CONTENTS. 



CHAPTER I. THE GENESIS OP THE EARTH. 



MM 



Uniformity and Progress. Internal Heat. Nebular 

 Theory. Probable Condition of the Primitive World 1 



CHAPTER II. THE Eozoic AGES. 



The Laurentian Eocks. Their Character and Distribution. 

 The Conditions of their Deposition. Their Meta- 

 morphism. Eozoon Cauadense. Laurentian Vegeta- 

 tion . . . .17 



CHAPTER III. THE PRIMORDIAL ou CAMBRIAN AGE. 



Connection of the Laurentian and Primordial. Animals 

 of the Primordial Seas. Lingula, Trilobites, Old- 

 hivmia, 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 . . i ' . OC 



CHAPTER V. THE DEVONIAN OR BRIAN AGE. 

 Physical Character of the Age. Difference of Deposits in 

 Marginal and Continental Areas. Specialisation of 

 Physical Geography. Corals, Crustaceans, Fishes, 

 Insects, Plants . g 



