87. OLD DRAWING OF THE CLUSTER IN HERCULES 290

88. OLD DRAWING OF THE ANDROMEDA NEBULA 291

89. THE GREAT NEBULA IN ORION 292

90. PLANETARY ORBITS TO SCALE 297

91. DIAGRAM ILLUSTRATING PARALLAX 307

92. THE KOeNIGSBERG HELIOMETER 312

93. PERTURBATIONS OF URANUS 320

94. URANUS' AND NEPTUNE'S RELATIVE POSITIONS 325

95. METEORITE 333

96. METEOR STREAM CROSSING FIELD OF TELESCOPE 334

97. DIAGRAM OF DIRECTION OF EARTH'S ORBITAL MOTION 335

98. PARABOLIC AND ELLIPTIC ORBITS 340

99. ORBIT OF HALLEY'S COMET 341

100. VARIOUS APPEARANCES OF HALLEY'S COMET WHEN LAST SEEN 342

101. HEAD OF DONATI'S COMET OF 1858 343

102. COMET 344

103. ENCKE'S COMET 345

104. BIELA'S COMET AS LAST SEEN IN TWO PORTIONS 346

105. RADIANT POINT PERSPECTIVE 348

106. PRESENT ORBIT OF NOVEMBER METEORS 349

107. ORBIT OF NOVEMBER METEORS BEFORE AND AFTER ENCOUNTER
WITH URANUS 351

108. THE MERSEY 355

109. CO-TIDAL LINES, SHOWING THE WAY THE TIDAL WAVE
REACHES THE BRITISH ISLES FROM THE ATLANTIC 359

110. WHIRLING EARTH MODEL 364

111. EARTH AND MOON MODEL 365

112. EARTH AND MOON (EARTH'S ROTATION NEGLECTED) 366

113. MAPS SHOWING HOW COMPARATIVELY FREE FROM LAND OBSTRUCTION
THE OCEAN IN THE SOUTHERN HEMISPHERE IS 369

114. SPRING AND NEAP TIDES 370

115. TIDAL CLOCK 371

116. SIR WILLIAM THOMSON (LORD KELVIN)