14 



David Day Whitney 



individuals, each one of which produced 40 to 44 (average 421^) 

 eggs. The eggs were allowed to hatch in the dish with each 

 mother and the young daughter-females isolated soon after hatch- 

 ing. Their different sizes would indicate their relative ages and 

 thus the approximate order in which the eggs were produced. 

 The young daughter-females were isolated in lots from i to 8. 

 This manner of isolation is subject to some error but on the whole 

 gives a fairly good approximation of the truth. 



NUMBER AND ORDER OF FEMALE EGGS PRODUCED 



Diagram i Record of the egg production of 1 1 female-laying females from Table I, showing in 

 which part of the egg laying period the male-laying females were produced. Each female laid 40 to 

 44 (average 42-1-) eggs. Of the 472 daughter-females 20+ per cent were male-laying females. 



Nearly all of the male-laying females were produced among the 

 first 28 eggs laid. Only two male-laying females were produced 

 from the twenty-ninth to the forty-second laid eggs. Of the 

 daughter-females 20 + per cent were male-laying females. 



Diagram 2. This is to show the same point as Diagram i. 





° 6 



NUMEER AND ORDER OF FEMALE EGGS PRODUCED 



Diagram 2 Record of the egg production of 12 female-laying females from Table I, showing in 

 which part of the egg laying period the male-laying females were produced. Each female laid 35 to 39 

 (average 364-) eggs. Of the 441 daughter-females 16+ per cent were male-laying. 



