588 



NATURE 



[January 29, 1920 



Problemes Economiques d'Apres-Guerre. By L. de 

 Launay. Pp. 319. (Paris: A. Colin.) 3.50 francs. 



The' Manufacture of Intermediate Products for 

 Dyes. By Dr. J. C. Cain. Second edition. Pp. xiH- 

 273. (London : Macmillan and Co., Ltd.) los. net. 



Diesel Engine Design. By H. F. P. Purday. 

 Pp. xvi + 301. (London: Constable and Co., Ltd.) 



The Use of Colloids in Health and Disease. By 

 A. B. Searle. Pp. vii+120. (London: Constable and 

 Co., Ltd.) 85. net. 



DIARY OF SOCIETIES. 



THURSDAY, January 29. 

 Royal Institution of Grkat Britain, at 3. — Dr. R. R. Terry: 



Renaissance Music in Italy atid England. 

 Royal Socieiy, at 4.30. — Prof. W. P. ate son : The Genetics of 



"Rogues" among Culinary Peas {Pis7im sativuvi). — L. T. Hogben : 

 Studies on Synapsis. I. Oogenesis in the Hymenoptera. — H. Onslow: 



A Periodic Structure in many Insect Scales, and the Cause of their 



Iridescent Co'ours. 

 Royal College of Physicians, at 5. 

 Royal Institute of Public Health, at 5. — Dr. O. May : Tuberculosis in 



relation to Life Assurance. 

 Royal Society of Medicine (Balneology and Climatology Section), at 



5.30. — Dr. N. Wood and Others : Discussion on the Merits and Defects 

 of the British Health Resorts. 

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

 R. C. Clinker : A Portable Valve Set and some properties of C. W. Circuits. 

 Society of Antkjuakies, at 8.30. 



FRIDAY, January 30. 

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



Observations and I')iscoveries in Anatomy and Surgery ; His Contributions 



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

 Institution of Civil Engineers (Students' Meeting), at 6. — R. B. 



Dunwoody : The Economic Requirements for Inland Navigation Trans- 

 port in the British Isles (Vernon-Harcourt Lecture). 

 Institution of Electrical Engineers (Students' Meeting) (at the City 



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



Edgcumbe and Oth'ers : Discus-ion on Quantity ProHuction as a Panacea. 

 Junior Institutiom op- Engini-:rks, at 7.30. — G. E. Lygo : The 



Manufacture of Hydrogen Gas by the Silicol Process for Airships and 



Commercial Purposes. 

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



Gyrostatic Compass. 



SATURDAY, January 31. 

 Royal Institution of Great Britain, at 3.— Sir F. W. Dyson : 



The Astronomical Evidence bearing on Einstein's Theory of Gravitation : 



I. Movement oi the Perihelion of Mercury. 

 Physiological Society (at Kings College), at 4. 

 MONDA r, February 2. 

 Victoria Institute (in Committee Room B, Central Hall, Westminster). 



at 4.3o.-^Sir Andrew Wingate: India. 

 Royal College of Surgeons, at 5. 

 Institute of Actuarie.s, at 5.— A. Henry: Some Further Suggestions on 



the Subject of Approximate Valuations.— H. L, Trachtenberg : A New 



Method of Valuing Policies in Groups. 

 Aristotelian Society (at 74 Grosvenor Street"), at 8. — Mrs. N. A. 



Duddington and Others: Discussion on Lossky's Intuitive Basis of 



Knowledge. 

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



Photography in War and Peace (Cantor Lecture). 

 Society of Che.mical Industry (at the Chemical Society), at 8.— H. M. 



Wells and J. E. Soulhcombe : The Theory and Practice of Lubrication ; 



The Germ Process. 

 Royal Institute of British Architects, at 8.30.— J. W. Simpson: 



Presidential Address to Students. 

 Royal Geographical Society (at the Central Hall, Westminister), at 



8.30.— Major-Gen. Sir Frederick Sykcs : Air Routes of the Empire. 

 Medical Society of London, at 9.— Dr. H. R. Spencer : Tumours com- 

 plicating Pregnancy, Labour, and the Puerperium (Lettsomian Lecture), 

 TUESDAY, February 3. 

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



The Evolution of Man and the Early History of Civilisation. 11. Ele- 

 phants and Ethnologists. 

 Royal Society of Arts (Colonial Section), at 4.30.— Sir Francis Watts: 



Tropical Departments of Agriculture, with special reference to the West 



Indies. 

 Royal Photographic Society of Great Britain (Technical Meeting), 



at 7.— L. A. Jones : A Non-intermittent Sensitometer. 

 Rontgen Society (at the Medical Society of London), at 8.15. 



WEDNESDAY, February 4. 

 Royal Society of Art-;, at 4.30.— A. E. Hayes : The English Language 



and Internationa! Trade. 

 Royal College of Surgeons, at 5. 

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



Sections through the Andes of Peru and Bolivia : U. From the Port of 



Mollendo to the Inambari River. 

 Royal Aeronautical Society (at the Royal Society of Arts), at 8.— 



Squadron-Leader J. E. M. Pritchard : Rigid Airships and their Develop- 

 ment. 

 Institution of Automobile Engineer.s (at the Institution of Mechan- 

 ical Engineers), at 8.— A. P. Young and H. Warren: The Progress of 



Ignition. 

 Society of Public Analysts and Other Analytical Chemists (at 



the Chemical Society), at 8. HAnnual General Meeting), Dr. S, Rideal: 



Presidential Address.— F. S. Sinnatt and L. Slater: An Investigation 



into the Composition of the Unsaturated Hydrocarbons present in Coal 



Gas. — H. Trickett : The Estimation of the Available Oxygen in Sodium 



Perborate and in Perborate Soap Powderjs. 



THURSDAY, February 5. 

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



Recent Progress in Applied Optics. 

 Royal Society, at 4.30. — J. H. Jeans and Others: Discussion on the 



Theory of Relativity. 

 Linnean Society, at 5.— Dr. R. Rucglcs Gates : The Existence of Two 



Fundamentally Different Types of Characters in Organisms. 

 Chemical Society, at 8. 



FRIDAY y February 6. 

 Royal Collece of Surgeons, at 5. 

 Concrete iNSTiruTa (at Denison House, 296 Vauxhall Bridge Road), 



at 6. — H. J, G. Bamber : The Practical Testmg of Cement. 

 Institution OF Electrical Engineers (Students' Meeting) (at the City 



and Guilds (Engineering) College), at 7. — F. R. Housden : Electric Lifts 



and Cranes. 

 Royal Society of Medicine (.A,naesthetics Section), at 8.30.— Dr. F. S. 



Rood : Discussion on Ana;->thesia in Throat and Nose Operations. 

 Royal Institution of Great Britain, at 9.— Prof. Sir Walter 



Raleigh : Landor and the Classic Manner. 



SATURDAY, February 7. 

 Royal Institution of Great Britain, at 3. — Sir F. W. Dyson: 



The Astronomical Evidence bearing on Einstein's Theory of Gravitation. 



11. Displacement of Solar Spectral Lines. 



contents. page 



TheJWorks of Torricelli. V>\ J. L. E. D 557 



Problems of the Fruit-grower 558 



Metaphysical Research 559 



Medical and Social War-work in Egypt .... 5613 



Scientific Biography. By N. R. C 561 



Our Bookshelf ... 56:2 



Letters to the Editor: — 



The Deflection of Light during a Solar Eclipse. — 



Prof. Alexr. Anderson 563 



"The While Water."— Capt. A. R. Palmer ; Prof. 



J. Stanley Gardiner, F.R.S. 563 



Proposals for a Plumage Bill. — L. Gardiner; 



Willoughby Dewar 5^4 



The Sepcir.Uion of Isotopes. — Dr. Alexander Fleck 565 

 A Helium Series in the Extreme Ultra- Violet. — 



Prof. Theodore Lyman 565 



Mirage Effect-s.— Cicely M. Botley 565 



British Irono-res.— D. A. E. Evans ; Prof. Henry 



Louis 565 



Displacement of Spectral Lines. — Robert W. 



Lawson 561; 



Orthogenetic Evolution in Pigeons. (Illustrated.) 



By R. R. G 566 



The Nitrogen Problem. II 568 



Exploration in Tibet and Neighbouring Regions. 

 T. H. H 



By' 



570 



Notes 571 



Our Astronomical Column : — 



New Comet 1920a • 576 



Spectrum of Comet Brorsen-Metcalf 576 



The Fireball of January 16 576 



Open Stellar Clusters 576 



Paris Academy of Sciences : Prizes Proposed for 

 1921 577 



Applied Plant Morphology 578 



The Royal Society of Western Australia. By 

 J. W. G 



A New Development in Agricultural Research . . 



Mathematical Statistics 



The Kinematograph in Schools 



Irrigation in Egypt 



Vertebrate Remains in the Caverns of Grimaldi 

 Apparatus for Vapour-pressure Determinations . . 



Experiments on Train Resistance 



The Evolution of Botanical Research. By Prof. 



John M. Coulter 



University and Educational Intelligence 



Societies and Academies 



Books Received 



Diary of Societies 



57S 

 579 

 579 

 580 

 580 

 581 

 581 

 S8i 



581 



585 

 S86 



587 

 588 



NO. 2622, VOL. 104] 



Editorial and Publishing Offices : 



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Editorial Communications to the Editor. 



Telegraphic Address : Phusis, London. 



Telephone Number : Gerrard 8830. 



