riability, 403, 404;
radial movements, 405;
photographs, 407-409, 425

Nebular hypothesis, Herschel's, 24, 25;
Laplace's, 25, 308, 309, 322;
objections, 313-315

Neison, atmosphere of Venus, 254;
rills on the moon, 263;
_The Moon_, 265

Neptune, discovery, 78-83;
satellite, 83, 305;
density, 84;
comets captured by, 98, 306, 365;
mode of rotation, 305, 313, 315, 322

Newall, F., duplicity of Capella, 389;
stellar radial motions, 430

Newall, R. S., 25-inch refractor, 430

Newcomb, runaway stars, 39;
solar translation, 40;
origin of minor planets, 76;
telescopic powers, 119;
corona of 1878, 176;
of 1869, 183;
distance of the sun, 231-233;
velocity of light, 241;
variation of latitude, 259;
lunar atmosphere, 263;
lunar theory, 272, 273;
disturbance of Neptune's satellite, 305;
formation of planets, 314;
star catalogue, 415;
structure of Milky Way, 423

Newton, H. A., capture of comets by planets, 98;
falls of aerolites, 311;
November meteors, 330, 331;
meteors of 1885, 336, 337;
orbits of aerolites, 340

Newton, Sir Isaac, founder of theoretical astronomy, 1, 141;
comets subject to gravitation, 88;
first speculum, 109;
solar radiations, 216;
law of cooling, 217-219;
telescopes and atmosphere, 434

Niesten, volume of asteroids, 287;
red spot on Jupiter, 293

Nobert, diffraction gratings, 439

Noble, observations of Mercury, 246;
secondary tail of comet, 355

Nolan, origin of the moon, 317;
period of Phobos, 320

Norton, expulsion theory of solar appendages, 193 _note_;
comets' tails, 345, 347

Nova Andromedae, 394, 395

Nova Aurigae, 396-399

Nova Cygni, 393, 394, 398

Nova Persei, 400, 401

Nutation, discovered by Bradley, 3, 15;
a uranographical correction, 31

Nyren, constant of aberration, 241

Observatory, Greenwich, 3, 27, 433;
Cape of Good Hope, 6, 36, 433;
Paramatta, 6, 90;
Harvard College, 7, 85;
Koenigsberg, 30;
Dorpat, 43;
Pulkowa, 44;
Palermo, 72;
Berlin, 90;
Anclam, 149;
Potsdam, 149;
Kew, 153;
Arequipa, 264, 435, 436;
Yerkes, 433;
Lick, 435

Occultations of stars by comets, 95, 105, 106;
by the moon, 263;
by Mars, 276;
of Jupiter by the moon, 264

Olbers, Bessel's first patron, 29, 3