PREFACE 



The things set forth in this little book are mat- 

 ters of fact, and not a philosophy or a set of 

 opinions. If some person does not agree, his 

 proper procedure is to find contrary facts to 

 offset those here presented. As there is an 

 ample supply of records, there is no excuse for 

 applying denunciation instead of getting the 

 facts. 



For example, my tables show that the chil- 

 dren bom to fathers less than thirty are much 

 more numerous than those born to fathers over 

 forty. If anyone doubts it, let him go to the 

 birth registry in any city, or to family geneal- 

 ogies to be found in any public library. In ex- 

 amining the pedigrees of intellectually eminent 

 men I found that those born to fathers more 

 than forty are much more numerous than those 

 bom to fathers less than thirty. The names of 

 the men in my list are given in my Control of 

 Heredity, and in my Great Men. If anyone 

 questions the results let him make up another 

 list of equally eminent men and tell us what 

 he finds. 



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