224 



NATURE 



[April i\, 192 1 



BoiAL SIAIISTIC4L SociETX (at Surveyors' Institution), at 5.15. — 

 B. J. A. Pearson : A Comparison of Pre-war and Post-war Pro- 

 duction Costs in Engineering. — N. Crump : A Review of Becent 

 Foreign Exchange Eluctuations. 



IxsTiTUHON OF CiviL En&ineehs, at 5.30. — Sir Murdoch Macdonald 

 and H. E. Hurst : The Measurement of the Discharge of the 

 Nile through the Sluices of the Assuan Dam 



Institution of Petroleum Technologists (at Boyal Society of 

 iis), at 5.30. — A. W. Davson : Education and Training of a 

 Driller. 



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

 the Additions to the Society's Menagerie during the Month of 

 March, 1921.^Mrs. J. Longstaff : Observations on the Habits of 

 the Snail, Cochlitoma zebra, var. fulgurnta, and Cochlitoma zebra, 

 var. obesa, Pfeiffer, in Confinement. — B. 1. Pocock : The Ex- 

 ternal Character^ and Classification of the Procyonida; (Baccoons, 

 etc.). — M. A. Smith: New or Little-known Beptiles and 

 Batraohians from Southern Annam (Indo-China). 



Royal Photographic Society of Great Beitain, at 7. — A. Pereira : 

 i'rom Camera to Cinema : The Printing of a Film. 



Royal Anthuopological Institute, at 8.15. — S. H. Warren : Report 

 en Excavations at the Stone Axe Factory of Graig-lwyd in 1920. 



Royal Society of Medicine (Pathology Section) (Annual General 

 Meeting), at 8.30. — Sir Lenthal Cheatle : Parenchymatous Inflam- 

 mation of the Breast.— A. T. Glenny, Miss K. Allen, and Dr. 

 R. A. O'Brien. — (1) Schick Reaction ; (2) Diphtheria Prophylactic 

 Immunisation with Toxin Anti-toxin Mixture.— Dr. E. H. Kettle 

 and D1-. Joan Ross : Study of the Endotheliomata. 



WEDyeSDAY, Apkil 20. 



Society of Glass Technology (Annual General Meeting) (at Uni- 

 versity College), at 2.30. — Presidential Address.— G. Bowse and 

 E. Meigh : Automatic Glass Feeding Devices. 



Royal jMeteokological Society, at 5. — 0. E. P. Brooks : The Evolu- 

 tion of Climate in North-West Europe. — Lieut. G. C. Steele : 

 Discussion on A Brief Review of the Influence of Meteorology on 

 Naval Warfare. 



Royal Society of Medicine (History of Medicine Section), at 5. — 

 Dr. T. Wilson Parry : The Prehistoric Trephined Skulls of Great 

 Britain, with Description of Operations Performed. — Dr. F. G. 

 Chandler : The History of the Diagnosis and Treatment of 

 Empyema. 



Geological Society of London, at 5.30.— J. A. Douglas : Geological 

 Sections through the Andes of Peru and Bolivia; III. From 

 Callao to the River Perene.— Prof. O. T. Jones : The Valentian 

 Series. 



Royal Society of Abts, at 8.— Sir James Cantlie : (1) Thomson's 

 Apparatus for Armless Men. (2) X-ray Motor Ambulance Service 

 for the United Kingdom. 



EoYAL Micboscopical Society, at 8.— Rev. J. S. Pratt : Mr. Fred. 

 Enock's Method of Mounting Heads of Insects without Pressure. — 

 P. Martin Duncan : The Presence of Two Spermathecse in the 

 Rare Mole Flea (Hystrichopsylla talpae), and the Plea as a Dis- 

 tributor of a Tyroglyphid.— H. Crowther : A Coal-dust Explosion 

 as Seen through the Microscope. — Capt. P. Oppenheimer : Some 

 Suggestions regarding the Mechanical Design of Microscopes. 

 THURSDAY, April 21. 



Boyal Institution of Great Britain, at 3. — Prof. H. S. Foxwell : 

 Nationalisation and Bureaucracy. 



Boyal Society, at iM.— Probable Papers.— Vrot. J. Joly : A Quan- 

 tum i'heory of Colour Vision. — Prof. A. V. Hill : The Energy 

 involved in the Electric Change in Muscle and Nerve. — H. M. 

 Kyle : The Asymmetry, Aletamorphosis, and Origin of Flat 

 Fishes.— T. L. Prankerd : Studies in the Cytology of the Statolith 

 Apparatus in Plants, viewed in Belation to their Habit and 

 Biological Bequirements. 



Royal society of Medicine (Dermatology Section), at 6. 



LixNEAN Society, at 5.— Prof. K. Newstead : Some Observations on 

 the Natural History of the Upper Shiri River, Nyasaland. 



London 3Iathematical Society (at Boyal Astronomical Society), 

 at 5. 



Institution of Mining and Metallurgy (Annual General Meeting) 

 (at Geological Society), at 5.30.— P. W. Harbord : Presidential 

 Address. 



Child-Study Society (at Boyal Sanitary Institute), at 6.— Dr. 

 J. E. Borland: The Musical Training of Children. 



The Chemical Society, at 8.— F. Challenger and C. P. Allpress : 

 Organo-derivatives of Bismuth. Part iv. : The Interaction of 

 the Halogen Derivatives of Tertiary Aromatic Bismuthines with 

 Organo-derivatives of Magnesium and Mercury. — J. A. N. Friend : 

 A Colloid Theory of the Corrosion and Passivity of Iron and 

 of the Oxidation of Ferrous Salts. — G. T. Morgan and J. D. 

 Smith : Eesearches on Co-ordination and Besidual Affinity. 

 Part iv. : The Constitution of Simple and Complex Cobaltio 

 Quinoneoxime Lakes.— G. T. Morgan and H. Burgess : Non- 

 aromatic Diazonium Salts. Part vi. : 3 : 5-Dimetliyh'sooxazole-4- 

 diazonium Salts and their Azo-derivatives. — E. de B. Barnett and 

 J. W. Cook: Studies in the Anthracene Series. Part i. — J. B. 

 Firth : Some Factors governing the Sorptive Capacity of Char- 

 coal. Sorption of Ammonia by Coconut Charcoal.- — N. V. Sidg- 

 wick and E. K. Ewbank : The Influence of Position on the 

 Solubilitiea of the Substituted Benzoic Acids. — N. V. Sidgwick 

 and W. M. Aldous : Influence of Position on the Solubility and 

 Volatility of the Mono- and Di-nitrophenols.— N. V. Sidgwick and 

 H. E. Bubie : The Solubility and Volatility of the Ohloro- and 

 Nitro-anilines and their Acetyl Derivatives. — G. A. R. Kon : The 

 Formation and Stability of spiro-Compounds. Part iv. : The 

 Formation of Ketones derived from Open-chain and Cyclic GIu- 

 taric Acids by the Thermal Decomposition of their Calcium Salts. 

 — W. J_. Jenkins : Interaction of Acetylene and Mercuric Chloride. 

 Part ii. — J. Bead and H. G. Smith: Researohes on Piperitone. 

 Part i. : The Occurrence, Isolation, and Characterisation of 

 Piperitone. 



Institute of Metals (at Sir John Cass Technical Institute), at 8. — 

 1)1. \\. B. Ormandy : Befraotories. 



BoXTGEN Society (at University College), at 8.15. — Prof. A. M. 

 Tynclall and E. G. Hill : A New Form of Stereo-fluoroscope. — 

 Descriptions and Demonstrations of New X-ray, Electrical, and 

 Photographic Apparatus. 



FRIDAY, April 22. 



Association of Economic Biologists (in Botanical Lecture Theatre, 

 Imperial College of Science), at 2.30. — W. A. Millard : Green 

 Plant Matter as a "Decoy" for Actinomycetes Scabies in the 

 Soil. — E. H. Eichards : The Action of Bacteria and Protozoa in 

 Conserving the Nitrogen in Sewage. — G. P. Wiltshire :' The 

 Methods of Infection of the Apple Canker Fungus. 



Boyal Society of Arts (Indian Section), at 4.30. — Lt.-Col. Sir 

 Edward W. M. Grigg : The Common Service of the British and 

 Indian Peoples to the AVorld (Sir George Birdwood Memorial 

 Lecture). 



Royal society of Medicine (Study of Disease in Children Section), 

 at 5. 



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

 Demonstration on the Contents of the Museum. 



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

 at 5.— W. N. Bond : The Effect of Viscosity on the Plow through 

 an Orifice.- Dr. A. Griffiths and Constance H. Griffiths : The 

 Viscosity of Water at Low Rates of Shear.— 6. P. Partridge and 

 B. S. Smith : A Method of Measuring Frequencies. 



Institution of Mechanical Engineers, at 6.— Sir Richard T. Glaze- 

 brook : Limit Gauging. 



Royal Society of Medicine (Epidemiology and State Medicine Sec- 

 tion), at 8.30.— Dr. W. M. Willoughby : Collated Experiences of 

 Plague on Ships. 



Royal Institution of Great Britain, at 9. — Sir James Walker : 

 Electro-synthesis in Organic Chemistry. 



S.iTURDAY. April 23. 

 Royal Institution or Great Britain, at 3. — H. T. Oldham : The 

 Great Epoch of Exploration ; (1) Portugal. 



CONTENTS PAGE 



The Coal Position I93 



The Conquest of Venereal Disease .... 195 



Plant Evolution. By Prof. A. C. Seward, F.R.S. 197 



A Modern Inorganic Chemistry, By A. J. A. . . 198 



Our Bookshelf 19$ 



Letters to the Editor:— 



"Space" or " yEther " ?— Prof. A. S. Eddington, 



F.R.S, . . . . 201 



" Absolute " Temperatures in Meteorological Publica- 

 tions. — Sir Napier Shaw, F.R.S, . 201 

 Isotopes: Their Number and Classification. (IViik 



D/airraw ) — Prof. William D. Harkins .... 202 



Light and Electrons— Prof. J. Joly, F.R.S. 203 

 Molecular Structure and Energy.— Prof. A. O. 



Rankine 203 



The Normal Orbit of the Electron in the Atom of 



Mercury. — A. Terenin 203 



Doublets in Spectral Series. — D. Rogestvensky . . 203 

 The Resonance Theory of Hearing. — Dr. H. Hart- 

 ridge . . .... .204 



Sexual Organs of Phytophthora. — Prof. Geo. H. 

 Pethy bridge .204 



Stellar Magnitudes and their Determination. III. — 

 Absolute Magnitudes. {IVM Diagram.) By H. 



Spencer Jones .... 205 



Dynamics of Golf Balls. By C. G. K 207 



Nature in a Himalayan Valley. {Illustrated.) By 



Lt.-Col. J. H. Tull Walsh . ... 210 

 The Annular Eclipse of April 8. {Illustrated.) By 

 Dr. A. C. D. Crommelin ; Sir Francis Darwin, 



F.R.S. ; Eleonora Armitage ; E. Leonard Gill . 211 

 Obituary : — 



Prof. S. W. Burnham. By A. C. D. C. ... 212 



Notes . .... 213 

 Our Astronomical Column : — 



Discovery of Pons- Winnecke's Comet 2x7 



Reid's Comet 217 



Double Stars 217 



The Internal Physics of Metals 218 



Mongolian Imbecility 218 



The Alaskan Salmon. By J. J 219 



Recent Applications of Interference Methods . . 2 -o 



University and Educational Intelligence . . . 220 



Calendar of Scientific Pioneers 221 



Societies and Academies .... 222 



Books Received ... 223 



Diary of Societies . . . ...••... 223 



(Index.) 



NO. 268=;, VOL. IO7I 



