INDEX. 



217 



93 ; photometric arrangement of the 

 fixed stars, 99 ; on the number of stars 

 actually registered. 106 ; on the cause 

 of the red color of Sirius, 131, 132; on 

 the Milky Way, 145 ; on the sun's place, 

 150; on the determined periods of vari- 

 able stars, 166; number of double stars 

 the elements of whose orbits have been 

 determined, 211. 

 Hieroglyphical signification of a star, ac- 

 cording to Horapollo, 128. 

 Hind's discovery of a new reddish-yellow 

 star of the fifth magnitude, in Ophiu- 

 chus, 1 60 ; has since sunk to the eleventh 

 mHgnitude, 160; calculation of the or- 

 bits of double stars by, 211. 

 Hipparchus. on the number of the Plei- 

 ades, 48 ; his catalogue contains the 

 earliest determination of the classes of 

 magnitude of the stars, 90 ; a fragment 

 of his work preserved to us in Aratus, 

 109. 

 Holtzmann, on the Indian zodiacs, 121. 

 Homer, not an authority on the state of 

 Greek astronomy in his day, 119, 123. 

 Humboldt, Alexander von, works of, 

 quoted in various notes: 

 Ansichten der Natur, 79. 

 Asie Centrale, 111, 112. 

 Essai sur la Geogr. des Plantes, 58. 

 Examen Critique de l'Histoire de la 



Geographic 49, 112, 137. 

 Lettre a M. Schumacher, 93. 

 Recueil d'Observations Astrono- 



miques, 43, 47, 93. 

 Relation Historique du Voyage aux 

 Regions Equinoxiales, 56, 5479, 93. 

 Vue des Cordilleres et Monumens 

 des Peuples Indigenes de l'Amer-" 

 ique, 121, 136. 

 Humboldt, Wilhelm von; quoted, 25. 

 Huygens, Christian, his ambitious but un- 

 satisfactory Cosmotheoros, 20; exam- 

 ined the Milky Way, 144. 

 Huygens, Constantin, his improvements 



in the telescope, 62. 

 Hvergelmir, the caldron-spring of the Ed- 

 da-Songs, 8. 



Indian fiction regarding the stars of the 

 Southern hemisphere, 138. 



/ndian theory of the five elements (Pant- 

 schata), 31. 



Indian zodiacs, their high antiquity doubt- 

 ful, 121. 



Jacob, Capt, on the intensity of light in 

 the Milky Way, 146; calculation of the 

 orbits of double stars, by, 211. 



Joannes Philoponus. on gravitation, 18. 



Jupiter's satellites, estimate of the magni- 

 tudes of, 50; case in which they were 

 visible by the naked eye, 52; occulta- 

 tions of, observed by daylight, 62. 



Kepler, his approach to the mathematical 

 application of the theory of gravitation, 

 18; rejects the idea of solid orbs, 126. 



Lalande, his Catalogue, revised by Baily, 

 115. 



Vol. Ill K 



Lassell's telescope, discoveries made by 

 means of, 65. 



Lepsius, on the Egyptian name (Sothis) 

 of Sirius, 134. 



Leslie's photometer, defects of, 96. 



Libra, the constellation, date of its intro- 

 duction into the Greek sphere, 120. 



Light, always refracted, 44 ; prismatic 

 spectra differ in number of dirk lines 

 according to their source, 44, 45 ; polar- 

 ization of, 45 ; velocity of, 79 ; ratio of 

 solar, lunar, and stellar, 95 ; variation 

 of, in stars of ascertained and unascer- 

 tained periodicity, 168, 177. 



Light of the sun and moon, Eater's and 

 Michelo's estimates of the comparative, 



m 



Limited transparency of the celestial re- 

 gions, 38. 



Macrobius, " Sphaera aplanes" of, 27. 



Madler. on Jupiter's satellites. 52 ; on the 

 determined periods of variable stars, 

 166; on future polarstars, 181 ; on non- 

 luminous stars, 187; on the center of 

 gravity of the solar system, 198. 



Magellanic clouds, known to the Arabs, 91. 



Magnitude of the stars, classes of, 90, 91. 



Malus, his discoveries regarding light, 45. 



' Mappa coelestis" of Schwinck, 140. 



Ma-tuan-lin, a Chinese astronomical rec- 

 ord of, 109. 



Mayer, Christian, the first special observer 

 of the fixed stars, 202. 



Melville Island, temperature of, 36. 



Michell, John, 95 ; applies the calculus of 

 probabilities to small groups of stars, 

 201 ; little reliance to be placed in its 

 individual numerical results, 202 



Michelo's comparative estimate of the 

 light of the sun and moon, 95. 



Milky Way, average number of stars in, 

 and beyond the, according to Strove, 

 139 ; intensity of its light in the vicinity 

 of the Southern Cross, 147 ; its course 

 and direction, 147 ; nost if the new 

 stars have appeared in its neighbor- 

 hood, 162. 



Morin proposes the application of the tel- 

 escope to the discovery of the stars in 

 daylight, 41, 66. 



Motion, proper, of the fixed stars, 182; 

 variability of, 185, 186. 



Multiple stars, 130, 199 ; variable bright- 

 ness of, difference of opinion regarding, 

 210. 



Nebula?, probably closely crowded stellar 

 swarms, 37. 



Neptune, the planet, its orbit used as a 

 measure of distance of 61 Cygni, 204. 



New stars, 151 ; their small number, 151 ; 

 Tycho Brahe's description of one, 152 ; 

 its disappearance, 153 ; speculations as 

 to their origin, 161 : most have appear- 

 ed near the Milky Way, 162. 



Newton, embraces by his theory of gravi- 

 tation tfie whole uranological portion 

 of the Cosmos, 21. 



Non-luminous stars, problematical exist- 

 ence at, 187. 



