:28 



NATURE 



[November 3, 192 1 



RoTAL Gkoohaphical SociF.Tr (at ^olian Hall), at 8.30. — M. W. 



Hilton-Simpson : The Aureo Massif, Algeria. 



RorAL Institute or British Abchitkcts, at 8.30.— P. AV'atcrhouse : 



Inaugural Address. 



TUESDAY, November 8. 



RoYAt CoLLEGS OF PHYSICIANS OF LONDON, at 5. — Dr. Moon : First 

 FitzPatrick Lecture. 



ZooLoaiCAL Society or London, at 5.30. — E. P. Chajice : The 

 Laying-habits of the Cuckoo (Cuculus canorus) and the Life of 

 the Young Cuckoo. — Dr. W. Rae Sherriffs : J>olution within the 

 Genus. Part I., Dendronephthya (Sponyodes), with Descriptions 

 of a Number of Species. Part II., Description of Species 

 (Alcyonaria) taken by the " Siboga " K.\pedition.— Dr. C. F. 

 Sonntag : The Comparative Anatomy of the Tongues of the Mam- 

 malia, v., Lemuroidea and Tarsioidea. V'l., Summary and 

 Classification of the Tongues of the Primates. — R. I. Pocock : 

 The External Characters and Classification of the Mustelidse. 



BoTAL Photogeaphic Society, at 7.— S. O. Rawling : S^pia Toning 

 with Colloidal Sulphur.— W. L. Wilkinson : Scott Archer's and 

 Hardwick's Wet Collodion Formula Revised. — Miss F. M. Hamer : 

 The Optical and Photographic Properties of Some Isomeric 

 Isocyanines. 



Quekett Microscopical Club, at 7.30.— F. Addey : Pinug sylvestrit. 



Royal Anthropological Institute, at 8.15. — Capt. G. Crowdcn 

 and Prof. G. Elliot Smith : The .Mound Builders of Dunstable. 



WEDNESDAY, Novembeb 9. 



Geological Society or London, at 5.30. — Dr. L. D. Stamp and 

 S. W. Wooldridge : The Igneous and Associated Rocks of Llan- 

 wrtyd (Brecon). — Dr. L. D. Stamp : The Base of the Devonian, 

 with Special Reference to the Welsh Borderland. 



Royal Society or Medicine (Surgerv : Subsection of Proctology), 

 at 5.30. 



Institution of Electrical Engineees (Wireless Sectional Meet- 

 ing), at 6.— Dr. G. W. O. Howe : Address. 



Institution of . Automobile Engineers (at Institution of Mechani- 

 cal Engineers), at 8. — Dr. L. Aitchison : Chromium Steels and 



• Irons. 



Royal Society or Arts, at 8.— D. R. Wilson : The Work of tSe 

 Industrial Fatigue Research Board, and its applications to In- 

 • dustrv. 



THURSDAY, November 10. 



Royal Society, at 4.30. — Probable Papers.— K. J. Wilmott : Experi- 

 mental Hcscarchos on Vegetable Assimilation and Respiration. 

 XIV., Assimilation by Submerged Water Plants in Dilute Solu- 

 tions of Bicarbonates and of Acids, and Improved Bubble Counting 

 Technique. — E. G. Young : The Coagulation of Protein by Sun- 

 light. — E. G. Young : The Optical Rotatory Power of Crystalline 

 Ovalbumin and Serum Albumin. — A. R. Ling and D. R. Nanji : 

 The Longevity of Certain Species of Yeast. — F. Kidd, C. West, 

 and G. E. Briggs : A Quantitative Analysis of the Growth of 

 Heliaiitkus annnus. Part I., The Respiration of the Plant and 

 of its Parts throughout the Life Cycle.— Q. S. Currey : The 

 Colouring Matter of Rod Hoses. 



Royal College or Physicians or London, at 5. — Dr. Moon : Second 

 FitzPatrick Lecture. 



Child-Study Society (at Royal Sanitary Institute), at 6. — F. S. 

 Marvin : The Teaching of History. 



Optical Society (at Imperial College of Science and Technology), 

 at 7.30. — Dr. A. Gleichen : The Path of Rays in Periscopes 

 having an Inverting System comprising Two Separated Lenses. 

 — Dr. J. W. French : The Interocular Distance. — T. Chaundy : 

 Note on the Thin Astigmatic Lens. 



Institute of Met.als (London Section) (at Roval School of Mines), 

 at 8.— Prof. C. H. Desch : Plastic Flow in Metals. 



Institution or Automobile Engineers (at Olympia).— T. Thorny- 

 croft; N. Macmillan : Marine Motors. 



Royal Society of Medicine (Neurology Section), at 8.30. — Sir 

 William Thorburn and Dr. W. Harris : Discussion : The Treat- 

 ment of Persistent Pain due to Lesions of the Central and 

 Peripheral Nervous System. 



FRIDAY, November 11. 

 Oil and Colour Chemists' Association. 

 Physical Society of London (at Imperial College of Science and 



Technology), at 5. — Sir William Bragg: The Structure of Crystals 



of Organic Substances (Presidential Address). 

 Royal Astronomical Society, at 5. 

 Royal Society of Medicine (Clinical Section), at 5.30. 

 Royal Society of Medicine (Ophthalmology Section), at 8. SO. — 



Dr. W. S. Inman : The Relationship of Squint, Left-handedne«s, 



and Stammering.— -Dr. C. F. Harford : The New Psychology 



and its Relation to Problems of Vision. 



PUBLIC LECTURES. 



{A number in brackets indicates the number of a lecture 

 in a series.) 



THURSDAY, November 3. 

 Univeesity College, at 5.— Prof. J. E. G. De Montmorency: 



Feudalism: The Background of the European System (1). 

 Imperial College of Science and Technology, at 5.30.— W. Bateson : 



Recent Advances in Genetics (1). 

 Chadwick Public Lecture (at Royal Institute of British Archi- 

 tects), at 8. — Prof. P. Groom: Dry Rot of Wood and Sanitation. 

 FRID.iY. November 4. 

 Uniteksity College, at 4.30. — Dr. J. C. Drummond : Nutrition (4). 

 At 8.— Prof. G. Dawes Hicks : Our Knowledge of the Real 

 World (1). 



MOyDAY, November 7. 

 Icing's College, at 5.30.— Dr. W. R. Ormandy : Liquid Fuel 

 Engines (2). 



NO. 2714, VOL. 108] 



Imperial College or Science and Technologi, at 5.30. — Dr. J. D. 

 Falconer: The Wonders of Geology (Swiney Lectures) (1). 



TUESDAY, NovEMiEB g. 



King's College, at 5.30.— Prof. H. Wildon Carr : The Modern 

 Scientific Revolution and its Meaning for Philosophy (5) ; The 

 Principle of Relativity.— Dr. W. Brown : Psychology and Psycho- 

 therapy (4). — L. J. Hunt: Cascade Synchronous Motors and 

 Generators (4). 



WEDNESDAY. November 9. 



King's College, at 4.30.— Dr. C. Da Fano : Histologv of the Nervous 



System (5). At 5.15.— Prof. R. R. Gates: Flora of the British 



Empire. 

 School of Orient.al Studies, at 5. — Rev. W. Sutton Page : 



Chaitanya and the Vaishnava Revival in the 16th Century. 

 Imperial College of Science a.vd Technology, at 5.30. — Dr. J. D. 



Falconer: The Wonders of Geology (Swiney Lectures) (2). 



THURSD.XY, November 10. 



Imperial College of Science and Technology, at 3. — W. Bateson : 

 Recent Advances in Genetics (2). 



University College, at 5. — Prof. J. E. G. De .Vfontmorcniy : 

 European Feudalism : Its Variation and Decay (2). 



Birkbeck College, at 5.30.— Prof. F. Soddy : The Bearing of Phy.si- 

 cal Science on Economics (1). 



King's College, at 5.30.— H. W. Fitz-Simons : Bridge Con- 

 struction (3). 



FRIDAY, November 11. 



University College, at 4.30. — Dr. J. C. Drummond: Nutrition (5). 



At 8— Prof. G. Dawes Hicks : Our Knowledge cf the Real 



World (2). 

 Imperiai Coliege of Science and Technology, at 5.30. — Dr. J. D. 



Falconer: The- Wonders of Geology (Swiney Lectures) (3). 



CONTENTS. PAGE 



The Langley Flying: Machine 297 



The Impurity of Pure Substances. By Prof. F. G. 



Donnan, F R.S . 298 



The Birds of Australia. By W. E. C 299 



Climatic Factors in Agriculture. By B. A. Keen 300 



Our Bookshelf 301 



Letters to the Editor:— 



Metallic Coloration of Chrysalids. {Illustrated.)— 



A. Mallock. F.R.S. 302 



Sex-manifestations and Motion in Molluscs. — Dr. 



J. H. Orton . . 303 



The Presence of Perennial Mycelium in Peronospora 



ScWezifewi, Unger.— Paul A. Murphy 304 



The Development of Optical Industries. — ^James 



Weir French ; Mansell P. Swift ; Prof. K. C. 



Browning . . 3^4 



Qualities of Valency.— Dr. S. H C. Briggs . . .306 

 Relation of the Hvdrogen-ion Concentration of the 



Soil to Plant Distribution. — E. A. Fisher ... 306 

 Absorption of X-rays.— W. Ewart Williams and 



B. L. Worsnop . . ..... 306 



The Film-phot ophone.—W. S. Gripenberg; The 



Writer of the Note 307 



Rainfall Records at Fothamsted. — W. D. 



Christmas 3^7 



Edinburgh and the Rise of Oceanography. By 



Prof. W. A. Herdman, C.B.E., F.R.S 308 



Absorption Spectra. By Prof. E. C. C. Baly, 



C.B E., F.R.S. . ... 311 



Artificial Production of Rain. By Dr. Harold 



Jeffreys 3I3 



Obituarv: — 



Prof. Ch. Francois-Franck 3^4 



E. J. Bevan .' 3'4 



Notes . ... . • • • .... 315 

 Our Astronomical Column :— 



The November Meteors . . , • • • • 3^9 



Lipht of the Night Sky • • ■ -319 



Delineations of the Milky Way 3^9 



The Danish Arctic Station. {Illustrated.) By Prof. 



A. C. Seward, F.R.S .... 320 



Psychological Tests for Vocational Guidance . . 321 



Mechanical Engineering Education in Bengal . . -223 



University and Educational Intelligence 323 



Calendar of Scientific Pioneers 3^4 



Societies and Academies 325 



Books Received 3^6 



Diary of Societies 3^7 



