238 The Inheritance of Wing Colour in Lepidoptera 



usual. The ratio of the area of the yellow class to the other two is about > 

 22: 78 (per cent.). 



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10 



Colour-units 



[1-1: 0-9] [1-2: 0-9] 



Mean colour- values of 



hybrid parents 



Fig. 13. Curve showing frequency distribution of the orange and yellow 

 colour- values of the offspring of all the hybrid {lutea x gross.) x hybrid 

 (lutea X gross.) families shown in Figs. 10, 11, and 12. 



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Colour-units 



[0-9 : 0-6J [1-4 : 1-0] 



Mean colour-value Mean colour-value 

 of gross, parents of hybrid parents 



14. (Cf. Fig. 25.) Curve showing frequency distribution of the 

 orange and yellow colour-values of the offspring from four families of 

 hybrid {lutea x gross.) x A. grossulariata. 



