292 



Index 



"Giant" stars, 13, 201, 202, 250 

 Globular star-clusters, 8, 9, 220, 221, 243 



Halm, 239 



Hertzsprung, 3, 9 



Hinks. 9 



Homologous contraction, 194, 242 



Irregular Nebulae, 5, 6, 7, 204 



Island universe hypothesis, 5, 203, 218, 220 



Jacobian ellipsoids, 35, 39 ff., 48, 84, 92, 105, 



132, 143, 153 

 Jeffreys (H.), 274, 281 

 Jonckheere, 3, 265 

 Jupiter, 280, 282, 283, 284 



satellites of, 2, 3, 136, 138, 281, 284 



Kant, 10, 11 



Kapteyn, 239 



Keeler, 4, 6 



Kelvin (Lord), 13, 15, 285 (see also Thomson 



and Tait) 

 Kinetic Theory of Gases, analogies with, 224, 



229, 230, 232, 241, 261 

 Kostinsky, 6, 223 



Lane's Law, 192 



Laplace, 10, 11, 210, 213, 215, 272 ff., 289 



's law of density, 165 

 Liapounoff, 33, 87, 88 

 Ligondes, 18 

 Lindemann, 286 

 Linear series of equilibrium configurations, 20, 



35 ff., 142, 148 

 Lockyer (Sir J. Norman), 13 

 Ludendorff, 9 

 Luminosities of stars, 201, 287 



M-type stars, 13, 14, 202, 239, 241, 288 

 Maclaurin's spheroids, 35, 38 ff ., 48, 104, 143, 



153 

 Mars, 281, 282 



,, satellites of, 136, 281, 282, 285 

 Masses of nebulae, 217 



,, stars, 222 



Mass-ratio of binary stars, 3, 134 

 Maxwell, 12 

 Melotte, 8, 9 

 Mercury, 2, 284 

 Meyer (C. 0.), 39 

 Moulton (F. B.), 15, 16, 267, 272 



Nebula in Andromeda (M. 31), 5, 217, 223 

 Canes Venatici (M. 51), 6, 215 

 ,, Orion, 5, 6, 13, 204 

 Ursa Major (M. 101), 6, 215, 216, 217 



Nebulae, irregular, 5, 6, 7 



planetary, 5, 6, 7, 8, 204, 248 

 ring, 5, 248 

 ,, spindle-shaped, 5, 248 



spiral, 4, 5, 6, 7, 215, 216 ff., 247, 289 

 Nebular hypothesis, 10, 210, 213, 288 

 Neptune, 2, 275 



,, satellites of, 2, 282, 284 



0-type stars, 13, 255 

 Orion nebula, 5, 6, 13, 204 



Pahlen, v. d., 4 



Partial stability, 62 



Pear-shaped figures of equilibrium, 78 ff., 107, 



126 

 Pease, 5, 6, 208, 214, 217 



and Shapley, 8, 221 

 Periods of binary systems, 253, 255, 256, 258, 



260, 263, 264 

 Perrine, 4, 6 



Planetary nebulae, see Nebulae 

 Planetesimal Theory, 16, 131 

 Planets, origin of, 11, 17, 248, 275, 280 ff., 289 

 Pleiades Cluster, 9, 13, 267 

 Plummer (H. C.), 8, 245 

 Poincare', 18, 20, 21, 24, 33, 65, 79, 80, 87, 92, 



117, 144, 188, 191, 209, 211, 272 

 Points of Bifurcation, general theory, 21, 92, 



143 



special cases of, 39, 78, 



87,105,107,132,143, 

 176 



dynamical, 125, 157 



Polaris, 265 

 Potential of ellipsoid, 36 



,, distorted ellipsoid, 66, 87, 166 

 Pseudo-ellipsoids, 143 

 Pseudo-spheroids, 143 

 Pulsations in cosmogony, 17, 209 



BR Centauri, 253 



Radiation from a mass of gas, 191, 198 

 ,, pressure of, 251 

 solar, 285, 286 

 stellar, 198, 200 



Radiative transfer of energy, 197 

 Radioactive energy, 285, 286 

 Relaxation, time of, 229 

 Resisting medium, effect of a, 284 

 Ring nebulae, 5, 248 

 Roche, 12, 46, 47, 48, 49, 54, 55, 136, 147, 209, 



210 

 Roche's model, 12, 147, 184, 185, 208, 258, 270, 



276 



Rotation of gaseous masses, 203, 208, 215 

 ,, ,, planetary nebulae, 7, 248 



