692 



NATURE 



[February 18, 191 5 



Numeriques : Donnees Numeriques de Biologie, Bio- 

 chimie, Chimie Physique Biologique, Physiologie, 

 Microbiologie, Pharmacodynaniie. By E. F. Terroine. 

 Pp. xi + 20. Cristallographie et de Mineralogie. By L. J. 

 Spencer. Pp. viii + 425-446. Radioactivite Atomistique. 

 Electronique et lonisation. By J. Saphores and F. 

 Bourion. Pp. viii + 295-307. Spectroscopic. By Dr. 

 L. Briininghaus. Pp. viii+ 165-238. L'Electricit^, 

 JNIagnetisme et Electrochimie. By Profs. P. Dutoit 

 and W. C. McC. Lewis, and Dr. A. Mahlke. Pp. 

 ix + 258-417. Art de I'lng^nieur et Metallurgie. By 

 S. L. Archbutt and others. Pp. viii + 5 10-600. (Paris : 

 Gauthier-Villars et Cie.) 



The Hydrogenation of Oils, Catalyzers, and Cata- 

 lysis, and the Generation of Hydrogen. By C. Ellis. 

 Pp. X + 340. (London : Constable and Co., Ltd.) 165. 

 net. 



Catalogue of Scientific Papers. Fourth Series 

 (1884-1900). Compiled by the Royal Society of Lon- 

 don. Vol. xiv., C — Fittig. Pp. ' 1024. (Cambridge 

 University Press.) 2I. los. net. 



The Extra Pharmacopoeia of Martindale and West- 

 cott. Revised by Dr. W. H. Martindale and ^^^ Wynn 

 WTestcott. Sixteenth edition. In 2 Vols. Vol, 'i., 

 pp. xl+1113. Vol. ii., pp. viii + 469. (London : H. K. 

 Lewis.) Vol. i., 145. net; vol. ii., 75. net. 



Mathematical Papers for Admission to the Roval 

 Military Academy and the Royal Military College for 

 the Years 1905-14. Edited by R. M. Milne. (Lon- 

 don : Macmillan and Co., Ltd.) 65. 



The Next Generation. By F. G. Jewett. Pp. xi4- 

 235. (Boston, New York, Chicago, London : Ginn 

 and Co.) -xs. 6d. 



DIARY OF SOCIETIES. 



THURSDAY, February 18. 

 Roval Society, at 4.30.— Gaseous Combustion at High Pressures: Prof. 



W. A. Bone and Others.— The Orbits of a Charged Particle Round an 



Electric and Magnetic Nucleus ; Prof. W. M. Hicks.— The Lunar Diurnal 



Magnetic Variation and its Change with Lunar Distance : S. Chapman. 



—Some Temperature Refraction Coefficients of Optical Glass : Lt.-Col. 



J. W. Gifford. 

 Royal Institution, at 3.— Struggle of Species : Dr. P.Chalmers Mitchell. 

 LiNNEAN Society, at 5.— The Action of Light upon Chlorophyll: H. 



Wager. 

 Institution of Petroleum Technologists, at 8.— The "Cracking" 



of Oils, with a View to Obtaining Motor Spirit and other Products : 



W. A. Hall. 

 Institution of Mining and Metallurgy, at 8.— Notes on some Gold 



Occurrences in Ashanti : J. Morrow Campbell.— Some Features in the 



Mining Problems of the East Witwatersrand Area : W. G. Holford.— 



Prospecting Tin Land in Malaya : VV. B. Middleton. 



FRIDAY, February iq. 

 Royal Institution, at 9.— The Visit of the British Association to 



Australia: Prof. H. E. Armstrong. 

 Institution of Mechanical Engineers, at 8.— Annual General 

 Meeting.— Convertible Combustyjn Engines: A. E. L. Chorlton.i 

 SATURDAY, February 70. 

 Royal Institution, at 3.— Recent Researches on Atoms and Ions: Sir 

 J. J. Thomson. 



MONDAY, February 22. 

 Royal Society of Arts, at 8.— Motor Fuels: Prof. Vivian B. Lewes. 

 Institute of Actuaries, at 5.— Practical Points in Connection with the 



Formation and Valuation of Pension Funds, with a note on Group 



Assurances: J. Burn and F. P. Symmons. 



TUESDA Y, February 23. 



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

 Sherrington. 



Zoological Society, at 5.30.— <i) Abnormal Gills in the Starfish, Porania 

 pulvilhis O.^.M. (2) The Ciliation of Asterids, and the Question 

 of Ciliary Nutrition in Certain Species: Dr. J. F. Gemmill— The 

 Methods of Keeding and the Mouth-parts of the Larva of the Glow- 

 worm (Lain^yris noctiluca): Miss Kathleen Haddon. — Descriptions of 

 New Fossorial Wasps from Australia : R. E. Turner.— Notes on a small 

 Collection of Heterocera made by Mr. W. Feather in British East 

 Africa, 1911-12: Lt.-Col. J. M. Fawcett. 



Royal Anthropological Institute, Joint Meetings with The Pre- 

 historic Society of East Anglia, at 2.30, at the Royal College of 

 Surgeons.— Papers by members of the Prehistoric Society; at 8.15.— 

 Ouse Valley Cultures : Charles Dawson. 



Institution of Civil Engineers, at 8.— The Electrolytic Action of 



Return Currents in Electric Tramways on Gas and Water-Mains, and the 



Best Means of Providing against Electrical Disturbances : H. E. Yerbury. 



WEDNESDAY, February 24. 



Roval Geographical Society, at 8.30.— Africa after the War : Sir 

 Harry H. Johnston. 



Royal Society of Arts, at 8.— The Economics of the War : Prof. W. J. 

 Ashley. 



Geological Society, at 8. — The Ashgillian Succession in the Tract to 

 the West of Coniston Lake : Dr. J. E. Marr. — The Radioactive Methods 

 of Determining Geologic Time : H . S. Shelton. 



THURSDAY, February 25. 



Royal Society, at 4.30. — Probable Papers : The Effect of the Depth of 

 Pulmonary Ventilation on the Oxygen in the Venous Blood of Man: 

 J. F. Twort and Prof. L. Hill.— The Function of Chlorophyll: Dr. A. J. 

 Ewart. — Contributions to the Study of the Bionomics and Reproductive 

 Processes of the Foraminifera : E. Heron-Allen. — The Influence of the 

 Hydrogen Concentration upon the Optimum Temperature of a Ferment : 

 A. Compton. 



Royal Institution, at 3. — Struggle of Nations : Dr. P. Chalmers Mitchell. 



Child Study Society, at 6. — Discussion : The Care and Development of 

 the Child— from Ante-Natal Period to Five Years of Age. Ante- Natal 

 Period : Dr. G. Eric Pritchard ; Infancy : Miss J. Halford ; One to Five 

 Years : Dr. D. Forsyth. 



Institution of Electrical Engineers, at 8.— Electricity applied to- 

 Mining : C. P. Sparks. 



PR /DAY, February 26. 



Royal Institution, at 9. — Solar Eclipse of 1914 : The Rev. A. L. Cortie. 

 SATURDAY, February 27, 



Royal Institution, at 3. — Recent Researches on Atoms and Ions : Sir 

 J. J. Thomson. 



CONTENTS. PAGE 



Vital Statistics 665 



Technical Methods of Chemical Analysis. By T. 665 

 Two Books on the Earth, By Prof. Qrenville A. J. 



Cole 666 



Mathematical Text-Books 667 



Our Bookshelf 668 



Letters to the Editor : — 



Fine Chemicals for Research Purposes — Prof. H. B. 

 Baker, F.R.S. ; Prof, J. F. Thorpe, F.R.S, ; 



M. A. Whiteley 670 



A Penalty on Research.— Prof. Sydney J. Hickson, 



F.R.S 670 



The Prices of Chemicals.— J. J. ; A Firm of Dealers 



in Chemicals 670 



British Supplies of Laboratory Ware.— C. A. Mercer 670 

 Problems of Radiation. (fVM Diagram.)— ^roi. 



C. G. Barkla, F.R.S 671 



The Green Flash.— Prof. Alfred W. Porter, F. R. S. 672 

 Trenching Ground and Spraying Potatoes. — Spencer 



Pickering, F.R.S 672 



Early Representations of the Giraffe. {Illustrated.)— 



Dr. C. R. Eastman 672 



The Economic Status of the Blackcap.— Alfred O. 



Walker ; Walter E. CoUinge 673 



The Rusting of Iron.— E. J. Sumner 673 



Star Clusters. {Illustrated). By Prof. H. C. Plummer 674 

 On Colour Sensitised Plates.— I. {Illustrated.) By 



Chapman Jones 676 



Whaling in Southern Seas. {Illustrated.) 678 



Chemistry and Industry. By Prof. Jocelyn Thorpe, 

 F.R.S 



Notes 



Our Astronomical Column :— 



A New Cojnet, 1915a (Mellish) 



The Zodiacal Light 



Astronomy and Mathematics '• 



The Madrid Observatory's Annual for 1915 



What is Gravitation ? 



Eugenics and War 



Standardising Apparatus and Methods 



Gaseous Explosions. By Dr. Dugald Clerk, F.R.S. 



Climate and Trees 



University and Educational Intelligence 



Societies and Academies 



Books Received 



Diary of Societies 



679 

 680 



685 



685 



685 



685] 



685] 



686J 



6871 



687] 



688] 



689 



690^ 



691 



692 



Editorial and Publishing Offices: 



MACMILLAN & CO., Ltd., 



ST. MARTIN'S STREET, LONDON, W.C. 



Advertisements and business letters to be addressed to tht 



Publishers. 



Editorial Communications to the Editor. 



NO. 2364, VOL. 94] 



Telephone Number : Gerrard 8830. 

 Telegraphic Address: Phusis, London. 



