| FIG. | PAGE |
| [1]. | VESUVIUS, AS SEEN FROM THE ISLAND OF NISIDA, INMODERATE ACTIVITY | 2 |
| [2]. | ERUPTION OF VESUVIUS IN 1882 | 4 |
| [3]. | ERUPTION OF VESUVIUS IN 1872 | 6 |
| [4]. | PHOTOGRAPH OF VESUVIUS, 1906. CHIEFLY CLOUDS OFASHES | 8 |
| [5]. | BLOCK LAVA ON MAUNA LOA | 10 |
| [6]. | THE EXCELSIOR GEYSER IN YELLOWSTONE PARK, U. S. A.REMNANT OF THE POWERFUL VOLCANIC ACTIVITY IN THE TERTIARY AGE | 11 |
| [7]. | MATO TEPEE IN WYOMING, U. S. A. TYPICAL VOLCANIC"NECK" | 12 |
| [8]. | CLEFTS FILLED WITH LAVA AND VOLCANIC CONE OF ASHES,TOROWHEAP CAÑON, PLATEAU OF COLORADO | 13 |
| [9]. | THE KILAUEA CRATER ON HAWAII | 15 |
| [10]. | CHIEF EARTHQUAKE CENTRES, ACCORDING TO THE BRITISHASSOCIATION COMMITTEE | 22 |
| [11]. | CLEFTS IN VALENTIA STREET, SAN FRANCISCO, AFTER THEEARTHQUAKE OF 1906 | 25 |
| [12]. | SAND CRATERS AND FISSURES, PRODUCED BY THE CORINTHEARTHQUAKE OF 1861. IN THE WATER, BRANCHES OF FLOODED TREES | 27 |
| [13]. | EARTHQUAKE LINES IN LOWER AUSTRIA | 30 |
| [14]. | LIBERTY BUILDING OF LELAND STANFORD JUNIOR UNIVERSITY,IN CALIFORNIA, AFTER THE EARTHQUAKE OF 1906 | 32 |
| [15]. | EARTHQUAKE LINES IN THE TYRRHENIAN DEPRESSION | 34 |
| [16]. | SEISMOGRAM RECORDED AT SHIDE, ISLE OF WIGHT, ONAUGUST 31, 1898 | 35 |
| [17]. | PHOTOGRAPH OF THE SURFACE OF THE MOON, IN THE VICINITYOF THE CRATER OF COPERNICUS | 62 |
| [18]. | SUN-SPOT GROUP AND GRANULATION OF THE SUN | 74 |
| [19]. | PART OF THE SOLAR SPECTRUM OF JANUARY 3, 1872 | 75 |
| [20]. | METALLIC PROMINENCES IN VORTEX MOTION | 76 |
| [21]. | FOUNTAIN-LIKE METALLIC PROMINENCES | 76 |
| [22]. | QUIET PROMINENCES OF SMOKE-COLUMN TYPE | 77 |
| [23]. | QUIET PROMINENCES, SHAPE OF A TREE | 77 |
| [24]. | DIAGRAM ILLUSTRATING THE DIFFERENCES IN THE SPECTRAOF SUN-SPOTS AND OF THE PHOTOSPHERE | 78 |
| [25]. | SPECTRUM OF A SUN-SPOT, THE CENTRAL BAND BETWEENTHE TWO PORTIONS OF THE PHOTOSPHERE SPECTRUM | 78 |
| [26]. | THE GREAT SUN-SPOT OF OCTOBER 9, 1903 | 79 |
| [27]. | THE GREAT SUN-SPOT OF OCTOBER 9, 1903 | 80 |
| [28]. | THE GREAT SUN-SPOT OF OCTOBER 9, 1903 | 81 |
| [29]. | THE GREAT SUN-SPOT OF OCTOBER 9, 1903 | 82 |
| [30]. | PHOTOGRAPH OF THE SOLAR CORONA OF 1900 | 83 |
| [31]. | PHOTOGRAPH OF THE SOLAR CORONA OF 1870 | 84 |
| [32]. | PHOTOGRAPH OF THE SOLAR CORONA OF 1898 | 85 |
| [33]. | PHOTOGRAPH OF ROERDAM’S COMET (1893 II.), SUGGESTINGSEVERAL STRONG NUCLEI IN THE TAIL | 100 |
| [34]. | PHOTOGRAPH OF SWIFT’S COMET (1892 I.) | 101 |
| [35]. | DONATI’S COMET AT ITS GREATEST BRILLIANCY IN 1858 | 102 |
| [36]. | IMITATION OF COMETS’ TAILS | 104 |
| [37]. | GRANULAR CHONDRUM FROM THE METEORITE OF SEXES.ENLARGEMENT 1 : 70 | 109 |
| [38]. | ARCH-SHAPED AURORÆ BOREALIS, OBSERVED BY NORDENSKIOLDDURING THE WINTERING OF THE VEGA INBERING STRAIT 1879 | 124 |
| [39]. | AURORA BOREALIS, WITH RADIAL STREAMERS | 125 |
| [40]. | AURORA WITH CORONA, OBSERVED BY GYLLENSKIÖLD ONSPITZBERGEN, 1883 | 126 |
| [41]. | POLAR-LIGHT DRAPERIES, OBSERVED IN FINNMARKEN, NORTHERNNORWAY | 127 |
| [42]. | CURVE OF MAGNETIC DECLINATION AT KEW, NEAR LONDON,ON NOVEMBER 15 AND 16, 1905 | 138 |
| [43]. | CURVE OF HORIZONTAL INTENSITY AT KEW ON NOVEMBER15 AND 16, 1905 | 139 |
| [44]. | ZODIACAL LIGHT IN THE TROPICS | 146 |
| [45]. | SPECTRUM OF NOVA AURIGÆ, 1892 | 154 |
| [46]. | DIAGRAM INDICATING THE CONSEQUENCES OF A COLLISIONBETWEEN TWO EXTINCT SUNS | 157 |
| [47]. | SPIRAL NEBULA IN THE CANES VENATICI | 159 |
| [48]. | SPIRAL NEBULA IN THE TRIANGLE | 161 |
| [49]. | THE GREAT NEBULA IN ANDROMEDA | 163 |
| [50]. | RING-SHAPED NEBULA IN LYRA | 164 |
| [51]. | CENTRAL PORTION OF THE GREAT NEBULA IN ORION | 165 |
| [52]. | NEBULAR STRIÆ IN THE STARS OF THE PLEIADES | 167 |
| [53]. | NEBULAR STRIÆ IN THE SWAN | 169 |
| [54]. | NEBULA AND STAR RIFT IN THE SWAN, IN THE MILKY WAY | 171 |
| [55]. | GREAT NEBULA NEAR RHO, IN OPHIUCHUS | 172 |
| [56]. | STAR CLUSTER IN HERCULES | 173 |
| [57]. | STAR CLUSTER IN PEGASUS | 175 |
| [58]. | CONE-SHAPED STAR CLUSTER IN GEMINI | 176 |
| [59]. | COMPARISON OF SPECTRA OF STARS OF CLASSES 2, 3, 4 | 185 |
| [60]. | COMPARISON OF SPECTRA OF STARS OF CLASSES 2, 3, 4 | 186 |