XXXVl 



Index 



t Nature, 



September 29, ig2t 



Dimethyl Oxalate, Decomposition of, by Acetic Acid, Dr. 



E. E. Turner and F. H. H. Wilson, 832 

 Diospyros, A New Species and a New Variety of, W. P. 



Hiern, 640 

 Diplotaxis erucoides, Radical Bacilli of, R. Perotto, 127 

 Diptera (iii), C. G. Lamb, 413 ; Found in Association with 



Termites, Some, G. F. Hill, 799 ; Secondary Sexual 



Characters in the, with a Description of a Novel Type, 



C. G. Lamb, 509 ; Venational Abnormalities in, C. G. 



"Lamb, 189 

 Direction-finding Wireless and Marine Navigation, J. J. 



Bennett, 363 

 Disease, The Fight against, 308 

 Dissolved Salts in Dilute Solution, The Variation of the 



Specific Refraction of, C. Ch^nevaux, 575 

 Divers, The Biological Study of, A. Thooris, 607 

 Double : Pendulum, A New Theorem on the, H. S. Rowell, 



684 ; Surface Layer, Potential of a, M. Picone, 478 

 Doublets in Spectral Series, D. Rogestvensky, 203 

 Douglas Fir, A Fungoid Disease of the. Dr. D. Wilson, 437 

 Dragon-flies, The Soaring Flight of. Dr. E. H. Hankin, 509 

 Drosophila, The North American Species of, Dr. A. H. 



Sturtevant, 743 ; virilis. Sterility of Mutant Hybrids in, 



C. W. Metz, 223 ^ 



Drought, The, and Underground Water, B. Hobson, 684 

 Droughts, Great British, C. Harding, 627 

 Drugs, Synthetic, The Chemistry of. Dr. P. May. Third 



edition, 423 

 Dubiago Comet, 1921, 373; Dr. Steavenson, 405, 471; A. 



Schaumasse, 542 

 Dublin University, Conferment of Honorary Degrees upon 



Prof. W. M.' Bayliss, Prof. E. Borel, and Prof. A. A. 



Michelson, 91 ; D. Clark, appointed Professor of Civil 



Engineering at Trinity College ; Conferment of Degrees, 



bo3 

 Duck, Development of the Feathers of the, during the 



Incubation Period, Miss Augusta Lamont, 639 

 Durance, The Presence of a Sub-alluvial Sheet of Thermal 



or Mineralised Water in the Bed of the, W. Kilian and 



F. Blanchet, 639 



Durham University, Impending Conferment of Honorary 

 Degrees upon Sir E. H. W. Tennyson d'Eyncourt and 

 Prof. A. Meek, 91 ; Conferment and Proposed Confer- 

 ment of Degrees, 604 ; Conferment of Honorary Degrees, 

 700 



Dust from Coal-mines, Apparatus for Testing, S. R. Illing- 

 worth, 87 



Dye-making Industry, Appointment of a Committee to 

 Advise the Board of Trade with respect to the Develop- 

 ment of the, 629 



Dyes : and Dyeing, Prof. J. Huebner, 421 ; and Dyestuffs, 

 British, 673 



Dyestuffs : Application of, to Te.xtiles, Paper, Leather, and 

 other Materials, Dr. J. M. Matthews, 421 ; British, Cor- 

 poration, 162 



Dynamics : Elementary, A Text-book for Engineers, J. W. 

 Landon, 134; of Golf Balls, 207 



Ear, Diseases of the. Dr. P. D. Kerrison. Second edition, 

 743 



Earth : Cooling of the. Certain Geological Effects of the, 

 Dr. H. Jeffreys, 445 ; The Figure of the. Prof. T. J. J. 

 See, 6oi ; Pressure, Theories of, A. L. Bell, 596 



Earthquake : in Asmara, Eritrea, 823 ; in China, of Decem- 

 ber 16, 21; of October 3, 1920, P. Glangeaud, 94; 

 Shocks, Recent, 370; The Chinese, of December 16, 

 1920, Dr. C. Davison, 473 



Earthquakes registered at the De Bilt Observatory, 216 



Earth's Crust: A Superior Limit to the Age of the. Prof. 

 H. N. Russell, 125 ; Chemistry of the. Dr. H. T. 

 Washington, 693 



Earthworms: Drowned in Puddles, Sir E. Ray Lankester, 

 329 ; J. H. Coste, 360 ; R. B. Marston, 779 ; Mud- 

 worms, and Water-worms, Sir E. Ray Lankester, 424 



Easter Island, Carved Rocks and Stone Houses on, Mrs. S. 

 Routledge, 564 



Eastern North America^ Nature of Palseozoic Crustal 

 Instability in. Dr. C. Schuchert, 501 



Echinoderm Fauna of Torres Strait, The, Dr. H. L. Clark, 

 712 



Echinus miliaris, the Plutei of. Reversal of Asymmetry in, 

 H. Ohshima, 125 



Eclipse : of Rhea by Titan, 345 ; The Annular, of April 8, 

 Major W. J. S. Lockyer, 303 



Eddy Current 'Losses in Cylindrical Conductors, with Special 

 Applications to the Alternating Current Resistances of 

 Short Coils, S. Butterworth, 573 



Edinburgh University: The Prof. Tait Memorial, 90; Dr. 

 H. S. Allen, appointed Reader in Physics ; Dr. R. 

 Campbell, Reader in Petrology; and Dr. L. Dobbin, 

 Reader in Chemistry, 411 ; Resignation of Dr. Beard 

 as Lecturer in Comparative Embryology, and of Dr. 

 Balsillie as Lecturer in Chemistry, 411 ; Bequest to, by 

 Dr. H. Barnes, 637 ; Conferment of Degrees, 669 



Education : and World Citizenship : An Essay towards a 

 Science of Education, J. C. M. G'arnett, 386, 707; as a 

 Science, 386 ; Scientific Study of. The xXeed for the, 

 Prof. A. Mackie, 442 ; The Encyclopaedia and Dic- 

 tionary of, part i., 103 



Educational Associations, Ninth Annual Conference of. 

 Report of the, held at University College, 'London, 192 1, 

 231 



Egg-colour and Broodiness in Poultry, Inheritance of, Prof. 

 Punnett and the late Major P. G. Bailey, 85 



Egypt : British School in. Work of the, Prof. W. .M. F. 

 Petrie, 564; Sumer and. Early Chronology of. Prof. S. 

 Langdon, 315; The Development of the Oil Resources 

 of, E. M. Dowson, 502 



Egyptian : Neogene Echinoderms, R. Fourtau, 86 ; Survivals, 

 Ancient, in Modern Egypt, Prof. C. G. Seligman, 27 



Eiffel Tower, Simultaneous Oscillations of the Pressure and 

 Wind at the Top of the, R. Dongier, 510 



Einstein Spectral Shift, Investigation of the, A. Perot, 182 



Einstein's Gravitational Theory, A Difficulty in, G. W. 

 Walker, 169 ; Prof. A. S. Eddington, 170 



Elasticity, The Case of Poincar6 in the Theory of, E. 

 Jouguet, 30 



Elder Edda, The, and Ancient Scandinavian Drama, Dr. 

 Bertha S. Phillpotts, 168 



Electric: Current, The Theory of the Analysis of an, by 

 Periodic Interruption, Dr. G. Barlow, 574; Discharge 

 in Hydrogen at Low Pressures, The Minimum Potential 

 of, E. Dubois, 799; Furnaces, A. Gallenkamp and Co. 's 

 Revised Catalogue of, 182 ; Spark, The Brightness of 

 the, L. Bull, 253 ; Traction in connection with Heavy 

 Railway Work, Sir Philip Dawson, 181 



Electrical : and .Mechanical Methods of Connecting the Pro- 

 pellers of a Ship with the Steam Turbines, comparison 

 of the, L. Jauch, 724 ; Conductivity of Glass, The 

 Nature of the, H. H. Poole, 584 ; Disturbances, The 

 Recent Magnetic and. Dr. C. Chree, 399 ; Engineers, 

 Institution of. Granting of a Royal Charter for the, 821 ; 

 Theory and Relativity, 133 



Electrician's Pocket Book for 192 1, The Practical, Edited by 

 H. T. Crewe, 232 



Electricity : and Magnetism, Elements of the Mathematical 

 Theory of. Sir J. J. Thomson. Fifth edition, 647 ; The 

 Mathematical Theory of, J. H. Jeans. Fourth edition, 

 133 ; Inquiry, The London, 609 ; Technical, An Intro- 

 duction to, S. G. Starling, 296 



Electrified Pith Ball in an Ionised Atmosphere, Behaviour 

 of an. Dr. D. Turner and D. M. R. Crombie, 381 



Electro-crystalline Properties as conditioned by Atomic 

 Lattices, Sir Joseph- Larmor, 125 



Electroculture, Height and Spacing of Wires in. Dr. C. 

 Chree, 632 



Electrodeless Discharge in Sodium Vapour, The, Prof. J. K. 

 Robertson, 269 



Electro-magnetism, Oersted — the Discoverer of, 492 



Electron : Emission, Effect of, on the Temperature of the 

 Filament, and Anode of a Thermionic Valve, G. Stead, 

 216; in the Atom of Mercury, The Normal Orbit of the, 

 A. Terenin, 203 ; The Gravitational Field of an. Sir 

 Oliver Lodge, 392 



Electrons : Sir William Bragg. 79, 109 ; ^^ther Waves and, 

 Sir William Bragg, 374 ; 'Light and. Sir Oliver Lodge, 

 169; Prof. J. Joly, 203 



