288 The Inheritance of Wing -Colour in Lepidoptera 



s; 50 



40 



30 



60 



10 



i c?c? 3 3 



parent parents parents 



of of of 



'20 B '20 D& '20^,20C, 



'206 '20 £ 



7 8 



Colour Units 



Fig. 6 (cf. Fig. 5). Diagram showing the percentage frequency of the black values 

 of the (J (J shown in the last figure, illustrating the segregation of the three 

 classes DD, DR and ER. 



Av. value of rustica 

 parents oi'19A,E,H 



(J parent of '19 

 (J parent of '19 D 



10 



60 70 80 



Number of Insects 

 Fig. 7 (cf. Fig. 8). Curve showing the distribution of the black values of the 

 (J (J in five families of the cross (Fi) x type. 



