INTRODUCTION 



herself, in at least some measure, of the nature and bearings 

 of the great fact of evolution. Its principle is a part of 

 established knowledge, acquaintance with which, by reason 

 of the enlightment it sheds on life, each one of us, for our 

 own sake and for the sake of others, should possess. To 

 render help to those who seek such knowledge constitutes 

 both the hope and the purpose of this book. 



t xlli ] 



