Nature, "1 



Index 



xxxix 



September 29 



Mme. E. Henriot, 607 ; Technology, Society of, Annual 

 General Meeting of the, Dr. M. W. Travers elected 

 President, 404; the Electrical Conductivity of, Ihe 

 Nature of, H. H. Poole, 584 ^ t u r. --^ 



Glassware : British Laboratory and Scientific, J. H. David- 

 son, 331; used in Dairy Chemistry, Tests on Volu- 

 metric, 663 ; Volumetric, A Comparison of British and 

 German, Sir J. E. Petavel, 297 ^ ^x cu 1 



Globular Clusters, The Distances of the, Dr. H. Shapley 

 and Prof. H. D. Curtis, 825 . , e . 



Glossopteris angustifolia, Brongn., The Cuticular Structure 

 of, B. Sahni, 671 



Glucose : Detecting, A Method allowing the Application to 

 Plants of the Biochemical Method of, M. Bridel and 

 R. Arnold, 575 ; The Electrolytic Reduction of. Prof. A. 

 Findlav and V. H. Williams, 252 



Glycosides 'in some Indigenous Orchids, Extraction of the, 

 P. Delauney, 94 



Glutaric Nitrile, The Action of the Organo-magnesium 

 Compounds on, P. Bruylants, 703 



Gnats, the Destruction of, High-speed Aircraft Propellers 

 and, H. C. Watts, 269 



Gold : -coloured Teeth of Sheep, 249 ; W. J. L. Abbott, 459 ; 

 Sols, The Coagulation Velocity of, A Simple Apparatus 

 for determining, E. Hatschek, 702 



Golf Balls, Dynamics of, 207 



Gorse-seed, Vitality of," J. Parkin, 491 



Goshen, The Land of, and the Exodus, Sir Hanbury Brown. 

 Third edition, 679 



Grain Pests (War) Committee, Final Report, Prof. W. A. 

 Herdman, 180 



Granite-gneisses of Southern Eyre Peninsula (South Aus- 

 tralia) and their Associated Amphobolites, C. E. Tilley, 

 29 



Graphical and" Mechanical Computation, Dr. J. Lipka, 616 



Graphite, Foreign, in 1919, A. H. Redfield, 795 



Gravitation, Relativity and, 742 



Gravitational Relativity, Remarks on, Sir Oliver Lodge, 814 



Great Inheritance : New Studies of a, Being Lectures on 

 the Modern Worth of some Ancient Writers, Prof. R. S. 

 Conway, 744 



Greenland :' Ancient Skulls from, W. E. Le Gros Clark, 532 ; 

 in Europe, D. MacRitchie, 141 ; The Need of 

 the Establishment of a High-power Radio-telegraphic 

 Station in, 402 



Green-plant Matter as a " Decoy " for Actinomyces Scabies 

 in the Soil, W. A. Millard, 318 



Greenwich Observatory : Visit of the Crown Prince of Japan 

 to, 369 ; Visitation of the, 472 



Gregarious Instinct, Protozoa and the Evolution of the, 

 R. J. Ludford, 332 



Gresham's School Natural History Society, Annual Report 

 of the, 791 



Grime's Graves, Norfolk, Discovery of Engravings at, 

 A. L. Armstrong, 403 



Growth-rate, The Dynamics of a Fluctuating, H. S. Reed, 

 222 



Guinea-pigs, The Relative Importance of Heredity and En- 

 vironment in Determining the Piebald Pattern of, S. 

 W'right, 94 



Gun-fire, Distant, The Sound of : Father V. Schaffers, 44 ; 

 C. Carus-Wilson ; Dr. C. Davison, 108 ; Capt. C. J. P. 

 Cave, 140 



Guthrie Lecture, The Sixth, of the Physical Society of Lon- 

 don, Prof. A. A. Michelson, 220 



Gymfwdinium pseudonoctiltica, J. Pavillard, 287 



Gyroscopic Compass, The : A Non-mathematical Treatment, 

 T. W. Chalmers, 328 



Haeckel's Biogenetic Law, Prof. W. Garstang, 542 

 Haemoglobin in Mollusca, Prof. A. E. Boycott, 395 

 Haemolytic Activity of Chemical Substances, A Method for 



Investigating the, E. Ponder, 509 

 " Halo-blight " of Oats, C. Elliott, 155 

 Harmonic Analysis: A. E. Clayton, 759; A Simple Appa- 

 ratus for Approximate, and for Periodicity Measure- 

 ments, Dr. W. L. Balls, 444 

 Harvard Zoological Laboratory, Prof. G. H. Parker ap- 

 pointed Director of the, 244 



Hawaii, The Leguminous Plants of, J. F. Rock, 346 



Haxtoni, The Production of, H. V. Harlan and H. K. 

 Hayes, 251 



Health : and Longevity, Effect of Fatigue on. Dr. H. M. 

 Vernon and E. A. Rusher, 156 ; and Physical Fitness, 

 Testing and Grading of, Dr. A. A. Mumford, 30 ; and 

 Work, Dr. C. S. Myers, 354 



Hearing : The Resonance Theory of, Dr. H. Hartridge, 

 204 ; Dr. W. Perrett, 301 ; Dr. H. Hartridge, 394 ; An 

 Experiment which Favours, Dr. Hartridge, 446 ; Wright- 

 son's Theory of, A Criticism of, Dr. Hartridge, 446 



Heath-fires, The Generation of, E. A. Martin, 811 



Heats of Combustion and Formation of Nitro-compounds, 

 Part i., W. E. Garner and C. L. Abernethy, 158 



Hedgehog: Habits of the, 375; Dr. G. A. Auden, 491; 

 carrying Fruits upon its Spines, The Ancient Legend 

 as to the, M. Christy, 375 



Helicopters : A. Mallock, 553 ; A. R. Low, 622 



Helium Atom. The Constitution of the, E. C. Kemble, 662 



Herbertson Memorial Lecture of the Geographical Associa- 

 tion, The Second, Dr. H. R. Mill, 214 



a-Herculis, The Companion of, R. F. Sanford, 438 



Herons and Fish, Sir Herbert Maxwell, 490 



Hill's, Dr., Cusped Orbit, 503 



Himalaya, A Naturalist in, Capt. R. W. G. Hingston, 210 



Historical Research in 'London, Institute of, 668 



Hittite Seals : With Particular Reference to the Ashmolean 

 Collection, D. G. Hogarth, 70 



Hommes Fossiles : Les, Elements de Pal^ontologie Humaine, 

 Prof. M. Boule, 322 



Homogeneous Vibrations, The Quantum Theory and. Sir 

 Arthur Schuster, 233 



Hong-Kong, Royal Observatory, Report for 1920 of the, 

 Claxton, 824 



Hopkinson, Bertram, The Scientific Papers of, Collected 

 and Arranged by Sir J. Alfred Ewing and Sir Joseph 

 Larmor, 675 



Hot-wire Inclinometer, The, R. H. Humphry, 126 



Human : Embryo, A, Prof. Bryce, 180 ; Emotion, Galvano- 

 metric Measurement of. Dr. A. D. Waller, 183 ; Evolu- 

 tion, The Problem of. Prof. A. Dendy, 691 ; 

 Palaeontology, Prof. A. Keith, 322 ; Sciences, A Sug- 

 gested Institute of, 769 



Humanities, The Place of the, in the Education of Men 

 of Science, Prof. C. Desch, 655 



Huygens, Christiaan, Oiuvres Completes de. Tome Quator- 

 zi^me. Calcul des Probabilities. Travaux de Math6- 

 matiques Pures, 1655-1666, 4 



Hydracarina, Species of. Occurring in Britain, C. D. Soar 

 and W. Williamson, 150 



Hydraulic Mining Debris in the Sierra Nevada, Dr. G. K. 

 Gilbert, 404 



Hydraulics, Journal of. Proposed Issue of a, 437 



Hydrogen : -ion Concentration of Some Natural Waters, 

 The, J. T. Saunders, 190 ; Ions, The Determination 

 of. Dr. W. M. Clark, 772 ; The Manufacture of, for 

 the Synthesis of Ammonia, G. Claude, 351 



Hydrogenation : by Platinum Black, Velocity of the Re- 

 action in the, G. Vavon, 831 ; of some Marine Animal 

 Oils, The, H. Marcelet, 734 

 Hydrography of the Nile Basin. 90 



Hydroids of the Western India'n Ocean, The, Florence E. 



Jarvis, 413 

 Hydrology of the Western States of North America, Dr. B. 



Cunningham, 406 

 Hydrometers and Specific-gravity Instruments, Pastorelli 

 and Rapkin's List of, 247 



Iberica, 215 



Ibos of Nigeria, Among the. Rev. G. T. Basden, 495 



Ice in the Arctic Seas, Report for 1920 of the State of the, 



216 

 Ichneumoq-flies : of the Genus Apantales, C. F. W. 

 Muesebeck, 532 ; of the Tribe Ephialtini, R. A. Cush- 

 man, 532 

 Icones Plantarum Formasanarum, B. Hayata. Vol. ix., 346 

 Idar State, India, Geology of, C. S. Mfddlemiss, 827 

 Igneous Rocks : Chemical Analyses of, Dr. H. S. Washing- 

 ton, 151 ; of Encounter Bay, South Australia, The, 

 W.R. Browne, 795 



