lOO 



NATURE 



[April 3, 1919 



Pp. viii+169. (London: Macmillan and Co., Ltd.) 

 35. 6{i. 



Mathematical Papers for Admission into the Royal 

 Military Academy and the Royal Military College, and 

 Papers in Elementary Engineering for Naval Cadet- 

 ships, July and November, 1918. Edited by R. M. 

 Milne. Pp. 36. (London : Macmillan and Co., Ltd.) 

 15. 3d. 



Prothfese Fonctionnelle des Blesses de Guerre. 

 Troubles Physiologiques et Appareillage. By Dr. 

 Ducroquet Pp. ii + 235. (Paris: Masson et Cie.) 

 5 francs. 



Lectures on the Philosophy of Mathematics. By 

 J. B. Shaw. Pp. vii+206. (Chicago and London: 

 The Open Court Publishing Co.) 6s. net. 



The Human Machine and Industrial Efificiency. By 

 Prof. F. S. Lee. Pp. vii+iig. (London: Longmans 

 and Co.) 55. net. 



Animal Parasites and Human Disease. By Dr. 

 A. E. Chandler. Pp. xiii+570. (New York : J. 

 Wiley and Sons, Inc. ; London : Chapman and Hall, 

 Ltd.) 2 IS. net. 

 J Notes. Problems, and Laboratory Exercises in 

 Mechanics, Sound, Light, Thermo-Mechanics, and 

 Hydraulics. By Prof. H. Dunwoody. Pp. v + 369. 

 (New York : J. Wiley and Sons, Inc. ; London : 

 Chapman and Hall. Ltd.) 13s. 6d. net. 



The Development of Forest Law in America. By 

 J. P. Kinney. Pp. xviii+254+xxi. (New York : J. 

 Wiley and Sons, Inc. ; London : Chapman and Hall, 

 Ltd.) IIS. 6d. net. 



The Essentials of American Timber Law. By J. P. 

 Kinney. Pp. xix + 279 + x. (New York : J. Wiley and 

 Sons, Inc. ; London : Chapman and Hall, Ltd.) 

 13s. 6i, net. 



DIARY OF SOCIETIES. 



THURSDAY. April 3. 

 Royal Institution, at 3. — Prof. A. Findlay : Colloidal Matter and its 



Properties. 

 RovAL Society, at 4.30. — Dr. T. R. Merton and Prof. J. W. Nicholson : 



Note on tlie Intensity Decrement in the Balmer Series. — Prof. E. W. 



Brown : The Determination of the Secular Accelerations of the Moon's 



Longitude from Modern Observations.— Dr. W. Rosenhain and S. L. 



Arrhbutt : The Inter-crystalline Fracture of Metals under Prolonged 



Application of Stress. — Dr. J. R. Airey : Zonal Harmonics of High Order 



in Terms of Bessel Functions. 

 LiNNEAN Society, at 5. — W. R. Brierlev : An Albino Mutant of Botrytis 



cincrea.—X)r. T- D. F. Gilchrist : 'Ihe Post-Puerulus Stage of Jasus 



/alandi'i'. — Montagu Drummond : The Ecology of a Small Area in 



Palestine. 

 Child-Studv Society, at 6. — Dr. E. Pritchard : Home 7>. Institutional 



Training of Youna: Children. 

 Institution of Electrical Engineers, at 6. — Lt.-Col. A. G. T. 



Cusins : The Development of Army Wireless during the War. 

 Chemical Society, at 8. 



SATURDAY, April 5. 

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



Application to Atomic Structure. 



MONDAY, April 7. 

 Royal Society of Arts, 314.30. — Prof. H. E. Armstrong: Problems of 



Food and their Connection with onr Economic Policy. 

 Society of Engineers, at 5. — Prof J. Young : Modern Explosives. 

 Royal Geographical Society, at 8. — Miss CzapUcka : Poland. 

 Aristotelian Society, at 8. — A. F. Shand : Value in Relation to 



Emotion. 

 Society of Chemical Industry, at 8. — E. A. Alliott : Drying by Heat 



in Conjunction with Mechanical Agitation and Spreading. — Dr. P. E. 



Spielmann and F. Butler Jones ; The Estimation of Carbon Disulphide. 



A Critical Examination of the various Methods usually Employed. — Dr. 



P. E. Spielmann and Dr. S. P. Schotz : The Estimation of Thiophene.— 



Dr. P. E. Spie'mann and H. Wood : The Estimation of " Free Carbon " 



in Tar and Pitch. 



TUESDAY, April 8. 

 Royal Institution, at 3. — Pro*'. A. Keith: British Ethnology — The 



People of Scotland. 

 Royal Anthropological Institute, at 5.— Lieut. E. W. P. Chinnery : 



Reactions of Certain New Guinea Primitive People to Government 



Control. 

 Zoological Society, at 5.30.— Dr. F. E. Beddard : Three Foetal Sperm- 



Whales. — L. T. Hogben : The Progressive Reduction of the lugal in the 



Mammalia. — G. A. Boulen,ger : Description of Two New Lizards and a 



New Frog from the Andy's of Colombia. 

 Institution of Civii Engineers, at 5.30.— G. Hughes: The Electrical 



and Mechanical Equipment of the All-metal Cars of the Manchester- Bury 



Section, Lancashire and Yorkshire Railway.— F. E. Gobey : All-metal 



Passengar Cars for British Railways. 

 Illuminating Engineering Society, at 8.— J. B. Fagan : Light and 



Colour in Relation to Stage Production. 



IVEDNESDAV, April 9. 



Institution of Naval Architects, at n a.m. — The Rt. Hon. the Earl 

 of Durham, K.G. : Presidential Address. — Sir Philip Watts : Ships of the 

 British Navy on August 4, 1914, and Some Matters of Interest in Contiec- 

 tion with their Production. -^Sir E. H. Tennyson d'Eyncourt : Naval 

 Construction during the War. — S. V. Goodall : The Naval Con.struction 

 Corps of the United States Navy. 



Royal Society of Arts, at 4.30. — Prof. L. E. Hill : Housing and Infant 

 Mortality. 



Geological Society, at 5.30. — W, Whilaker : The Section at Worms 

 Heath (Surrey), with Remarks on Tertiary Pebble-beds and on Clay-with- 

 Flints. — G. MacDonald Davies : Petrological Examination of the Beds at 

 Worms Heath. 



Royal Aeronautical Society, at 8.— Col. H. G. Lyons: The Supply 

 of Meteorological Information for Aeronautical Purposes. 

 THURSDAY. April 10. 



Institution of Naval ''Architects, at 11 a.m. — A. E. Seatou : The 

 Work of the British Marine Engineering Design and Construction Com- 

 mittee.— Signor S. Orlando : Italian Two Floodable Compartment Cargo 

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

 Graham : Some Recent Developments towards a Simplification of 

 Merchant Ship Construction. — At 3. — C. I. K. Campbell : Development 

 of Airship Construction.- — \V. L. Scott : Concrete Shipbuilding in the 

 United States of America. — At 7.30. — The Hon. Sir C. A. Parsons 

 and Stanley S. Cook : Investigation into the Causes of Corrosion and 

 Erosion of Propellers.— J. H. Gil-son : The Michell Thrust Block. 



Royal Institution, at 3.— Prof. A. Findlay : Colloidal Maiter and its 

 Properties. 



In.stitution of Mining and Metallurgy, at 5. — Major H. Standish 

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



Royal Historical Sooetv, at 5. — K. A. Gregory : Science in the History 

 of Civilisation. 



Institution of Electrical Engineers, at 6. — R. J. Kaula: 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 Architfjits, at 11 a.m. — W. H. Gard: Some 

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

 Further Experiments on the Stre-s Determination 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, at 5 



Royal Institution, 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. 



CONTENTS. PAGE 



Preservation of Timber in India. By Prof. Percy 



Groom . . . 81 



Prof. Righi's Researches. By N. R. C 82 



Our Bookshelf . 83 



Letters to the Editor :— 



The Colour of the Scales of Iridescent Insects in 



Transmitted Light.— The Hon. H. Onslow . . 84 



Matter and Radiation.— Horace H. Poole .... 84 



National Fisheries. — Capt. G. C. L. Howell; The 



Writer of the Note ... .... 84 



Coal in Thrace.— Canon Edmund M'Clure ... 85 



The Machinery of Government 85 



Sir E. C. Stirling, C.M.G., F.R.S. By C. H. K. . . 87 



Notes . . . - 88 



Our Astronomical Column : — 



Comet 19146- (Neujmin) 92 



Comet 1915a (Mellish) 92 



The Cepheid Variables 92 



War Work of British Chemists .'...., 92 



Energy Transmission 93 



The Problem of Radio-active Lead. II. By Prof. 



Theodore W. Richards 93 



University and Educational Intelligence 96 



Societies and Academies 97 



Books Received • 99 



Diary of Societies 100 



(Index.) 



Editorial and Publishing Offices: 



MACMILLAN AND CO., Ltd., 



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



Advertisements and business letters to be addressed to the 

 Publishers. 



Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



NO. 2579, VOL. 103] 



