286, 287;
collective volume, 287;
atmospheres, 288
Plantade, halo round Mercury, 244
Pleiades, community of movement near, 41;
photographed spectra, 385;
measurements, 410;
photographs, 410, 411;
nebulae, 410, 411
Pluecker, hydrogen in sun, 212
Plummer, solar translation, 39;
Encke's comet, 99
Plutarch, solar corona, 65
Pogson, prominence spectrum, 168;
reversing layer, 172;
discovery of a comet, 335, 339;
new star in cluster, 395
Pond, errors of Greenwich quadrant, 28;
controversy with Brinkley, 33
Pons, discoveries of comets, 90, 94, 365
Pontecoulant, return of Halley's comet, 101
Poor, C. Lane, calculation of Lexell's comet, 367
Porter, solar translation, 40
Pouillet, solar constant, 216, 225;
temperature of the sun, 217;
of space, 270
Poynting, mean density of the earth, 261
Prince, glow round Venus, 253
Pritchard, parallax of Beta Aurigae, 388;
photographic determinations of stellar parallax, 417;
photometric catalogue, 420
Pritchett, corona of January, 1889, 186;
red spot on Jupiter, 294
Proctor, glare theory of corona, 182;
speed of ejections from sun, 205;
transit of Venus, 233;
distance of sun, 236;
atmosphere of Venus, 254;
rotation of Mars, 275;
map and canals of Mars, 278, 279;
condition of great planets, 289;
Nova Andromedae, 403;
status of nebulae, 422, 423;
structure of Milky Way, 424;
star drift, 426
Procyon, satellite, 42; parallax, 417
Prominences, observed in 1842, 63, 64, 68;
described by Vassenius, 68;
observed in 1851, 70;
photographed during eclipse, 167, 188, 190;
without eclipse, 197, 198;
spectrum, 168, 178, 194, 195, 198, 199;
spectroscopic method of observing, 168-170, 194-196;
white, 183, 184;
chemistry, 195, 199;
classification, 196;
distribution, 199;
movements in, 204-206;
heat of development, 220
Quetelet, periodicity of August meteors, 329
Ranyard, drawing of sun-spot, 101;
coronal types, 175, 185;
lunar atmosphere, 265;
Jupiter's markings, 297;
meteors from fixed radiants, 341;
cometary trains, 348;
tenuity of nebulae, 409
Rayet, spectrum of prominences, 168, 170
Red spot on Jupiter, 293, 296
Reduction of observations, 31;
Bessel's improvements, 32, 122;
Baily's, 60
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