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;