Nature, 

 April !4, 1911. 



Index 



xlix 



the Law of Luminosity of the Eclipses of the Moon, 

 A. Danjon, 618; Prominence, A, with Great Radial 

 Velocities, V. Burson, 266; Radiation in Relation to 

 the Position of Spots and Faculac, H. H. Clayton, 631 ; 

 Spectrum from 6500 A. to 9000 A., The, W. F. 

 Meggers, 515; Variation and the Weather, H. H. 

 Clayton, 468 ; L. C. W. Bonacina, 567 



Solidity, The Mechanics of, J. Innes, 377 ; R. G. Durrant, 

 440; V. T. Saunders, 534; Dr. H. S. Allen, 599; 

 J. Inncs, 662 



" Solomia," 575 



-Solubilities of Inorganic and Organic Substances, Dr. \. 

 Seidell. Second edition, 434 



Soluble Chlorides and Sulphates, The Opposed Action of, 

 on Starchy Materials, H. Courtonne, 586 



Solution, .\ Force Field Dissociation Theory of, Applied 

 to some Properties of Steel, Prof. E. D. Campbell, 617 



Solutions, The Ihermochcmical .\nalysis of, Chauvenct, 

 P. Job, and G. Urbain, 42C 



Somatogenic Modifications, Now Experiments on the 

 Inheritance of, Prof. A. Dendy, 742 



Sound-ranging in Use in the French Army during the War, 

 Prof. Weiss, 197 



Sounds, Interrupted Incoherent, G. Valle, 35 



South : Africa, Labour Conditions in. Prof. R. Lehfeldt, 388 ; 

 Medal, The, awarded to Prof. E. Warren, 389 ; Rain- 

 fall Map of, A Contribution to the Study of the, j. R. 

 Sutton, 522 ; the Economic Development of. Some 

 Zoological Factors in, C. VV. Mally, 388 ; The Drying 

 up of, and the Remedy, Sir H. H. Johnston, 2; the 

 Flora of. Causes Leading towards Progressive Evolu- 

 tion of. Dr. T. R. Sim, 388; The Natural History of, 

 F. W. Fitzsinions. Mammals. In 4 Vols. Vols. iii. 

 and iv., 600; .African Agamas AUiod to Agama 

 hispida, A. atra, and A. anchietae, A Revision of the, 

 O. A. Boulenger and J. H. Power, 427; Association, 

 The Bulawayo Meeting of the, 388 ; Clawed Frog, 

 Reflex Times in the, W. A. Jolly, 488 ; Mosses, New 

 and Interesting, H. N. Dixon, 28; Museum, Annals 

 of the. Vol. xvii., part v., 222 ; Xylarias Occurring 

 around Durban, P. A. van der Bijl, 36 ; 

 Wales and Monmouthshire, University College of. 

 Dr. W. T. David appointe<l Prof<ssor of Engineering 

 at the, 424 ; Coalfield, Geographical Aspects of the 

 Distribution of Population on the, D. Lleufer Thomas, 

 389 ; -West Africa, Occanographical Researches on the 

 ♦'oast of. Dr. A. Franz, 355 



Southporf Meteorological Observations for 1919, 545 



Space: Time, and Gravitation: .\n Outline of the General 

 Relativity Theory, Prof. A. S. Eddington, 822 ; -Time 

 Hypothesis before Minkowski, The, E. H. Synge, 



693 

 Spark : -gap, An Apparatus whereby a, included in the 

 Secondary Circuit of a High-tension Transformer, is 

 Rendered Conducting during One-half of Each Cycle, 

 J. J. Dowling and J. T. Harris, 681 ; Spectra of 

 Mercury, Copper, Zinc, and Thallium in the Extreme 

 Ultra-violet, The. L. and E. Bloch, 459 ; of some 

 Elements in the Extreme Ultra-violet, L. and E. Bloch, 



363 

 Sparrow-hawk, Life and Habits of the, J. H. Owen, 425, 



69s 

 Spectra: Absorption. Prof. Baly, 350; of Luminous Gases, 



The Effect of Concentration on the, Prof. T. R. 



Mcrton, 553 ; The Origin of. Prof. A. Fowler, and 



others, 357"; Dr. H. H. Plaskett, 387 

 Spectrochemlcal Study of the a-Allyl and a-AIIylmethyl- 



tyc/ohexanones, Tno. R. Cornubcrt, «s 

 Spectrograph for Ultra-violet Work, J. Ductaux and 



P. Jcantet, S4S 

 Spectrographs, Hilgcr's, 641 



Spectroscopy, l.ecture on. Prof. T. R. Merton, 677 

 Speech, The Mechanism of. Dr. E. W. Scripture, 417 

 Sp.jloologiral Society of the University of Bristol, Presi- 

 dential Address to the. Prof. E. Fawcett, 26 

 Spherical Aberration, The Physical Meaning of, L. C. 



Martin, 469 

 Spiders, Mating Dance* of, G. H. I^ockef, 345 

 Spiranthes aulumnidit in ScollamI, Sir Herb< 1 1 M.ixudl, 



70, 4110; Dr. B. Daydon Jnrkson, 441 



Spiritualism, The Newer, 367 



Spitsbergen : and Bear Island, The Geology of, O. 



Holledahl, 769 ; Forthcoming Expedition to, 542 ; The 



Climate of. Prof. B J. Birkeland, 769 

 Sponges, Siliceous Fossil, of Western Liguria, C. de 



Stefani, 522, 619 

 Springtime and Other Essays, Sir Francis Darwin, 171 

 Squalodont Remains from the Tertiary Strata of Tasmania, 



Prof. T. T. Flynn, 407 

 Squares, .Associated, and Derived Simple Squares of 



Order 5, Major J. C. Burnett, 79 

 Stability of the Steady Motion of Viscous Liquid Contained 



between Two Rotating Co-axial Circular Cylinders, 



The, K. Tamaki and W. J. Harrison, 393 

 Star : A New Variable, of Short Period, A. Danjon, 458 ; 



Dwarf, Another Quickly Moving, R. T. A. Innes, 124; 



The New, in Cygnus, W. F. Denning, 59 ; Major 



W. J. S. Lockyer, 315 

 Stars : Angular Diameters of. Measurements of the. Prof. 



A. Michelson ; Prof. G. E. Hale, 676; Atmospheres of, 



The .Absorbing Powers of the, C. Nordmann, 99 ; in 



Full Daylight, The Photography of, M. Hamy, 362; 



in Space, The Distribution of the. Prof. Kapteyn and 



F. J. Van Rhijn, 356; Interesting Binary, J. S. 

 Plaskett ; Miss A. C. Maury ; F. Pavel, 772 ; Nebulous, 

 The Colour of, F. H. Seares and E. P. Hubble, 223 ; 

 of Type N, A Study of the, C. D. Shand, 842 ; The 

 Diameters of. Prof. H. N. Russell; O. J. Lee and 



G. van Biesbroock, 740 ; The Internal Constitution of 

 the, Prof. A. S. Eddington, 14 ; The Masses of the, 

 J. Jackson and H. H. Furner ; H. v. Zeipel, 578; The 

 Recognition in, of the Successive Layers of their 

 Atmosphere, etc., H. Dcslandres, 166 



Statesman's Year Book, The, Statistical and Historical 

 Annual of the States of the World for 1920, Edited by 

 Sir J. Scott Keltic and Dr. M. Epstein, 276 



Steam-nozzles, The Action in, Prof. A. L. Mellanby and 

 VV. Kerr, 423 



Steel : -frame Building, A Large, Constructed by Welding 

 Methods, 739; The World Hunger for. Sir Robert 

 Hadfield, 738 



Steels: Carbon, Quenching of, Portevin and Garvin, 159; 

 High-speed Containing Chromium and Tungsten, The 

 Structural Constitution of, Prof. Honda, 91 ; The Ar, 

 Point of, and of Martensite, P. Dejean, 394 



Stellar: " Magnitudes," Sir Oliver Lodge, 438; Orbit, Per- 

 turbations in a, J. S. Paraskevopoulos, 451 ; Parallaxes. 

 G. van Biesbroeck and H. S. Peitit, 674; Spectra, A 

 Physical Theory of, Dr. M. N. Saha, 848 



Stephenson, George, Ruth Maxwell, 404 ^. n 



Stereoscopic Appearance of Certain Pictures, The, Dr. 



F. W. Edridge-Green, 375; A. P. Trotter, 503 

 Stethoscope, The, with a Reference to a Function of the 



Auricle, Dr. J. A. Pollock, 682 

 Stirling Ranges of Western Australia, A Geological Recon- 

 naissance of the. Dr. W. G. Woolnough, 231 

 Stocks, Inheritance of Hoariness in. Miss Saunders, 188 

 Stone Implements from the Cooper's Creek District. South 



Australia, Prof. T. G. B. Osborn, 849 



Storms, Wandering, Prof. A. McAdie, 321 



String Figures, W. W. Rouse Ball, 27, 640 , , „ 



Submarine: A Small, for Oceanographic Work, M. 



Laubeuf, 167; -cable Signalling, Dr. F. E. Pernol. 253; 



Phenomena, A Diver's Notes on, Lieut.-Comdr. 



G. C. C. Damant, 242 



Substances Feebly Conducting Electricity, A New Property 

 of, G. Reboul, SSS . . u w . 



Sucrose, Inversion of, A Determination, by Means of n 

 Differential Calorimeter, of the Heat Produced during 

 the. Prof. H. H. Dixon and N. G. Ball, 521 



Sugar: -beet in America, The, Prof. F. S. Harris, 689; 

 from the Cane and Beet, The Manufacture of, 

 T. H. P. Heriot, 68^; Technology and Fermentation, 

 P^f. A. R. Ling, (*) ^ . . 



Suisse, Le Pare National, S. Brumes. Traduit par S. 

 Aubert, 466 ... ^ i 



Sulphide of Lime, Action of, on Lepidopierous Ova. L. 

 Plgorinl and R. Crandiori, 35 



