chemical composition, 135, 211-213;
mode of rotation, 146, 147;
Kirchhoff's theory, 149;
Faye's, 150-152;
convection currents in, 150, 152, 165;
dissociation, 152, 206-210;
luminous outbursts, 159-161;
explosions, 205;
heat emission, 216, 217, 221, 222, 225, 226;
temperature, 217-220, 226;
problem of distance, 227;
results from transits, 230, 232, 236, 240;
from oppositions of Mars, 231, 237;
from light-velocity, 232, 241;
from measurements of minor planets, 238;
concluded value, 242;
maintenance of heat supply, 310-313;
past and future duration, 312

Sun-spots, speculations regarding, 52, 53;
Wilson's demonstration, 53, 154;
distribution, 53, 58, 148;
cyclonic aspect, 58, 144, 157, 158;
periodicity, 126, 128, 162, 163;
magnetic relations, 127, 160, 161;
meteorological, 129, 164;
auroral, 129, 130, 160, 162;
photographs, 145, 154;
level, 155;
spectra, 156, 207, 208;
volcanic hypothesis, 158;
Lockyer's rationale, 159;
planetary influence, 163;
relation to Jovian markings, 297

Swan, chromosphere, 70;
sodium line, 132

Swift, E., discovery of a comet, 368

Swift, L., fallacious glimpse of Vulcan, 181, 250;
discovery of a comet, 368

Tacchini, eclipse of 1883, 181;
white prominences, 184;
prominences and chromosphere, 199, 200;
spectrum of Venus, 254

Talbot, Fox, spectrum analysis, 131;
spectroscopic method of determining stellar orbits, 387

Tarde, nature of sun-spots, 52

Taylor, eclipse expedition, 187;
spectrum of Uranus, 305;
achromatic lenses, 431

Tebbutt, comets discovered by, 326, 352;
comet of 1882, 359

Telescopes, achromatic, 112, 431, 432

Telescopes, equatoreal, 84, 120, 121

Telescopes, reflecting, Short's, 4, 109, 115, 121;
Herschel's, 12, 109-111;
Lassell's, 83, 114, 121;
varieties of construction, 109, 110;
Rosse's, 115-119, 434;
Common's, 407, 412, 429

Telescopes, refracting, Fraunhofer's, 34, 35, 121;
Clark's, 114, 429, 430, 433, 436;
Grubb's, 430, 433;
with bent and horizontal mountings, 436-438

Tempel, red spot on Jupiter, 294;
comet discoveries, 327;
cometary observations, 352, 362;
Andromeda nebula, 394;
discovery of Merope nebula, 410

Temperature, of the sun, 217-220, 226;
of the moon, 269, 270;
of spac