TWO PAIRS OF FEMALE TWINS 



247 



TABLE 7 

 Clutches (pairs of eggs) of greatest size disparity laid by Streptopelia risoria 



* Eggs thus marked are the first eggs in the life of the birds that produced them. 



* The purity of the female parent is questionable. 



2 Thg figures of this column, in this table and in those which follow, represent the per 

 cent of difference between the weights of the two eggs or of the two yolks. In all cases 

 the smaller egg or yolk is taken as 100 per cent. 



