488 



NATURE 



[December 8, 192 1 



IloiAL Geographical Societt (at Lowtlier Lodgo, Kensington Gore, 



8.\V."), at 5.— Capt. J. B. L. Noel: Photographic Kquipment 



and Methods for Travellers. 

 BoTAL Society of Akts, at 8.— A. M. Hind : Processes of Engraving 



and Ktchiiig {Cantor Lecture) (3). 

 Si-RVKroRs" TxsTiTiTiox. at 8.— A. A. Hudson: The Relation of 



Soil to Plant Growth, and in Particular when Influenced by 



the Presence or Absence of Lime. 



TVKSDAY. Decembfh 13. 

 RoTAL Horticultural Societt, at 1. 

 Evoe.nics Edication Society (at Royal Society), at 5. — Prof. K. \V. 



MacBride : The Inheritance of Acquired Characters and its Bear- 

 ing on Eugenic Theory and Practice. 

 Institution- of Civil Engineers, at 6 — E. Latham : Deep-water 



Quays : General Considerations of Design. — F. E. Wentworth- 



t/heilds : The Stability of Deep-water Quay-walls. 

 Royal Photographic Society of Ghe.at Britain, at ". — Technical 



Meeting. 

 Quekett 3IICROSCOPICAL Clvb, at 7.30.— T. E. Wallis : Microscopy as 



an aid to Analysis. 

 Faraday Society (at Chemical Society), at 7.45. — Annual General 



Meeting. 

 Chemical Industiit Club and Loxdon Section of Society of 



Chemical Industry (at Institution of Mechanical Engineers), at S. 



— Cineniatogrnph Films on the Winning and Working of Sulphur. 



— The Manufaejture of Steel: Crucible,' Open Hearth, Electric, and 



Bessemer Processes.- — The Metallurgy of Zinc. 

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



8. — W. J. Sandeman and others : Discussion : Progress in Gas 



Lighting in Relation to Illuminating Engineering. 

 Faraday Society (at Chemical Society), at 8.15.— Prof. A. O. 



Por.iji^n. xho Structure of Gaseous Molecules. 

 Royal .\NTHROPOLOGic.tL Institute, at 8.15.— N. W. Thomas : The 



Week in West Africa. 



WEDyESDAY, December 14. 



Society of Glass TECHNOuoGYiin Chemistrv Lecture Theatre. Univer- 

 sity College), at 2.45.— T. Stott : Note on Pipettes.— A. J. Dalladay 

 and F. Twyman : 5feasuring small variations of Refractive Index 

 throughout Meltings of Optical Glass. — F. Twyman : The Anneal- 

 ing of Glassware, and Annealing without Pyrometers 



Royal College of Surgeons of England, at 5.— H. .1. Waring : The 

 Onerative Treatment of Malignant Disease : Its Possibilities and 

 Limitations (Bradshaw Lecture). 



Royal Meteorological Society, at 5. — Discussion on Visibility, 

 opened by F. J. W. Whipple : A general survey of the subiect : 

 Wing Commander 'S\. G. Christie : from the Air Pilot's point of 

 view ; Captain Sir David Wilson-Barker : from the Seaman's point 

 of view : Dr. J. S. Owens : London Fogs. 



Institution of Automobile Engineers (at Institution of Mechanical 

 Engineers), at 8. — H. F. L. Orcutt :. 'Motor-car Gear Bo.xes. 



Royal Society of .Arts, at 8 — Sir Walter B. Townley : Trade with 

 the Netherlands East Indies. 



THURSDAY, December 15. 



LiNNEAN Society of London, at 5 



Newcomex Society (at King's College, Strand, W.C.2), at 5.— An- 

 nual General ileetin?.— At 5.15.— R. C. S. Walters : Greek and 

 Roman Engineering Instruments. 



I,ONDON Mathematical Society (at Royal Astronomical Society), at 5. 

 — J. H. .Jeans : The New Dynamics of the Quantum Theory (Lec- 

 ture). The following papers will be taken as read : — W. P. Milne : 

 The Relations Between Apolarity and Clebsch's Mapping of the 

 Cubic Surface in a Plane.— Miss G. O. Sadd : Certain Types 

 of Plane I'nicursal Curves.— H. ^M. Shaffer : The General Theory 

 of Notational Relativity .^-Pundit Oudh Upadhyaya : (1) Note on 

 Gauss's Quadratic Identity ; (2) A General Formula in Cubic 

 Forms. — J. R. Wilton: Gibbs's Phenomenon in Fourier's Series 

 and Integrals. 



Institutio.v of ^Fining .and Metalluioy (at Geological Society), 

 at 5.30.^ — Discussion on Paper by H. F. Collins : The Igneous 

 Rocks of the Province of Huelva and the Genesis of the Pvritic 

 Orebodies. — .\. T. Reis : Underground Working of Wide Pyritic 

 Orebodies. 



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

 — Capt. F. Jl. Green : Development of the Fighting Aeroplane. 



Child Study Society (at Roval Sanitary Institute), at 6. — Miss 

 von Wyss : Vital Elements in Art Teaching. 



Institution of Electrical Engineers, at 6. — L. H. A. Carr : Induc- 

 tion-type Synchronous ^fotors. 



Concrete Institute, at 7.30. — E. F. Sareeant : (a) The Preparation 

 of Concrete' .-VeeTee-ates ; ^6) ^lovine Forms. 



Chemical Society, at 8.^J. T. Morgan and .1. D. Main Smi^^h : 

 Researches on Residual .\fflnity and Co-ordination. Part Vll.. 

 Cobaltic Lakes of the Aliiarin Series. 



FPIDiY. December 16. 

 Institution of Mechanical Engineers, at 6. — G Mitchell: Conveying 

 and Elevatine Machinery. — R. E. Knisrht : Dischfirge of Grain 

 Cargoes in the Port of London bv Pneumatic Elevators. 

 Royal Photoghaphic Socfty of Great Britain (Pictwrial Group), 

 at 8. — L. Richmond : Address. 



SATrnnAY. Dfcembkr 17. 

 Physiological Society (at London Hospital). 



PUBLIC LECTURES. 



(A number in braeketn ivdicati'ii the number of a lecture 

 in a gerieg.) 



THURSDAY, Df<;embf.r R. 

 Hospital fob Sick Children (Gt. Ormond Street, W.C.I), at 4.— 

 H. A. T. Fairbank : Coxa Vara. 



University College, at 5 —Prof . J. E. O. De Montmorency : Feudal 



Vestiges in America and Elsewhere (6). 

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



Recent Advances in Genetics (6). 

 Kino's College, at 5.30.— H. W. Pit«-8imons : Bridge Ctmstruo- 



tion (5). 

 St. John's Hospital (Leicester Square, W.C.2), at 6— Dr. W. Griffith : 



Eczema (Chesterfield Lecture). 

 Barnes Hall (1 Wimpole Street, W.l), at 8.— Dr. C. Singer: The 



History of the Doctrine of Infection (Chadwick Lecture). 

 FRIDAY, December 9. 

 University College, at 8.— Prof. G. Dawes Hicks : Our Knowledge 



of the Real World (6). 



SATURDAY, December 10 

 Imperial College of Science and Technology, at 10.30 a.m. — Prof. 



W. W. Watts: Geology as a Basis for Geography (Lectures for 



Teachers). 



MOyD.lY. December 12. 

 Royal College of Surgeons, at 4,^F. W. Twort : Recent Researcli' 



on the Biology of Bacteria (Brown Lecture) (1). 

 King's College," at 5.30.— H. Moore: Liquid Fuels (5) 



TUESDAY. December 13. 



Royal College of Surgeons, at 4. — F. W. Twort : Recent Researches 

 on the Biology of Bacteria (Brown Lecture) (2). 



King's College. "at 5.30.— Prof. H. Wildon Carr: The Modern Scien- 

 tific Revolution and its Meaning for Philosophy (10). — Dr. W. 

 Brown : Psychology and Psychotherapy (9). 



WEDNESDAY, December 14. 

 School of Oriental Studies, at 5. — .1. W. Gill : The Arab Intrusion 

 into Bornu. 



THURSDAY, December 15. 

 Royal College of Surgeons, at 4.— F. W. Twort : Recent Researcli 



on the Biology of Bacteria (Brown Lecture) (3). 

 University College; at 5.— Prof. J. E. G. De Montmorency : Religion 

 and Feudalism (7). 



CONTENTS. PAGE 



Imperial Water Power 457 



The Denomination "Chemist" 458 



Echinoderm Larvae and their Bearing on Classifica- 

 tion. Bv Dr. F. A. Bather, F.R.S 4S9 



Rlectrotechnical Theory. By A. R 461 



British Scientific and Technical Books. By F. W. 



Clifford 462 



The Statecraft of Ancient Greece. By H. W. C. 463 

 Our Bookshelf . . ... 463 



Letters to the Editor:— 



Pronagation of Waves in an Isotropic Solid. ( fF/M 



/?/a^-«wj.)— A. Mallock, F.R.S. . . .465 



The Action of Sunlight : A Case for Inquiry.— Dr. 



C. W. Saleeby 466 



Relativity and Materialism. — Prof, H. Wildon 



Carr; Canon Edmund McClure . ... 467 

 The Radiant Spectrum. {illustrated.)— "Dr. H. 



Hartridge " ' t " i? "^^^ 



Microscope Illumination and Fatigue. — J. E. 



Barnard " " « r ' t '' 



Hybridity and the Evolution of Specie;.— Prof. J. 



Bronte Gatenby . . • 469 



A Simple Micro-barograph. {Illustrated.) — A. 



. Wechsler ^ / ^r -w " ""^ 



Scientific Workers in Russia.— Prof. V. Koren- 



chevsky ^- \.- i^ ' t "^^ 



The Maintenance of Scientific Research. By Prof. 

 C. S. Sherrington, Pres.R.S, . . . . . . ■ • 47©, 



The Rayleigh Memorial: The Unveiling in West- 

 minster Abbey. {Illustrated) . ■ ^ • • ._ ' "^^J , 

 International Phvsico-chemical Symbols. By 



Prof. Alex. Findlay 474 



Obituary:— 



Dr. J. A. Allen 475 : 



W. A. Baillie-Grohman 475 ! 



Notes . 470 I 



Our Astronomical Column : — , r /- 1 • 



The Effective Wave-Length of the Light of Ga actio 



S.3,-<; ... 4*0 



The Dynamical Equilibrium of the Stellar System 480 



Observations wi-h the Cookson Floating Telescope . 4S0 ; 



Progress in Palaeontology. By G. A. J. C. ... 45i 



The Tea Industry • 4»2 : 



University and Educational InteUigence . . , . 4»3 



Calendar of Scientific Pioneers 4^4 



Societies and Academies 455 



Books Received "* J , 



Diary of Societies 4^7 



NO. 2710, VOL. 108] 



