I20 



NATURE 



[April io, 19 19 



BOOKS RECEIVED. 



\ an Nostrand's Chemical Annual. Fourth issue. 

 19 18. Edited by Prof. J. C Olsen, assisted by Lieut. 

 M. P. Matthias. Pp. xviii+778. (London : Con- 

 stable and Co., Ltd.) 15s. net. 



The Century of Hope. By F, S. Marvin. Pp. vi+ 

 352. (Oxford : At the Clarendon Press.) 65. net. 



Report on an Inquiry into the Silk Industry in 

 India. Vol. i. : The Silk Industry. By H. Maxwell- 

 Lefroy. Pp. ii+211. Vol, ii. : Present Condition of 

 the Silk Trade of India. By E. C. Ansorge. Pp. 

 vi + 115. Vol. iii. : Appendices to Vol, i. By H. 

 Maxvvell-Lefi oy. Pp. 237. (Calcutta : Superintendent 

 Government Printing, India.) Vol. i., 3s.; vol. ii., 

 25. ; vol. iii., 45. 2d. 



The Journal of a Disappointed Man. By W. N. P. 

 Barbellion. With an introduction by H. G. Wells. 

 Pp. X + 312. (London: Chatto and Windus.) 6s. 

 net. 



Catalogue of Lewis's Medical and Scientific Cir- 

 culating Library. New edition, revised to the end 

 of 1917. Pp. vi + 492. (London: H. K. Lewis and 

 Co., Ltd.) J2S. 6d. net. 



The War Work of the Y.M.C.A. in Egypt. By 

 Sir J. W. Barrett. Pp. xx-l-212. (London : H, K. 

 Lewis and Co., Ltd.) los. 6d. net. 



Strife of Systems and Productive Duality : An 

 Essay in Philosophy. By Prof. W. H. Sheldon. 

 Pp. x+534. (Cambridge, Mass. : Harvard Univer- 

 sity Press; London: Humphrey Milford.) 155. net. 

 V Concealing-coloration in the Animal Kingdom. By 

 G. H. Thayer. With an introductory essay by A. H. 

 Thayer. New edition. Pp. xix + 260+xvi plates. 

 (New York: The Macmillan Co.; London: Mac- 

 millan and Co., Ltd.) 255. net. 



Criminology. By Dr. M. Parmelee. Pp. xiii4-522. 

 (New York : The Macmillan Co. ; London : Mac- 

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



Soils and Fertilizers. By Prof. T. L. Lyon. 

 Pp. xx + 255. (New York: The Macmillan Co.; 

 . London : Macmillan and Co., Ltd.) 65. 6d. net. 



The Mastery of Nervousness, Based upon Self- 

 Re-education. By Dr. R. S. Carroll. Third revised 

 edition. Pp. 748. (New York: The Macmillan Co.; 

 London : Macmillan and Co., Ltd.) los. 6d. net. 



The Living Cycads. By Prof. C. J. Chamberlain. 

 Pp. xiv-t-172. (Chicago, 111.: The University of 

 Chicago Press.) i.qo dollars net. 



Le Rocce : Concetti e Nozioni di Petrografia. By 

 Prof. E. Artini. Pp. xx+636 + plates xxxii. (Milano : 

 U. Hoepli.) i8.=;o"lire. 



Self and Neighbour : An Ethical Studv. By E. W. 

 Hirst. Pp. xix + 291. (London: Macmillan and Co., 

 Ltd.) I05. net. 

 ^ Aids in Practical Geology. By Prof. G. A. J. Cole. 

 Seventh edition, revised. Pp. xvi+431. (London : 

 C. GriflRn and Co., Ltd.) los. 6d. net. 



The Elements of Astronomy for Surveyors. By 

 Prof. R. W. Chapman. Pp. x + 247. (London: 

 C. Griflfin and Co., Ltd.) 5s. net. 



Les Principes de 1 'Analyse Math^matique : Expos^ 

 Historiaue et Critique. By Prof. P. Boutroux. 

 Tome ii. Pp. .i:;i2. (Paris: A. Hermann et Fils.) 

 20 francs. 



~ DIARY OF SOCIETIES. 



THURSDAY. April io, 

 Institution ok Naval Architects, at ii a.m. — A. E. Seatoti : The 

 Work of the British Marine Engin»'eri"g Desisrn and Constru'~tion Com- 

 mittee. — S'Sfnor '^. Oi-km^o : Italian Two Floodab'e ComDirtment Careo 

 Steamers Built during the War. — Sir E. H, Tennyson d'Evncourt and T. 

 Graham : Some Recent Developments towards a Simplifiration of 

 Merchant Ship Con^trurtion. — At 5. — C. I. R. Camrbell ; Oevelopment 

 of Airship Constniction. — W. L. Scott: Cd"crete Shipbuilding in the 

 United States of America.— A' y.-^o. — The Hon. Sir C. A. Par.sons 

 and Stanley S. Cook : Invc.stieation into the Causes of Corrosion and 

 Erosion of Propellers.— J. H. Gilson : The Michell Thrust Block. 



RovAL Institution, at 3.— Prof. A. Findlay : Colloidal Matter and iu 

 Properties. 



Institution of Mining and Metallurgy, at 5.— Major H. StandUh 

 Ball : The Work of the Miner on the Western Front. 



RovAi. Hlsioricai. Society, at 5.— R. A. Gregory : Science in the History 

 of Civilisation. 



Institution of Electrical Enginebrs, at 6.— R. J. tCaula: Notes on 

 Surface Condensing Plants, with Special Reference to the Requirements 

 of Large Power Stations. 



Optical Society, at 7.30.— J. W. French : The Unaided Eye.— T. Smith : 

 The Spacing of Glass-working Tools. 



FRIDAY, April ii. 



Institution of Naval Architpcts, at ii a.m.— W. H. Gard : Some 

 Experiences with Electric WelJing in Warships. — Dr. J. Montgomerie : 

 Further Experiments on the Stres Deierminatiim in Flat .Steel Plates. — 

 A. T. Wall : The Tonnage of Modern Steamships.— At 3.— J. L. Kent: 

 Model Experiments on the Effect of Beam on the Resistance of Mercantile 

 Ship Forms.— J. Semple : Some Experiments on Full Cargo Ship Models. 



Royal Astronomical Society, ai 5 — J. H. Jeans: The Origin of 

 Binary Sy^t^xns.— Probable Papers : t)r. A. A. Rambaut : A Short Table 

 for Direcily Converting Estimates of Brightness into Stellar Magnitudes 

 on Pogsons Scale.— Rev. T. E. R. Phillips: Note. on a Remarkable 

 Change in the South Tropical .Region of Jupiter. 



Royal In.stitution, at 5.30.— Sir J. J. Thomson: Piezo-Electricity and 

 its Applications. 



SATURDAY. April 12. 



Royal Institution, at 3. — Sir J. J. Thomson : Spectrum Analysis and its 

 Application to Atomic Structure. 



MONDA Y, April 14. 

 Royal Geographical Society, at 5.— Dr. J. Ball and H. K. Shaw : The 



Astrolabe .a Prisme. 

 Institution of Electrical Engineers, at 7.30.— Dr. R. D. Gifford : 



Opener of a Discussion on Electrical Instruments. 



TUESDAY, April 15. 



Royal Statistical Society, at 5.15.-1)1. A. L. Bowley : The Measure- 

 ment of Changes in the Cost of Living. 



Institution of Petroleum Technologists, at 5.30.— C. Greenway : 

 Valedictory .\ddre«s.— Sir F. W. Black : Presidential Address, Some War 

 Problems of Petroleum Supply. 



WEDNESDAY. April 16. 

 Royal Meteorological Society, at 5. — A. A. Barnes : Rainfall in 



England ; the True Long-average as Deduced from Symmetry.— C. E. P. 



Brooks : The Secuhr V..rialion of Rainfall. 

 Royal Aeronautical Society, at 8.— Dr. F. C. Lea : Aluminium Alloys 



for Aeroplane Engines. 



CONTENTS. PAGE 



Modern Optical Instruments. By A. E. C loi 



The Usefulness of Psychology loi 



A Melanesian Dictionary. By Sidney H. Ray . . 102 



Our Bookshelf 103 



Letters to the Editor:— 



Marine Research at St. Andrews. — Prof. A. Meek . 104 



The Machinery of Government. — A. J. Brander . . 104 



Visualisation of Features. — R. F. Powell ..... 104 



The " Atom."— A. A 104 



The Dominion of Canada's 72-in. Telescope. {Illus- 

 trated.) By Dr. J. S. Plaskett 105 



The Use of Animals in Medical Research 108 



Sir William Crookes, O.M., F.R.S. By W. A. T. . 109 



Notes ... Ill 



Our Astronomical Column : — 



The April Meteoric Display . 1 14 



Unification of the Astronomical and Civil Day ... 115 



The Evolution of Binary Systems 115 



Aerial Photography . 115 



New Knowledge of a Puzzling Group of Gymno- 



sperms. By Prof. A. C. beward, F.R.S. . . . 115 

 Education and Science in the Civil Service Esti- 

 mates .... 116 



University and Educational Intelligence 117 



Societies and Academies 118 



Books Received 120 



Diary of Societies .... 120 



Editorial and Publishing Offices: 

 MACMILLAN AND CO., Ltd., 

 MARTIN'S STREET, LONDON, W.C.2. 



ST. 



Advertisements and business letters to be addressed to the 

 Publishers. 



Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



NO. 2580, VOL. 103] 



