CONTENTS OF VOL. II. 



List of Platei ••• ••• •^ — ••• •*• ^^ 



List of Woodcuts ... ••• ••• ••• ••• ^^^ 



List of Genetic Tables ... .m ^m m* ••• xvii 



CHAPTER X\. 



THE DURATION OF HUMAN TRIBAL HISTORY. 



C!omparison of Ontogenetic and Phylogenetio Perrodg of Time. — Dora- 

 tion of Germ -history in Man and in Different Animals. — Extreme 

 Brevity of the Latter in Comparison with the Immeasorable Long 

 Periods of Tribal History. — Relation of this Rapid Ontogenetic 

 Modification to the Slow Phylogenetio Metamorphosis. — Estimate 

 of the Past Duration of the Organic World, founded on the Belatire 

 Thickness of Sedimentary Rock-strata, or Neptanian Formationi. 

 — The Five Main Divisions in the Latter : I. Primordial, or 

 Archilithic Epoch. 11. Primary, or Palaeolithic Epoch. III. Second- 

 ary, or Mesolithic Epoch. IV. Tertiary, or Cssnolithio Epoch. 

 V. Qaatemary, or Anthropolithic Epoch. — The Relative Dnration 

 of the Five Epochs.— The Results of Comparative Philology as 

 Explaining the Phylogeny of Species. — The Inter-relations of the 

 Main Stems and Branches of the Indo-Germanio Languages are 

 Analogous to the Inter-relations of the Main Stems and Branches 

 of the Vertebrate Tribe. — The Parent Forms in both Cases are 

 Extinct. — The Most Important Stages among the Human An- 

 eestral Forms. — Monera originated by Spontaneous Generation. 

 — Neeesniy of Bpontaneovs Qeneration 



