10 



David Day Whitney 



IV THE RELATIVE NUMBER OF EGGS WHICH A MALE-LAYING 

 FEMALE AND A FEMALE-LAYING FEMALE PRODUCE 



It seems evident from Maupas' account of his own experiments 

 that he did not isolate each female-laying mother and each one 

 of her daughter-females but kept the female-laying mothers to- 

 gether in one dish and their daughter-females together in another 

 dish. 



If it is assumed that Maupas made no mistake in determining 

 the sex character of the eggs before they hatched, or even that he 

 allowed all eggs to hatch before he recorded their sex character, 

 his results can be easily explained. 



TABLE V 



The number of eggs laid by each of 13 sisters, of which 6 were male-laying and 7 were female-laying, 

 showing that the average number of eggs laid by each of the two kinds of females is very nearly the 

 same. 



Temperature 20° to 22° C. 

 13 sisters 



He gives no results of experiments conducted at a tempera- 

 ture midway between 14° and 28° C. but only results obtained at 

 these two extremes. The results that were obtained at 14° C. 

 may very likely be identical with those that could have been 

 obtained at a room temperature around 20° C. 



Maupas recognized the fact that male-laying females produce 

 eggs faster than female-laying females but makes no mention of 

 the number of eggs that each kind of female may produce at dif- 

 ferent temperatures. He seems to assume that they always pro- 



