VII] THE CASE OF PAPILIO POLYTES 87 



of offspring with and without X, i.e. haK 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 $ (wild) 



' ' — I 1 I \ I 



18<J<J 10 M$? 7H?$ 26 ^(J 7M$? 26H$$ 



/ 



->M$x (J 



7 c?o" 1 2H,?? 



I I ^ I I I 



14<J(J 6//?? IM? 8(J(J 10H?$ 2Af$$ 



Families were reared from the two wild R females 

 of whom nothing was known either as to ancestry or 

 husband. The first family contained 10 Jf and 7 R 

 females. Hence the original wild mother was probably 

 iiXx and had mated with a male of the constitution 



