CONTENTS. 



Chapter I. — Tub Genesis op the Earth. 



Uniformity and Progress. — Internal Heat. — Nebular 

 Theory. — Probable Condition of the Primitive World 1 



Chapter II.— The Eozoic Ages. 



The Laurentian Rocks. — Their Character and Distribution. 

 — The Conditions of their Deposition.— Their Meta- 

 raorphism. — Eozoon Canadense.— Laurentian Vegeta- 

 tion 17 



Chapter III.— The Primordial or Cambrian Age. 



Connection of the Laurentian and Primordial. — Animals 

 of the Primordial Seas. — Lingula, Trilobites, Old- 

 hamia, etc. — The terms Cambrian and Silurian. — 

 Statistics of Primordial Life .... 36 



Chapter IV. — The Silurian Ages. 



Geography of the Continental Plateaus. — Life of the 

 Silurian. — Reign of Invertebrates. — Corals, Crinoids, 

 Mollusks, Crustaceans. — The First Vertebrates. — 

 Silurian Fishes.— Land Plants 56 



Chapter V.— The Devonian or Erian Age. 



Physical Character of the Age. — Difference of Deposits in 

 Marginal and Continental Areas. — Specialisation of 

 Physical Geography.— Corals, Crustaceans, Fishes, 

 Insects, Plants 81 



