Secchi, chromosphere,[ 70];
Biela's comet,[ 97]
cyclonic movements in sun-spots, [144]
distribution, [148]
profundity, [154]
nature, [156] [158]
constitution of photosphere, [151]
eclipse observations, [166] [167]
reversing layer, [171]
observations of prominences, [194] [196] [199]
absence of helium absorption, [213]
temperature of the sun, [218]
solar atmospheric absorption, [221]
Martian canals, [279]
spectrum of Uranus, [304]
of Coggia's comet, [343]
stellar spectral researches, [372] [373]
carbon stars, [372] [381]
gaseous stars, [377]
See, stellar orbits,[ 42],[ 46];
measures of Neptune,[ 84]
measures of Uranus, [304]
belts of Neptune, [306]
colour of Sirius, 375 note
southern double stars, [419]
evolution of stellar systems, [420]
Seeliger, photometry of Saturn's rings, [299];
rationale of new stars, [396]
Seidel, stellar photometry, [420]
Sherman, spectrum of Nova Andromedæ, [395]
Short, reflectors, [4],[109] [115] [121];
chromosphere,[ 68]
satellite of Venus, [256]
striation of Saturn's rings, [299]
Sidereal science, foundation, [9],[442];
condition in 1785 [ 10]
progress,[ 50]
Sidgreaves, spots and faculæ, [159]
Siemens, regenerative theory of the sun, [312]
Simony, photographs of ultra-violet spectrum, [215]