ART. 96. AETHER AND CENTRIFUGAL FORCE 232 " 97. AETHER AND CENTRIPETAL FORCE 236 " 98. AETHER AND NEWTON'S FIRST LAW OF MOTION 239 " 99. AETHER AND NEWTON'S SECOND LAW OF MOTION 244 " 100. AETHER AND NEWTON'S THIRD LAW OF MOTION 251 " 101. WHY PLANETS REVOLVE FROM WEST TO EAST 253 CHAPTER XI AETHER AND KEPLER'S LAWS ART. 102. AETHER AND KEPLER'S FIRST LAW 256 " 103. AETHER AND KEPLER'S SECOND LAW 260 " 104. AETHER AND KEPLER'S THIRD LAW 263 " 105. ORBITAL MOTION OF PLANETS 266 " 106. ECCENTRICITY OF THE MOON'S ORBIT 268 " 107. THE SUN AND KEPLER'S FIRST LAW 270 " 108. THE SUN AND KEPLER'S SECOND LAW 274 " 109. AETHER AND THE PLANE OF THE ECLIPTIC 277 " 110. AETHER AND THE CENTRIPETAL FORCE 282 CHAPTER XII AETHER AND COMETS ART. 111. WHAT IS A COMET? 291 " 112. ORBITS OF COMETS 293 " 113. KINDS OF COMETS 296 " 114. PARTS OF A COMET 298 " 115. CENTRIFUGAL FORCE AND COMETS 300 " 116. FORMATION OF TAILS 303 CHAPTER XIII AETHER AND STARRY WORLD ART. 117. STARRY WORLD 306 " 118. STARS AND KEPLER'S LAWS 309 " 119. AETHER AND NEBULAE 313 " 120. WHAT IS A NEBULA? 314 " 121. AETHER AND NEBULAR HYPOTHESIS 317 " 122. KINDS OF NEBULAE 319 CHAPTER XIV AETHER AND THE UNIVERSE ART. 123. THE UNIVERSE 323 " 124. UNITY OF THE UNIVERSE 326 " 125. CONSTITUTION OF MATTER 334 " 126. QUOD ERAT FACIENDUM 337 " 127. GOD AND THE UNIVERS 342 APPENDIX 349 INDEX 351 AETHER AND GRAVITATION CHAPTER I PHILOSOPHY OF GRAVITATION