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]
Auroræ, 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] [Pg 472]
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]
Bakhuyzen, rotation of Mars, [275]