vom Standpunkte des Physikers, Dr. Gustav Eichhorn, 361 Vernon (Dr. H. M.), Elemente der exakten Erblichkeitslehre, W. Johannsen, 424 Verrill (Prof. A. E.), Star-fishes of Alaska and British Columbia, 402 Vertebrates, the Central Nervous System of, J. B. Johnston, Prof. John G. McKendrick, F.R.S., 274 Very (Prof.), Quantitative Measures of the Oxygen Bands in the Spectrum of Mars, 529 Viguer (P. L.), the Ethyl Acetal of Tetrolic Aldehyde, 239 Vinal (G. W.), Phenomena Exhibited by Electric Arcs between Metal Electrodes, 297 Vinci (Léonard de), Études sur,. ceux qu'il a lus et ceux qui l'ont lu, Pierre Duhem, 2 Viticulture: Phylloxera vastatrix in the Transvaal, 107 Vögelstimmen, Excursionsbuch zum Studien der, Prof. Voigt, 365 Voigt (Prof.), Excursionsbuch stimmen, 365 um Studien der Vögel Voigt (Dr. Woldemar), Magneto- und Elektro-optik, 185 Volcanic Origin of Coal and Modern Geological Theories, the, Col. A. T. Fraser, 246 Volcanoes, Nature and Origin of the Gases which Form in Volcanic Fumeroles and Craters of old, Armand Gautier, 120 Volkmann (Paul), Materialistische Epoche und monistische Bewegung, 361 Volumetric Analysis, a Manual of, Dr. H. W. Schimpf, 364 Vos (George H.), Birds and their Nests and Eggs, found in and near Great Towns, 100 Vredenburg (E.), Mining Administration in India, 219 Wager (Dr. A.), Water Contents of Clouds, 198 Wager (Harold), Nucleus of the Yeast Plant, 537; Perception of Light in Plants, 538 Wales, North, Orthite in, Herbert H. Thomas, 487 Walker (Dr.) Meteorological Conditions prevailing before the South-west Monsoon of 1909, 137 Walker (H.), Mining Administration in India, 219 Walker's (J. F.) Collection of Fossil Brachiopoda presented to British Museum, 165 Walker-Tisdale (C. W.), Milk Testing, 187 Wallace (Dr. W.), Size and Age of Plaice at Maturity, 492 Waller (Dr.), Report of the Committee on Anæsthetics, 507; Effect of Local Heat on Vegetable and Animal Tissues, 508 Waller (Prof. T. L.), Rare Metals of Canada, 447 Wang (Chung Yu), Antimony: its History, Chemistry, Watch Dial and Military Night Compass, Permanently Water the National Consumption of Water, W. R. B. Water Finder, the Mansfield Automatic, A. A. Campbell Watson (W.), Current and Temperature Observations in Watt (Henry J.), the Economy and Training of Memory, 158 Webb (H. W.), Lengths of the Waves Emitted by Generators of Short Electric Waves, 435 Weber (Dr. E.), Liquefaction of Clay by Alkalis and Use of Fluid Clay Casting in the Ceramic Industry, 375 Webster (Dr.), Use of Atropine in Conjunction with Anæsthetics, 507 Wedderburn (E. M.), Current and Temperature Observa tions in Loch Ness, 148; Pettersson's Observations on Deep-water Oscillations, 148; Deep-water Oscillations, 403 Weights and Measures, Report of International Committee of, 199 Wellisch (E. M.), Passage of Electricity through Gaseous Mixtures, 27 Welsford (Miss E. J.), Life-history of Trichodiscus elegans, 538 Weltalls, der Bau des, Prof. Dr. J. Scheiner, 36 West (George), Dominant Phanerogamic and Higher Whiskey Commission, the, 308 Whitby (G. S.), Species Pilotite and the Analysis of a Specimen from China, 28 White (Dr. Charles), Municipal Management of Tuberculosis, 496 White (Gilbert) and Selborne, Henry C. Shelley, 334 White (Sir W. H., K.C.B., Sc.D., LL.D., F.R.S.), Opening Address in Section G at the Meeting of the British Association at Winnipeg, 342 Whitelegge (Dr.), Relation of Health to Industry, 141 Whitson (Mr.), Importance of Phosphates in Fertility, 205 Wild Beasts of the World, Frank Finn, 332 Wild (L. W.), Comparative Merits of Photometers of Various Types, 169 Wilde (Dr. H.), New Binary Progression of the Planetary Williams (C. B.), the Pitcairn Islanders, 518 Willstätter (Prof. R.), Chemistry of the Chlorophyll, 538 Wilson (Dr. Andrew), Physiology: a Popular Account of the Functions of the Human Body, 455 Wilson (E.), Effect of Previous Magnetic History on Magnetisation, 28 Wilson (Prof. H. A.), Electric Induction through Solid Insulators, 26; Effect of a Magnetic Field on the Electrical Conductivity of Flame, 56 Wilson (Prof. J.), the Feeding of Stock, 476; History of the Aberdeen-Angus Breed of Cattle, 536 Wilson (W.), Absorption of Homogeneous B Rays by Matter and on the Variation of the Absorption of the Rays with Velocity, 58 Wimperis (H. E.). Recent Improvements in the Internalcombustion Engine, 171, 201, 234 Wind, the Force of the, Prof. Herbert Chatley, 366 Winnecke's Comet, Search-ephemeris for, C. Hillebrand, 465 Winnipeg, British Association Meeting at, 75, 278 Wireless Telegraphy: Cable Rates and Press Intercom- Witt (Prof. Otto N.), Evolution and Applied Chemistry, November 25, 1909. Address at Seventh International Congress of Applied Chemistry, 51 Wittmack (Herr), Tuber-bearing species of Solanum, 379 Wolf (Prof. Max), Halley's Comet Re-discovered, 355; Observations of Perrine's Comet, 1909b, 376; Observations of Halley's Comet, 1909c, 404; a Newly-discovered Nebula Cluster in Cetus, 436 Wologdine (M.), Ordinary Carbon, 59 Woodman (L. E.), Lengths of the Waves Emitted by Worcestershire, the Botany of, J. Amphlett and Carleton Woronichin (N. N.), Distribution of the Alga in the Black Sea, 44 Wright (Sir A. E., F.R.S.), Studies on Immunisation and their Application to Diagnosis and Treatment of Bacterial Infections, 362 Wright (Herbert), Hevea brasiliensis or Para Rubber, its Wych Elm Seedlings, Rosamund F. Shove, 99 of the Markings on Jupiter in 1888, A. Stanley Williams, 125 Zierpflanzen, Unsere, P. F. F. Schulz, 451 Zijlstra (Dr.), Investigation of the Medullary Rays in the Zoology Guide to the Whales, Porpoises, and Dolphins Zulus, Materia Medica among the, Father A. T. Bryant, 298 THE "LONDON" MICROSCOPE, A New Form for Research Work. [PRICE SIXPENCE SECOND-HAND PRISM FIELD GLASSES ZEISS, In perfect con- CLARKSON'S Second-hand Optical Mart, 338 HIGH HOLBORN, LONDON, W.C. (Opposite Gray's Inn Road.) Negretti & Zambra's SELF-RECORDING (THE RECENT MODEL.) Meteorological Slow motion four times finer than usual. Swing-out centring and focussing substage. Iris diaphragm in stage level with surface. Finder divisions to mechanical stage, &c. CANTOR LECTURES By CONRAD BECK on the Theory of the Instruments. The STANDARD RECORDING (Halliwell's Patent), In Improved Copper Case. Full particulars on application to the NEGRETTI & ZAMBRA, R. & J. BECK, LTD., Branches: 68 CORNHILL, E.C. 45 CORNHILL, E.C. NOTICE. 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