556 



NATURE 



[January 22, 1920 



DIARY OF SOCIETIES. 



THURSDAY, January 22. 



4lovAi. Instttution of Great Britain, at 3. — Dr. R. R. Terry: 

 Renaissance Music in Italy and England. 



Royal Sccietv, at 3.30 (Special General Meeting). At 4.30.— Prof. E. G. 

 Coker and K. C. Chakko ; The Stress-strain Properties of Nitro-cellnlose 

 and the Law of its Optical Behaviour.— S. Marsh: Alternating-Current 

 Electrolyte is. — W, H. Eccles and J. H. Vincent : The Variations of Wave- 

 length of the Oscillations Generated by the Three- Electrode ' hermionic 

 Tube due to Changes in Filament Current, Plate Voltage, Grid Voltage, or 

 Coupling. — S. D. Carothers : Plane .Strain. The Direct Determination of 

 Stress. — F. Horton and Ann C. Davies : An Investigation of the Effects 

 of Electron Collisions with Platinum and with Hydrogen, to ascertain 

 whether the Production of lonisation from Platinum is due to Occluded 

 Hydrogen. — L. IJairstow, R. H. Fowler, and D. R. Hartree : The 

 Pressure Distribution on the Head of a Shell moving at High Velocities, 



Institution OF Mining and Metallurgy (at the Geological Society), 

 at 5.30. — W. Broadbridge : Froth Flotation: Its Commercial Application 

 and its Influence on Modern Concentration and Smelting Practice. 



Institution of Electrical Engineers (at the Institution of Civil 

 Engineers), at 6. — J. L. Thompson : Transformers for Electric Furnaces. 



CoNCRETH Institute (296 Vauxhall Bridge Road), at 7.30.— Dr, J. S. 

 Owens : The Attrition of Concrete Surfaces exposed to Sea Action. 



Harvkian Society (at the Medical Society of London), at 8.15.— Annual 

 General Meeting. 



FRIDAY, January 23. 



Royal Society op Medicine (Study of Disease in Children Section), 

 at 4.30. 



Physical Society of London (at the City and Guilds Technical College, 

 Leonard Street), at 5. — Dr. J. H. Vincent: Maintained Oscillations in 

 Triode Valve Circuits. — Dr. W. Eccles : Measurements of the Chief 

 Parameters of Triode Valves.— F. W. Jordan ; Measurement of Ampli- 

 fication of a Radio-frequency Amplifier. — F. E. Smith; The Measure- 

 ment of Amplification given by Triode Amplifiers at Audible and at 

 Radio Frequencies. — Hon. C. W. Stopford and C. R. Darling: Exhibi- 

 tion ofa Method of Determining the Hardening Temperature of Steel. — 

 C. R. Darling : Exhibition ofa Thermal Cell of Constant Voltage. 



KoYAL College of Surgeons, at 5.— Prof. A. Keitli : John Hunter's 

 Observations and Discoveries in Anatomy and Surgery; His Contribu- 

 tions to our Knowledge of the Alimentary System (Hunterian Lecture). 



Institution of Mechanical Engineers, at 6.— E, M. Bergstrom : 

 Recent Advances in Utilisation of Water Power. 



Junior Institution of Engineer's (at 39 Victoria Street), at 7 30.— 

 J. A. Reavell : Evaporation in ihe Chemical Industry. 



Royal Society of Medicine (Epidemiology and Stale Medicine Section), 

 at 8.30. — Dr. F. G. Crookshank : Principles of Epidemiology. — Dr. 

 Cleland and Dr. Campbell : Epidemiology of Acute Encephalomyelitis. 



KovAl Institution of Great Britain, at 9.— Hon. Sir Charles Parsons : 

 Researches at High Pressures and Temperatures. 



SATURDAY, January 24. 

 Royal Institution of Great Britain^ at 3.— A. Noyes : Aspects of 



Modern Poetrj-. 

 Physiological Society (at King's College), at 4. 



MONDAY^ January 26. 



Royal College of SuRrnoNs, at 5.— Prof. A. Keith : John Hunter's 

 (Observations and Discoveries in Anatomy and Surgery ; His Contribu- 

 tions to our Knowledge of the Kidneys, Bladder, and Urethra, and 

 Diseases connected with these Structures (Hunterian Lecture). 



RovAL Society of Arts, at 8.— Caot. H. Hamshaw Thomas: Aircraft 

 Photography in War and Peace (Cantor Lecture). 



JioYAL Society of Medicine (Odontology Section), at 8.— S. F. St. J. 

 Steadman ; Dental Sepsis in Children : Its Consequences and Treatment. 



Medical Society of London, at 8.30.— Pathological Evening. 



TUESDAY, January 27. 



Royal Horticultural Society (at Vincent Square, S.W. i), at 3. 



Royal Institution of Great Britain, at 3.— Prof. G. Elliot Smith: 

 The Evolution of Man and the Early History of Civilisation: I. Man's 

 Origin. 



Institution of Civil Engineers, ai 5.30.— J. Mitchell : Whitby Harbour 

 Improvement.- R. F. Hindmarsh : The Design of Harbours and Break- 

 waters with a View 10 the Reduction of Wave-action Wiihin Them.— 

 J. W. Sandeman : Wave-action in Harbour Areas ; with Special Reference 

 to Works for Reducing it at BIyth and Whitby Harbours.— W. Simpson : 

 The Improvement of the Entrance to Sunderland Harbour, with Reference 

 to the Reduction of Wave-action. 



Royal Photographic Society of Great Britain (Lantern Meeting) 

 at 7. — Major W. Bladon : Life on the Gold Coast. 



Royal Anthropological Institute, at 8.15.— Annual General Meeting 

 WEDNESDAY, January 28. 



Royal Society of Arts, at 4.30.— Sir Cecil Hertslet : The Ruin and 

 Restoration of Belgium. 



Royal College ok Surgeons, at 5.— Prof. A. Keith : John Hunter's 

 Observations and Discoveries m Anatomy and Surgery: His Contribu- 

 tions to our Knowledge of the Genital and Rcprodnctive Systems 

 (Hunterian Lecture). 



British Academy (at the Royal Society), at 5.- Dr. C. Singer : Magic and 

 Medicine in Early England. 



THURSDAY, January 29. 

 Royal Institution of Great Britain, at 3.— Di 

 Renaissance Music in Italy and England. 



r. R. R. Terry: 



Royal Soci El V, at A-3o.-^Prol'ab'l7 ''Pa/>ers : Prof W. Bale<;on • The 

 Genetics of " Rogues" among Culinary Peas {Pistim sativum).— 

 fc ■'^^,*'8»en: Studies on Synapsis. 1. Oogenesis in the Hymenoptera.— 

 H. Onslow : A Periodic Structure in many Insect Scales, and the 

 Cause of their Iridescent Colours. 



Royal College of Physicians, at 5. 



Royal Society of Medicine (Balneology and Climatology Section) at 

 ^\^°-~~^\- si- ^°°^^^^^ Others: Discussion on the Merits and Defects 

 of the British Health Resorts. 



NO. 2621, VOL. 104] 



Wireless Society or London (at Institution of Civil Engineers), at 6. — 

 R. C. Ciinker ; A Portable Valve Set and some properties of C. W. Circuits, 



FRIDAYt January 30. 

 Royal C llfge of Surgeons, at 5. — Prof. A. Keith : John Hunter's 



Observations and Discoveries in Anatomy and Surgery ; His Contributions 



to our Knowlege of the Eye, Ear, and Nose (Hunterian Lecture). 

 Institution of Electrical Engineers (Students' Meeting) (at th« City 



and Guilds -Technical College, Leonard Street), at 7. — Major K. 



Edgcumbe and Others : DiscuS'iion on (Quantity ProHuction as a Panacea. 

 Royal Institution of Great Britain, at 9.— S. G. Brown: The 



Gyrostatic Compass. 



SATURDAY, January 31. 

 Royal Insthution of Great Britain, at 3.— Sir F. W. Dyion 



The Astronomical Evidence bearing on Einstein's Theory of Gravitation 



l. Movement of the Perihelion of Mercury. 

 Physiological Society (at King's College), at 4. 



CONTENTS. PAGE 



Wind and Barometric Gradient. By W. H. Dines, 



F.R.S. 525 



Researches on Fluorescence. By R 526 



Scientific Study of the Sugar Group 526 



Nutrition and Longevity 527 



Cheese- and Butter-making • 528 



Our Bookshelf 529 



Letters to the Editor: — 



Gravitation and Light. — Sir Joseph Larmor, 



M.P., F.R.S. . ." 530* 



The Outlook of British Technical Optics —Prof. F. 



Cheshire . . 530 



Power from the Sun. — A. A. Campbell Swinton, 



F.R.S. 532 



Sedimentation of Blood Corpuscles. — Prof. A. E. 



Boycott, F.R.S. . 532 



The Einstein T|ieory and Spectral Displacement. — 

 H. Fletcher 'Moulton and Dr. Andrew C. D. 



Crommelin 532 



Use of a Prismatic Binocular for Viewing Near 



Objects. — Capt. D. Wilson Barker 532 



The Nitrogen Problem. 1 533 



The Microscopy of Metals. (/i!u5«ra(ed.) By C. H. D. 535 

 Report of the Calcutta University Commission, 



By Sir E. Denison Ross 537 



Notes 539 



Our Astronomical Column : — 



Large Fireball on January 16 544 



Prof. W. H. Pickering's Lunar Studies ;;44 



The Solar Eclipse of May 29, 1919 '544 



Symposium on the Microscope 545 



Construction and Use of Microscopes. By J. E. 



Barnard 546 



Microscopical Optics. By Prof. A. E. Conrady . . 548 

 Paris Academy of Sciences : Bonaparte and 



Loutreuil Foundations 550 



The Mathematical Association. By Prof. William 



P. Milne 550 



Industrial Research Associations 551 



The Organisation of Imperial Statistics. By G. H. 



Knibbs 551 



Italian Papers on Relativity. By Dr. L. Silberstein 552 

 Agriculture at the British Association. By Prof. 



Alex. Lauder 553 



University and Educational Intelligence 554 



Societies and Academies 554 



Books Received 555 



Diary of Societies 556 



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