A.N KAKI.Y POSSKSSOK OF TIIK LOCk 



This man is (k-sifjnated in the- pedigree chart (Fis- K') :i^ HI, 10, and is llicrcforc a son of the 

 Dr. Little who brought the trait to America. He i)assed it on to his son, with whom 

 this line stopped. In the family, however, it is definitely charted for six generations, 

 and at least twf) other families have been studied wliere the trait has been traced for six 

 generations, while in many eases a similar lock has been followed through several genera- 

 tions until lack of data forced the investigator to abandon his quest. (Fig. 8.) 



