CONTENTS. 



CHAPTER I. THE GENESIS OF 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- 

 morphism. 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 



