ional moment of momentum, 553

Rowland, Professor, and spectral lines, 491

Rowton Siderite, 395

Royal Astronomical Society and Bessel, 442

S

Sappho, 242

Satellites of Jupiter, 249, 250, 257-261, 266, 559;
confirmation of the Copernican theory, 267

Satellites of Mars, 209, 225-228, 551, 558

Satellites of Neptune, 334, 559

Satellites of Saturn, 559;
Bond's discoveries, 296;
Cassini's discoveries, 294;
distances, 559;
Herschel's discoveries, 295;
Huyghens' discovery, 293;
Kirkwood's deduction, 296;
Lassell's deduction, 296;
movements, 296;
origin as suggested by the nebular theory, 526

Satellites of Uranus, 308, 309, 310, 559

Saturn, ancient study of, 6;
attraction on Uranus, 322;
axial rotation of, 558;
beauty of, 209;
comparative proximity to the Earth of, 110;
density of, 558;
diameter of, 271, 558;
distance of, from the Sun, 268, 271, 558;
elliptic path of, 271;
gravitation paramount, 283;
internal heat of, 272, 515;
Leonids and, 386;
low density of, 272;
moment of momentum of, 554;
motion of, 271;
orbit of, 117, 118;
path of, perturbed by the attraction of Jupiter, 316;
periodic time of, 558;
period of revolution of, 269;
picturesqueness of, 291;
position of, in the solar system, 269;
rings of, 269;
rings, Bonds discovery, 280;
rings, Cassini's discovery, 278;
rings, consistency, 286;
rings, Dawes's discovery, 281;
rings, Galileo's discovery, 273, 274;
rings, Hadley's observations, 282;
rings, Herschel's researches, 279;
rings, Huyghens' discovery, 275-278;
rings, Keeler's measurement of the rotation, 288;
rings, Maraldi's researches, 279;
rings, rotation of, 285, 288;
rings, spectrum of, 291;
rings, Trouvelot's drawing, 278;
satellites of, 293, 294, 295, 296, 559;
size of, compared with other planets, 119, 269, 272;
spectrum of, 291;
unequal in appearance to Mars and Venus, 269;
velocity of, 271;
weight of, compared with the Earth, 272

Savary and binary stars, 436

Schaeberle, Mr., and Mars, 224

Scheiner, and the values of velocity of stars, 483;
observations on Sun-spots, 36

Schiaparelli, Professor, and Mars, 220;
and the connection between shooting-star showers and comets, 388;
and the rotation of Mercury, 165

Schickard, 90

Schmidt, and Nova Cygni, 454, 489;
and the crater Linne, 87;
and the Leibnitz Mountains, 93

Schroeter, and the cra