LIST OF PLATES.
| PLATE | ||||
| I. | The Planet Saturn | Frontispiece | ||
| II. | A Typical Sun-spot | To face page | 9 | |
| A. | The Sun | " | " | 44 |
| III. | Spots and Faculæ on the Sun | " | " | 37 |
| IV. | Solar Prominences or Flames | " | " | 57 |
| V. | The Solar Corona | " | " | 62 |
| VI. | Chart of the Moon's Surface | " | " | 81 |
| B. | Portion of the Moon | " | " | 88 |
| VII. | The Lunar Crater Triesnecker | " | " | 93 |
| VIII. | A Normal Lunar Crater | " | " | 97 |
| IX. | The Lunar Crater Plato | " | " | 102 |
| X. | The Lunar Crater Tycho | " | " | 106 |
| XI. | The Planet Jupiter | " | " | 254 |
| XII. | Coggia's Comet | " | " | 340 |
| C. | Comet A., 1892, 1 Swift | " | " | 358 |
| XIII. | Spectra of the Sun and of three Stars | " | " | 47 |
| D. | The Milky Way, near Messier II. | " | " | 462 |
| XIV. | The Great Nebula in Orion | " | " | 466 |
| XV. | The Great Nebula in Andromeda | " | " | 468 |
| E. | Nebulæ in the Pleiades | " | " | 472 |
| F. | ω Centauri | " | " | 474 |
| XVI. | Nebulæ observed with Lord Rosse's Telescope | " | " | 476 |
| XVII. | The Comet of 1882 | " | " | 357 |
| XVIII. | Schiaparelli's Map of Mars | " | " | 221 |