652 



NATURE 



[January 13, 192 1 



Rorii, SociETi or Medicine (Clinical Section), at 6.30 



JUNIOB Institution or £noineebs (at Caxton Hall), at 8.— B. E. D. 

 Kilburn : The Tides : Their Cause, Effect, and Use (Chairman's 

 Address). 



RoiAL SOCIETI or Medicine (Ophthalmologry Section), at 8.30.— 

 Dr. R. Piokard : Variations in the Siie of the Physiological Cup, 

 and their Relation to Olaucoma.— B. T. Lang : Sootometry. 

 HOBDAY, Januabi 17. 



ViCTOEiA Institute (at Central Buildings, Westminster), at 4.30.— 

 Bishop E. O. Ingham : Some Rctteotions on How Empire Came 

 to Us, and Can Alone be Conserved. 



Institute or Actuaeies, at 5.— O. King: A Short Method of Con- 

 structing Select Mortality Tables. 



RoiAL College oi Suhgeons or England, at 5.— Prof. A. Keith : 

 The Principles of Craniology applied to Clinical and Racial 

 Problems. 



RoiAL GEOGEAfHiCAL SociETT (at Lowthcr Lodge), at 5.— Lt.Col. 

 E. P. W. Leea: International Aeronautical Maps. 



Institution or Electeical Engineers (Informal Meeting) (at Char- 

 tered Institute of Patent Agents, Staple Inn Buildings), at 7.— 

 P. Pitt and Others : Discussion on The Mental Equipment of an 

 Engineer. 



Aristotelian Society (at the University of London Club, 21 Gower 

 Street), at 8.— Prof. G. Dawes Hicks and Others: Discussion 

 on Space, Time, and Deity. 



RoTAL Institute or Beiiish Aechitects, at 8.— H. C. Bradshaw : 

 The Restoration of Praeneste. 



Chemical Industet Club (at 2 Whitehall Court), at 8.— H. B. Colcy : 

 Some Chemical and Other Notes on His Tour in Borneo. 



RoTAL Society of Aets, at 8.— A. E. L. Chorlton : Aero Engines 

 (Howard Lectures). 



TUESDAY, JANUAEY 18. 

 Royal Institution or Great Beitain, at 3. — Sir Gerald P. Lenox- 



Conyngham : The Progress of Geodesy in India. 

 Royal Statistical Society (at Surveyors' Institution), at 5.15. 



A. W. Flux : The Measurement of Price Changes. 

 MiNEEALOoicAL SOCIETY (at Geological Society), at 5.30.— A. F. Halli- 



mond : The Olivine Group. — W. A. Richardson : A Method of 



Rock-Analysis Diagrams Based on Statistics. — L. J. Spencer : 



Identity of Trcchmann's " 6-tin " with Stannous Sulphide. — 



Dr. G. P. H. Smith : Linarite, Caledonite, and Associated Minerals 



from Cumberland. — Dr. G. T. Prior : The Adare and Ensisheim 



Meteorites. 

 Institution or Petroleum Technologists (at Royal Society of 



Arts), at 5.30.— S. H. Garner: The Carbonisation of Lubricating 



Oils. 

 Royal Photographic Society or Gbeat Bsitain, at 7.— Capt. C. W. R. 



Knight : Falconry. 

 Illuminating Engineering Society (at Royal Society of Arts), at 



8.— J. 0. Elvy and Others : Use and Abuse of Light in Studios 



for Cinema Film Production. 



WEDNESDAY, January 19. 

 Royal College or Suegeons or England, at 5.— Prof. A. Keith : 



The Principles of Craniology applied to Clinical and Racial 



Problems. 

 Geological Society of London, at 5.30. — Dr. L. J. Wills and B. 



Smith : The Lower Palffiozoio Rocks of the Llangollen District, 



with Espeoiai Reference to the Tectonics. 

 ROTAL Society of Arts, at 8. — F. M. Lawson : The Future of In- 

 dustrial Management. 

 Entomological Society or London (at fl Chandos Street, W.l), at 



8 (Annual Meeting). 

 Institute op Chemistry (London Section), at 8.— W. G. Young and 



Others : Discussion on The Institute of Chemistry : What it Can, 



Cannot, Should, or Should Not Do. 

 Royal AIeteorological Society (Annual General Meeting) (at Royal 



Astronomical Society), at 8. — R. H. Hooker : Forecasting the 



Crops from the Weather (Presidential Address). 

 Royal Miceoscofical Society, at 8 (Annual Meeting). 



THURSDAY, January 20. 



Royal Institution of Geeai Beitain, at 3.— Dr. A. Harden : 

 Biochemistry (Vitamines). 



JBoyal Society, at i,30.^Probable Papers. — Sir Robert Hadfield, 

 Bart., S. R. Williams, and I. S. Bowen : The Magnetic Mechanical 

 Analysis of Manganese Steel. — Dr. W. S. Tucker and E. T. Paris : 

 A Selective Hot Wire Microphone — E. A. Milne and R. H. Fowler ; 

 Siren Harmonics and a Pure Tone Siren. — Prof. L. V. King : 

 The Design of Diaphragms capable of Continuous Tuning. 



LiNNEAN Society, at 5. 



Royal Aeronautical Society (at Royal Society of Arts), at 5. — 

 Lord Montagu of Beaulieu : The Cost of Air Ton-miles compared 

 with Other Forms of Transport. 



Institution or Mining and Metallurgy (at Geological Society), 

 at 5.30. — R. E. Palmer : Some Observations on Mining by the 

 Opencast or Stripping Method. — E. A. Wraight : The Standardisa- 

 tion of Materials Employed in Mining and Milling Plant. — A. M. 

 Pontic ; Notes on the High-level Diamond Deposits of Brazil. 



Institution of Automobile Engineers (London Graduates' Meet- 

 ing), at 8.— W. H. Wardall : Cylinder and Piston Wear. 



Chemical Society, at 8. — J. V. Backes, R. W. West, and M. A. 

 Whitcley : Quantitative Reduction by Hydriodic Acid of Halo- 

 genated Malonyl Derivatives. Part I., The Amides of Sym. 

 Dialkyl and Aryl Substituted Amides of Mono- and Di-bromomal- 

 onic Acid. — B. M. Gupta : An Investigation on the Influence of 

 Negative Groups of Different Character on the Reactivity of 

 Hydrogen Atoms Carried by the Same Carbon Atom. Part I.— 

 J. Bronsted : The Influence of Salts upon the Chemical Equilibria 

 in Solution. — H. Hepworth : The Action of the Grignard Reagent 

 on Certain Nitric Esters.— G. T. Morgan and H. D. K. Drew : 

 Researches on Residual Affinity and Co-ordination. Part III., 



Reactions of Selenium and Tellurium Aoetylaoetonei. — O. T. 

 Morgan and D. C. Vining : Dihydroxynaphthaldehydes. — O. T. 

 Morgan : Ortho-chlorodinitrotoluencs. Part II.— C. K. Ingold : 

 The Conditions Underlying the Formation of Unsaturated and of 

 Cyclic Compounds from Halogenated Open-chain Derivativea. 

 Part I., Products Derived from a-Halogenated Olntaric Aoida.— 

 A. Findlay and W. Thomas : Influence of Colloids on the Rate of 

 Reactions involving Gases. I., Decomposition of Hydroxylamine 

 in Presence of Colloidal Platinum. — M. Nierenstcin : The Con- 

 stitution of Cateohin. Part III., Synthesis of acaCatechin. — 

 K. G. Naik : The Formation and Properties of Dithioketones 

 (R2C = 8=8) and Dlthiocthers (R2.-( = Sl. I'art I., Ihe l're|Mration 

 of Certain Dithioketones and Dithioethers. — W. N. Haworth and 

 E. L. Hirst : The Constitution of the Disaccharides. Part V., 

 Cellobiose (Cellose).- S. H. C. Briggs : The Elements Regarded 

 as Compounds of the First Order. — J. D. Morgan and R. V. 

 Wheeler : Phenomena of the Ignition of Gaseous Mixtures by 

 Induction Coil Sparks. — E. J. Williams : Chloroform Solutions of 

 Hydrogen Chloride.^L. J. Hudleston and H. Bassett ; Equilibria 

 of Hydrofluosilicic Acid. — E. Newbery : Chlorine Overvoltageg. — 

 P. Ray and P. V. Sarkar : Compounds of Hexamethylenet«tramiiie 

 with Complex Metallic Salts and Acids. 

 RoNTOEN Society (in Physics Laboratory, University College), »t 

 8.15.— M. A. Codd : Increasing the Efficiency of X-ray Tob«» by 

 an Improved Design of Coil and Interrupter. 



FRIDAY, Jancaei 21. 



Royal Society of Arts (Indian Section), at 430.— Prof. K. S. 

 Troup : Indian Timbers. 



Royal College or Suegeons or England, at 5. — Prof. A. Keith : 

 The Principles of Craniology applied to Clinical and Racial 

 Problems. 



Institution of Mechanical Engineers, at 6. — H. J. Smith : The 

 Mechanical Loading of Ships. 



Institution or Electeical Engineers (at Faraday House, South- 

 ampton Row), at 6.30.- H. J. Howard ; Electric Welding. 



SATURDAY, Januaby 22. 

 Physiological Society (at King's CBllege), at 4. 



CONTENTS. PAGE 



The Development of Agriculture ... 621 

 The Critic in Physiology. By Prof. W. M. Bayliss, 



F.R.S. . . . 622 



Life in the Misty Islands 624 



Modern Oil-finding. By H. B. Milner 625 



The Induction Coil of To-day 626 



Our Bookshelf 627 



Letters to the Editor : — 



Science and Fisheries.— Prof. J. Stanley Gardiner, 



F.R.S • • • ^^* 



The Central Meteorological and Geodynamic Institute, 



Vienna.— Profs. F. M. Exner and J. Hann . 629 

 Tidal Power. (IVieA Diagram.)— fi.. Mallock, 



F.R.S. ... 629 



Heredity and Acquired Characters. — Prof. E. W. 



MacBride, F.K.S. ; J. T. Cunningham . . . 630 

 Solar Radiation in Relation to the Position of Spots 



and Faculae.— H. H. Clayton . . 630 



OdoursCausedbyAttrition.— Prof. J. R. Partington 631 

 The Energy of Cyclones.— R. M. Deeley . . .631 

 Nature of Vowel Sounds. (IWuzUated.') By Prof. 



E. W. Scripture . 632 



Nitrate Supplies and the Nitrogen Industry 634 

 Industrial Research Associations. VIII. The 

 British Photographic Research Association. By 



Dr. T. Slater Price 63S 



Obituary : — 



Sir Lazarus Fletcher, F.R.S 636 



Notes 638 



Our Astronomical Column : — 



Skjellerup's Comet . 642 



History of the Chronometer 642 



The Planetesimal Hypothesis 642 



The Physical and Optical Societies' Exhibition . . 643 



The Headmasters' Association 643 



The Mathematical Association. By C. G 644 



The Geographical Association 645 



The Origin of Hypergamy 646 



Studies in British Forestry ... 646 



Greenland in Europe. By David MacRitchie ... 647 



Prize Awards of the Paris Academy of Sciences . . 648 



University and Educational Intelligence . . . 649 



Calendar of Scientific Pioneers 650 



Societies and Academies 651 



Books Received 651 



Diary of Societies 651 



NO. 2672, VOL. 106] 



