vi PREFACE 



developed under the laws which have brought about 

 the evolution of the rest of the living world, the 

 human social unit has been developed under the 

 influence of a new set of forces which have had little 

 or no influence in developing the animal kingdom. In 

 doing this there will be given a sketch of the evolu- 

 tion of what we call civilization, for such a sketch 

 will show us that social evolution has been controlled 

 and guided by a new force which we call social hered- 

 ity, a force which had had almost nothing to do with 

 the evolution of the rest of the organic world, and 

 one which acts practically independently of the laws 

 which the eugenists are disclosing to view. It has 

 appeared to the author that, with all the cogency of 

 the facts presented by the eugenists, there is a side 

 of the question of human develoj^ment which they 

 are overlooking and which their readers are there- 

 fore likely to overlook ; a side which, in our opinion, 

 weighs more heavily in determining human progress 

 than the laws of inlieritance upon which eugenics is 

 based. To present this other side of the case, with- 

 out endeavoring at all to detract from the value of 

 the agitation for a better inheritance by the best 

 possible control of marriage, is the excuse for the 

 preparation of this book at the present time. 



H. W. C. 



MlDDLETOWN, CONNECTICUT, Juue, 1914. 



