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

ART. 1. _Gravitation._--In the realm of Science, there exists a Force or
Law that pervades and influences all Nature, and from the power of
which, nothing, not even an atom, is free.

It holds together the component parts of each and every individual
world, and in the world's revolving prevents both its inhabitants and
its vegetation from being whirled off its surface into space. It exists
in each and every central sun, and circles round each sun its associated
system of planets. It rolls each satellite around its primary planet,
and regulates the comet's mysterious flight into the depths of space,
while the pendulation of even the remotest sta