34 HEREDITY IN RELATION TO EUGENICS 



Pig. 11. — Frizzy or kinky hair; a Soudanese male. (Lent by the American 

 Museum of Natural History from a photograph in the Philadelphia Museum.) 



have ancestors or other close relatives with red hair. Glossy 

 black hair in the parents is especially apt to produce red 

 hair in the children because the glossiness is usually due 

 to red hidden by black pigment. 



3. Hair Form 



The form of the hair varies from straight through wavy 

 and curly (Fig. 10) to kinky (Fig. 11) and woolly (Fig. 12), 

 depending largely upon the closeness of the spiral. These 

 different types of hair have a different form on cross-section; 

 L e,, the cut end of a straight hair is nearly circular while 



