Produced by Audrey Longhurst, Janet Blenkinship and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images from the Home Economics Archive: Research, Tradition and History, Albert R. Mann Library, Cornell University) APPLIED EUGENICS BY PAUL POPENOE EDITOR OF THE JOURNAL OF HEREDITY (ORGAN OF THE AMERICAN GENETIC ASSOCIATION), WASHINGTON, D. C. AND ROSWELL HILL JOHNSON PROFESSOR IN THE UNIVERSITY OF PITTSBURG THE MACMILLAN COMPANY NEW YORK . BOSTON . CHICAGO . DALLAS ATLANTA - SAN FRANCISCO MACMILLAN & CO., LIMITED LONDON . BOMBAY . CALCUTTA MELBOURNE THE MACMILLAN CO. OF CANADA, LTD. TORONTO 1918 _All rights reserved_ COPYRIGHT, 1918, BY THE MACMILLAN COMPANY Set up and electrotyped. Published October, 1918. PREFACE The science of eugenics consists of a foundation of biology and a superstructure of sociology. Galton, its founder, emphasized both parts in due proportion. Until recently, however, most sociologists have been either indifferent or hostile to eugenics, and the science has been left for the most part in the hands of biologists, who have naturally worked most on the foundations and neglected the superstructure. Although we are not disposed to minimize the importance of the biological part, we think it desirable that the means of applying the biological principles should be more carefully studied. The reader of this book will, consequently, find only a summary explanation of the mechanism of inheritance. Emphasis has rather been laid on the practical means by which society may encourage the reproduction of superior persons and discourage that of inferiors.