vn] THE CASE OF PAPILIO POLYTES 87 



of offspring with and without X, i.e. half of his daughters 

 will be mimetic and the other half non-mimetic. With 

 a heterozygous mimetic female (UXx), which is also 

 producing germ cells with and without X in equal 

 numbers, he may be expected to give the usual result, 

 viz. dominants and recessives in the ratio 3:1; or 

 in other words mimetic and non-mimetic females in 

 the ratio 3:1. 



One of Fryer's experiments may be given here in 

 illustration of the nature of the evidence upon which 

 the above hypothesis depends. 



H ? (wild) 



H ? (wild) 



28 <J<J 10 M$Q 7 72?? 



| I 1 



26 cJ(? 7 M ?? 26 H ?? 



«JxS? 



(JXff? 



14 33 6H$? II? 



8<J(J 10 H?? 2M?? 



Families were reared from the two wild H females 

 of whom nothing was known either as to ancestry or 

 husband. The first family contained 10 M and 7 H 

 females. Hence the original wild mother was probably 

 UXx and had mated with a male of the constitution 



