0;
discoveries of minor planets, 74, 75;
origin by explosion, 75, 76;
career, 89, 90;
Biela's comet, 95;
comet of 1811, 99;
electrical theory of comets, 100, 104, 324, 347;
multiple tails, 100;
comet of 1819, 101;
cometary coruscations, 105;
November meteors, 329

Olmsted, radiant of Leonids, 328;
orbit, 329

Oppenheim, calculation of Schmidt's comet, 363

Oppolzer, E. von, theory of sun-spots, 159;
variability of Eros, 285

Oppolzer, Th. von, Winnecke's comet, 94;
comet of 1843, 350

Oxygen in sun, 213-215;
telluric absorption, 214;
in stars, 384

Packer, variable stars in cluster, 436

Palisa, search for Vulcan, 181, 250;
discoveries of minor planets, 283

Pallas, discovery, 74;
inclination of orbit, 75, 286;
diameter, 75, 287, 288

Pape, Donati's comet, 345

Parallax, annual, of stars, 10, 16, 33, 36, 416-418;
horizontal, of sun, 227;
Encke's result, 230, 232;
improved values from oppositions of Mars, 231, 237;
from light velocity, 231, 232, 241;
from recent transits, 236, 240;
from observations of minor planets, 238, 239;
general result, 242

Paris Catalogue of Stars, 415

Paschen, oxygen in sun, 215;
solar temperature, 220

Pastorff, drawings of the sun, 101

Peirce, structure of Saturn's rings, 298

Perrine, eclipse photographs, 190;
nature of corona, 191;
observation
of Holmes's comet, 369;
nebula round Nova Persei, 401

Perrotin, rotation of Venus, 252;
markings on, 255;
canals of Mars, 279;
clouds on Mars, 281;
striation of Saturn's rings, 299;
rotation and compression of Uranus, 303, 304;
changes of Pons's comet, 366;
Maia nebula, 410;
measures of double stars, 419

Perry, eclipse of December, 1889, 187

Personal equation, 123, 235

Peter, star-parallaxes, 417

Peters, C. A. F.,
parallax of 61 Cygni, 36;
disturbed motion of Sirius, 42

Peters, C. F. W., orbit of Leonid meteors and comet, 332

Peters, C. H. F., sun-spot observations, 147, 148;
discoveries of minor planets, 283;
star maps, 284, 415

Peytal, description of chromosphere, 69

Phobos, rapid revolution, 282, 283, 314;
tidal relations, 320, 321

Photography, solar, 145, 153, 154, 165;
of corona, 166, 173, 175, 178, 181, 185-190;
without an eclipse, 178-180;
of p