"In a ... synthesis of much hitherto-scattered data, the authors give new meaning to the continuing debate over the relative importance of heredity and environm

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "pub

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant mark