No. 508] HEREDITY OF HAIR COLOR IN MAN 203 



C. Heredity of Red and Brown Pigment 

 We have seen that the red series is quite independent 

 of the yellow-brown series. Clear red-haired individuals 

 lack black pigment themselves and can not transmit it to 

 their offspring. This is, at least, a priori probable ; but 

 despite careful search we have found no case of two 

 parents with clear red hair. One case of clear red and 

 dark red is given in Table I., Edw family, in which all 

 three children have red hair. We have one of dark red 

 X dark red parentage with the following remarkable 

 record (as yet unchecked). 



Dey-B I 1 3 1 4 1 dk. red dk. red. — N br. N 



We interpret this case to mean that the red is absent 

 in some children (owing to heterozygotism of the par- 

 ents) and dilute in others and here masked by black 

 pigment. 



In this table the yellow-brown series of colors predomi- 

 nates among the offspring over the reds. This we mt 

 pret to mean that, as the red parents are usually hetero- 

 zygous in the intensity of red that they bear we Have 

 approximately one half of the offspring without any \oi 

 only a slight) tendency toward red. Even when red 



