This page has been validated.
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.
[ xiii ]
