256 



NATURE 



[April 21, 192 1 



Part ii.— J. Read and H. G. Smith: Besearches on Piperitone. 

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

 Piperitone. 



I.NSTiTUTii OF Metals (at Sir John Cass Technical Institute), at 8. — 

 ur. W. 11. Ormandy : Kefractories. 



BOntgen SociEir (in Phjsics Theatre, University College), at 8.15.— 

 Prof. A. M. Tyndall and E. G. Hill : A New Form of Stereo- 

 fluorosoope. — Descriptions and Demonstrations of New X-ray, Klec- 

 trical, and Photographic Apparatus. — The British Thomson- 

 Houston Co., Ltd. : A New Current Stabilising Device for Use 

 with the Coolidge Tube ; The Potter-Bucky Diaphragm.— H. B. 

 Gough : Investigation in the Measurement of High Tension 

 Currents.— Solus Electrical Co. : Rotating Deep Therapy Tube- 

 holder ; New Centrifugal Mercury Gas and Paraffin Interrupter ; 

 Pneumatic Cassette. — C. Andrews : X-rays and Propaganda. — 

 R. S. Wrigrht : The Episcope.— Dr. L. Levy : Further Points in 

 the Manipulation of Impex Plates.— A. E. Dean : New Interrupter. 

 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. Richards : The Action of Bacteria and Protozoa in' 

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

 Methods of Infection of the Apple Canker Fungus. 



Royal Society of Abts (Indian Section), at 4.30. — Lt.-Col. Sir 

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

 Indian Peoples to the World (Sir George Birdwood Memorial 

 Lecture). 



Royal Society of JIedicine (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 Flow through 

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

 Viscosity of Water at Low Rates of Shear.— G. F. Partridge and 

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



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

 brook : Limit Gauging. 



Sociological Society, South-eastern Union of Scientific Societies, 

 and Regional Association (Joint Meeting) (at Linncan Society), 

 at 6.— G. Morris : The Saffron W'alden Survey. 



Institution of Electrical Engineers (Students' Section) (at Pins- 

 bury Technical College), at. 6..30.— R. C. Hawkins: Searchlights 

 as used for Coast Defence Work. 



Technical Inspection Association (at Royal Society of Arts), at 

 7.30. — X. S. E. Ackermann : Physical Properties of Clay. 



-Junior Institution of Engineers, at 8. — H. P. H. Anderson : Con- 

 struction and Working of Marine Water-tight Doors. 



Royal Society of IMedicinf. (Epidemiology and State Medicine Sec- 

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

 Plague on Ships. 



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

 Electro-synthesis in Organic Chemistry. 



SATURDAY, April 23. 

 HOTAL Institution of Great Britain, at 3. — H. Y. Oldham : The 

 Great Epoch of Exploration ; (1) Portugal. 



MONDAY, April 25. 

 RoTAL Society of ^[f.dicine (Special General Meeting), at 5. 

 Royal College of Surgeons of England, at 5. — Prof. 8. G. Shat- 

 tock : Demonstration on Pathological Specimens in the Museum. 

 Institute of Actuaries, at 5. — C. W". Kenchington : Modern 

 Developments in the Methods of Industrial Assurance Valua- 

 tions. 

 Institution of Electrical Engineers (Informal Meeting) (at Char- 

 tered Institute of Patent Agents), at 7.— C. L. Lipman and 

 Others : Engineering in Russia. 

 ; Royal Society of Arts, at 8. — Dr. S. J. Lewis : Recent Applica- 

 tions of the Spectroscope and the Spectrophotometer to Science 

 and Industry. 

 ■Royal Society of Medicine (Odontology Section), at 8. — G. G. 

 Campion and J. Millard : Some Notes on the Growth of the 

 Face. 



TUESDAY, April 26. 

 Royal Institution, at 3. — Prof. A. Keith : Darwin's Theory of 



Man's Origin in the Light of Present-Day Evidence. 

 Institution of Civil Engineers. — Special General Meeting, at 



5.1.5. Animal Oeneral Mopt'ng. at .*) 30. 

 Royal Photographic Society of Great Britain, at 7. — Chapman 

 Jones : IMemorial Lecture on the Life and Work of the late 

 Sir William de Wiveleslie Abney. 

 Illuminating Engineering Society (at Rovnl Society of Arts^, at 

 8.— W. J. Jones : Ship-lighting in Relation to Comfort, Safety, 

 and Efficiency. 

 Royal Anthropological Institute, at 8.15.^A. Grimble : From Birth 

 to Death in the Gilbert Islands. 



WEDNESDAY, April 27. 

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



Nationalisation and Bureaucracy. 

 Institution of Petroleum Technologists (at Royal Society of 

 Arts), at 5.30.— Dr. T. 0. Bosworth : The Oilfields of Northern 

 Canada. 

 Royal Sanitary Institute, at 5.30. — Col. C. H. Melville : Some 



Lessons of the War. 

 Institute of Physics (at Institution of Civil Engineers) (Inaugural 



Meeting), at 6. — Sir J. J. Thomson and Others: Addresses. 

 Institution of Automobile Engineers (at Institution of Mechanical 

 Engineers), at 7.— H. L. Heathcote : The Ball Bearing— in the 

 Making, under Test, and on Service. 



Royal Society of Arts, at 8. — Sir James P. Hinohliife : Research 

 in the Wool Industry. 



Egypt Exploration Society (at Royal Society), at 8.30.,— Prof. 8. 

 Langdon : Early Chronology of Sumer and Egypt and Similarities 

 of their Culture. 



THURSDAY, April 28. 



RoyHl Institution of Great Britain, at 3. 



Royal Society, at i.SO.— Probable Paper*.— Prof. H. Lamb and R. V. 

 Southwell : The Vibrations of a Spinning Disc. — Dr. W. Rosen- 

 hain : The Hardness of Solid Solutions. — W. Hartree and Prof. 

 A. V. Hill : A Method of Analysing Galvanometer Records. — 

 F. H. Newman : A New Form of Wehnelt Interrupter. — T. L. 

 Ibbs : Some Experiments on Thermal Diffusion. — B. N. Chak- 

 ravarty : The Diffraction of Light Incident at Nearly the Critical 

 Angle on the Boundary between Two Media. 



Institution of Electrical Engineers (at Institution of Civil 

 Engineers), at 6.— Discussion on Tariffs.— J. R. Blaikie : Elec- 

 tricity Supply— Present Conditions and the Hopkinson Principles. 

 —J. W. Beauchamp : Multi-Part Tariffs for Domestic Electricity 

 Supply. 



Royal Socifjy of Medicine (Urology Section), at 8.30. 



FRIDAY, April 29. 



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

 Demonstration on the Contents of the Museum. 



Institution of Electrical Engineers (Students' Section) (at City 

 and Guilds (Engineering) College) (Annual General Meeting), 

 at 6.30.— A. C. Warren : Radio-telegraphic Transmitting Ap- 

 paratus. 



Royal Institution of Qreat Britain, at 9.— Sir Frank W. Dyson : 

 -Advances in Astronomy. 



SATURDAY, April 30. 

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

 Great Epoch of Exploration ; (2) Spain. 



CONTENTS. PAGE 



University Grants in the Civil Service Estimates . 225 



Colloidal Theory. By W. B. Hardy, F.R.S 226 



The Epistemological Problem. By Prof. H. 



Wildon Carr 228 



Vertebrate Morphology. By F. W. G 229 



Ancient Metal Implements 230 



Our Bookshelf 231 



Letters to the Editor: — 



The Quantum Theory and Homogeneou.s Vibrations. — 



Sir Arthur Schuster, F.R.S 233 



Variegation in a Fern. — Dr. W. Bateson, F.R.S. . 233 

 The "Flight" of Flying-fish. {Illustrated.)— ^'ir 



David Wilson-Barker; Prof. F. Wood-Jones 233 

 "Space" or "/Ether" .'—Dr. Norman R. Camp- 

 bell; L. C. W. Bonacina 234 



Meteors on the Moon.— J. W. Gordon, K.C. ; Dr. 



Andrew C. D. Crommelin 234 



Calendar Reform.— Alexr. Philip 235 



The Hall of the Age of Man in the American 

 Museum. (Illustrated.) By Prof. Henry Fairfield 



Osborn ... 236 



The Rise and Development of the Sussex Iron 



Industry . . 240 



Long-distance Telephony 241 



Obituary 242 



Notes 242 



Our Astronomical Column : — 



Pons-Winnecke's Comet 247 



Reid's Comet . 247 



Fixed Calcium Lines in Early Type Stars . . . . 247 

 The New Star of 1912— Nova Geminorum II. By 



Major William J. S. Lockyer 248 



Gold-coloured Teeth of Sheep 249 



The History of Metamorphic Insects. By G. H. C. 249 



Oil in Western Sinai. By H. B. Milner 250 



Genetics of Cereals. By R. R. G 250 



University and Educational Intelligence . . . 251 



Calendar of Scientific Pioneers 252 



Societies and Academies 252 



Books Received -54 



Diary of Societies 255 



NO. 2686, VOL. 107] 



