Fig. 3 Six groups of cousins; in each group the parents are sibs. Solid lines 

 are females, broken lines males. The parents are indicated by squares (males) 

 and triangles (females) above the curves of their children. The fractions follow- 

 ing the numbers of the mating indicate the grades of the parents. The numbers 

 of males and females involved in the curves are given at one side. A, grand- 

 children of no. 56, in the 4th generation; B, grandchildren of 115, in the 6th 

 generation; C, grandchildren of 116, in the 6th generation; D, grandchildren of 

 143, in the 7th generation; E, grandchildren of 246, in the 10th generation; F, 

 grandchildren of 274, in the 11th generation. 



73 



