HENRY FROWDE HODDER & STOUGHTON
OXFORD UNIVERSITY PRESS WARWICK SQUARE, E.C.
1920




_First Edition_ 1919
_Second Impression_ 1930




PRINTED IN GREAT BRITAIN
BY MORRISON & GIBB LTD., EDINBURGH




PREFACE


To-day on all sides we hear of the extreme importance of Preventive
Medicine and the great future which lies before us in this aspect of
our work. If so, it follows that the study of infancy and childhood
must rise into corresponding prominence. More and more a considerable
part of the Profession must busy itself in nurseries and in schools,
seeking to apply there the teachings of Psychology, Physiology,
Heredity, and Hygiene. To work of this kind, in some of its aspects,
this book may serve as an introduction. It deals with the influences