2^2 



NATURE 



[October 13, 1921 



Tracts for Computers, No. 6. Smoothing. By E. C. 

 Rhodes. Pp. 60+3 diagrams. (London : Cambridge 

 University Press.) 35. gd. net. 



Map Projections. By A. R. Hinks. Second edition, 

 revised and enlarged. Pp. xii+158. (Cambridge: At 

 the University Press.) \2S. 6d. net. 



A Memoir of the Rt. Hon. Sir Edward Fry, G.C.B., 

 1827-1918. By Agnes Fry. Pp. 328. (London : 

 Oxford University Press.) 125, 6d. net. 



A Study of Mathematical Education, including the 

 Teaching of Arithmetic. By B. Branford. New 

 edition, enlarged and revised. Pp. xii+432. (Oxford : 

 Clarendon Press.) 75. 6d. net. 



Monographs on the Theory of Photography, from 

 the Research Laboratory of the Eastman Kodak Co. 

 No. I : The Silver Bromide Grain of Photographic 

 Emulsions. By A. P. H. Trivelli and S. E. Sheppard. 

 Pp. 143. (New York : D. van Nostrand Co. ; 

 Rochester, N.Y. : Eastman Kodak Co. ; London : 

 Kodak, Ltd.) 155. 



Diary of Societies. 



THURSDAY, October 13. 



^^'^^^''^'"'' Society (at Royal Sanitary Institute), at 6.— Dr. 

 C. W. Kimmins : Springs of Laughter. 



Opticai, SocrrTT (at Imperial College of Science), at 7.30.— Dr. C. 

 Sheard : Thomas Young "Dration. 



INSTITUTE OF Metals, London" Section- (at Sir .Tohn Cass Technical 

 Institute), at 8.— Dr. O. F. Hudson: Chairman's Address. 



Societt for Contstrtictive Birth CoNXROt an-d Racial Progress 

 an Lecture Room, Hotel Cecil), at 8.— Dr. Marie Stopes : Anec- 

 dotes of the Past, Present, and Future of Birth Control (Presi- 

 dential Address). 



Abehnethian Societt (at St. Bartholomew's Hospital), at 8.30.— 

 Dr. C. Addison : Medical Men and Public Life. 



EoiAL Societt or Medicine (Neurology Section), at 8.30.— P. 

 Sargent : Presidential Address. 



FRIDAY, October 14. 



Association of Economic Biologists (In Botanical Lecture 

 Theatre, Imperial College of Science), at 2.30.— Dr. W. Brown 

 and Others : Discussion on the Physiology of the Infection 

 Process. 



JcNiOR Institution of Engineers (Inc.), at 8.— C. H. Woodfleld : 

 Electric Cranes. 



RoTAt Society of Medicine (Ophthalmology Section), at 8.30.— 

 J. H. Parsons : The Fourth Cranial Nerve.— E. Clarke : Mile- 

 stones in Refraction Work. 



SATURDAY, October 15. 

 Phtsiological Society (at Guy's Hospital), at 4 p.m.— N. W. 

 MacKeith, M. S. Pembrey, W. R. Spurrell, E. C. Warner, and 

 H. J. W. J. Westlake : Changes in Urine and Respiration in 

 Relation to Exercise.— G. P. Crowden, Gwenda Hill, and M. 8. 

 Pembrey : Physiological and Anatomical Comparisons of a Pair 

 of Identical Twins.— E. D. Adrian and A. Forbes : The All-or- 

 Nothing Response of Sensory Nerve Fibres.— G. S. Adair, J. 

 Baroroft. and A. V. Bock : The Identity of Haemoglobin in 

 Human Beings.— M. Nagahashi : Magnetic' Gas Analysis.— J. C. 

 Drummond, G. P. Crowden, and Gwenda Hill : Nutrition on High 

 Protein Dietaries.— B. J. Collingwood : The Constitution of 

 Blood after the Intravenous Injection of (o) a Solution of 

 Thrombin, prepared by the Gamgee Method: and (ft) Tissue 

 Extract.— A. V. Hill and W. E. L. Brown : The Effect of CO2 

 on the Heat of Combination of Haemoglobin and Oxygen. — J. 

 Mellanby : Asphyxia by Nitrogen. 



TUESDAY, October 18 



Royal Horiictjlttiral Society, at .3.— N. H. Grubb : Some Aspects 

 of Apple Pruning. 



Rotal College of Physicians, at i. — Dr. H. R. Spencer : (Harveian 

 Oration). 



Zoological Society of London, at 5.30. — The Secretary : Report 

 on the Additions made to the Society's Menagerie during the 

 months of June, July, August, and September. 1921. — M. A. C. 

 Hinton : Exhibition of an Embryo Africp^ Elephant. — A.. Stanley 

 Hirst : On Some New Parasitic Mites. — Prot. J. Playfair McMur- 

 rich : Note aon the Systematic Position and Distribution of 

 Sagartia luciae. 



WEDNESDAY, October 19. 



Entomological Societt of London, at 8. 



Royal Microscopical Society, at 8. — Dr. L. T. Hogben : Preliminary 

 Account of the Spermatogenesis of Sphenodon. — D. M. Stump : 

 An Application of Polarised Light to Resolution with the Com- 

 pound Microscope. 



Institution- of Automobile Engineers (at Commercial Vehicle and 

 Motor Car and Marine Exhibitions, Olympia). — H. S. Hall and 

 H. G. Burford ; E. H. Arnott : Agricultural Tractors. 



THURSDAY, October 20. 

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



G. Brewer : The Langley Machine and the Hammondsport Trials. 

 Chemical Society, at 8.— R. L. Grant and F. L. Pyman : Nitro- 



and Amino-derivatives of 4-Phenylglyoxaline. 



Institution or Automobile Kngineers (at Commercial Vehicle and 



Motor Car and Marine Exhibitions, Olympia). — T. Clarkson : 



Coke as a Fuel for Commercial Vehicles. — W. D. Williamson : 



Loading Devices for Commercial Vehicles. 



FRIDAY, October 21. 



Institution of Mechanical Engineers, at 6. — Dr. W. Rosenhain, 

 8. L. Archbutt, and Dr. D. Hanson : Eleventh Report to the 

 Alloys Research Committee on Some Alloys of Aluminium. 



PUBLIC LECTURES. 



(.4. number in brackets indicateg the number of a lecture 

 in a course.) 



THURSDAY, October 13. 

 King's College, at 5.30.— H. W. Fitz-Simons : Bridge Construc- 

 tion (1). 

 University College, at 4.— Dr. T. G. Pinches : Babylonian 

 Magic (2). 



FRIDAY, October 14. 

 University College, at 4.30.— Dr. J. C. Drummond: Nutrition (1). 



SATURDAY, October 15. 

 Regent Street Polytechnic, at 10.30.— Prof. H. H. Turner : 

 Modern Astronomical Theories. 



MONDAY, October 17 

 King's College, at 5.30. — H. Moore: Liquid Fuels O) 

 University College, at 5. — Prof. G. Dawes Hicks : The Philo 

 sophical Aspects of the Theory of Relativity- 



TUESDAY, October 18. 

 King's College, at 5.30.— Prof . H. Wildon Carr : The Modern 

 Scientific Revolution and its Meaning for Philosophy (2).— The 

 Perceptual Basis of Phvsics.— Dr. W. Bro.vn : Psychology and 

 Psychotherapy (1).— L. J. Hunt: Cascade Synchronous Motors 

 and Generators (1). 



WEDNESDAY, October 19. 

 King's College, at 4.30.— Dr. C. Da Fano : Histology of the Ner- 

 vous System (2). 



CONTENTS. PAGE 



The Aeronautical Research Committee 201 



The Science of Pharmacognosy 203 



Human Physiology. By E. P. C 204 



Principles of Electrical Engineering. By A. R. . 205 



Semi-popular British Botany. By R, R. G. ... 205 



Our Bookshelf 206 



Letters to the Editor: — 



Occurrence of the Aurora Line in the Spectrum of the 

 Night Sky. — Right Hon. Lord Rayleigh, 



F R.S 208 



Atomic Structure — Prof N. Bohr 208 



The Separation of Chlorine into Isotopes. — Prof. 



William D. Harkins .... 209 

 The Pickering Series in O Type Stars.— H. H. 



Plaskett 209 



Radiation and Chemical Action.— T. W. J. Taylor 210 



Qualitiesof Valency.— Dr. R. M.-Caven .... 210 

 The Dushman Equation for the Velocity of a Mono- 

 molecular Reaction.— W. E. Garner . . .211 

 The Duration of Sunrise and Sunset. (JVi(k Dia- 

 gram.)— Dr. WillardJ. Fisher . . . . .211 

 Is Bisexuahty in Animals a Function of Motion?— 



G. C. Robson 212 



An Algebraical Identity.— R. F. Whitehead . • 212 

 Consciousness and the Unconscious. By Prof. 



C. Lloyd Morgan, LL.D., D.Sc, F.R.S 213 



The Age of the Earth 217 



The Constitution of Molecules .... 218 



The Study of Bird-migration by the Marking 



Method. By W. E. C 22c 



Obituary 221 



Notes 222 



Our Astronomical Column : — 



The Lunar Eclipse of Sunday, October 16 226 



Morning Stars ^2" 



Large Fireball 226 



The Australian National Research Council ... 227 

 Scottish Fisheries. By Prof. W. C. Mcintosh, 



F.R.S 228 



University and Educational Intelligence . . . . 229 



Calendar of Scientific Pioneers 230 



Societies and Academies 230 



Books Received 231 



Diary of Societies 232 



NO. 271 I, VOL. 108] 



