592 



NATURE 



[December 29, 192 1 



University Collejfe), at 5. — Miss Lucy G. Fildes : The Training 

 of Teachers for Mentally Defective and Backward Children, and 

 Special Methods of Teaching. 

 Mathematicai- Association (at London Day Training- College), at 

 5.30. — Sir Georg-e Greenhill : Jlathematies in Artillery. 



TVESDAY, Jani'art 3. 



5[athkmaiicai. Association (at London Day Training College), at 

 10 a.m. — Dr. J. W. Nicholson : The Structure of the Atom.— 

 I'rof. C. Godfrey : Vectors.— Miss F. A. Yeldham : The Daltou 

 Plan and the Teaching of Mathematics. 



SciKNCK Mastkks' ASSOCIATION (at Imperial College of Science and 

 Technology), at \\ a.m. — The Master of Balliol : Science and His- 

 tory (Presidential Address): at 12. — T. J. Gardner and others: 

 Discussion : The Teaching of Mechanics. 



Association of Sciknce Tf.achf.ks (at University College), at 2.30.— 

 Dr. Winifred Brenchlev : The Effects of Competition on Plant 

 Life. 



Mathematical Assochtion (at London Day Training College), at 

 2.30.— Prof. G. H. • Hardv : The Late "Srinivasa Ramanujan. — 

 K. Dakin and others : Discussion : That Pure and Applied 

 ^[athematies ought to be Taught and Developed ytari passu in 

 Boys' Secondary Schools. — Rev. E. M. Radford and others : Dis- 

 cussion : How to Keep Teachers of Mathematics in Touch 

 with Afodern Developments and Methods. 



RoTAT. INSTITITION. at 3.^— Prof. J. A. Fleming: Electric Waves 

 and Wireless Telephony : The Telephone. 



SciF,NCE JIastebs' ASSOCIATION (at Imperial College of Science and 

 Technology), at 3. — D. Berridge and others: Discussion: The 

 Tenehina' of Geography in Relation to Science. 



•School N.^tire-Stidt Union (at University College), at 3. — Dr. 

 E. .T. Russell : The .Soil and Plant Growth. 



EroENics Edvcation Society (at University College), at 5. — AV. 

 Hope-Jones : A Eugenie View of Education. 



Health. irATEUNiTY. . and Child Welfare LF»GrE (at University 

 College), at ,5.— Special Diseases and Disabilities of Adolescence: 

 at 6.— Dr. C. W. Saleeby ; The Social Problem of the Adolescent. 



RovAL Photographic Society of Great Britain, at 7. — Lecture. 



}YEDyESDAY, Jantary 4. 



Science ^Masters' Association (at Imperial College of Science and 

 Technology), at 12.— Brig.-Gen. H. B. Hartley and others; Dis- 

 cussion: Physical Chemistry in Schools; at 3. — Ma^or E. R. 

 ''"Iionias and others : Discussion : Post-certiiTcate Science for 

 Non-specialists. 



Society fob Experiment and Rf.sf.ahch in Edttcation (at University 

 College), at 3.— Prof. H. Laski : The Needs of the Modern 

 University. 



Physical .Society and Optical Society (at Imperial College of 

 Scirnee and Technology), at 4. — A.. A. Campbell Swinton : The 

 .Tohnscn-Rahbek Electrostatic Telephone and its Predecessors. 



Child-Sttpy Society (at University College), at 5. — Dr. Rusk: The 

 Supernormal Child. ^ 



Health. ^Iatf.rnity. and Child Welfare Lfagce (at University 

 College), at r>. — ^Athleticism and .adolescence. 



Gkolocical Society of London, at H.^O. — Dr. W. D. Lang, Dr. 

 L. F. Spath, and W. A. Richardson : Shales-with-Beef, a Sequence 

 in the Lower Lias of the Dorset Coast. 



Royal Society of ^rEDiciNE (Surgery Section), at 5.30. — Lock- 

 hart flummery and others : Discussion : Pulmonary Infaration 

 following Operations. 



Health. jMaternity. and Child Welfare Leac. ce (at L'niversity 

 Colles-e), at 6. — ^liss Norah March: Sex Instruction of the 

 .\dolescent. 



Institition- of Electrical Engineers (Wireless Section), at 6. — 

 Lt.-Col. A. G. T. Cusins : High-speed Wireless Telegraphy. 



Physical Society and Optical Society (at Imperial College of 

 SciePfP and Technology^, at 8.— F. H. Glew : Radium: Its 

 Application in Peace and War. 



THURSDAY. Janiaby 5. 



Geographical Association (at Birkbeck College), at 11.45 a.m. — 

 R. L. Thompson and others : Discussion : Geography and His- 

 tory in Schools. 



Association of .Assist.4nt Masters in Secondary Schools (at 

 London Day Training College), at 2.30.— Prof. T. P. Nunn : The 

 Purposes of Education. 



Geographical Associ.ation (at Birkbeck Colles'e), at 2.30. — Sir Hal- 

 ford .T. Mackinder : Problems of the Pacific. 



Royal Institction. at 3. — Prof. ,1. A. Fleming: Electric Waves 

 and Wireless Telephony : Electric Oscillations. 



Geographical Association (at Birkbeck College), at 4. — E. N. 

 Fallaize : The Anthro])ological Institute and the Services it can 

 render to Geographical Students. 



Central .\ssociation for the Care of the ^Ientally Defective (at 

 University College), at 5. — Dr. G. A. Auden : The Possibility of 

 Co-operation between the School ^fedieal Officer and the Teacher 

 in the Trainina- of Subnormal and Mentally Defective Children. 



London Head Teachers' Association (at University College), at 

 5 30.— D. .J. Collar and T. O. Tibbey : Intelligence Tests in 

 Schools. 



Royal .\EROXArTiCAL Society (at Royal Society of Arts), at 5.30. — 

 Wing-Cmdr. W. D. Beatty : Specialised Aircraft. 



Gfographical .Association (at Birkbeck College), at 5.45. — Lord 

 Robert Cecil : Presidential Address. 



Institition of Electrical Engineers, %t 6. — Dr. S. P. Smith : 

 Single and Three-phase Commutator Motors with Shunt and 

 Series Characteristics. 



Physical Society and Optical Society (at Imperial College of 



Science and Technology), at 8. — A. A. Campbell Swinton: The 

 Johnsen-Rahbek Electrostatic Telephone and its Predcoessors. 



FRIDAY, Jancari 6. 



Geographical Associ.ation (at King's College), at 10.20 a.m. — Dr. 

 Fleure : The Co-operation of Historians and Geographers. 



Geographical As.sociation (at Birkbeck College;, at 3. — Miss L. 

 Winchester : Some Climate Problems of Modern Palestine. 



Royal Geographical Society (Christmas Lectures to Young People) 

 (at .liolian Hall), at 3.30.— Sir Francis Younghusband : Pictures 

 from Jlount Everest. 



Geographical .Association (at Birkbeck College), at 4. — Dr. 

 Hogarth : The Hedjaz. 



Institition of JIechanical Engineers (Joint Meeting with the 

 .Society of Chemical Industry*, at 6.— G. M. Gill: The Co-opera- 

 tion of the Engineer and Chemist in the Control of Plants 

 and Processes. 



SATURDAY, January 7. 



College of Preceptors, at 1130 a.m.— Prof. J. Adams: Psycho- 

 analysis and its Value and Limitations from the Standpoint 

 of the Practical Teacher. 



Royal Institi tion, at 3.— Prof. J. A. Fleming : Electric Waves 

 and Wireless Telephony : Electric Waves. 



Gilbert White Fellowship (at fi Queen Square, W.C.I), at 3 — 

 E. Kav Robinson : British Wild Life. 



CONTENTS. PAGE 



Smoke Abatement 557 



Christian Theism. By The Rev. Dr. F. R. Tennant 559 

 Domestic Heating and Waste of Coal and Health. 



By L. H 560 



Metallurgical Principles and Processes. By Prof. 



C. H. Desch 5^2 



Our Bookshelf . . 5^3 



Letters to the Editor:— 



The Accessory Nature of many Structures and Habits 



Associated with Courtship.— Julian S. Huxley . 565 

 Terrestrial Magnetic Disturbances and Sun-spots. — 



J. Evershed, F.R.S . . 566 



Microscope Illumination and Fatigue. — J. E. 



Barnard 5^6 



Prismatic Structure in Optical Glass. {Illustrated.)— 



Dr James Weir French 5^7 



The Calendar of Scientific Pioneers. — Eng.-Comdr. 



Edear C. Smith, R.N 5^7 



The Electric Telegraph. —J. C Carter; The 



Writer of the Note 568 



The Hydrogen-ion Concentration of the Soil in 

 Relation to Animal Distribution.— Dr. W. R. G. 



Atkins 568 



Relativity and Materialism.- Dr. Harold Jeffreys ; 



S. V. Ramamurty; Dr. Norman R. Campbell 568 

 The Resonance Theory of Hearing. — Dr. W. 



Perrett S^9 



Next Year's Total Solar Eclipse (September 21, 

 1922). {With Diagram.) By Major William J. S. 

 Lockyer . • • .• ... 57° 



Spontaneous Combustion of Coal in Mmes . . . 57^ 

 Countries as Personalities. By Prof. H. J. Fleure 573 



Obituary • • 575 



Notes 570 



Our Astronomical Column : — 



The January Meteors . . 58o 



The Furthest Cluster . ..... -••.•■• ^^° 



Prize Awards of the Paris Academy of Sciences 



for 1921 .• : 581 



Anthropology at the British Association ..... 5S2 

 Valency Bonds and the Mechanism of Organic 



Reactions. By H. M. D. . ... • • • 584 



Agriculture in the Maryut District, West of 



Alexandria . ... S^S 



Fisheries Biology. By J. J. •.;■••. • ' x, ' ^^ 

 The Need for Research in Colloid Chemistry. By 



William Clayton . • • A ; " * ' ^ 



Orientation in Egypt. By Col. H. G. Lyons, 



p Ij g _ loj 



Experiments on Plague Eradication in India 587 

 The Carbonisation of Peat in Vertical Gas 



Retorts. By J. W. C. ... . . 588 



University and Educational Intelligence . . ^o 



Calendar of Scientific Pioneers 5^9 



Societies and Academies S^ 



Diary of Societies '59 



NO. 2722, VOL. 108] 



