8 PREFACE 



who live under a highly energizing climate and are also under a 

 single government. 



Some readers may feel that the importance of environment is 

 exaggerated in this book. That will be largely because they do 

 not attach as much weight as does the author to the qualifying 

 phrases which he has used. A few generations ago the emphasis 

 was all upon the various agencies which combine to furnish train- 

 ing. In a broad sense these include the Church, the Home, the 

 School, the State, and other institutions. Recently tremendous 

 emphasis has justly been given to another factor, namely, 

 heredity. We are told that heredity plays nine parts and training 

 one in determining what a man's character shall be. According 

 to such an extreme view 'physical environment is scarcely worthy 

 of mention. Yet training, heredity, and physical environment are 

 like food, drink, and air. One or another of these may be placed 

 frst according to the individual preferences, and one or another 

 may demand more attention according to circumstances. It is 

 idle, however, to say that one is any more important than the 

 others. All are essential. Until the world learns this vital 

 lesson, it will be necessary that some students should lay special 

 stress upon heredity because its. importance is not as yet so fully 

 recognized as is that of training. Other students must lay still 

 greater stress upon physical environment because its importance 

 is still less appreciated. When the world realizes that the h«man 

 race must be bred as carefully as race horses, and that even when 

 people inherit perfect constitutions their health must receive as 

 much care as does that of consumptives, it will be time for a 

 book in which training, heredity, and environment receive exactly 

 equal emphasis . 



Part of the material here used has already been published in 

 the Journal of Race Development and in the Qzmrterly Journal 

 of Economics, but most is new. In writing this book, many sources 

 have been drawn upon, some of which are acknowledged in the 

 list of references in the Appendix. The author has also drawn 



