74« 



NATURE 



[February 3, 192 1 



BoviL SoiiETY OF .MKUiiiNi: ( Anrenthftics Section), at 8.30.— Drs. 



Howliiithnm and 1. .Mntiil ; .\np.'t.tlu'sia in the Plastic Surgery of 



tilt* i-'aee and Jaws. 

 KuiAi. l.^aiiruTios or Ouieat Britain, at 9. — Dr. A. U. Waller: The 



Elcotriol Kxpression of Human Emotion. 



SATVnVXY, FEimiiAKi 5. 



OiLBF.KT White Feixowship (at 6, Queen Square, W.C.I), at 3.— 

 Lecture. 



MOSliXY, FcBKiAur 7. 



A'ltrolMA l.vSTiTfTK (at Central Uuildinjis, WestminKter), at 4.30. — 

 Dr. .^. J. .McC. Routh : .Motlierhood. 



RorAl, l.vsTJTiTlos OF Ghkat BRITAIN, at h, — General lleeting. 



BoYAL COLLiiGE OF SiKOEONS OF KsGLAND, at 5. — Prof. H. Piatt: 

 Tile Surgery of the Peripheral Nerve Injuries of Warfare. 



SotiKTT OF h.voiNF.FBS (at Geological Society), at 5.30. — I^ord Head- 

 ley : Presidential AddroH. 



Aristotelian Socif.tv (at rniversity of London Club, 21 Gower 

 Street), at 8.— Prof. R. F. A. Hoernle ; Contributions to a Pheno- 

 menology of Meaning. 



SociETi or Chemical iNDtSTKr (London Section) (at Chemical 

 Society), at 8.— Dr. 0. Silberrad : The Erosion of Bronie Pro- 

 pellers. 



Suirt'EroBs' INSTITITION, at 8.— .A. H. Davis : The .\cquisition of 

 Ijand for Public Purposes in Egypt. 



RoTAL Geographical Societi (at .Eolian Hall), at 8.30. — Dr. J. M. 

 .Vrthur ; Mount Kenya. 



Medical Societt or London, at 9.— G. E. Gask : Surgery of the 

 Lung and Pleura (Lettsomian Lecture). 



TUESDAY, FEBEUABr 8. 



ilOIAL HOHTlCL'LirBAL SOCIETI, at 3. 



Institction or Civil Engineers, at 5.30. — G. EUson : Cannon 

 Street Bridge Strengthening. — F. W. A. Handman : Reconstruc- 

 tion of a Viaduct. 

 Zoological SotnEir or London, at 5.30.— Dr. P. Chalmers Mitchell : 

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

 the months of November and December, 1920. — Dr. V. F. Soantag : 

 1. The Comparative .Anatomy of the Tongues of the .Mammalia. 

 II., Fam. Simiida;. 2. .\ Contribution to the Anatomy of the 

 Three-toed Sloth [Uradyinu tridacti/tus). —I'rof. J. P. Hill: E.\- 

 hibition of, and Remarks upon, a Foetus of the Three-toed Sloth 

 {Uraili/pus tridaetylus).—^. I. Pocook ; Notes on the External 

 Anatomy of the Three-toed Sloth (Bradypug tridactylm) . — 

 Lieut. -Col. S. Monckton Copeman : Note on the Capture of a 

 Rare Parasitic Fly, Hammoinyia (Hytephila) uinlineata, Zett. — 

 D. M. S. Watson : The Basis of Classification of the Thcriodontia. 



BoiAL Photographic SociETr or Great Britain, at 7.— H. Davis: 

 A New .Method for the Measurement of Photographic Filter 

 Factors.— F. C. Toy : A Description of a Monochromatic Illu- 

 minator designed for a Special Purpose. — Dr. L. A. Levy and 

 T. Thorne Baker : High-speed Radiographv. 



QiEKETT .Microscopical Cub (at 11 Chandos Street, W.l), at 7.30.— 

 -Annual General iMeeting. 



HOTAL Society of Arts, at 8.— E. C. de Segundo : Some of the 

 Problems of Unemployment. 



Royal .Anthropological Institute, at 8.15.— Prof . A. Keith : Tailed 

 Men. 



Roial Societt or Medicine (Psyohiatrv Section), at 8.30.— Dr. 

 W. A. Potts: Mental Tests. 



V/EBNESBAY, Fbbeuart 9. 



Royal College of Surgeons of England, at 5. — Prof. H. Piatt: 

 The Surgery of the Peripheral Nerv? Injuries of Warfare. 



HoYAL Society or Medicine (Surgery : Proctology Sub-section), at 

 5.30. — W. B. Gabriel : The Results of an Experimental and Histo- 

 logical Investigation into Seventy-five Oases of Rectal Fistulse.- 

 H. Graeme Anderson : ^lethod of Abdomino-perineal Excision of 

 the Rectum in Three Stages. 



I.VSTITUTION OF ClviL ENGINEERS (Studcuts' Meeting), at 6.— J. H. 

 Barker : Machinery .\pplied to Mass Production. 



Royal Society of Arts, at 8.— Prof. W. Kothenstein : Possibilities 

 for the Improvement of Industrial .\rt in England. 



Institution of .Automobile Engineers (at Institution of Mechanical 

 Engineers), at 8. 



I.VSTITUTION OF .AUTOMOBILE ENGINEERS (Graduates' Meeting) (at 

 28 Victoria Street), at 8. 



THURSDAY, February 10. 



Royal Institution of Great Britain, at 3. — Prof. W. A. Herdman : 

 Oceanography (Problems of the Plankton). 



Royal Society, at 4.30.— Rev. John Roscoe : A RHuml of the Re- 

 sults obtained by the Mackie Anthropological Expedition to 

 Uganda. 



London SIathematical Societi (at Royal Astronomical Society), at 

 5. — Prof. .4. S. Eddington ; World Geometry (Lecture). 



Institution of Electrical Engineers (at Institution of Civil 

 Engineers), at 6. — Discussion on Electric Appliances for Domestic 

 Purposes, to be introduced by Dr. E. Griffiths and F. H. Schofield 

 in a Paper on Some Thermal Characteristics of Electric Ovens 

 and Hot Plates. 



Optical Society, at 7.30.— R. S. Whipple : The Design and Con- 

 struction of Scientific Instruments. — T. Smith : The Galilean 

 Binocular. — R. J. Trump : A Shutterless Continuous-feed Kine- 

 matograph. 



Royal Society of AIedicine (Neurology Section) (at National Hos- 

 pital for Paralysis and Epilepsy), at 8. 



FRIDAY. Februart 11. 

 Gilbert White Fellowship. — Founders' Day Celebrations. 

 Royal Astronomical Society (Anniversary Meeting), at 5. 



NO. 2675, VOL. 106] 



KoiAL SocinT or .VIidicinc (Clinical Medicine, Surgrrr), Joint 

 Meeting, at 5.— Dr. H. Mackeniie, J. Berry, and Uthcri> : Ui» 

 cushion : The -Medical and Surgical Treatment of Graves' Diiteaw, 



Roial uoLLtoE or suiiuiions or Knglahd, at 5.— Prof. A. O. T. 

 Fisher : Loose Uudiee in Jointn. 



Physical Society or London (at lmiM.>rift] College of Science), at 

 5.15.— Discussion on .Absolute .Measurements of Electrical Resist' 

 ance, and Instruments Based on the Temperature-variation of 

 Ilesistance.— Sir Richard Olaiebrook and F. K. Smith: Absolut* 

 .Measurements of Electrical Resistance.— Resistance Thermometry : 

 Prof. H. L. Callendnr : The Compensated ResiBtance Bridge, and 

 Instrument for the Measurement of Radiation.— ('. R. Darling : 

 The Early Work of Siemens on the Resistance-Pyrometer. — 

 C. Jakeman : The Measurement of Steam Temjieratures.— The 

 Hot-wire Microphone: Major W. 8. Tucker; The Function of 

 the Convection Current in the Hot-Wire Microphone. — Capt. 

 E. J. Paris: Theory of the Tucker Microphone.— Anemometrr 

 and Heat Convection : Prof. J. T. McGregor Morris : A Hot-Wire 

 Anemometer.— Dr. J. S. G. Thomas . A Directional Hot-Wire 

 Anemometer. — A. H. Davis : An Instrument for Measuring Con- 

 vected Heat. — Miscellaneous Applications : Dr. G. A. Shakspear : 

 A Gas Permeameter.— Prof. Leonard Hill : The Caleometer.— 

 E. A. Griffiths: Liouid Depth Gauge (Distant Reading Type).— 

 Dr. Davnes : A COt Recorder.— Dr. E. Griffiths : Electrical 

 Hvgrometers. 



Montf.ssori Societt (at University College), at 5.45. — Miss M. 

 Drummond : The Psvchological Basis of the Vnntessori Method. 



Royal Society of Medicine (Ophthalmologv Section*, at R..30. — B. T. 

 T.ang: Seotometrv.— uir. T. H. Butler: Late Infections after 

 Solerectoitiv.— M. L. Hepburn : Some Notes on Trenhining. 



Royal Institution of Grfjit Britain, at !).— Dr. F. W. Aston : 

 Isotopes and .Atomic Weights. 



SATURDAY. Februaei 12. 

 Royal Institution of Great Britain, at 3.— Prof. A. Fowler : 



Snectroscopv (Experimental Spectroscopy). 

 Physiological Society (at National Institute for Medical Research, 



Mount Vernon. Hampstead). at 4. 



CONTENTS. 



By Dr. W. Bateson, 



PAGE 

 717 



Anthropology and Emp're 

 The Determination of Sex. 



F.R S. . 719 



Anaesthetics • 7^1 



Mathematical Text-hooks . . 722 



Our Bookshelf 7^3 



Letters to the Editor: — 



The Arrangement of Atoms in Crystals. — Prof. 



W. L. Bragg 7^5 



A Case of Coloured Thinking with Thoughf-forms 

 and linked Sensations. (With Diagrams.) — 

 Prof. D. Fraser Harris . .725 



Heredity and Acquired Characters. — Sir G. Archdall 



Reid, K.B.E .726 



Man and ihe Scottish Fauna. — Dr. James Ritchie ; 



The Reviewer 727 



Literature for Men of Letters and Science in Russia. 



— L F. Schuster 728 



The Mild Weather.— H. Stuart Thompson ... 728 

 The Forest Resources of India. [Illustrated.') . . . 729 

 The Investigation of Gravity at Sea. By Prof. 



W. G. Duffield 73* 



Obituary : — 



Prof. H. A. Bumstead. ByJ.J. T 734 



Prince P. A. Kropotkin 735 



Notes 736 



Our Astronomical Column: — 



Planets now Visible 74° 



The Diameters of Stars 74° 



Minor Planets 74° 



The London School of Tropical Medicine. (Illtis- 



traled.) 74.1 



New Experiments on the Inheritance of Somato- 

 genic Modifications. By Prof. Arthur Dendy, 



F.R.S 742 



The Planet Mars. By A. C. D. C 743 



Land Reclamation 743 



University and Educational Intelligence 744 



Calendar of Scientific Pioneers 745 



Societies and Academies , 746 



Books Received 747 



Diary of Societies 747 



