s comet, 94
Asteroids, so designated by Herschel, 75
Astronomical circles, 121, 122
Astronomical physics, 7, 141, 142
Astronomical Society founded, 6;
Herschel its first President, 14
Astronomy, classification, 1;
popularity and progress, 5;
in United States, 6;
in Germany, 28;
practical reform, 32;
of the invisible, 42;
physical, 141
Atmosphere, solar, 94, 182, 192, 221, 225;
of Venus, 236, 239, 253, 254;
of Mercury, 246-248;
of the moon, 263, 264;
of Mars, 276;
of minor planets, 288
Aurorae, periodicity, 129, 162;
excited by meteors, 335
Auwers, reduction of Bradley's observations, 39;
system of Procyon, 42;
opposition of Victoria, 238;
solar parallax, 240;
new star in Scorpio, 395
Babinet, nebular hypothesis, 314
Backlund, movements of Encke's comet, 94, 360
Baden-Powell, Sir George, eclipse expedition, 188
Bailey, nebulosity round Pleiades, 411;
stellar photometric observations, 421;
discovery of variable clusters, 436
Baily, early life and career, 59-61;
observations of eclipses, 61-64;
density of the earth, 60, 261
Baily's Beads, 61, 62
Bakhuyzen, rotation of Mars, 275
Ball, Sir Robert, parallaxes of stars, 36 _note_, 416;
contacts in transits, 239
Balmer's Law, 198, 383
Barnard, micrometrical measures of Neptune, 84;
of minor planets, 288;
of Saturn's rings, 301;
photographs of solar corona, 186, 190;
transit of Mercury, 245;
halo round Venus, 254;
surface of Mars, 280;
ellipticity of Jupiter's first satellite, 292;
of Uranus, 304;
discovery of inner Jovian satellite, 293, 434;
red spot on Jupiter, 296;
eclipse of Japetus, 300;
attendants on comet of 1882, 363;
on Brooks's comet, 366, 367;
Swift's comet, 368;
photographic discovery of a comet, 369;
observations of Nova Aurigae, 398, 399;
Hind's variable nebula, 403;
exterior Pleiades nebulosities, 411;
galactic stars, 423;
photographs of Milky Way, 424, 425;
cluster variables, 433;
horizontal telescope, 438
Bartlett, photograph of a partial eclipse, 166
Basic lines, 206, 207
Baxendell, meteors of 1866, 331
Becker, drawings of solar spectrum, 211
Beckett, Sir E. (Lord Grimthorpe), value of solar parallax, 232
Beer and Maedler, surveys of lunar surface, 265, 267;
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