328 



riddle: control of sex ratio 



TABLE 5 



Breeding Records — 1914 



(St. alba cT X) 9 St. risoria 647 (young); 1913 = 18 eggs 



1st 18 ■ = 9 cf : 9; 9 2nd 18 = 8 & : 10 9 ; (1915 = 11 



11 9) 



