CONTENTS. 



CHAPTER I. 



PAGE 



LIMINARY IDEAS OF GEOLOGICAL CHRONOLOGY AND OF THE CLASSI- 

 FICATION OF PLANTS 1 



CHAPTER II. 



VEGETATION OF THE LAURENTIAN AND EARLY PALAEOZOIC QUESTIONS 

 AS TO ALG.E 8 



CHAPTER III. 



BRIAN OR DEVONIAN FORESTS ORIGIN OF PETROLEUM THE 

 AGE OF ACROGENS AND GYMNOSPERMS 45 



CHAPTER IV. 



CARBONIFEROUS FLORA CULMINATION OF THE ACROGENS FOR- 

 MATION OF COAL . . . . . . . . .110 



CHAPTER Y. 



! FLORA OF THE EARLY MESOZOIC REIGN OF PINES AND CYCADS . 175 



CHAPTER VI. 



REIGN OF ANGIOSPERMS IN THE LATER CRETACEOUS AND EARLY 

 TERTIARY OR KAINOZOIC 191 



