CONTENTS OF VOL. II 



PAGE 



List of Plates ... ... ••• ••• ••• ••• x ^ n 



List of Woodcuts ... ... ... ••• ••• X1V 



List of Genetic Tables ... ... ... •- ••• xvii 



CHAPTER XV. 



THE DURATION OF HUMAN TRIBAL HISTORY. 



Comparison of Ontogenetic and Phylogenetic Periods of Time. — Dura- 

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

 Brevity of the Latter in Comparison with the Immeasurable Long 

 Periods of Tribal History. — Relation of this Rapid Ontogenetic 

 Modification to the Slow Phylogenetic Metamorphosis. — Estimate 

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

 Thickness of Sedimentary Rock-strata, or Neptunian Formations. 

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

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

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

 V. Quaternary, or Anthropolithic Epoch. — The Relative Duration 

 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-Germanic 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- 

 cestral Forms. — Monera originated by Spontaneous Generation. 

 — Necessity of Spontaneous Generation 



