Nature, ] 
October 24, 1912 
Ions: Velocities of Ions in Dried Gases, R. T. Lattey and 
H. T. Tizard, 24 
Irises, W. R. Dykes, Dr. F. Cavers, 497 
Iron: Permeability of Iron for Hydrogen, G. Charpy and 
S. Bonnerot, 53; Cast Iron in the Light of Recent 
Research, W. H. Hatfield, Prof. J. O. Arnold, F.R.S., 
169; Sinhalese Iron and Steel of Ancient Origin, Sir R. 
Hadfield, F.R.S., 360; Canadian Iron Ores: Magnetic 
Concentration, G. C. Mackenzie, 37 
Iron and Steel Institute: Gold Medal, 90; Annual Spring 
Meeting, 278; Autumn Meeting, 667 
Irrigation and Physical Properties of the Soil, A. Mintz 
and E. Lainé, 25 
Isle of Man, Rev. J. Quine, 346 
Isothermal Layer, Commander Campbell Hepworth, 7 
Japan, Prehistoric, Dr. Neil G. Munro, 423 
Johns Hopkins University, Resignation of President, 223 
Jupiter: Rev. T. E. R. Phillips, 487; Prof. Barnard, 589 ; 
Herr Archenhold, 589; M. Quénisset, 617; Occultation 
of a Star by Jupiter, A. Burnet, 632 
Kala-Azar, Etiology of, Capt. W. S. Patton, I.M.S., 386 
Kamchatka and Aleutian Isles Expedition, Dr. W. Jochel- 
son, 301 : 
Kathode Rays: (1) Transmission of, through Matter, (2) 
Velocity of the Secondary Kathode Particles ejected by 
Réntgen Rays, R. Whiddington, 52; Experiments with 
Kathode Rays, Sir Wm. Ramsay, K.C.B., F.R.S., 502 
Kew Gardens Bulletin and Guide, 668 
Kew Observatory, 592 
Kinematograph : Gaumont Speaking Kinematograph Films, 
Prof. W. Stirling, 333 ; Kinematograph in Science Teach- 
ing, 410; L.C.C. Demonstration, 538; Kinematography 
of the Solar Eclipse, M. Lobo, 541; New Kinemato- 
graph, P. Nogués, 599 
King’s Birthday Honours, 403 
Krupp Establishments at Essen, 643 
Labrador: “Through Trackless Labrador,” H. Hesketh 
Prichard, 35 
Larvicides in Action, Surgeon-Captain F. F. MacCabe, 496 
Latitude Variation, Prof. Albrecht, 512; Dr. F. E. Ross, 
617 
Laughing Jackass (Dacelo), Taste or Smell in the, R. I. 
Pocock, F.R.S., 425 
Leaden Objects, Atmospheric Destruction, C. Matignon, 417 
Leeds University : New Textile Extension, 228 
Left-handedness, B. D. Ewald Stier, Prof. G. Elliot Smith, 
F.R.S., 108 
Leishmania donovani, Generalised Infection of Mice by, 
A. Laveran, 53 
Lepidoptera: Catalogue of the Noctuide in the British 
Museum, Sir G. F. Hampson, Bart., 374; Adams Collec- 
tion of Foreign Lepidoptera, 666 
Libraries, Coordinated Purchase of Periodicals in 
Newcastle, Basil Anderton, 61 
Life, Simplest Forms of, and their Origin on Earth, Prof. 
Minchin, 430 
Liffey Valley, G. A. J. Cole, 521 
Light : Optical Properties of Mercuric Iodide, T. V. Barker, 
78; Experimental Work on a New Standard of Light, 
W. A. Harwood and Dr. J. E. Petavel, 103; Refrakto- 
metrisches Hilfsbuch, Prof. W. A. Roth and Dr. F. 
Eisenlohr, 111; Chemical Effects of Light on Organic 
Compounds, Prof. Paternd, C. Maselli, L. Mascarelli, 
146; the Torque produced by a Beam. of Light in Oblique 
Refraction through a Glass Plate, Dr. Guy Barlow, 233; 
Flicker, Dr. T. C. Porter, 234; Stereoscopic Inversions 
due to Association of two Systems of Retinal Impres- 
sions, A. Chauveau, 235; Detection of small amounts of 
Polarisation in Light from a Cloudy Sky, A. E. Oxley, 
313, 669; Width of the Spectrum Lines and Production 
of Interference with Large Differences of Path, C. Fabry 
and H. Buisson, 313; Luminous Organs of Certain 
Insects, F. A. Macdermott, 331; a New Treatment of 
two 
Lndex 
XXvii 
Optical Aberration, Prof. R. A. Sampson, 363; Extinc- 
tion of Light by an Illuminated Retina, Sir W. de W. 
Abney, 363; Emission Velocities of Photo-electrons, A. 
Lil. Hughes, 415; Optical Science: Address, Prof. 
Silvanus P. Thompson, F.R.S., 436; Some Optical Ex- 
periments, H. S. Ryland, 555; Contrast Colours in the 
Use of Zone-plates, W. B. Croft, 581; Lichtgenuss in 
Forestry, 587; Outlines of Applied Optics, P. G. Nutting, 
603; Refraction and Magnetic Rotation of Mixtures, 
F. Schwers, 625; Artificial Daylight, Prof. W. M. 
Gardner, 631; Oersted and the Electric Theory of Light, 
Prof. Silvanus P. Thompson, F.R.S., 664 : 
Lighting : Principes de la Technique de |’Eclairage, Dr. L. 
Bloch, 3; Illumination of House of Commons, 351 
Luminous Efficiency of I]luminants, Mr. Dow, 354 
Linen, Action of Bleaching Agents on the Colouring Matter 
of, R. L. Taylor, 287 
Liquid Air, Prof. Zeeman, 93 
Liquids, Movements of Semi-oily, on a Water Surface, 
C. R. Darling, 416 
Lizard, Varieties of the Wall-, G. A. Boulenger, 364 
Load-extension Indicator, an Optical, Prof. W. E. Dalby, 52 
Lobsters : Natural History of the American Lobster, F. H. 
Herrick, 9; Lobsters in the A®gean, Prof. D’Arcy 
Thompson. C.B., 321; Dr. W. T. Calman, 529 
Locomotive, the Modern, C. Edgar Allen, 111 
Locust Diseases, Propagation in Argentina of Mexican, 
F. d’Herelle, 53 
Logarithmic Tables: Tables of Logarithms and Anti- 
logarithms to Five Places, E. E. Scott, 318; Tables of 
Logarithms and Anti-logarithms to Four Places, Major- 
General J. C. Hannyngton, 318; Four Place Tables of 
Logarithms and Trigonometric Functions, Prof. E. V. 
Huntington, 318 
London: London Institution (Transfer) Bill, 274; East 
London, G. F. Bosworth, 346; London Health Com- 
mittee, Proposed Central, 537; London University New 
Site, 546; London County Council Lectures for Teachers, 
573; Roman London, Prof. F. Haverfield, 614 
Mackerel Feeding Habits, G. E. Bullen, 641 
Magnetic Charts: Magnetic Declination Chart : U.S. Coast 
and Geodetic Survey, 175; Magnetic Charts of the Indian 
Ocean, Dr. L. A. Bauer, 335 
Magnetic Double Refraction, New Substances showing, 
A. Cotton and H. Mouton, 183 
Magnetic Rotation of Mixtures, Refraction and, P. T. 
Miller and Mlle. V. Guerdjikoff, 25 
Magnetisation: Self-demagnetisation of Steel, S. W. J. 
Smith and J. Guild, 546; Magnetisation of Iron: Con- 
stant P of Frohlich’s Equation, Dr. J. R. Ashworth, 616 
Magnetism: Magnetic Properties of Solid Oxygen, Glass, 
and Anhydrous Ferrous Sulphate at Low Temperatures, 
Prof. Onnes and Dr. Perrier, 41; Molecular Theory of 
Magnetism in Solids, Prof. W. Peddie, 53; Magnetic 
Influence in the Solar Rays, Sam. Hunter Christie, A. 
Naccari, 93; Transverse Induction Changes in De- 
magnetised Iron and the Molecular Theory of Magnetism, 
J. Russell, 131; Diffusion and Mobility of Ions in a 
Magnetic Field, J. S. Townsend, 233; Effect of 
Magnetism on Rates of Chronometers, T. Lewis and S. 
Chapman, 312; Curie’s Constant in the Ferromagnetic 
State, J. R. Ashworth, 503 
Magnetism, Terrestrial: Graphic Representation of the 
Hourly Magnetic Character of the latter half of 1911, 
Prof. Bidlingmaier, 146; Magnetic Survey of Egypt, 199; 
U.S. Coast and Geodetic Survey, 276; Phenomena of Sun- 
spots and Terrestrial Magnetism at Kew, Dr. C. Chree, 
285; Magnetic Declination Tables for Atlantic, 616; see 
also Magnetic Charts 
Magnetochemie, Prof. E. Wedekind, 528 
Malaria in India, Sir Ronald Ross, K.C.B., F.R.S., 505 
Mammal Surveys, Four, 178 
Man: Ancient Types of Man, Prof. A. Keith, 375; In- 
tensity of Natural Selection in Man, Prof. K. Pearson, 
F.R.S., 494 
Manchester : Manchester University, Extension of Physical 
Laboratories, 46; Manchester Oriental Society, 196; 
Manchester Microscopical Society: Extension Lectures, 
651 
