u 4 SEX AND HEREDITY 



trades, and that the difference is not merely due to 

 different education imposed on similar material. A proper 

 discussion of this question would take us far beyond the 

 scope of these lectures, and it must suffice to mention the 

 single point, that the fact that entrance into a profession 

 is dependent upon the ability to pass intellectual tests, 

 and that success therein depends mainly on intellectual 

 capacity, excludes all markedly unintelligent persons 

 from such a profession. The exclusion of these obviously 

 raises the average intellectual capacity of the members 

 of the profession above that of these engaged in occu- 

 pations into which men of all degrees of mental capacity 

 high or low are admitted. 



This question, however, like the problem of the physi- 

 cally unfit members of the population, is capable of an 

 amount of argument quite out of place in a book of this 

 size and character, and here we must leave it, content with 

 having indicated certain practical problems arising out 

 of our study of heredity, problems which are vastly more 

 vital to the real welfare of the human race than those 

 political questions which usually absorb the energies of 

 governments. 



