480 



NATURE 



[June 9, 192 1 



Diary of Societies. 



TUUnSBAY, SviiL 9. 



Institciion of Mining Engineers (at Geological Society), at 11. — 

 Third lleport of the Committee on " The Control of Atmospheric 

 Conditions in Hot and Deep Mines." — J. P. Rees : Observations 

 of Temperature and Moisture in Deep Coal-mines. — Prof. H. 

 Briggs : Characteristics of Outbursts of Qas in Mines. — H. 0. 

 Harrison : The Use and Distribution of Shale-dust in Mines. 

 The following papers, which have already appeared in the 

 Transactions, will be discussed :— A. E. Beet and A. E. Pindley : 

 The Better Utilisation of Coking Slack.— J. I. Graham : The 

 Normal Occurrence of Carbon Monoxide in Coal-mines. — T. L. 

 Galloway : An Improved Method of Determining the Belative 

 Directions of Two Reference-lines or Bases for Mining Surveys. 

 — E. Bury, \V. Broadbridge, and A. Hutchinson : Froth Flotation 

 as Applied to the Washing of Industrial Coal. 



Institute of Pathology and Research (at St. Mary's Hospital), at 

 4.30.— Dr. H. Head : Release of Function in the Nervous System. 



BOTAL SociETi, at 4.30.— Prof . C. S. Sherrington : Break- 

 shock Reflexes and " Supramaximal " Contraction-response 

 of Mammalian Nerve-muscle to Single-shook Stimuli. — R. J. Lud- 

 ford and J. B. Gatenby : Dictyokinesis in Germ Cells, or the 

 Distribution of the Golgi Apparatus during Cell Division. — Dr. 

 F. W. Edridge-Green : The Effect of Red Fatigue on the White 

 Equation.— E. Ponder : A Method for Investigating the Hsemolytic 

 Activity of Chemical Substances.— W. H. Pearsall : The Develop- 

 ment of Tegetation in the English Lakes, considered in Relation 

 to the General Evolution of Glacial Lakes and Rock Basins. ^ 



TjONDON Mathematical Societt (at Royal Astronomical Society), 

 at 5.— M. J. Conran : Curvature and Torsion in Elliptic Space. — 

 J. L. S. Hatton : The Inscribed, Circumscribed, and Self- 

 conjugate Polygons of Two Conies. — M. J. M. Hill : The 

 Differential Equations of the First Order derivable from an 

 Irreducible Algebraic Primitive.— F. S. Macaulay : Note on the 

 Resultant of a Number of Polynomials of the Same Degree. — 

 Lt.-Col. A. Cunningham: The Congruence 2''"''e0 (mod p').— 

 T. Stuart : Diophantine Equations. — G. H. Hardy : A Chapter 

 from Bamanujan's Note-book. 



RoiAL College of Phtsicians of London, at 5. — Dr. F. L. Golla : 

 The Objective Study of Neurosis (Croonian Lecture). 



BoiAL Institite of British Architects, at 5.— H. 8. Goodhart- 

 Rendel : Some Fashions in Architecture. 



Optical Society (at Imperial College of Science), at 7.30.— H. Lee : 

 Achromatism. — W. L. Custance : Demonstration of the Soci^t^ 

 Genevoise Universal Measuring Machine. 



Paint and Varnish Societt (at St. Bride's Institute), at 7.30. — 

 0. A. Klein : The Need for Science and Common Sense in the 

 Practical Testing of Paints. 



FRIDAY, June 10. 



Rotal Societt of Arts (Jndian Section), at 4.30. — Sir George 

 Curtis : The Development of Bombay. 



BoYAL Astronomical Societt, at 5. — Rev. J. G. Hagen : The Origin 

 of Temporary Stars and of Planetary Nebulae. — S. D. Tsoherny : 

 Results of Observations of Sun-spots and Faculae, 1916-1920, made 

 at the Observatory, Rostow-on-Don. — A. A. Rambaut : Parallaxes 

 of 51fi Stars, from Photographs taken at the Radcliffe Observa- 

 tory, Oxford.- E. A. Milne : Radiative Equilibrium : The Effect of 

 a Strong Absorption Line. — AV. M. Smart : Proper Motions of 

 Stars in the Pleiades.— Rev. A. L. Cortie : The Sun-spot Group and 

 the Magnetic Disturbances, 1921 May 8-21.— F. Sargent: Remark- 

 able Spot on the South Equatorial Belt of Jupiter.— Rev. 

 T. E. R. Phillips : Micrometrical Measures of Double Stars. — 

 Royal Observatory, Greenwich : Note on the Measurement of 



■ Groups of Sun-spots. — Roval Observatory, Greenwich : Observa- 

 tions of Comets a 1921 (Reid) ; 6 1921 (Pons-Winnecke) ; c 1921 

 (Dubiago). 



Physical Society of London (at Imperial College of Science), 

 at 5.— Sir Ernest Rutherford : The Stability of Atoms (Lecture). 



Royal Institution of Great Britain, at 9. — Dr. A. G. Webster : 

 Absolute Measurements of Sound. 



TUESDAY, JrNE 14. 

 Royal College of Physicians op London, at 5. — Dr. F. L. Golla : 

 The Objective Study of Neurosis (Croonian Lecture). 



WEDNESDAY, June 15. 



Royal Mf.teohological Society, at 5. — G. M. B. Dobson : Causes of 

 Frrors in Forecasting Pressure Gradients and Wind. — R. F. 

 Granger : The Physical Structure of Cloud-Form in the Lower 

 Atmosphere.— N. A. Cpmissopulos and J. Wadsworth : Variability 

 of Temperature over North America and Europe during the 

 Ten Tears. 1900-1909. 



Royal ;Mtchoscopical Society, at 8.— Prof. F. J. Cheshire : A Selection 

 from the Abbe Letters. — Dr. C. F. Sonntag : Some Points in 

 the Histology of the Three-Toed Sloth.— F. Chapman : Ostracoda, 

 Foraminifera, and Some Organisms related to Calcisphaerae, from 

 the Devonian of Germany .^G. T. Harris : Note on Mounting in 

 Glycerine Jelly. 



THURSDAY, June 16. 



Institute of Pathology and Research (at St. Mary's Hospital), 

 at 4.30. — Prof. W. Bulloch : Use and Abuse of Scientific Medical 

 Literature. 



Royal Society, at 4.30.— Prnbahle Paper*.— Prof. H. B. Dixon, Dr. 

 C. Campbell, and Dr. A. Parker : The Velocity of Sound in Gases 

 at Hieh Temperatures, and the Ratio of the Sneoiflc Heats. — 

 Prof. J. R. Partington : The Ratio of the Specific Heats of Air and 

 of Carbon Dioxide.— Dr. A. B. Wood and Dr. P. B. Young : 

 " Light Body " Hydrophones and the Directional Properties of 

 "Microphones.- Dr. A. B. Wood and Dr. F. B. Young : The Acous- 



tic Disturbances produced by Small Bodies in Plane Waves 

 transmitted through Water, with Special Reference to the Single 

 Plate Direction Finder. — M. A. Giblett : Some Problems connected 

 with Evaporation from Large Expanses of Water. — F. C. Toy : 

 The Photographic Efficiency of Heterogeneous Light. 



LiNNEAN Society, at 5. 



Royal College of Physicians of London, at 5. — Dr. F. L. Golla: 

 The Objective Study of Neurosis (Crooaian Lecture). 



Chemical Society (at Institution of Mechanical Engineers), at 

 8. — Prof. B. Moore : The Natural Photo-synthetic Processes on 

 Land and in Sea and Air, and their Relation to the Origin 

 and Preservation of Life upon the Earth (Hugo Miiller Lec- 

 ture). 



RdNTGEN Society (at University College), at 8.15. 



Royal Photographic Society of Great Britain, at 8.15. — Lec- 

 ture. 



Royal Society of Medicine (General Meeting), at 8.30.— Sir Thomas 

 Horder, Dr. A. F. Hurst, Sir Berkeley Moynihan, Sir Humphry 

 Rollestpn, ^ and Others: The Problem of the Private Clinic 

 System in Great Britain. 



FRIDAY, JtJWB 17. 



Royal Astronomical Society, Geophysical Discussion, at 5. — 

 Changes of Level in the British Isles, opened by H. L. P. Jolly, 

 followed by Col. Sir C. P. Close and O. G. 8. Crawford. Chair- 

 man : Col. Sir G. Lenox-Conyngham. 



Royal Photographic Society of Great Britain, at 8. — J. C. 

 Warburg : Foregrounds. 



West London Medico-Chieurgical Society (at Kensington Town 

 Hall), at 8.15.— Dr. C. Addison: The Part of the State in the 

 Prevention of Disease (Cavendish Lecture). 



Royal Institution of Great Britain, at 9. — Sir J. J. Thomson: 

 Chemical Combination and the Structure of the Molecule. 



CONTENTS. PAGE 



Co-operative Indexing of Periodical Literature . . 449 

 Piezo-chemistry. By Sir T. E. Tfcorpe, C.B., 



F.R.S. . . . . .450 



Social Degeneration. By The Very Rev. Dr. 



W. R. Inge 452 



X-rays in Medical Practice 454 



Our Bookshelf 455 



Letters to the Editor: — 



Phenomena of "Intelligence" in the Protozoa. — 



Edward Heron- Allen, F.R S 456 



An Algebraical Identity 4X = Y^ - 37Z2. _ Prof. 



G. B. Mathews, F.R.S. 456 



Atmospheric Refraction, {//htsirafed.) — A. Mallock, 



F.R.S ... 456 



Young's Interference Experiment and the Spectro- 

 meter. — Prof. John K. Robertson . 457 

 The Reparation Act and Scientific Research. — The 



Hon H. Onslow ... 457 



British Laboratory Ware and Chemicals. — Prof J. R. 



Partington and C. L. Bryant 457 



Science and Technology in Palestine. — Daisy L. 



Adler ... 458 



Foreign Scientific Literature. — Hugh Richardson . 458 

 Flint Implements in the Cromer Forest Bed. — ^J. Reid 



Moir 458 



The Physical Status of " Space." — L. C. W. 



Bonacina 459 



The Colours of Primrose.'!. — Frank H. Perrycoste . 459 

 Gold-coloured Teeth of Sheep. — W. J. Lewis 



Abbott . . 4^9 



Prehistoric Art in Caves and Rock-shelters. (Illus- 

 trated.) By M. C. Burkitt 460 



Dark Nebulae, {llhistratel.) By Dr. A. C. D. 



Crommelin 464 



Obituary: — 



Prof. E. B. Rosa 465 



Notes ... .... 466 



Our Astronomical Column : — 



Comets . 471 



Nova Cygni III. (1920) 471 



Collision of Star and Nebula . . 471 



The Edinburgh Meeting of the British Association 472 

 The Royal Observatory, Greenwich. By A. C. D. C. 472 

 The Chinese Earthquake of December 16, 1920. By 



Dr. C. Davison . . 473 



Stereochemistry. By J. B. C. 474 



University and Educational Intelligence . ... 474 



Calendar of Scientific Pioneers 476 



Societies and Academies 476 



Books Received 479 



Diary of Societies 480 



NO. 2693, VOL. TO7] 



