Sirius, a binary star,[ 41];
mass,[ 42]
parallax,[ 42], [416]
spectrum, [133] [373] [383]
former redness, 375 note
radial movement, [386] [387]
Smyth, Admiral, Donati's comet, [324]
Smyth, Piazzi, oxygen spectrum, [215];
lunar radiations, [269]
expedition to Teneriffe, [434]
Solar spectrum, fixed lines in, [133]-135;
maps, [133] [136] [206] [210] [211] [224] [440]
distribution of energy, [222] [223]
[Pg 486] Solar system,
translation through space, [15],[ 39],[ 40], [406]
development, [308] [309] [313]-316 [322]
complexity, [441]
Soret, solar temperature, [218]
South, observations of double stars,[ 45];
12-inch lens, [113]
Rosse reflector, [117]
occultation by Mars, [276]
Spectroscopic binaries, [387]-391
Spectrum analysis, defined, [130];
first experiments, [131] [132]
applied to the sun, [133]-135 [156]
to the stars, [133] [372] [373]
Kirchhoff's theorem, [135]
elementary principles, [139] [140]
effects on science, [141] [142]
radial motion determined by, [201] [386]
investigations of comets by, [342] [343]
of new stars, [393] [399]
of nebulæ, [401]-403