76 



NATURE 



[March i6, 1916 



X4-2I3. (Chicago: University of Chicago Press; 

 Cambridge : University Press.) 5*-. net. 



Notes on the Fenland. By Prof. T. McKenny 

 Hughes, with a description of the Shippea Man. By 

 Prof. A. Macalister. Pp. 35. (Cambridge : At the Uni- 

 versity Press.) 6d. net. 



The Gravels of East Anglia. By. Prof. T. McKenny 

 Hughes. Pp. 58. (Cambridge : At the University 

 Press.) 15. net. 



Theosophy and Modern Thought. By C. Jinaraja- 

 dasa. Pp. 171. Adyar, Madras : Theosophical Pub- 

 lishing House.) 2s. 



Department of Mines and Geology, Mysore State. 

 Records, vol. xiv., 1915. Part i, Annual Report for the 

 Year 1914. Pp. 59. (Bangalore : Government Press.) 

 I rupee. 



Records of the Surx'ey of India. Vol. vi. Comple- 

 tion of the Link connecting the Triangulations of India 

 and Russia, 1913. Prepared under the direction of 

 Col. Sir S. G. Burrard. Pp. 115. (Dehra Dun: 

 Trigonometrical Survey.) 6s. 



Nutritional Physiology. By P. G. Stiles. Second 

 edition. Pp. 288.' (Phi'l^elphia and London : W. B. 

 Saunders Co.) 6s. net. 



An Introduction to Neurology. By Prof. C. J. 

 Herrick. Pp. 355. (Philadelphia and London : W. B. 

 Saunders Co.) 7s. 6d. net. 



E.\amples in Alternating-Currents for Students and 

 Engineers. By Prof. F. E. Austin. Vol. i. Second 

 edition. Pp. 223. (Hanover, N.H. : F. E. Austin.) 

 2.40 dollars. 



Surgery in War. By Major A. J. Hull. Pp. xv + 

 390. (London : J. and A. Churchill.) 105. 6d. net. 



The British Freshwater Rhizopoda and Heliozoa. 

 By J. Cash and G. H. Wailes. Vol. iii., Rhizopoda. 

 Part iii. By G. H. Wailes. Pp. xxiv + 1 56 + plates 

 xxxiii-lvii. (London: Ray Society; Dulau and Co., 

 Ltd.) \2S. 6d. net. 



The Principles of Plant-Teratology. By W. C. 

 Worsdell. Vol. i., pp. xxiv + 269 + xxv plates. (Lon- 

 don : Raj- Society; Dulau and Co., Ltd.) 25s. net. 



The Physical Properties of Colloidal Solutions. By 

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Hydraulic Flow Reviewed. By A. A. Barnes. Pp. 

 xi+158. (London : E. and F. N. Spon, Ltd.) 125. 6rf. 

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DIARY OF SOCIETIES. 



THURSDAY, March i6. 



Royal Society, at 4.30. —Preliminary Report on the Purbeck Characeae : 

 C. Reid and J. Groves.— Notes on the Genus Toxoplasma, with a Descrip- 

 tion of Three New Species : prof. H. G. Plimmer. — The Convolutional 

 Pattern of the Brains of Identical Twins : a Study on Hereditary Resem- 

 blance in the Furrows of the Cerebral Hemispheres : F. Sano. 



RcvAL Institution, at 3. — Organic Products used as Propulsive and 

 Explosive Agents Prof. H. E. Armstrong. 



Institution of Elfxtrical Engineers, at 8. — The Possibilities in the 

 Design of Continuous-current Traction Motors : N. W. Storer.— The Use 

 of Direct Current (or Terminal and Trunk Line Electrification: N. W. 

 Storer. 



I.INNEAN Society, at 5. — Resemblance between African Butterflies of the 

 Genus Charaxes : a New Form of Mimicry : Prof. E. P. Poulton. — Notes 

 on Plants roUccted in Sikkim, including the Kalimpong District : C. C. 

 Lacaita. — ExhiSition of Species of Ribes and their Garden Derivation: 

 E. BanyarJ. — Early Botanical Exploration of North America : B. Daydon 

 Jackson. 



Child Study Society, at 6. — The Unconscious Mental Life of the Child : 

 Dr. E. Jones. 



FRIDAY, March 17. 



Royal Institution, at 5.30. — The Search for New Coal Fields in England : 

 Dr. A. Strahan. 



Institution of Mechanical Engineers, at 6. — The Composition of the 

 Exhaust from Liquid-fuel Engines : R. W. Fenning. 



SATURDAY, March 18. 

 Royal Institution, at 3. — Radiation from Atoms and Electrons: Sir 

 J. J. Thomson. 



MONDAY, March 20. 

 Royal Geocraphical Society, at 8.30. — The Military Geography of the 



Troad : Dr. W. Leaf. 

 Aristotelian Society, at 8. — Symposium "Recognition and Memory": 

 Miss Beatrice Edgell, F. E. Bartlett, Dr. G. E. Moore, and Dr. H. W. 

 Carrr 



Victoria Institute, at 4.30.— Inscriptions and Drawings from Roman 

 Catacombs : Rev. H. E. Fox. 



TUESDAY, March 21. 



RovAL Institution, at 3.— Sea Power as a Factor in the Evolution of 

 Modern Races : Prof. A. Keith. 



Zoological Society, at 5.30.— Results of Mendelian Cross in Fowls:. 

 J. T. Cunningham. — Structure of the Alisphenoid Canal in some Civet* 

 and Hyaenas : K. I. Pocock. — Observations on the Cytology of Flagellates 

 and Amoebx obtained (rom Old Stored Soil: Dr. T. Goodey.— Notes on 

 the .Sitatunga or Mar.-h-Antclope of the .Se^se Islands : Major k. 

 Meincrtzhagen. 



Ili.u.mi.nating Engineering Society, at 5.— Discussion : Some Aspects 

 of the Design and Use of Glassware in Relation to Natural and Artificial 

 Illumination. . • 



Institution ok Civil. Enginf.ers, at 5.30. — The Rangoon River- 

 Training Works : Sir G. C. Buchanan, CLE. 



Institution of Petroleum Technologists, at 8. — Valedictory Address 

 by the President, Sir Bovenon Redwood.— The Natural Gas Industry,, 

 its Progress and Importance: Dr. J. A. Leo Henderson. 



Mineralogicai. Societv, at 5.30. — An Improvement in the Methods of 

 Dcteruii iiig the Relractive Indices oj Minerals under the Microscope: 

 Dr. J. W. Evans. — A Butterfly-twin of G>psum : L. J. Spencer. 



Royal Statistical Society, at 5.15. — War Finance: Sir George Paish. 



IVEDNESDAY, March 22. 

 Geological Society, at 5.30. 



THURSDAY, March 23. 

 Royal Institution, at 3.— Organic Products used as Propulsive and 

 Explosive Agents : Prof. H. E. Armstrong. 



FRIDAY, March 24. 

 Royal Institution, at 5.30. — The Mechani^m of Chemical Change ii> 

 Living Organisms : Prof W. M. Bayliss. 



SATURDAY, March 25. 

 Royal Institution, at 3. — Radiations from Atoms and Electrons: .Sir 

 J.J. Thomson. 



CONTENTS. PAGE 



London Hydrology 53 



Organic Chemistry. ByJ. B. C 54. 



The Elementary Principles of Crop Production . . 55 



Our Bookshelf 55 



Letters to the Editof:— 



The Structure of the Line of Wave-Length 4686 A. U. 



(/////j-/;-rt/^a'.)— E. J. Evans ; C. Croxson .... 56 



Ground Rainbows. — Capt, Charles J. P. Cave ... 57 

 Memorials of Men of Science in Westminster 



Abbey. {INitstrated. ) 5& 



The Reform of the Man of Science 59 



Sulphuiic Acid in America 60 



Notes 61 



Our Astronomical Column :— 



Comet 1916a (Neujmin) 67 



Comet 1915^ (Taylor) . 67 



Variable Stars in the Vicinity of R Corons Australis 67 



A Possible Deflection of Light by a Moving Medium 67 



A Tungsten Target for X-Ray Tubes, {lllusirated.) 67 



Osmotic Pressure or Osmotic Suction ? By T. M. L. 68 



Post-Graduate Scholarships and Fellowships ... 69 



Institution of Mechanical Engineers 69 



The Origin of English Measures of Length. By 



Sir Charles M. Watson, K.C.M.G., C.B 69 



University and Educational Intelligence 72 



Societies and Academies 73 



Books Received 75 ^ 



Diary of Societies 7^ ] 



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Editorial Communications to the Editor. 

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NO. 2420, VOL. 97J 



