820 



NATURE 



[February 17, 192 1 



Isomerism of Carbon- Nitrogen Compounds.— F. W. Ataok : The 

 Structural Isomerism of Oximes. Part II. Constitution of Oximes. ' 

 — F. S. Kipping- : Organic Derivatives of Silicon, Part XXV. | 

 Saturated and Unsaturated SiUcohydrocarbons, WijPhf^. 

 EoNTGEN SociKir (at University College), at 8.15. — N. E. Luboshe* : 

 Intensifying- Screens and Secondary Radiation. 



FRIDAY, Febbuaet 18. 

 Association or Economic Biologists, Annual General Sleeting- 

 (in Botanical Lecture Theatre, Imperial College of Science), at 

 2.30. — Sir David Prain : Some Helationships of Economic Biology. 

 Geological Society of London, at 3. — Annivorsary Meeting. 

 RoTAL SociETi OF ARTS (Indian Section), at 4.30. 

 Royal Sociktx of Medicine (Otology Section), at 5. — Dr. A. R. 

 Friel : Zinc lonisation and Electrolysis in the Treatment of 

 Chronic Otorrhoea. 

 Royal College of Subgeons of England, at 5. — -T. F. Dobson : The 

 Function of the Kidneys in Enlargement of the Prostate Gland 

 (Arris and Gale Lecture). 

 Institution of Mechanical Engineers, at 6. — Annual General Meet- 

 ing. — F. M. Farmer : The Desirability of Standardisation in the 

 Testing of Welds. 

 Institution of Electrical Engineers (Students' Section) {at King's 

 College, Strand), at 6.30. — L. B. Atkinson: Presidential Address. 

 Royal Society of Tropical Medicine and Hygiene (at U Chandos 

 Street, W.l), at S.I.5.— Lt.-Col. J. O. Kennedy: Pathology of 

 Relapsing Fever. — Dr. A. M. Cole: Five Cases of Sasciolopsis 

 Infection. — Dr. A. Connall : Examination of Chrysops for 

 Filaria in West Africa. 

 Royal Society of Medicine (Electro-Therapeutics Section), at 8.30. 

 Royal Institction of Great Britain, at 9. — S. J. Solomon : Strategic 

 Camouflage. 



SATJmBAY, Febrvary 19. 



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



Spectroscopy (Regularity in Spectra). 1 



MONDAY, Febbuary 21. 



Victoria Institute (at Central Hall, Westminster), at 4.30. — 



Lt.-Col. F. A. Molouy : Prophecy. 

 Royal college of Slrgeons of England, at 5. — J. H. Evans: The 

 Azygos System of Veins in their Association with Surgical 

 Affections (Arris and Gale Lecture). 

 Aristotelian' society (at University of London Club, 21 Gower 

 Street), at 8. — Miss H. D. Oakeley and Others : Space, Time, 

 and Deity. 

 Royal Society of Aets, at 8. — Dr. E. K. Rideal : Applications of 

 Catalysis to Industrial Chemistry : Processes of Oxidation 

 (Cantor Lecture). 

 Chemical Indvstry Club (at 2 Whitehall Court), at 8.— Lt.-Col. 



W. CuUen : South Africa. 

 Royal Gkographical Society (at .Eolian Hall), at 8.30.— Dr. H. 



Rice : The Rio Negro Casiquiare Canal and Upper Orinoco. 

 Medical Society of London (at 11 Chandos Street, W.l), at 9.— 

 G. E. Gask : Surgery of the Lung and Pleura (Lettsomian 

 Lecture J. 



TUESDAY, February 22. 

 Royal Ixstiictiox of Great Britain, at 3. — Prof. A. Keith: 

 Darwin's Theory of Man's Origin, in the I^ight of Present Day 

 Evidence. 

 Royal Horticcltlral Society, at 3. 



Royal society of Medicink (Medicine Section) (at Guy's Hospital), 

 at 4.— Dr. G. H. Hunt : An Experimental Oxygen Chamber.— 

 Dr. G. Marshall ; Apparatus for Induction of Artificial Pneumo- 

 thorax. — Dr. G. H. Hunt and Dr. E. P. Poulton : Congenital Heart 

 Disease with vVnaly^is of the Arterial Blood. — Dr. C. P. Symonds : 

 A Case of Charcot-Marie-Tooth Muscular Dystrophy with Pseudo 

 Hypertrophy.— Dr. 6. H. Hunt : Cardiac Efficiency in Normal 

 and Pathological Conditions. — J. M. H. Campbell : Factors in 

 the Causation of Dyspnoea. — Dr. J. \. Ryle : The Diagnostic Value 

 and the Limitations of the Fractional Test-meal. 

 Royal College of Physicians of London, at 5.— Dr. Martin Flack: 

 Respiratory Efficiency in Relation to Health and Disease (Milroy 

 Lecture) . 

 Zoological Society of London, at 5.30.— Dr. P. Chalmers Mitchell : 

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

 Month of January, li)2l.— Prof. Elliot Smith : Exhibition of Photo- 

 graphs of Live Examples of Tarsius. — A. Mallock : Colour-pro- 

 duction in Relation to the Coloured Feathers of Birds. — E. 

 Dukinfield -Tones : Descriptions of New Moths from South-East 

 Brazil.- — Dr. J. Stephenson : Morphology. Classification, and 

 Zoogeography of Indian Oligochnsta.- Dr. N. S. Lucas: Report 

 on Deaths in the Society's Gardens during the Tear 1920.— Dr. 

 R. Broom : The Structure of the Reptilian Tarsus. 

 Institition of Civil Engixkers, at 5.30. — P. .\llan : Port Improve- 

 ments at Newcastle, N.8.W. 

 Institution of Petroleum Technologists (at Royal Society ot 



Arts), at 5.30. 

 Royal Photographic Society of Great Britain, at 7. — D. Charles : 



Improvements in Flashlight. 

 Royal Anthropological Institute (at Royal Society), at 8.15. — 

 Sir Alfred T. Davies : The Scheme of the Welsh Department of 

 the Board of Education for the Collection of Rural Lore in Wales 

 through the Schools. To be followed by a Discussion. 

 WEDNESDAY, February 23. 

 Royal Society of Arts, at 4.30.~ Sir Daniel Hall : The Present 



Position of Research in Agriculture (Trueman Wood Lecture). 

 Geological Society of London, at 5.30. — Prof. W. J. Sollaa : 

 Sarcammiva Cartflri, Brady, and the Minute Structure of the 

 Foraminiferal Test.— Dr. T. S. Wilson : Notes on the Views of 

 the Late Prof. C. Lapworth with Regard to Spiral Movements 

 in Rocks during Elevation or Depression. 

 Institution of Civil Engineers (Students' Meeting), at 6. — J. H. 

 Barker ; ifachinery Applied to Mass Production. 



NO. 2677, VOL. 106] 



THURSDAY, Febbuabt 24. 



Medico-Psychological Association of Ghkat Britain and Ireland 

 (at II Chandos Street, W.l), at 2.45. — Sir Frederick Mott and 

 Dr. Hayao : The Pathology of Dementia Praecox, especially lu 

 Relation to the Condition of the Ovaries. 



Royal Institution of Great Britain, at 3. — F. Balfour Browre : 

 Mason Bees and Wasps. 



Royal Society, at 4.30. — Probable Papere.— Sir Ray Lankester : A 

 Remarkable Flint-implement from Selsey Bill.— Dr. E. J. Allen : 

 Regeneration and Ueproductiou of the Syllid Proeeraatea. — E. C. 

 Grey and K. G. Young: The Enzymes of li. coH cotnmunh. 

 Part 11. (a) Anaerobic Growth followed by Anaerobic and Aerobic 

 Fermentation, (b) The Effects of Aeration during the Fermenta- 

 tion. — Dr. A. E. Everest and A. J. Hall: Anthocyamns and 

 Anthocyanidins. 



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

 Sir Leonard Rogers: Presidential .address.— Dr. J. G. Thomson 

 and Dr. A. Robertson : The Value of Laboratory Reports in the 

 Diagnosis of Suspected Dysentery, and their Interpretation by 

 the Clinician. 



Royal College of Physicians of London, at 5.— Dr. Martin Flack : 

 Respiratory Efficiency in Relation to Health and Disease (Milroy 

 Lecture). 



Institution of Electrical Engineebs (at Institution of Civil 

 Engineers), at ().— Prof. E. Wilson : Magnetic Susceptibility of 

 Low Order. II. Susceptibility Value?. 



Illuminating Engineering Society (at Royal Soeiety of Arts), at 

 8.— Discussion : The Use of Lieht as an 'Aid to Publicity. 



Royal Society of Medicine (Urology Soetion), at 8.30. 

 FRIDAY, February 25. 



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

 at 4.30. -Sir Humphry Rolleston and Others: Discussion on The 

 Diagnosiw and Treatment of Congenital Syphilis and its EfTcets. 



Physical Society of London (at Imperial College of Sciencl, 

 at 5.— R. H. Humphry : A Note on the Hot-Wire InclinometT. 

 —Profs. E. Wilson and Herroun : The Magnetic SusceotibilitT 

 of (Vrtain NatuT-al and Artifici.il Oyides.— J. Guild : The R*-- 

 fractometry of Prisms.— T. Smith : Tracing Rays through an 

 Oiiticn' Svstem. . . 



Royal Society of ^fKDiciNE (Enidemiologv and State Medicine 

 Section), at 8.30.— Dr. R. M. F. Pieken : The Epidemiology of 

 Measles in ft Rurnl and Residential Area. 

 SATURDAY. February 26. 



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

 Spectroscopy (Celestial Spectroscopy). 



CONTENTS. PAGE 



Introduction . . 7'^' 



A Brief Outline of the Development of the Theory 



of Relativity. By Prof. A. Einstein .... • . 7'^2 

 Relativity : The Growth of an Idea. By E. 



Cunningham .... 7'H 



RelativityandtheEclipaeObservationsof May, 1919. 



{IVrU Dia<ri-am.) By Sir Frank Dyson, F.R.S. . 7S6 

 Relativity and the Motion of Mercury's Perihelion. 



By Dr. A. C. D. Crommelin ... 7 "'7 



The Displacement of Solar Lines. By Dr. Charles 



E. St. John 7S9 



Non-Euclidean Geometries. By Prof. G. B. 



Mathews, F.R.S • • 790 



The General Physical Theory of Relativity. By 



J. H. Jeans, Sec.R.S .• 7"J 



The Michelson-Morley Experiment and the Di- 

 mensions of Moving Bodies. By Prof. H. A.' 



Lorentz, For.Mem.R.S •• 7')3 



The Geometrisation of Physics, and its Supposed 



Basis on the Michelson-Morley Experiment. By 



Sir Oliver Lodge, F.R.S 795 



Electricity and Gravitation. By Prof. H. Weyl 800 



The Relativity of Time. By Prof. A. S. Eddington, 



F.R.S ^ ^"' 



Theory and Experiment in Relativity. By Dr. 



Norman Carppbell .■_■ S04 



The Relation between Geometry and Einstein s 



Theory of Gravitation. By Dorothy Wrinch and 



Dr. Harold Jeffreys 806 



The Metaphysical Aspects of Relativity. By Prof. 



H. Wildon Carr ^09 



Bibliography of Relativity |" 



Notes . ^'4 



Our Astronomical Column : — 



lonisation in the Sun - '° 



The First Voyage round the World . 810 



Secular Change in the Period of 8 Cephei 816 



University and Educational Intelligence .... 817 



Calendar of Scientific Pioneers S17 



Societies and Academies |^'° 



Books Received ^'* 



Diary of Societies °'9 



