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34 LIGHT 242 Tourmalin pincette. 243 Norrenberg’s polariscope arranged for con- vergent light. 844 rPolari-microscope. (Hoffmann). 245 Phenomena of uniaxal crystal by convergent light. . 346 Explanation of rings and cross. No. 1. 247 Explanation af rings and cross. No. 2. 248 Phenomena of biaxal crystal by convergent light. No. 1. 249 .Phenomena of biaxal crystal b 7 convergent light. No. 2. » 260 Lemniscate. 251 Measurement of angle of optic 262 Table of angles of optic axes. 263 Dispersion of optic axes. No. 1. 254 Dispersion of optic axes. No. 2. 256 Phenomena of quartz plate in polarised light. 256 Diagram of succession of colours on rotating quartz plate. 257 Diagram of succession of colours on rotating analyser. 358 Diagram of intensity of colours in quartz plate. 359 Diagram illustrating production of circular motion by two rectangular vibrations. 360 Vibration phases. Compound. 261 Diagram of spiral curve on cylinder. 262 "Wheatstone’s apparatus for illustrating cir- cular wave-motion. 263 Apparatus for illustrating plane and circular wave-motion. 264 Eight and left-handed quartz crystals. 265 Quartz wedges. Babinet’s compensator. 266 Bands of colour in quartz wedges. 267 Hyperbolte exhibited by quartz plates. 268 Amethyst. Superposed laminte. 269 Phenomena of quartz in convergent light. 270 Airy’s spirals. S71 Funnel’s zhomb. 372 Wheatstone’s apparatus for circular polar- isation. 273 Dislocation of crystal rings by circularly polarised light. 274 Explanation of dislocation of crystal rings. 275 Stauroscope andBrezina plate. 276 Eotation of plane of polarisation. Biot’s apparatus. 277 Soleil’s saccharometer. 278 Soleil’s saccharometer. Section. 279 Wild’s polari-strobometer. 2S0 Hoffmann’s polarimeter. 281 Laurent’s saccharometer. 282 Lanrent’s saccharometer. Section. 2S3 Electromagnetic rotation of plane of polar- isation. Faraday’s experiment. 284 Electromagnetic rotation of plane of polar- isation. Yerdet’s apparatus. 285 Arago’s polarimeter. 286 Haidiuger’s “ brushes.” 287 Polariscope for projection. Eeflecting. 288 Polariscope for projection. Duboscq’s 289 Polarising apparatus with large Nicol prisma for projection with electric light. (Ee 7 „ P. Sleeman). 290 Apparatus for spectra of polarised light. 291 Bands in spectra of polarised light. No. 1. 292 Bands in spectra of polarised light. No. 2. 293 Polariscope with rotating analyser. (Mach). 294 Selenite plate, seen with rotating analyser. 295 Quartz plate, seen with rotating analyser. 296 Spiral spectral bands, seen with rotating analyser. 297 Identity of light and radiant heat. Reflec- tion. 298 Identity of light and radiant heat. Refrac- tion. 299 Identity of light and radiant heat. Double refraction. 800 Identity of light and radiant heat. Polar* isation. THE S0LAK SYSTEM ILLUSTRATED, WITH A GLIMPSE AT THE STELLAR ‘ UNIVERSE 1 Introduction. 3 Relative sizes of the Sun and Planets. 8 Apparent size of the Sun as visible from the Planets. 4 Telescopic View of Solar Diso- 5 Typical Sun Spot. 6 Zones of Sun Spots. 7 Comparative sizes of the principal Planets. 8 Phases of an Inferior Planet. 9 Comparative sizes of Venus and Earth. 10 Telescopic Appearances of Venus. 11 Constant inclination of Earth’s Axis to the Ecliptic. 12 The Seasons. 18 Curvature of the Earth’s Surface. 14 Phil Moon. 16 The Tides. 16 Lunar Eclipses. fi7 Solar Eclipses, 1S30 to i860. $6 Total Solar Eclipse. 19 Views of Solar Prominencies. SO Moon at First Quarter. 21 Moon at Third Quarter. 32 Triesnecker. 23 Ideal Lunar Landscape. 24 Views of Mars. C6 Comparative sizes of Jupiter and Earth. 26 Comparative sizes of Saturn and Earth. 27 Views of Saturn. 28 View oi Saturn. 29 Orbits of the Uranian Satellites. 30 Diagram explaining Discovery of Neptune. 81 A Shooting Star. 32 Meteoric Shower. 33 Ring of Meteoric Bodies round the Sun. 34 Great Comet of 1811. 85 Halley’s Comet. 36 Donati’s Comet. 37 Coggia’s Comet. 38 The Celestial Sphere and Diurnal Motion. 39 The Northern Circumpolar Stars. 40 Ursa Major and Ursa Minor. 41 Part of Constellation “ Gemini,” as seen with the naked eye. 43 Part of Constellation “ Gemini,” as seen with Telescope. 43 The Northern “ Milky Wav.” 44 Herschel’s Theory of the Uai7erso» 46 Multiple System of Stars. 46 Star Clusters. 47 Annular Nebular. 48 Nebula in Canes VenaticL 49 The Great Nebula in Orion. 60 Central part of the Orion Nebula,,