Human nature and the social order

"This book presents certain facts and principles of psychology which students of sociology, economics, government, law, and other sciences of human affairs need to know. Psychology cannot as yet claim to be an adequate science of human thought, feeling, and action, upon which all the social sciences rest and with which they must agree. Indeed it probably has much more to learn from them, especially from anthropology and history, than they from it. But human biology and psychology make a substantial contribution. They settle certain questions outright and turn the balance for others"--Preface.