Griffiths, Mr., and Jupiter, 252

Grimaldi, 90

Grubb, Sir Howard, 14

"Guards," the, 412

_Gulliver's Travels_ and the satellites of Mars, 228

H

Hadley's observations of Saturn, 282

Hall, Professor Asaph, and the satellites of Mars, 225

Halley, and the periodicity of comets, 341-343;
and the transit of Venus, 180

Heat, bearings on astronomy, 513;
in the interior of the Earth, 197-199, 514;
of the Sun, 515-526

Heliometer, the, 243

Helium, 55

Henderson, and the distance of a Centauri, 442, 451

Hercules, star cluster in, 269, 462

Herodotus (lunar crater), 90

Herschel, Caroline, 299, 465

Herschel, Sir John, address to British Association, 328;
address on the presentation of gold medal to Bessel, 443;
and Biela's comet, 357;
and nebulae, 464;
letter to _Athenoeum_ on Adams's share in the discovery of
Neptune, 330

Herschel, Sir W., and double stars, 435, 436;
and Saturn, 279;
and Saturn's satellites, 295;
and the Empress Catherine, 301;
and the movement of solar system towards Lyra, 457;
discovery of satellite of Uranus by, 308, 309;
discovery of Uranus by, 305, 308;
early life of, 299;
friendship with Sir W. Watson of 302;
he makes his own telescopes, 301;
"King's Astronomer," 307;
method of making his telescopes, 302;
musical talent of, 299;
organist of Octagon Chapel, Bath, 300;
pardon for desertion from George III., 299;
passion for astronomy of, 300, 301;
relinquishes musical profession, 307;
sidereal aggregation theory of, 529;
study of the nebulae by, 464-465, 529

Herschelian telescope, 19

_Historia Coelestis_, 311

Hoedi, the, 414

Holmes's, Mr., comet (1892), 355

Horrocks, and the transit of Venus, 179

Howard, Mr., and the Benares meteorite, 392

Huggins, Sir W., 479, 483;
and nebulae, 472

Huyghens, and Saturn's rings, 275-278;
discovers first satellite of Saturn, 293

Hyades, the, 419

Hydrogen in Sirius and Vega, 479;
in the Sun, 50

Hyginus, 93

Hyperion, 559

I

Iapetus, 559

Iberians, the, 3

Inquisition, the, and Galileo, 10

Iris, 242

Iron, dust in the Arctic regions, 408;
in the Sun, 50;
of meteorites, the, 396;
spectrum of, 50

J

Janssen, M., 34, 53;
and the transit of Venus, 177

Juno, 233, 238

Jupiter, ancient study of, 6;
and the Leonids, 386;
attraction of, 248;
axial rotation of, 558;
belts of, 252;
brilliancy of, 257;