762 



POPULAR SCIENCE MONTHLY. 



prevails. Here are a few of the obstacles to be encountered. As 

 the table indicates, the countries north of the Alps have been 

 mainly studied through their school children. In the Latin half 



Relative Prequency 



OF 



BRUNEI JRAITS. 



zo -25 per cent 



of Europe adults alone are included. Secondly, it is a matter of 

 common observation that flaxen hair and blue eyes are character- 

 istic of childhood. As it has been proved that from ten to twenty 

 per cent of such blond children at maturity develop darker hair 



