12 



David Day Whitney 



TABLE VII 

 Record of the number of eggs laid by 21 sisters, of which 9 were male-laying and 12 were female- 

 laying, showing the average number of eggs produced by the male-laying females is about two times 

 as great as the average number produced by the female-laying females. 



Temperature 24" to 2^° C. 

 21 sisters 



TABLE VIII 



Record of the number of eggs laid by 14 sisters, of which 2 were male-laying and 12 were female-lay- 

 ing, showing that the average number of eggs produced by the male-laying females is nearly four 

 times as great as the average number produced by the female-laying females. 



Temperature 26° to 2g° C. 

 14 sisters 



