t)84 



NAi URE 



[January 20, 192 1 



Rcsearobe* on Besidual Affinity and Co-ordination. Part III., 

 Ucactions of Selenium aud Tellurium Aoetylacctones.— O. T. 

 Morgan and D. C. Vining : Dihydroxynaphthaldebjdes. — G. T. 

 Morgan : Ortlio-ohlorodinitrotoluenes. Part II. — C. K. Ingold : 

 The Conditions Underlying the Pormation of Unsaturated and of 

 , Cyclic Compounds from Halogenated Open-chain DerivatiTes. 

 Part I., Products DeriTed from a-Halogenatcd Olutaric Acids.— 

 A, Findlay and W. Thomas; Influeuee of Colloids on the Hate of 

 Uoautions involving Oases. 1., Decomposition of Hydrcxylamine 

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

 stitution of Catcohin. Part 111., Synthesis of ocoCateohin.— 

 K. O. Naik : The Formation and Properties of Dithiokctones 

 (R5!C=S = 8) and Dithloethers (li^S^S). I'art I., I he I'ltpHration 

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

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

 Cellobiose (Cellose).— 8. H. C. Briggs : The Klements Regarded 

 as Compounds of the First Order.— J. D. Jlorgan and E. T. 

 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 : F.quilibria 

 of Hvdrofluosilioic Acid.— F,. Newbery : Chlorine Overvoltages.— 

 P. R&y and P. V. Sarkar : Compounds of Hexamethylenetctramine 

 with Complex Metallic Salts and Acids. 



RoirTOEN SociEii (in Physios Laboratory, University College), at 

 8.15.— M. A. Codd : Increasing the Efficiency of X-ray Tubes by 



■ an Improved Design of Coil and Interrupter. 



FRIDAY, JAWCABI 21. 



BoTAL SociETT OF AHTS (Indian Section), at 4.30. — Prof. B. S. 



Troup : Indian Timbers. 

 BoiAL sociEir or Medicine (Otology Section), at 5. — T. B. Rodger: 



Cavernous Sinus Thrombosis. 

 BoiAL College or Suboeons or Enoland, at 5. — Prof. A. Keith : 



The Principles of Craniology applied to Clinical and Racial 



Problems. 

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

 , Mechanical Loading of Ships. 



iNSTiTfTioN or Electrical Engineers (at Faraday House, South- 

 ampton Row), at ().30.— H. J. Howard : Electric Welding. 

 OxoLooisTS' Association (at University College), at 7.30. — G. 



Barrow : The Origin and Age of Post-Eocene Brick-earths near 



London. 

 JuNiOB Institution or Engineers (at Caxton Hall), at 8.— B. H. 



Joy : Motor Yachts. 

 Royal Society or Medicine (Electro-Therapeutics Section), at 8.30. 



—Dr. W. J. Turrell : The Therapeutic Activity of the Galvanic 



Current. 



SATVnVAT, Januaby 22. 



British Mtcological Society (in Botanical Department, University 

 College, Gower Street), at 11 a.m. — F. T. Brooks : Some Tomato 

 Fruit Diseases. — Dr. E. J. Butler : The Imperial Bureau of 

 Mycology. — Miss G. Lister : A New Genus of the Mycetosoa from 

 Ja'pan.— T. Fetch : Thread Blights.— Dr. H. Wager : The Action 

 of Gravity on the Fungi. — J. Ramsbottom : Exhibit of Lantern 

 .Slides showing Fungal Infection of Orchid Seeds. 



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



MONDAY, January 24. 



EoYAL College of Surgeons of England, at 5. — Prof. A. Keith : 



The Principles of Craniology applied to Clinical and Racial 



Problems. 

 BOYAL Society of Abts, at 8. — A. E. L. Chorlton : Aero Engines 



(Howard Lectures). 

 BOYAL Society of Medicine (Odontology Section), at 8. — Sir Frank 



Colyer : Old Dental Instruments. 

 Royal Geogbaphical Society (at ^olian Hall), at 8.30.— P. C. 



Cornell : The Lower Reaches of the Orange River. 

 Medical Society of London, at 8.30.— Dr. A. Foiling : Multiple 



Neuritis. 



TUESDAY, January 25. 



Royal Horticultubal Society, at 3. 



Royal Institution of Great Britain, at 3.— Sir Gerald P. Lenox- 

 Conyngham : The Progress of Geodesy in India. 



Institution of Civil Engineers, at 5.30. — Resumption of Discussion 

 on paper by Prof. T. B. Abell on Reinforced Concrete for Ship- 

 Construction. — G. Ellson : Cannon Street Bridge Strengthening. 

 — F. W. A. Handman : Reconstruction of a Viaduct. 



BoYAi Society of Medicine (Medicine Section), at 5.30.— Dr. P. J. 

 Cammidge : Some Observations Bearing on the Etiological Classi- 

 fication of Diabetes Mellitus. — Dr. E. P. Poulton : The Treatment 

 of Peptic Ulcer by Means of Gastric and Qastro-duodenal Tubes. 



Royal Photographic Society of Great Britain, at 7.— Dr. F. M. D. 

 Berry : Serbia and Jugoslavia Before the War and After. 



Royal Anthbofolooical Tsmiivn (Annual General Meeting), at 

 8.16. 



WEDNESDAY, Januaby 26. 



BoYAL Society of Arts, at 4.30.— A. Abbott : The Origin and De- 

 velopment of the Research Associations Established' by the 

 Department for Scientific and Industrial Research. 



Royal College of Surgeons of England, at 5. — Prof. A. Keith : 

 The Principles of Craniology applied to Clinical and Racial 

 Problems. 



iJrSTiTUTioN OF CiTiL ENGINEERS (Students' Meeting), at 6.— F. E. 

 Wentworth-Sheilds : The Lay-out and Equipment of Docks 

 (Vernon-Hareourt Lecture). 



THURSDAY, JurouiY 27. 



Botal lN8TiTDTiO!f OF Qbut Bbitain, at 3.— Ur. A. Harden : Bio- 

 chemistry (Vitamioe8>. 



Royal Society, at t.M.— Probable Papert,— K. Sa«u and Prof. C. 8. 

 Sherrington ; The Myogram of the Flexor-reflex evolved by a 

 Single Break-shock. — Sir Almroth Wright : " Interaction " Be- 

 tween Albuminous Substances and Saline Solutions. — Ur. S. Boaa. 

 Dr. Helen Chambers, and Gladwys M. Soott : The Local and 

 Generalised Action of Badium and X-rays upon Tumour Growth. 



Royal Sociiti of MiDicin (Balneology and Climatolog? Section), 

 at 5.30.— Dr. O. L. Pardington : Advancing Teara aad Balneo- 

 therapy (Presidential Address). 



Institution or Electbical ENoiNXEBa (at Institution of Civil 

 Engineers), at 6.— O. A. Juhlin : Temperature Limit* of Large 

 Alternators. 



Royal Society of Medicine (Urology Section), at 8.30.— T. Walker: 

 Obstruction After Suprapubic Prostatectomy and an Open Opera- 

 tion for its Prevention. 



FRIDAY, Januaby 28. 



Association or Econouic Biologists (at Imperial College of 

 Science), at 2.30. — Dr. L. Lloyd: Greenhouse White Fly and its 

 Control. — W. B. Brierley : Personal Impresaions of Some American 

 Biologists and their Problems. 



Royal Society of Medicine (Study of Disease in Children), at 5. — 

 Dr. P. Parkinson : A Case of Patent Ductus Arteriosas. 



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

 The Principles of Craniology applied to Clinical and Racial 

 Problems. 



Physical Society or London (at Imperial College of Science), at 5. 

 — Prof. H. Nagaoka : The Magnetic Separation of the Neon Lines 

 and Runge's Rule.— Capt. E. V. Appleton : A Method of Demon- 

 strating the Retro-active Property of a Triode Oscillator. — Dr. 

 D. Owen and R. M. Archer : The Quickness of Response of Cur- 

 rent to Voltage in a Thermionic Tube. 



Royal Society of Medicine (Epidemiology and State Medicine Sec- 

 tion), at 8.30.— Dr. A. 8. M. MacGregor : Some Features of CoT- 

 rent Sraall-pox in Glasgow. 



Royal Institution of Great Bbiiain, at 9. — Sir James Dewar : 

 Cloudland Studies 



NO. 2673, VOL. 106] 



CONTENTS. 



PAGE 



Scientific Education in the Metropolis . . . 6<;3 



General Dynamics. By Prof. A. Gray, F.R.S. . . 655 



Maya Civilisation. By T. A. Joyce 656 



The History of Determinants. By G. B. M. ... 658 



Science and Farming. By E. J. R 659 



Our Bookshelf ... 660 



Letters to the Editor:— 



The Late Srinivasa Ramanujan. — Prof. E. H. 



Neville 661 



The Mechanics of Solidity. — J. Innes ...... 662 



Stellar Development in Relation to Michelson's 

 Measurement of the Diameter of Betelgeux. — Dr. 



T. J. J. See 663 



Heredity and Variation. — Dr. R. Ruggles Gates . 663 



The Mild Weather.— Chas. Harding ... 663 



Nature of Vowel Sounds. IL (Illustrated.) By 



Prof. E. W. Scripture . . . . 664 



Toxic Root-interference in Plants. By B. T. P. B. 666 

 Obituary : — 



Sir William Peterson, K C.M.G. By G. R. P. . 668 

 Alexander Muirhead, F.R.S. By Sir Oliver 



Lodge, F.R.S 668 



Notes . 670 



Our Astronomical Column : — 



Approaching Return of Pons-Winnecke's Comet . . 674 



Stellar Parallaxes 674 



Catalogue of Novse .... 674 



Federal Science during the 'World-war : Geology 

 in Austria-Hungary in 1914-19. By Prof. Gren- 



ville A. J. Cole, F.R.S 675 



Measurements of the Angular Diameters of Stars. 



By A. C. D. C 676 



Culture and Environment in the Cameroons . . . 677 



The Science Masters' Association 677 



Research on the Pink Boll-worm 678 



The Optical Glass Industry 679 



Mineral Resources of the United States 679 



University and Educational Intelligence 679 



Calendar of Scientific Pioneers 68i 



Societies and Academies .... 68t 



Books Received 683 



Diary of Societies 683 



