The Poetry of Science; or, Studies of the Physical Phenomena of Nature

by Robert Hunt

• Absorption of heat by air, water, and earth, [74].
• —— of light, [125].
• Acalephæ, or phosphorescent animals, [387].
• Actinism, [166].
• —— producing chemical change, [174].
• —— and light antagonistic, [177].
• ——, influence of, on plants, [372].
• Action of presence—Catalysis, [280].
• “Active principles” of Newton, [11].
• Adams on planet Neptune, [32].
• Adiathermic bodies, [95].
• Aërial currents dependent on heat, [80].
• —— chemical, [274].
• Affinity, [292].
• Age of the world, [404].
• Aggregation, attraction of, [48].
• ——, crystalline, [58].
• Agonic lines, [244].
• Air, absorption of heat by, [74].
• —— density of the, [319].
• Alchemy, Nature’s, [293].
• Aldini on animal electricity, [393].
• Allotropic conditions of atoms, [43].
• Allotropism, [330].
• Allotropy, [291].
• Alum, opacity to heat rays, [65].
• Alpinus’ theory of matter, [47].
• Ammonites of the lias, [341].
• Ammoniacal amalgam, [325].
• Ampère’s theory of magnetism, [239].
• Analogy, dangers of reasoning by, [152].
• Ancients’ knowledge of magnetism, [235].
• Animals, phosphorescence of, [154].
• —— respiration of, [310].
• —— articulated, [388].
• Animal magnetism, [267].
• —— electricity, [211], [392].
• —— life, progress of, [338].
• ——, phenomena of, [383].
• Arago on the surface of the sun, [123].
• —— on copying the Egyptian temples, [177].
• —— on magnetic variation, [246].
• Arbor Dianæ—silver tree, [261].
• Aristotle on motion, [10].
• Atmosphere, uses of the, [319].
• Atmospheric refraction, [322].
• Atomic theory, [278].
• —— volumes, [287].
• Atoms, allotropic state of, [43].
• Atom, the organic, [360].
• ——, ultimate size of, [408].
• ——, the, and its powers, [3].
• Attraction, chemical, [275].
• Aurora of the sun, [186].
• Back’s account of Aurora, [249].
• Balance of forces, [14].
• Bartholin on Iceland spar, [140].
• Beccaria, Father, on phosphorescence, [160].
• Becquerel’s experiments on electricity, [227].
• —— on ozone, [300].
• Bell on the nerves, [391].
• Belemnites, [341].
• Berkeley, Bishop, on motion, [10].
• Berzelius on allotropy, [44].
• —— on catalysis, [281].
• Biela’s comet, [26].
• Biot on polarization, [145].
• Bolognian stone, [161].
• Bouguer on the absorption of light by the atmosphere, [126].
• Boutigny on heat, [107].
• Boletus igniarius, [102].
• Boyle on motion, [9].
• Brain and nerves, [391].
• Brahminical philosophy, [245].
• Brewster, Sir D., refers magnetism to the sun, [263].
• —— on magnetism, [247].
• Brown’s doctrines of life, [395].
• Butterfly, metamorphosis of, [389].
• Cagniard de la Tour state, [106].
• Calorific transparency, [65].
• —— influence on plants, [376].
• Calotype, the, [174].
• Canton’s phosphorus, [161].
• Carbon, allotropic state of, [43].
• Carboniferous plants, fossil, [339].
• Carbonic acid, solid, [111].
• —— quantity in atmosphere, [311].
• Cassini on magnetic variation, [246].
• Catalysis, [280].
• Cell, organic, [361].
• Cellini, Benvenuto, on the carbuncle, [159].
• Central sun, doctrine of a, [27].
• Changes, physical, [290].
• Chemical phenomena developing heat, [42].
• —— decomposition producing heat, [97].
• —— combination by heat, [98].
• —— affinity suspended by heat, [109].
• —— radiations, [166].
• —— power of solar rays in the Tropics, [177].
• —— agency of luminous rays, [178].
• —— action influenced by magnetism, [252].
• —— forces, [270].
• —— elements, [272].
• —— proportions, [285].
• —— metamorphoses, [289].
• —— phenomena, [295].
• —— composition of atmosphere, [322].
• —— rays, action of, on germination, [375].
• Chemistry, Electro, [206].
• —— of Nature, [270].
• —— Animal, [396].
• Chinese knowledge of magnet, [236].
• Chlorophylle, formation of, [373].
• Chloride of sulphur, transparency of, to heat, [65].
• Chlorine and hydrogen combine by light, [171].
• Chlorine in the ocean, [303].
• Cholera and electricity, [215].
• Choroid coat, the, [149].
• Chromatic lines on the earth, [133].
• Clay converted into slate by electricity, [227].
• Climate of the earth, [350].
• Clock, Electrical, [233].
• Coal formation, theory of, [314].
• Cohesive force opposed to gravitation, [33].
• Cohesion and gravitation, [49].
• —— distinguished from crystallization, [51].
• Cold, extreme, [110].
• Colour of bodies, [132].
• —— changes of, in chemical combinations, [290].
• —— blue, of sky, [320].
• —— of steam, [321].
• Colours, Newton’s theory of, [135].
• Coloured heat rays, [85].
• Combining equivalents, [273].
• —— forces, [292].
• Combination, laws of, [286].
• —— of forces, [330].
• Combustion, [305].
• Comets, [26].
• Condensation of gases, [290].
• Conduction of heat, [69].
• Conducting power of bodies for heat, [89].
• Condition, change of chemical, [271].
• Conversion of motion, [16].
• Convection of heat, [69].
• Cotyledons, use of the, [368].
• Coulomb on repulsion of atoms, [47].
• Creation, oneness of, [406].
• Cretaceous formations, [344].
• Crosse on electricity, [227].
• Crustaceans, metamorphosis of, [389].
• Crust of the earth, [333].
• Crystals, pseudomorphous, [54].
• ——, size of, [56].
• Crystallogenic forces, [50].
• Crystalline bodies, magnetic influence of, [260].
• Cudworth’s “Plastic Nature,” [10].
• Current, electric, speed of, [231].
• ——, electricity, magnetic, [239].
• Crystallization, [50].
• Cultivation, limits of, [379].
• Currents of electricity around the earth, [224].
• Cyanite, a true magnet, [48].
• Daguerre’s discovery, [170].
• Daguerreotype, the, [172].
• Dalton on Aurora Borealis, [248].
• —— on liquefaction, [287].
• Dalton’s atomic theory, [278].
• Daniel on incandescence, [100].
• Dark lines of spectrum, [125].
• Darwin on sea-weeds of the Southern Ocean, [316].
• Davy, Sir H., on the elements, [328].
• —— on flame, [307].
• —— discovers the alkaline metals, [325].
• Decomposition, electro-chemical, [208].
• De la Tour, Cagniard’s experiments, [105].
• Delaroche on heat, [93].
• Density of the earth, [31].
• Development, animal, [384].
• Dew, formation of, [81].
• Diamond, allotropic carbon, [43].
• ——, phosphorescence of, [160].
• Diamagnetism, [253].
• Diamagnetic nature of gases, [259].
• Diathermic bodies, [94].
• Diffusion of gases, [323].
• Digestion a cause of heat, [105].
• Dip of magnetic needle, [247].
• Dimorphism in crystals, [55].
• Directive power of a magnet on crystals, [261].
• Distribution of elements, [328].
• Divisibility of matter, [38].
• Döbereiner’s lamp, [281].
• Dispersion of light, [129].
• Draper on incandescence, [100].
• Dumas on atoms, [39].
• Dust, a grain of, [2].
• Earth, physical, the, [1].
• —— density of, [31].
• —— the revolution of the, [77].
• ——, geological formation of, [333].
• Earth’s, motion, [11].
• —— temperature dependent on the sun, [63].
• Effects produced by loss of heat, [69].
• Eggs, number of, laid by insects, [399].
• Elective affinity, [292].
• Electricity, [193].
• Electricity and light influencing crystallization, [57].
• ——, kinds of, [195].
• —— contained in water, [203].
• —— developed by chemical action, [204].
• ——, velocity of, [231].
• —— of plants, [380].
• Electric condition of matter, [5].
• —— telegraph, the, [231].
• —— affinity, [275].
• Electrical phosphorescence, [160].
• —— action influenced by actinism, [183].
• —— radiations, [190].
• —— clock, [233].
• Electro-chemistry, [206].
• Electro culture, [223].
• Electrotype, the, [229].
• Electro-chemical decomposition, [208].
• Electro-magnetism, [240].
• Electrum, [193].
• Elements, chemical, [37], [272].
• ——, atmospheric, [325].
• ——, interchanges of, [319].
• Englefield on heat rays, [67].
• Eocene formations, [346].
• Equinoxes, precession of the, [244].
• ——, the vernal and autumnal, [77].
• Epicurus’ hooked atoms, [48].
• Epipolic phenomena, [129].
• Eremacausis, [105].
• Ether, hypothesis of an, [120].
• Examples of crystallization, [59].
• Expansion of bodies by heat, [96].
• Eye, mechanism of, [149].
• Faraday on Magnetism of Crystals, [59].
• —— on solidification of gases, [112].
• —— on magnetization of light, [147].
• —— on the gymnotus, [211].
• —— on diamagnetism, [254].
• Ferro-magnetic bodies, [255].
• Fish Lizard, the, [341].
• Fixed stars, light of, [122].
• Flint glass, permeability to heat, [65].
• Flora, fossil, [345].
• Flowers, influences of, [317].
• Fluid, magnetic theory of, [252].
• Fluorescence of light, [130].
• Forbes, Prof. Jas., on vibrations of heated metals, [97].
• Forbes, Prof. Edward, on zones of life in the ocean, [127].
• Forbes on colour of steam, [321].
• Force producing motion, [9].
• —— a cause of motion, [17].
• ——, molecular, [40].
• —— of crystallization, [61].
• Forces, active, in matter, [3].
• ——, balance of, [14].
• —— in antagonism, [407].
• Form, change of, [2].
• —— of surface, influence of, on climate, [351].
• ——, variety of vegetable, [359].
• Foster describes Northern Lights, [249].
• Fox, R. W., on temperature of Cornish mines, [91].
• Franklin on atoms, [47].
• Franklin’s kite experiment, [214].
• Freezing mixtures, [110].
• Freezing, remarkable phenomena of, [112].
• —— of water, [302].
• Friction, [17].
• Frictional electricity, [199].
• Fraunhofer’s dark lines, [125].
• Franklin’s experiment on heat, [75].
• Fusion influenced by pressure, [107].
• Galvanism, [201].
• Galvani’s experiment, [201].
• Gases, condensation of, [111], [290].
• ——, magnetism of, [259].
• Gaseous constitution, [317].
• Gauss’s theory of magnetism, [243].
• Generation, spontaneous, [363].
• Geological phenomena, [332].
• Germ, Treviranus on the, [361].
• Germination of seeds, [367].
• Glass, coloured, transparency to heat, [65].
• Goethe’s theory of colour, [139].
• Goethe on phosphorescence, [157].
• —— on the leaf, [369].
• Graham’s law of diffusion, [323].
• Gravitation, [21].
• Growth explained, [52].
• ——, progress of, [364].
• —— defined, [383].
• Grove decomposes water by heat, [98].
• Gulf stream, the, [81].
• Gulielmini on crystallisation, [50].
• Gun cotton, [103].
• Gymnotus electricus, [211].
• Gyroscope, the, [14].
• Hansteen and Arago on Northern Lights, [248].
• Hansteen on magnetism, [244].
• Heat, solar and terrestrial, [62].
• ——, conductors of, [90].
• ——, rays absorbed by atmosphere, [63], [73].
• —— and light, their relations, [64].
• ——, radiation of, [82].
• —— rays, coloured, [85].
• —— lessens chemical affinity, [88].
• ——, latent, [101].
• ——, decomposition by, [109], [276].
• ——, scientific knowledge of, [114].
• —— developed by combustion of wood equivalent to heat absorbed in growth, [116].
• ——, influence of, on magnetism, [241].
• ——, action of, on water, [302].
• ——, influence of on plants, [371].
• —— essential to life, [395].
• Heliography of M. Niepce, [170].
• Herbivorous animals, [315].
• Herschel on the nebulæ, [24].
• Herschel, Sir W., on heat rays, [67].
• Hobbes on the properties of matter, [8].
• Hopkins on the temperature of fusion, [107].
• Huyghens on double refraction, [140].
• Hydra, the, [387].
• Hydrogen, peroxide of, [298].
• —— and oxygen, [289], [297].
• Hydro-carbons, [297].
• Hydro-carbon compounds, [308].
• Hypnotism, Mr. Braid on, [269].
• Ice, [301].
• Ichthyosaurus, the, [341].
• Igneous rocks, [335].
• Ignition by chemical action, [102].
• Iguanodon, the, [343].
• Incandescence, temperature of, 69–100.
• Influences of matter on heat, [79].
• Infusoria and animalculæ, [387].
• Interference of light, [138].
• Intensity, magnetic, [247].
• Invisible light, Moser on, [188].
• Iodide of silver found natural, [304].
• Iodine, [304].
• Iridescent paper, [137].
• Iron, magnetic, [235].
• ——, soft, rendered magnetic, [241].
• ——, rusting, [306].
• Isomeric compounds, [291].
• Isomorphism, [290].
• Isothermic lines, [92].
• Isodynamic lines, [247].
• Jones, Rymer, on sponges, [345].
• Joule on anhydrous salts, [287].
• —— on heat and motion, [18].
• Kircher’s Magnetism, [264].
• Kupffar on magnetic storms, [249].
• Lamination of clay by electricity, [226].
• Land and sea, alternations of, [340].
• Laplace’s theory of the universe, [23].
• Latent heat, [101].
• Lavoisier’s theory of combustion, [305].
• Law of gravitation, [30].
• Lawson, letter from Mr., on germination of seeds, [375].
• Leaf, the functions of the, [369].
• Leaves of plants, action on air of, [311].
• Le Verrier on planet Neptune, [32].
• Leyden jar, the, [198].
• Lias formations, [341].
• Liebig and organic chemistry, [284].
• Life and light, [52].
• ——, influence of light on, [153].
• —— dependent on light, [164].
• ——, vegetable, [362].
• ——, mysteries of, [398].
• Light, [118].
• —— essential to life, [39].
• —— of fixed stars, [122].
• ——, transparency to, [124].
• ——, transmission of, through different media, [128].
• ——, absorption of, [125].
• ——, interference of, [138].
• ——, polarized condition of, [141].
• ——, magnetization of, [146].
• ——, artificial, [162].
• ——, influence of, on plants, [373].
• —— and heat, correlation of, [64].
• Lightning conductors, [215].
• Lindley on the leaf, [370].
• Lubbock, Sir J., on shooting stars, [22].
• Lodes, mineral, electricity of, [225].
• Luminous and actinic rays distinguished, [176].
• Machine electricity, [209].
• Magellanic clouds, [25].
• Magnetic curves, [236].
• —— iron ore, [237].
• —— polarity, [237].
• —— points of convergence, [244].
• —— poles of the earth, [245].
• —— intensity, 247
• —— storms, [249].
• —— lines of no variation, [243].
• Magnetism, [235].
• —— induced, [238].
• —— influenced by heat, [242].
• ——, universality of, [253].
• —— of gases, [259].
• —— induced by solar rays [263].
• —— and electricity, correlation of, [239].
• —— and crystallisation, [57].
• Magneto-electrical decomposition, [230].
• Magnetisation of light, [146].
• Malus on polarisation, [139].
• Mammalia, fossil, [343].
• Man, temperature of, [105].
• Manganesiate of potash, [171].
• Mantell, Dr., on the iguanodon, [343].
• Mariotte on seat of vision, [149].
• Matter, its general conditions, [1].
• ——, forms of, [21].
• ——, transmutation of, [37].
• ——, divisibility of, [38].
• ——, solid, absorption of heat by, [75].
• ——, influence of, on light, [162].
• ——, polarity of, [265].
• —— and its properties, [409].
• ——, entity of, [410].
• ——, varied condition of, [36].
• Mayer’s hypothesis of three colours, [138].
• Mechanical force and heat, [103].
• Mechanism of the eye, [149].
• Media, influence of, on light, [128].
• Medusæ, phosphorescence of, [159].
• Melloni on coloured heat rays, [85].
• —— on new nomenclature for heat, [95].
• Mesmer and electricity, [222].
• Metamorphic rocks, [336].
• Metamorphoses of animals, [389].
• Mexico, Gulf of, warmth of the, [81].
• Mica, black, transparency to heat, [66].
• Miller, Dr., on dark lines of the spectrum, [126].
• Mineral veins, electricity of, [225].
• Mines, Cornish, temperature of, [91].
• Miocene formations, [346].
• Mirrors, magic, [191].
• Mitscherlich on expansion of crystals by heat, [257].
• Molecular forces, [35], [40].
• ——, compound action of, [279].
• Molecules, Dumas on, [39].
• —— combination, [277].
• Morichini and Carpi on magnetism of violet rays of light, [263].
• Moser on invisible light, [189].
• Motion, [7].
• —— a property of matter, [8].
• ——, principles of, [10].
• —— of the earth, [12].
• —— round an axis shows the earth’s motion, [18].
• ——, influence of, on form, [32].
• Mountain ranges probably determined by magnetic force, [262].
• Multiplication of life, [399].
• Musical notes produced by heat, [97].
• Muscular contraction by electricity, [202].
• Musschenbroek of Leyden, [198].
• Mythology, ancient, probable origin of, [353].
• Natural polarization, [145].
• Nebulous state of matter, [23].
• Neptune, discovery of, [32].
• Newton on gravitating force, [49].
• Newton on motion, [9].
• Newton’s hypothesis of matter, [4].
• —— theory of heat, [115].
• —— theory of light, [120].
• —— theory of colours, [135].
• Niepce on the chemical radiations, [168].
• Nitrogen, magnetic neutrality of, [259].
• ——, combinations of, [324].
• ——, supposed metallic nature of, [325].
• Nocturnal radiation, [83].
• Northern lights, the, [268].
• Obsidian transparency to heat, [66].
• Ocean, waters of, [303].
• Oersted discovers electro-magnetism, [238].
• Orders of animals, [386].
• Organic creation, influence, [185].
• —— compounds, [283].
• —— compounds, influence of light on them, [181].
• —— chemistry, [331].
• —— cell, [360].
• —— remains, [337].
• Organized forms, varieties of, [35].
• —— bodies, heat of, [104].
• Organization, progress of, [385].
• Oxides, metallic, [326].
• Oxidizable metals, [305].
• Oxygen gas magnetic, [259].
• —— and nitrogen, uses of, [321].
• —— and carbon in animals, [396].
• Ozone, [299].
• —— and electricity, [217].
• Palladium maintaining slow combustion, [309].
• Parathermic rays, [74].
• —— rays, influence in nature, [377].
• Particles, Dumas on, [39].
• Peach on phosphorescence of the sea, [159].
• Pearsall on phosphorescence, [160].
• Pendulum, oscillation of, indicates the earth’s motion, [13].
• Perkins on repulsion of heat, [108].
• Permeation of heat, [96].
• Perturbations of Uranus, [31].
• Pestilential diseases, [216].
• Phenomena of vision, [148].
• ——, natural, of electricity, [194].
• ——, recent geological, [349].
• Phosphorescence of animals, [154].
• —— of plants, [156].
• Phosphorescent spectrum, [184].
• Phosphoric acid detected in the oldest rocks, [337].
• Photosphere of the sun, [123].
• Photography, [170].
• ——, its importance, [180].
• Physiological influences of electricity, [219].
• Physical forces, action of, [4], [45].
• —— forces, modes of motion, [7].
• —— properties of polarized light, [142].
• Physiological influences of magnetism, [268].
• Pilchard, on the, by Couch, [315].
• Plants, distribution of, dependent on light, [133].
• ——, phosphorescence of, [156].
• ——, respiration of, [312].
• —— and animals, dependence of, [313].
• ——, growth of, [368].
• —— bend to the light, [373].
• ——, distribution of, [378].
• —— of the Tropics, [381].
• Plane polarization, [141].
• “Plastic nature” of Cudworth, [10].
• Plateau’s experiment on bodies relieved from gravitation, [33].
• Platinum maintaining slow combustion, [309].
• Plato on motion, [10].
• —— on light, [119].
• Plesiosaurus, the, [341].
• Pliocene formations, [346].
• Plücker on crystallo-magnetic force, [57].
• —— on diamagnetic bodies, [256].
• Plumule, use of, [369].
• Plutonic rocks, [334].
• Polarization, circular and elliptical, [143].
• Polarization of light, [139].
• Polar condition of matter, [265].
• Polypes and infusoria, [387].
• Porosity of matter, [41].
• Porta, Baptista—camera obscura, [149].
• Powers, active, in nature, [405].
• Prevost, theory of, on heat, [96].
• Primary origin of our planet, [334].
• Principles of motion, [10].
• Prismatic refraction, [121].
• —— rays, heat of, [67].
• —— analysis of sunbeam, [134].
• Principle of gravitation, [29].
• ——, elementary, [38].
• Properties, essential, of matter, [5].
• Pseudomorphism, [54].
• Psychology of flowers, [357].
• Pterodactyl, the, [342].
• Pythagorean doctrine of motion, [10].
• Quinine, solution, influence of, on light, [129].
• Radiant heat, [69].
• Radiation and absorption of heat, [77].
• ——, nocturnal, [83].
• Raia torpedo, [211].
• Raymond, Du Bois, on animal electricity, [221].
• Refrangibility, rays of high, [130].
• —— of solar forces, [168].
• Refraction, prismatic, [121].
• Races, dependence of, [315].
• Repulsion of heat, [108].
• Respiration of animals, [310].
• —— plants, [312].
• Rest, absolute and relative, [15].
• Respiration a cause of heat, [105].
• Retina, the, [149].
• Revelations of nature, [401].
• Revolution of magnetic poles, [246].
• Robinson on decomposition by heat, [98].
• Rock formations, [335].
• Rocks, conducting power of, [224].
• Rosse’s, Lord, telescopes, [25].
• Rumford, Count, experiments on heat, [18].
• —— on chemical properties of light, [99].
• Rings, Newton’s, [137].
• Safety lamp of Davy, [309].
• Salt rock, transparency to heat, [65].
• Saturn’s ring explained, [34].
• Savart on vibrating plates, [257].
• Seasons, influence of heat on the, [70].
• Sea, phosphorescence of, [158].
• Schönbein on ozone, [299].
• Schwabe on solar spots, [243].
• Seebeck on thermo-electricity, [211], [248].
• Selenite and alabaster, [60].
• Sénarmont on conducting power of crystals for heat, [257].
• Shooting stars, [21].
• Silicon, allotropic state of, [43].
• Silica, substitution of, [345].
• Simple bodies, chemical, [329].
• Sky of tropical climes, [319].
• Slow combustion in animals, [397].
• Smee on electricity and vitality, [219].
• Solar system, motion of, [11].
• —— disc, light from, [185].
• —— influence on magnetism, [263].
• Solidification of gases by Faraday, [112].
• Solstices, summer and winter, [77].
• Solar spots connected with magnetism, [243].
• Solar phosphori, [161].
• Somerville, Mrs., magnetises needles by light, [263].
• Sound and light, analogy of, [151].
• Spectra produced by polarization of light, [144].
• Spectrum, dark lines of, [125].
• Spheroidal condition of fluids, [107].
• Spontaneous ignition, [307].
• Stahl on phlogiston, [305].
• Stars, shooting, theories of, [21].
• Steel ornaments incandescent, [137].
• Stereoscope, the, [151].
• Stokes, Prof., on fluorescence, [130].
• Stratified formations, [334].
• Strength of animals, [400].
• Structure, influence of, on magnetism, [256].
• ——, relation of, to physical phenomena, [257].
• Struvé on motion of solar system, [12].
• Substitution, chemical, [279].
• ——, law of, [288].
• Substances, all, electric, [197].
• Subterranean temperature, [91].
• Sulphuric acid, permeability to heat, [65].
• Surfaces, action of, [282].
• Sulzar on galvanism, [201].
• Sulphuretted hydrogen, solid, [111].
• Sun, the central, [28].
• ——, the source of light, [121].
• ——, physical state of the, [123].
• ——, a magnetic centre, [265].
• Tadpole, metamorphosis of, [389].
• Talbot’s sensitive photographic process, [178].
• Telegraph, electric, [231].
• Temperature of incandescence, [68].
• Temperature, subterranean, [91].
• Terrestrial currents of electricity, [224].
• —— magnetism, [255].
• Thales of Miletus discovers electricity, [193].
• Theories of light, [86], [118].
• Thermography, [188].
• Thermometric examination of the temperature of flowers, [76].
• Thermo-electricity, [209].
• Theory of motion producing force, [15].
• Thilorier on solid carbonic acid, [111].
• Time, influence of, [332].
• Tissues, catalytic power of, [310].
• Tourmaline, action of, on light, [142].
• Trade winds, [81].
• Transition series of rocks, [336].
• Transparency, calorific, [67].
• ——, luminous, [124].
• Transmutation of matter, [37].
• Transmission of light, [128].
• Transcalescent bodies, [94].
• Trevelyan, Mr., on vibration of heated metals, [97].
• Tyndale proves the influence of structure on magnetism, [258].
• Type, elements of the organic, [289].
• Undulations producing colour, [131].
• Undulatory theory of heat, [115].
• —— theory of light, [121].
• Uranus, discovery of, [31].
• Uranium glass, influence of, on light, [129].
• Vapour, elastic force of, [318].
• Variation, magnetic, [244].
• Vegetables conductors of electricity, [379].
• Vegetable life, phenomena of, [357].
• Vegetation of carboniferous epoch, [339].
• Velocity of electricity, [231].
• Vertebrate animals, [390].
• Vision, phenomena of, [148].
• Vis vitæ, vital principle, [391].
• Vision single with a pair of eyes, [150].
• Vitality superior to physical force, [53].
• Vision, seat of, [149].
• Volume, doctrine of, [287].
• Volcanic action referred to chemical action, [271].
• Volatilization of matter, [27].
• Voltaic electricity, [201].
• Water, absorption of heat by, [74].
• —— frozen free of air, [112].
• —— free of air, peculiar state of, [113].
• ——, electricity in a drop of, [204].
• ——, composition of, [296].
• Wargentin’s notice of aurora, [248].
• Wave movement of heat and light, [68].
• Wealden formations, [343].
• Wedgwood on incandescence, [100].
• Wells, Dr., on dew, [84].
• Wiedemann on electrical vibrations, [257].
• Wenzel’s proportional numbers, [277].
• Winds dependent on heat, [80].
• Wollaston notices dark lines in spectrum, [125].
• World, its age, [404].
• Young on molecular forces, [49].
• Zodiacal light, [25].
• Zoophytes, microscopic, [387].

THE END.

Wilson and Ogilvy, 57, Skinner Street, Snowhill, London.

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