VII] THE CASE OF PAPILIO POLYTES 87 



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

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

 a heterozygous mimetic female (iiXx), 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?(wad) 



1 ' — I 1 



-I , 



26,J,J 7M?? 26 H$? 



/, 



->ilf $X^ 



7 5<?. 



S^H^ 



12 H?? 



^XH? 



I i I 



14<J,J 6ff$9 IM? 



I 1 1 



8SS 10H?9 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 

 iiXx and had mated with a male of the constitution 



