb . . . 571 



Statistics of Spectroscopic Binary Stars 57' 



The Nature and Cause of Cepheid Variation ... 572 



The Prehistoric Society of East Anglia 572 



Annual Meeting of the Paris Academy of Sciences. 



Address by M. Paul Appell 572 



Mathematics in Artillery Science 573 



Some Aspects of Progress in Modern Zoology. 



By Prof. E. B. Wilson 574 



University and Educational Intelligence 5?9 



Societies and Academies 5°° 



Books Received 5°' 



Diary of Societies 5o2 



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Editorial Communications to the Editor. 



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 Telephone Number : Gerrard 8830. 



NO. 2360, VOL. 94] 



