64 



NATURE 



[March io, 192 i 



SATURDAY, Maech 12. 

 EoTAL Institution or Gbeat Britain, at 3. — Sir Ernest Ruther- 

 ford : Electricity and Matter. , . , „ . 

 Phtsiological Societt (at Institute of Physiology, University 

 College), at 4. 



^ MONDAY, Makch 14. 



Biochemical Societi (Annual General jUeeting) (at Lister In- 

 stitute). ^ , CI- 



Boyal Geogbaphical SociEir (at Lowther Lodge), at 5.— Col. Sir 

 Charles Close, G. T. McCaw, and A. R. Hinks : Notes on New 

 Map Projections. , _ _ _ 



Roxal Society or Medicine (War Section), at 5.30. — Col. H. E. R. 

 James : The Best Form of Instruction for Medical Students to 

 Fit Them to take Their Part in Case of National Emergency. 



Royal Society of Medicine, at 5.30. — Sir John McFadyean and 

 Others : Discussion : The Eradication of Tuberculosis in Men and 

 Animals. . > , j. 



Institution of Electbical Engineebs (Informal Meeting) (at 

 Chartered Institute of Patent Agents), at 7.— R. L. Morrison and 

 Others : Discussion on Rectifiers. 



Institute or Mechanical Engineebs (Graduates' Meeting), at 7. — 

 A. J. Watson : Commercial Motor-Vehicles. 



SuBVEYOBs' Institution (Junior Meeting), at 7.— J. G. Elsworthy : 

 Conversion of Buildings to Jleet Modern Requirements. 



RoTAL Institute or Beitish Abchitects, at 8. — H. P. Adams : Cot- 

 tage Hospitals. 



Royal Society of Abts, at 8.— Major G. W. C. Kaye : X-rays and 

 their Industrial Applications. 



Medical Society of London (at 11 Chandos Street, W.l), at 8.30.— 

 Sir Henry Gauvain and Others : Non-operative Treatment of 

 Surgical Tuberculosis. 



TUESDAY, Maech 15. 



Royal Institution or Gbeat Bbitain, at 3. — Prof. A. Keith : 

 Darwin's Theory of Man's Origin, in the Light of Present-Day 

 Evidence. 



Royal society of Medicine (Therapeutics and Pharmacology Sec- 

 tion), at 4.30.— P. B. Roth: The Uses of Heliotherapy. 



Royal Society op Medicine (General Meeting), at 5. 



Royal College or Physicians of London, at 5. — Dr. A. Whitfield : 

 Some Points in the Etiology of Skin Diseases (Lumleian Lec- 

 tures). 



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

 'James Wilson : The World's Wheat. 



Institution or Petboleum Technologists (at Royal Society of 

 Arts), at 5.30. — J. Kewley : The Crude Oils of Borneo. 



National Union of Scientific Wobkebs (in the Geology Theatre, 

 Royal School of Mines), at 6. — W. Brierley : Personal Impressions 

 of American Biological Research. 



Royal Photogbaphic Society or Great Britain, at 7. — A. S. New- 

 " man : The Design and Construction of the Reflex Camera. — 

 Major A. Abrahams : The Use of the Reflex Camera. 



RoiAL Anthbopological Institute (Special Meeting), at 8.15. — 

 E. Torday : Cultftre and Environment : Cultural Differences 

 among the Various Branches of the Batetela. 

 WEDNESDAY, March 16. 



Institution of Naval Architects (at Royal United Service Institu- 

 tion), at 11. — Duke of Northumberland: Presidential Address. — 

 Sir Eustace D'Eyncourt : Some Features of German Warship 

 Construction. — S. V. Goodall : Ex-German Battleship Baden. — 

 W. R. G. Whiting : The Strength of Submarine Vessels. 



Royal Meteorological Society (at Royal Astronomical Society), at 

 5. — Dr. G. C. Simpson : The South- West Monsoon (Lecture). 



Institution or Electrical Engineers (Wireless Section) (at Institu- 

 tion of Mechanical Engineers), at 6. — G. Stead: The Effect of 

 Electron Emission on the Temperature of the Filament and 

 Anode of a Thermionic Valve. — Miss W. A. Leyshon and Prof. 

 \v . H. Eecles : Some Thermionic Tube Circuits for Relaying 

 and Measuring. 



Royal Society of Arts, at 8.— C. A. Mitchell : Science and the 

 Investigation of Crime. 



Royal Micboscopical Society, at 8. 



THURSDAY, March 17. 



Institution of Naval Abchitects (at Royal United Service Institu- 

 tion), at 11. — R. J. Walker and S. S. Cook: Mechanical Gears of 

 Double Reduction for Merchant Ships. — E. W. Blocksidge : Life- 

 saving Appliances on Cargo and Passenger Vessels. — M. E. Denny : 

 The Design of Balanced Rudders of the Spade Type. 



Institution of Naval Abchitects (at Royal United Service Institu- 

 tion), at 3.— H. B. W. Evans: Standardisation of Data for Airship 

 Calculations. 



RoTAL Institution of Gbeat Bbitain, at 3. — Dr. G. C. Simpson : 

 The Meteorology of the Antarctic. 



Chemical Society (Annual General Meeting), at 4. 



Hoyal Society, at 4.30.— Probable Papers.— Lord Rayleigh : The 

 Colour of the Light from the Night Sky.— R. 0. Street : The 

 Dissipation of Energy in Permanent Ocean Currents, with Some 

 Relations between Salinities, Temperatures, and Currents. — S. 

 Datta : The Vacuum Arc Spectra of Sodium and Potassium.— 

 W. E. Garner and 0. L. Abernethy : Heats of Combustion and 

 Formation of Nitro-compounds. Part I. Benzene, Toluene, 

 Phenol, and Methylaniline Series.— E. K. Rideal : The Catalytic 

 Dehydrogenation of Alcohols. 



Royal College of Physicians of London, at 5.— Dr. A. Whitfield : 

 Some Points in the Etiology of Skin Diseases (Lumleian Lec- 

 tures). 



. Linnean Society, at 5.— W. B. Alexander : The Vertebrate Fauna 

 of Houtman's Abrolhos Islands, West Australia.— Prof . P. Pauvel : 

 AnnelidPs Polych&tcs de I'Archipel Houtman Abrolhos.— P. Chap- 

 man : Sherbornina : A New Genus of Foraminifera from Table 

 Cape, Tasmania. 

 RoTAL Aeronautical Society (at Royal Society of Arts), at 5.30.— 

 Capt. D. Nicolson : Flying-Boat Construction. , 



Institution of Mining and Metallurgy (at Geological Society), at 

 5.30.— E. H. Clifford : Scheme for Working the City Deep Mifte 

 at a Depth of 7000 feet (adjourned discussion). — A. E. Pettit : 

 Notes and Records of Mining Costs. 



Institution or Electrical Engineers (at Institution of Civil 

 Engineers), at 6.— Sir William Noble: The Long-distance Tele- 

 phone System of the United Kingdom. 



Institution of Automobile Engineers (London Graduates' Meet- 

 ing) (at 28 Victoria Street), at 7.30.— H. B. Benny and D. J. 

 Maoklin : Modern Tendencies in Automobile Engine Design. 



Illuminating Engineering Society (at Royal Society of Arts), at 8. 

 — Major A. Garrard and Others : Motor-Car Headlights : Ideal 

 Requirements and Practical Solutions. 



Institution or Naval Architects (at Royal United Service Institu- 

 tion), at 8.— Prof. T. B. Abell : A Study of the Framing of Ships. 



ROntqen Society (in Architecture Theatre, University College), at 

 8.15.— E. A. Owen and Phyllis K. Bowes : X-ray Dosage, with 

 Special Reference to the Barium Platino-cyanide Pastille. 



Hahveian Society (at Town Hall. Paddins'ton Green), at 8.30. — 

 Dr. L. Williams: The Thymus Gland in Everyday Life. 

 FRIDAY, March 18. 



Institution of Naval Architects (at Royal United Service Institu- 

 tion), at 11. — K. G. Finlay : The Spacing of Transverse Bulkheads. 

 —A. M. Robb : Deflections of Bulkheads and of Ships.— J. J. 

 King-Salter : Some Experiments on Tallows in their Use for the 

 Launching of Ships. 



MoNTESsoRi Society (at University College), at 5.45. — F. Watts: 

 Common Sense about Intelligence Testing. 



Institution of Mechanical Engineers, at 6. — Prof. E. G. Coker, 

 K. C. Chakko, and M. S. Ahmed : •Contact Pressures and Stresses. 



Royal Society of ;MEDicrNE (Electro- Therapeutics Section), at 8.30. — 

 Prof. W. D. Halliburton : Physiological Advance : The Importance 

 of the Infinitely Little (The Mackenzie-Davidson Memorial Lec- 

 ture) . 



Royal Institution of Great Brttatn, at 9.— Sir Frederick Bridge : 

 The Researches of a Musical Antiquarian. 

 S.iTURD.^Y, March 19. 



RoTAL Institution of Great Britain, at 3. — Sir Ernest Rutherford : 

 Electricity and Matter. 



CONTENTS. PAGE 



Oceanographic Problems. ByJ. J. . 33 



Problems of Life and Mind ^S 



Plant Biology. By F. K 37 



British Coal-fields. By H. L 38 



Practical Aeroplane Photography. By H. H. T. . . 39 



Our Bookshelf . ....... 40 



Letters to the Editor:— 



The Disintegration of Elements by o- Particles. — Sir E. 



Rutherford, F.R.S., and J. Chadwick 41 



The Atomic Volume of Isotopes.— Prof. Frederick 



Soddy, F.R.S. . 41 



Relativity and the Velocity of Light.— C, O. Bartrum ; 



J. H.Jeans, Sec.R.S. . 42 



Relativity and the Deviation of Spectral Lines.— Prof. 



H. J. Priestley . . . 43 



Amplifying the Optophone.— James Weir French . 43 

 The Peltier Effect and Low-temperature Research. — 

 Dr. Geoffrey Martin ; A. A. Campbell Swinton, 



F.R.S .... 43 



The Sound of Distant Gun-fire. — Father V. 



Schaffers, S.J. 44 



The Designation of Vitamines. — Prof. A. Liversidge, 



F.R.S ..... 45 



Scientific Names for Commercial Timbers. — Richard 



T. Baker . 45 



"Elementary Practical Biochemistry." — Prof. W. A. 



Osborne ... 45 



Colloids and Colloidal Electrolytes, (^lUustrated.) By 



Prof. J. W. McBain 46 



Inland Waterways. {Illustrated.) By Dr. Brysson 



Cunningham ... 48 



Recent Work at Stonehenge . 50 



Obituary ,....,.... 50 



Notes ... 51 



Our Astronomical Column : — 



Large Meteors on March I and 2 55 



Pons-Winnecke's Comet . 55 



Two Nebiilse with Unparalleled Velocities ...... 55 



The Chicago Meeting of the American Association . 56 



Indian Agriculture. By Dr. W. E. Brenchley ... 58 



Precious Stones in 1919. By L. J. S 59 



Copper Deposits of Arizona 59 



University and Educational Intelligence ... 60 



Calendar of Scientific Pioneers 61 



Societies and Academies 61 



Books Received 63 



Diaty of Societies ....... 63 



NO. 2680, VOL. 107] 



