INDEX TO VOL. IV. 



Abdubrahman Sufi, his notice of neb- 

 ulous spots, 15, 44. 

 Absence of solar spots and bad harvests, 



supposed connection of, Sir William 



Herschel on, 68. 

 Acosta, on the black specks of the south- 

 ern hemisphere, 50. 

 Adams and Leverrier, claims of, to the 



discovery of Neptune, 179. 

 Aerolites, of extraterrestrial cosmical 



origin, 199 ; fall of, 219. 

 Alphonsine Tables, their date, 15. 

 Anaxagoras of Clazomene, on meteoric 



stones, 206. 

 Andromeda, nebula in, its discovery, 16 ; 



further researches, 17, 18 ; not noticed 



by Huygens, 38. 

 Anghiera. See Peter Martyr. 

 Annular nebula}, rare, 32. 

 April, falling stars in, 214. 

 Apsides, line of motion of, 123. 

 Arabian notices of the Magellanic Clouds, 



15, 44. 

 Arago, on the physical constitution of the 



Sun, 62. 

 Arago and Plateau, different views of, on 



irradiation, 148. 

 ij Argtis, nebula round, its magnificent 



effulgence, 41. 

 Asterion, spiral nebula in, 42. 

 Asteroids, 57 ; numerical data, 213 ; 01- 



bers'a conjecture as to their origin, 



164; 

 Astraea, discovery of, 100 ; elements, 163. 

 Atmosphere, lunar, disproved, 147. 

 August, falling stars in, 214. 

 Axes of rotation, inclination of, 121. 

 Axial rotation of the planets, periods of, 



120. 



Bessel, on the planet beyond Uranus, 179. 



Biela's Comet, separation of, into two 

 parts, 193 ; elements, 197. 



Black specks in the southern hemisphere, 

 50. 



Bode, on solar spots, 66 ; his law of plan- 

 etary distance, 116. 



Bond, nebulae resolved by, 32, 39. 



Brorsen's Comet, elements, 197. 



Cadamosto seeks for a south polar star, 28. 



Canes Venatici, spiral nebula in Asterion, 

 one of, 4»2; a most remarkable phe- 

 nomenon, 42. 



Canopi, three, of Vespucci, 46. 



Cape Catalogue (or Southern Catalogue) 

 of Sir John Herschel, 26. 



Oape Clouds, or Magellanic Clouds, 43 ; 

 eoutliem cloiflis vaguefy so called, 45, 



Cassini, on nebulae, 19 ; on the Suo'i 

 spots, 65. 



Ceres, discovery of, 100 ; elements, 163. 



Chinese statements as to the obliquity of 

 the ecliptic, 125 ; as to comets, 186 ; aa 

 to falling stars and meteoric stones, 206. 



Classification of nebulae, 19, 32 ; of plan- 

 ets, 101. 



Coal-bags, or coal-sacks, in the southern 

 hemisphere, 50. 



Colored glasses, early use of, by Belgian 

 pilots, 65. 



Comet of Aristotle, 187. 



Comet of Colla and Bremiker, 196. 



Comet, Halley's, 186, 195. 



Comet, Olbers's, 195. 



Comets, orbits of, indicate the limits of 

 the solar system, 57 ; called light- 

 clouds by the Greeks, 181 ; hypothesis 

 of their similarity to asteroids, 182; 

 number discovered annually, 184 ; re- 

 appearance of Halley's Comet, 186; 

 Chinese statements, 186; Comet of Aris- 

 totle, 187; tails of comets, 189, 192; ra- 

 diant heat, 191 ; Lexell's Comet, 191 ; 

 Biela's Comet, 193; numerical data, 

 195; elements of the six interior com 

 ets, 197 ; inclination of the orbits, 198 ; 

 Chaldean opinions on, 200. 



Craters of the Moon, 155. 



Crema, great fall of aerolites at, 220. 



Cusa, Cardinal de, his remarkable viewa 

 of the physical constitution of the Sun, 

 62 ; on the motion of the Earth, 64. 



Cygnus, nebula in, 46. 



D' Arrest's Comet, elements, 197. 



Days and hours, planetary, 94. 



December, falling stars in, 216. 



De Hoces discovers the southern ex- 

 tremity of the new continent, 46. 



Densities of the planets, 119. 



De Vico's Comet, elements, 197. 



Dione, a sateUite of Saturn, 174. 



Distances of the planets from the Sun, 

 107. 



Double nebulae, 32. 



Double stars differ in their natural char- 

 acter from our solar system, 53. 



Dunlop, his observations of nebulae at 

 Paramatta, 22, 26. 



Earth, the, distance, and other numerica. 

 data, 141 ; nutation, 105, 125. 



Earth-light, what, 144 ; known to Leon- 

 ardo da Vinci, 145. 



Egeria, discovery of, 101 ; elements, 163. 



Elliptical nebulae, named the norma] 

 type, 31. 



