The fate of the average solar star is sketched out by Vogel’s classification, and by any evolutionary hypothesis which we may adopt. In the words of Lowell: “Though we cannot as yet review with the mind’s eye our past, we can, to an extent, foresee our future. We can with scientific confidence look forward to a time when each of the bodies composing our Solar System shall turn an unchanging face in perpetuity to the Sun. Each will then have reached the end of its evolution set in the unchanging stare of death. Then the Sun itself will go out, becoming a cold and lifeless mass; and the Solar System will circle unseen, ghostlike, in space, awaiting only the resurrection of another cosmic catastrophe.” As to what this cosmic catastrophe will be, science gives no definite idea; nor can astronomers say with certainty whether the Universe will come to an end by the extinction of its luminaries, or whether the suns and planets will be brought back to luminosity again; but the human mind shrinks from the idea of a dead Universe. At this point science has said its last word, and must give place to religion. In our day we may repeat with deeper meaning the words of the Scottish astronomer, Thomas Dick: “Here imagination must drop its wing, since it can penetrate no further into the dominions of Him who sits on the Throne of Immensity. Overwhelmed with a view of the magnificence of the Universe, and of the perfections of its Almighty Author, we can only fall prostrate in deep humility and exclaim, ‘Great and marvellous are Thy works, Lord God Almighty.’” INDEX. A Absolute parallax, 158. Adams, J. C., 78, 116, 117, 118, 119, 120, 140. Adams, W., 205. Aerolites, 147, 148, 149. Airy, Sir G. B., 27, 104, 117, 120. Aitken, R. G., 202. Alcyone (η Tauri), 217. Aldebaran (α Tauri), 151, 166, 170, 172. Algol (β Persei), 178, 182, 183, 184, 193, 204. Al-Sufi, 180, 183. Altair (α Aquilæ), 170. Anderson, T. D., 191, 192. Andromeda nebula, 180, 208. Andromedæ (γ), 201. Andromedæ (Nova), 180. Andromedid meteors, 142, 149. Angström, A. J., 50, 51. Antares (α Scorpii), 171. Aquila, 195. Aquilæ (η), 185, 186. Arago, F. J. D., 6, 11, 31, 37, 40, 118, 120, 129. Arcturus (α Bootis), 165, 170. Arequipa Observatory, 75. Argelander, F. W. A., 27, 159, 167, 178, 179, 180, 218. Argo Navis, 221. Argus (η), 187, 188. Armagh Observatory, 206. Asteroids, 19, 62, 97-102. Astronomer-Royal of Scotland, 134, 155, 191; of England, 59, 17; of Ireland, 151, 156. Astronomy of the invisible, 203. Aurigæ (Nova), 191, 192, 195. Auwers, A., 167, 188, 203.