XXXIV 



llldcX- 



NatHre, 

 L June iS, 1903 



Olsen (Julius), Free Ions in Aqueous Solutions of Electro- 

 lytes, 45 



Olszewski (Prof.), Apparatus for the Liquefaction of Air 

 and Hydrogen, 494 



Omori (Dr. F.), Macro-seismic Measurements in Tokio 

 between September, 1887, and July, 1889, 88-9 ; Horiz- 

 ontal Pendulum Tromometer, 619 ; Transit Velocity of 

 the First Preliminary Tremor of Earthquakes of Neai 

 Origin, 019 ; Seismological Notes, 619 



Oolite Period and Earliest Man, Castology : a View of the, 

 J. Craven Thomas, 461 



Ootheca Wolleyana, 219 



Oppolzer (Egon von), Photography of Stellar Regions, 280 



Opposition of Mars, W. F. Denning, 525 



Optics : Curvature of Wheel Spokes in Photographs, R. M. 

 Milne, 8; Photographs of Cross-sections of Hollow Pen- 

 cils formed by Oblique Transmission through an Annulus 

 of a Lens, Miss A. Everett, 46 ; Equality of the Velocity 

 of Propagation of the X-rays and of Light in Air, R. 

 Blondlot, 46; the Propagation of Light in a Uniaxal 

 Crystal, Prof. A. W. Conway, 71 ; a Simple Experiment 

 in 'Diffraction, Prof. G. H. Bryan, F.R.S., 80; Deter- 

 mination of the Exact Position of a Mercury Meniscus 

 Illuminated by a Bundle of Horizontal Rays, G. Lipp- 

 mann, 95 ; Apparatus for Determining the Duration 

 of Luminous Impressions on the Retina, Maurice 

 Dupont, 96 ; Velocity of Light and the Solar 

 Parallax, M. Perrotin, 119; Death of Otto Hilger, 

 208 ; Obituary Notice of, 230 ; Transmission of Vision 

 to a Distance by Electricity, Lieut. J. H. Coblyn, 

 252 ; Duration of Light Sensations, Dr. Gotz Martius, 

 252 ; Reflection and Refraction of Light, Lord Kelvin, 

 334 ; Light for Students, Edwin Edser, 340 ; the Epidia- 

 scope, Carl Zeiss, 376 ; the Visibility of Ultra-microscopic 

 Particles, H. Siedentopf and R. Zsigmondy, 380 ; on 

 Skew Refraction Through a Lens, Prof. J. D. Everett, 

 382; the Lighthouse Work of Sir James Chance, Bait., 

 386 ; the Production of Metallic Surfaces having the 

 Properties of Japanese " Magic " Mirrors, Thomas 

 Thorp, 406; the Theory of Optics, Paul Drude, 413 ; Two 

 Peculiar Effects of Light, Chromophyton rosanoffi, 

 Micrococcus phosphorus." Dr. H. Molisch, 426; Lamp 

 Lighted by Means of Bacteria, Prof. Hanos Molisch, 

 468 ; Action of a Polarised Bundle of verv Refrangible 

 Radiations on Very Small Electric Sparks,' R. Blondlot, 

 431 ; Common Basis of the Theories of Microscopic 

 Vision, Julius Rheinberg, 470; the Helmholtz Theorv of 

 the Microscope, J. W. Gordon, 551 ; a New- Binocular, 

 473! tne Hypnagogic Images, Vves Delage, 527; a New 

 Kind of Light, R. Blondlot, 527 ; on Refraction at a 

 Cylindrical Surface, A. Whitwell, 550; a New Lens, Mr. 

 Blakesley, 550; Spherical Aberration of the Eye, Edwin 

 Edser, 559; Method of Demonstrating Newton's Rings 

 by Transmitted Light, H. X. Davis, 573 



Ores, Metals, Fuels, &c, Aids to the Analysis and Assay 

 of, J. J. Morgan, 201 



Organic Chemistry : Le\ikon der Kohlenstoff-Verbin- 

 dungen, M. M. Richter, 78 ; Notions Fundamentales de 

 Chimie Organique, Prof. Ch. Moureu, 269 ; Theoretical 

 Organic Chemistry, J. B. Cohen, 485 



Organic Selection : Development and Evolution ; including 

 Psychophysical Evolution, Evolution by Orthoplasy, and 

 the Theory of Genetic Modes, James Mark Baldwin, 202 



a Orionis : Variation in Magnitude of, Dr. E. Packer, 16 ; 

 Variability of, Herr J. Plassman, 137 



Ornithology: November Swallows, G. W. Bulman, 56; 

 Nesting-mound of the Mallee (Lipoa ocellata), A. W. 

 Milligan, 65 ; London Birds and Other Sketches, T. 

 Digby Pigott, 102; Ootheca Wolleyana, 219; British 

 Wild Goose, Anser paludosus, F. Coburn, 252 ; Bird- 

 extermination about Cairo, Dr. W. Innes, 328 ; Ornith- 

 ological Results of Mr. B. Alexander's Expedition to 

 Fernando Po, 373 ; Birds of the Outer Hebrides, J. A. 

 Harvie-Brown, 399 ; Feathers of the Emeu, Mr. Le Souef, 

 399 ; the Birds of Bempton Cliffs, E. W. Wade, 472 ; 

 Variation in Birds, F. Finn, 521 ; the Japanese Artificial 

 Treatment of Long-tailed Fowls, J. T. Cunningham, 

 527 : the Action of Birds' Wings, Dr. T. Bvard Collins, 

 542; Birds of North and Middle America, R. Ridgway, 

 5q4 ; Bullfinch and Canary, George Henschel, 609 ; Lord 

 Lilford on Birds, T. Digby Pigott, C.B., Supp. February 



5, 1903, iii ; Lord Lilford, T. Digby Pigott, C.B., Supp. 



February 5, 1903, iii 

 Orr (Prof. W. McF.), the Principle of Activity and 



Lagrange's Equations. Rotation of a Rigid Body, 36S ; 



Proof of Lagrange's Equations of Motion, 415 

 Orton (Dr. K. J. P.), Isomeric Change in Benzene Deriv- 

 atives, Lecture at Roval Society, 332 

 Osier (A. F., F.R.S.), Death of, 615 

 Ostwald (W.), Hand- und Hulfsbuch zur Ausfuhrung 



physikochemischer Messungen, 101 ; the Principles of 



Organic Chemistry, 171 

 Oxford, Entomology at, 572 

 Oxygen Generator, Portable Automatic, 375 

 Oysters and Typhoid Fever, Prof. R. T. Hewlett, 370 



Pacific Cable, Completion of the, 12 



Packer (Dr. E.), Variation in Magnitude of a Orionis, 16 

 Page (F. J. M.), Radium Bromide, 616 



Palaearctic Butterflies, Catalogue of the Collection of, 

 formed by the late John Henry Leech, Richard South, 



5 8 3 

 Paleobotany : Fossil Flora of the Cumberland Coalfield, 

 E. A. Newell Arber, 94 ; Remarks on E. A. Newell 

 Arber's Communication, on the Clark Collection of Fossil 

 Plants from New South Wales, Dr. F. Kurtz, 94; Vege- 

 tative Activity at the Epoch of the Coal-measures, B. 

 Renault, 384; Dictyozamites in England, A. C. Seward, 

 F.R.S., 478; Fruits and Seeds of British pre-Glacial 

 and inter-Glacial Plants (Thalamiflorae), Mrs. Reid, 551 

 Palsolithics : L'Age de la Pierre, G. Riviere, 55 

 Palaeontology : Phylogeny of the Proboscidea, Dr. F. 

 Ameghino, 113; Tooth of Hippopotamus amphibius 

 Found in the Mendip Hills, E. Ernest Lowe, 157; a New 

 Horse from the Western Islands, Prof. Cosser Ewart, 

 239 ; the Elk in the Thames Valley, Edwin T. Newton, 

 262 ; an Ossiferous Cavern of Pliocene Age at Dove 

 Holes, Buxton, Prof. W. Boyd Dawkins, F.R.S., 287; 

 Contribution to the History of Fossil Man, Albert 

 Gaudry, 359 ; Study of the Cranium of a Beaver of the 

 Quaternary Period, Dr. Camilio Bosco, 374 ; Fossiliferous 

 Band at the Top of the Lower Greensand, near Leighton 

 Buzzard, G. W. Lamplugh and J. F. Walker, 406; 

 Systematic Position of the Armoured Dinosaurs from the 

 Ipper Cretaceous of the Gosau District, F. B. Nopessa, 

 jun., 426; Fishes in the Devonian Layer of the Pas-du- 

 Calais, J. Gosselet, 455 ; Remains of the Ostrich Struthio 

 karatkeodoris in the Upper Miocene Deposits of Samos. 

 Rudolf Martin, 478; Remains from the " Grotte des 

 Enfants," Dr. R. Verneau, 499: " Pelycosaurian " Rep- 

 tiles of the Permian and Triassic Formations of North 

 America, E. C. Case, 520 ; Gigantic Sauropod Dinosaur 

 from the Oxford Clay, near Peterborough, E. N. Leed<=, 

 617 ; Text-book of Palaeontology, Karl A. von Zittel, 

 Supp. February 3, x 

 Palmer (William f.), Lake-country Rambles, 79 

 Pan-potential, the, Sound Waves and Electromagnetics, 



Oliver Heaviside, F.R.S., 202 

 Pannekoek (Ant.), Untersuchungen iiber den Lichtwechsel 



Algols, 558 

 Papaw-trees and Mosquitoes, E. Ernest Green, 487 

 Para, Report of the Yellow Fever Expedition to, of the 

 Liverpool School of Tropical Medicines, H. E. Durham, 



■7 2 



Paradox of the Piano Player, the, Prof. G. H. Brvan, 

 F.R.S., 127 



Parallax, Stellar, A. S. Flint, 594 



Paris (Gaston), Death of, 442 



Paris : the Generators of Electricity at the Paris Exhibition 

 of iqoo, C. F. Guilbert, 4 ; the Aftermath of the Paris 

 Exhibition, Dr. F. Mollwo Perkin, 463 ; Paris Academy 

 of Sciences, 23, 46, 71, 03, 119, 143, 167, 192, 215, 239, 

 263, 287, 311, 335, 330. 383. 40". 43'. 455. 47''. 503, 5 2 7. 

 55'. 575. 59°. 623; Paris Academy of Sciences Prizes for 

 1902, 215: the Solidification of Fluorine and the Com- 

 bination of Solid Fluorine with Liquid Hydrogen, Profs. 

 H. Moissan and J. Dewar at the Paris Academy of 

 Sciences, 497; Compte rendu du deuxieme Congres 

 International des Math^maticiens tenu a Paris, 6 au 12 

 Aout, 1900, 245 ; Rapports pr^sentes au Congres Inter- 

 national de physique re'uni a Paris en 1900, 556 



