THE INHERITANCE OF EA^HLY TRAITS 33 



Fig. 10. — Wavy hair; a Segumbar, female, Philippine Islands. (Lent by 

 the American Museum of Natural History.) 



who has red hair has a strong antipathy to a red-haired 

 person of the opposite sex. This testimony comes to me 

 from the father of a red-haired daughter. It is confirmed 

 by the fact that, despite prolonged inquiry among thousands 

 of families I have succeeded in obtaining only two cases 

 where both parents had red hair. Though the red was 

 not a clear red in all parents all of the 8 children had red 

 hair. If one parent only forms "red-hair" germ cells ex- 

 clusively while the other forms exclusively germ cells con- 

 taining the determiner for black pigment the offspring will 

 show no red; still less will red-haired offspring appear if 

 neither parent forms "red-hair" germ cells. Red-haired 

 offspring may come from two brown or better from glossy 

 black-haired parents provided both form red-hair germ 

 cells. In that case both dark-haired parents will probably 



