XXVlll 



Index 



Nature, 

 _Scpteniher 29, 192 1 



Professor of Chemistry and Metallurgy at the, 540 ; 

 Prof. H. C. Plummer appointed Professor of Mathe- 

 matics at the, 604 



Asellus aquaticus, Prof. C. Chilton, 180 



Aspergillus fumigatus, the Agglutinating Power of Thorium 

 Sulphate on the Spores of, A. Sartory and P. Bailly, 

 478 



Astrology : Dr. C. Singer, 771 ; The Mediaeval Attitude 

 toward, particularly in England, T. O. Wedal, 771 



ASTRONOMICAL NOTES. 



Comets : 



Pons-Winnecke's Comet, 55; New Comet, 1921a, 119; 

 Pons-VVinnecke's Comet, 153; Comet Reid 1921a, 

 153 ; Discovery of Pons-Winnecke's Comet, Prof. Bar- 

 nard, 217; Reid's Comet, Miss V'inter Hansen, 217; 

 Pons-Winnecke's Comet, 247; Reid's Comet, M. Ebell ; 

 W. P. Denning, 247; Reid's Comet, 311; Neujmin 

 Comet, 345; Pons-Winnecke's Comet, 345; A New 

 Comet, 1921C, 373; Reid's Comet, 373; Pons-Win- 

 necke's Comet, 373 ; Dubiago's Comet, Dr. Steaven- 

 son, 405 ; Pons-Winnecke's Comet, Prof. Crawford and 

 Miss Levy, 405 ; Pons-Winnecke's Comet, W. F. 

 Denning, 438; Comets, 471; Pons-Winnecke's Comet, 

 G. Merton ; VV. F. Denning, 601; Search for Meteors 

 from the Pons-Winnecke Radiant, Prof. Barnard , 

 R. G. Chandra, 694 ; Detection of Encke's Comet, 

 J. F. Skjellerup, 825 



Meteors : 

 Large Meteors on March i and 2, W. F. Denning, 55 ; 

 The Fireball of March 2, W. F. Denning, 88 ; Large 

 Detonating Fireball, W. F. Denning, 153 ; Recent 

 Brilliant Fireballs, W. F. Denning, 182 ; The Meteoric 

 Radiants of June 25-30, W. F. Denning, 535 ; Recent 

 Meteors, W. F. Denning, 634 ; The August Meteors, 

 W. F. Denning, 694 ; The August Meteoric Display, 

 \\'. F. Denning, 793 ; The Recent Meteoric Display, 

 W. F. Denning, 825 



Observatories : 



Brazilian National Observatory Annual, 1921, 119; 

 Stonyhurst College Observatory Report, 503 ; Report of 

 the Kodaikanal Observatory for 1920, 535 ; The Cape 

 Observatory, Sir Joseph "Larmor, boi 



Planets : 



The 1920 Opposition of Mars, E. C. Slipher and G. H. 

 Hamilton, 24 ; The Rotation of Venus, Prof. W. H. 

 Pickering, 88; Re-appearance of Saturn's Ring, A. 

 Danjon and G. Rougier, 119; Theory of Jupiter's 

 Satellites, Prof. .Sampson, 405 ; Occultation of Venus, 

 566; The Figure of the Earth, Prof. T. J. J. See, 

 601 ; The Minor Planet' Eros, F. E. Seagrave, 663 ; 

 Jupiter's Four Great Satellites, Prof. W. de Sitter; Dr. 

 A. J. Leckie, 663 ; Displacement of Lines in the 

 Spectrum of Venus, Dr. C. E. St. John and S. B. 

 Nicholson, 725 ; Planetary Photography, E. C. Slipher, 

 725 ; Continuation of the Ephemeris of Eros, F. E. Sea- 

 grave, 793 ; Study of the Moon's Surface, W. Good- 

 acre, S25 



Stars : 



Ancient Star Maps, Dr. M. Schonfeld, 24 ; Two Nebula; 

 with Unparalleled Velocities, Prof. V. M. Slipher, 55 ; 

 Nova Aquilae HL, C. F. Butterworth, 182 ; Double 

 Stars, J. Jackson-, 217; Fixed Calcium Lines in Early 

 Type Stars, R. K. Young, 247 ; 1646 Spectroscopic 

 Parallaxes, W. S. Adams, A. H. Joy, G. Stromberg 

 and C. G. Burwell, 281 ; A Catalogue of Radial 

 Velocities, J. Vodte, 281 ; Photographic Catalogue 01 

 the Globular Cluster. Messier 15, Rev. H. E. Macklin, 

 311 ; A Photo-electric Study of Algol, Prof. J. 

 Stebbins, 311 ; The Eclipsing Variable U Cephei, 

 R. S. Dugan, 373 ; Speculations on the Formation 

 of Spiral Nebulae, A. .Veronnet, 438; The Companion 

 of a Herculis, R. F. Sanford, 438; Nova Cygni HL 



(1920), W. F. Denning, 471 ; Collision of Star and 

 Nebula, Prof. E. W. Brown, 471 ; The Total Amount 

 of Starlight, Dr. P. J. van Rhijn, 566 ; Periodicity of 

 \ariable Stars, Dr. J. G. Hagen, 566; The Variable 

 Nebulae in Corona .Australis, H. K. Shaw, 634; 

 Statistics of Proper Motions, Prof. J. C. Kapteyn and 

 Dr. P. J. van Rhijn, 694; Measurement of the Dia- 

 meter of Arcturus, F. G. Pease, 725 ; Variable Stars, 

 Miss- Cannon ; S. Williams ; C. Hoffmeister, 759 ; Mr. 

 Flint's Parallax Observations, 759; The Distances of 

 the Globular Clusters, Dr. H. Shapley and Prof. H. D. 

 Curtis, 825 



Sun -: 



The Accelerations of the Sun and Moon, Dr. H. Jeffreys, 

 281 



Miscellaneous : 



The Date of Easter, 24 ; A Simplified Calendar Reform, 

 Rev. E. Fanfani, 88 ; Another Investigation of the 

 Einstein Spectral Shift, A. Perot, 182 ; Eclipse of 

 Rhea by Titan, 345; Dr. Hill's Cusped Orbit, 503; 

 " L'Astronomie et les Astronomes," A. Collard, 503; 

 Popular Astronomy in Sweden, 535 ; Another Plan of 

 Calendar Reform, Prof. R. Baire, 634 ; .Auroree at a 

 Height of 500 km., Dr. C. St0rmer, 663; Bright 

 Object near the Sun, Prof. Campbell, 759, 793 



Astronomical Society of the Pacific, Award of the Bruce 

 Gold Medal of the, to Dr. H. A. Deslandres, 115 



Astronomy : Prehistoric, in Scandinavia, Dr. M. Schoneld, 

 24; Popular, in Sweden, 535; The Application of 

 Interference Methods to, H. Spencer Jones, 685; 

 Theoretical and Descriptive, The Elements of, C. J. 

 White. Eighth edition. Revised by P. P. Blackburn, 

 58a 



.'\th<2naeum Club : Dr. H. K. Anderson, Prof. W. M. Bay- 

 liss, and Sir William Bragg, elected Members of the, 

 84; Prof. J. Norman Collie and Sir W. Morley 

 Fletcher, elected Members of the, 213 



Atmospheric Refraction, A. Mallock, 456 ; Dr. J de Graaff 

 Hunter, A. Mallock, 745 



Atom : The " Cubical " Model of the, Dr. I. Langmuir, 

 310; The Size of the, lonisation Potential and, Prof. 

 A. S. Eve, 553 



.Atomic : Heat of the Elements, The, E. van Aubel, 703 ; 

 Radius, The, and the lonisation Potential, Prof. Megh 

 Nad Saha, 682 ; Structure, Prof. N. Bohr, 104 ; Dr. 

 Norman R. Campbell, 170 ; Magnetism and, Dr. A. E. 

 Oxley, 652 ; Symbols, Dalton and, Prof. M. Delacre, 

 440 ; Weights, Isotopes and, Dr. F. W. .Aston, 334 



Atoms and Isotopes, Dr. F. W. Aston, 633 ; and Molecules, 

 The Dimensions of. Prof. W. L. Bragg and H. Bell, 

 107 ; The Dimensions of, Prof. W. L. Bragg, 758 ; The 

 Heayy. The Electronic Structure of, L. de Broglie and 

 A. Dauvillier, 670 ; The Stability of. Sir Ernest Ruther- 

 ford, 574 



•Audition, Wrightson's Hypothesis of. Dr. H. Hartridge, 

 811 



Augite from Nishigatake, Japan, Prof. R. Ohashi, 189 



Aurora Borealis : of May 13, 1920 The, Dr. C. St0rmer, 

 671 ; Lord Rayleigh, 392 ; The, and The Simultaneous 

 Magnetic Phenomena, B. Lyot, 478 ; In the South of 

 England, The Common Occurrence of, Lord Rayleigh, 

 137 ; Recent W'ork on. Dr. C. Chree, 565 



Aurorae at a Height of 500 km. Dr. C. St^rmer, 663 



Auroral Display, A. E. L. Hudson, 359 



Australasian Association, The Melbourne Meeting of the, 

 408 ; 440 ; Resignation of J. H. Maiden of the Per- 

 manent Honorary Secretaryship of the, ; E. G. Andrews 

 elected Permanent Honorary Secretary ; G. H. Knibbs 

 elected President of the ; Award of Medals to R. T. 

 Baker and Prof. C. Chilton, 408 



Australia, The Organisation of Science in. Prof. T. H. 

 Laby, 124 ; 442 



Australian : .Aboriginals, The Cultural Anthropology of, Sir 

 Baldwin Spencer, 410 ; Carabidae, Revisional Notes on, 

 part vi., T. G. Sloane, 640: Diptera Brachycera, 

 Studies in Life-histories of. Part i., Stratiomyiidae. 



