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30 ASTRONOMY. 207 203 209 210 . 211 212 213 214 215 310 217 318 219 220 221 222 323 224 225 220 227 228 229 230 231 282 233 234 335 230 237 233 230 Star Clusters. Star Clusters in Hercules. The Northern “ Milky T7ay.* Star Spectroscope (Secchl). 1 Star Spectroscope. (Huggins). Types of Stellar Spectra. (SeccfcO, Spectrum of Sirius. Spectrum of A in a Herculio Spectrum of fi Cygni, Spectrum of T Coronte AorealK- Speetra of a Orionis and Aldebara®. Proper motions of Stars. Chart of all Stars visible to tho naked eye Hersehol’s Theory of the Universe. Comet, as drawn in tho 18th century. Great Coinet of 1811. (Smythl Halloy’s Comet. 3S36. Donati’s Comet. No. 1. Donati’s Comet. No. 2. Coggia's Comet No. 1. Coggia’s Comet No. 2. Winneeke’s Comet Cometary and Carbon Specfe?;, Nebula. (Messier 13). Annular Nebula. Tho Ring Nebula In Lyra. Nebula in Canes Yenatici. No. 1 (Stnvtb and Herschel). Nebula in Canea Ven&ticl. No. 2. 'Rosao) Spiral Nebulae. (Rossc). Nebula in Andromeda. No. 1. (Herschel) NebuLa in Andromeda. No. 2. (Bond). Dumb-bell" Nebula in Yulpecula. No 1 (Bond). '•Dumb-bell" Nebula ia Yulpecula. No S. *Ropse). 240 Trifid Nebula. 241 Nebulae 30 Doradfis, b surrounding a Argfis, 242 The great Nebula in Orion. (Bond). 243 Central part of the Orion Nebula. 244 Spectrum of a Nebula. (Huggins). 24-5 Aurora Borealis. No. 1. 246 Aurora Borealis, No 2. &47 tncient Cosmographies. No. 1. EarttsJj (Aryan) representation of the Earth. 248 Ancient Cosmographies. No. 2. Zodiac oi Denderah. 349 Ancient Cosmographies. Ne. 8. Tho floating Earth. 250 Ancient Cosmographies. Na ^ Earth with roots. 251 Ancient Cosmographies. No. 5. Barth ol Vedio priests. 252 Auciont Cosmographies. No. 6. Hindoo Earth 253 Ancient Cosmographies. No. 7. Earth ol Anaximander. 254 Ancient Cosmographies. No. 8. Plato’s Cubical Earth. 255 Ancient Cosmographies. No. 9. Egyptian Earth. 256 Ancient Cosmographies. No. 16. Homeric System. 257 Ancient Cosmographies. No. H. System of Cosmas. No. 1. S5S Ancient Cosmographios. No. 12. System of Cosmas. No. 2. 259 Ancient Cosmographios. No. 13. Earth as a floating egg. 250 Ancient Cosmographies. No. 14. Esihto century map of world. PART IV.-ASTRONOMIOAl INSTRUMENTS, &C. 261 282 263 264 265 266 267 270 271 272 273 274 275 876 377 278 279 280 «82 Invention of the Telescope. Telescope of 17th century. Lenses in Astronomical Telescopes. Galilean Telescope. (Opera glass). Alt-azimuth Telescope. (Cooke). Equatorial Telescope. Equatorial Telescope at Cambridge, U.aA. Equatorial Telescope at Greenwich Obser- vatory. Tho “ Nowall ” Telescope. Gregorian and Cassegrainian Re Sectors. Newtonian and Herschelian Reflectors. Reflecting Telescopes. (Browning). Lord Lindsay’s Reflector. Herschel’s Great Telescope. The Rosso Telescope. No. 1. The Rosso Telescope. No. fi Foucault’s Telescope. Tho Melbourne Telescope. (Grubfe\ Mural Circle of Tycho Brahe. Transit Instrument. (Cooke). Transit Instrument at Greenwich Ofcec?- vatory. 242 Artificial Horizon. 283 Cross-wires, and Mierometers. 234 Illustration of ubo of a Filar Micrometer. 285 Illustrations of use of Position Micrometer. 286 Tho double-refraction of Iceland Spar. 287 The double-image Micrometer. 288 Foucault’s Siderostat. 289 The Sextant. 290 Lunar Observation with the Sextant 291 Explanation of the Sextant. 292 Tycho Brahe’s Observatory on the Island ol Huen, 1580. 203 Greenwich Observatory. No. 1. 294 Greenwich Observatory. No. 2. 295 Oxford University Observatory. 296 The Melbourne Observatory. 297 Temporary Observatory of Eclipse Expedi- tion, 1860. £98 An Astronomer at work. 299 Portrait of Sir W. Herschel. 800 Portrait of Sir/, F. W. Herscfest For further illustration c t “Spectrum Amalyeib” reference may be madeto tho special . d070l8d ttat Tfa « the °*T of Astronomical Instruments, be , vfll be found to fc> fully exemplified in tfeo series of slides on “Ltusv."