x CONTENTS. 



CHAPTER PAGE 



XXX. Anticipations of Man in Nature 331 



XXXI. The Tooth of Time 338 



XXXII. Primeval Man 350 



XXXIII. Will there be an Animal superior to Man? 373 



XXXIV. Popular Beliefs in Periodical Catastrophes to 



the Universe 380 



XXXV. Some Thoughts on Perpetual Motion 390 



XXXVI. Will the Mountains be Leveled? 397 



XXXVII. The Reign of Universal Winter 402 



XXXVIII. The Sun cooling off 408 



XXXIX. The Machinery of the Heavens running down... 417 

 XL. The Cycles of Matter 428 



Appendix 433 



