K. TOYAMA 



385 



As the figures show, crimson-coloured eggs always produced crimson- 

 eyed worms and moths and the normal ones gave dark-eyed worms and 

 moths. Both the crimson and normal-eyed moths paired inter se gave 

 the following F3 egg-batches : 



(1) Crimson-eyed moths paired inter se. 



Number of Matings 

 No. 6. 8. 15 

 No. 6. 9. U 



No. 6. 8. ( X pure crimson) IG 

 No. 6. 1. ( X pure crimson) 27 

 No. 6. 8. (x No. 6. 1) 11 

 No. 6. 2. ( X No. 7. 6) 13 

 No. 6. 9. 15 



Colour of the eggs laid 

 all orimsou-coloured eggs 



divoltine white 



Of seven crimson-eyed matings, four gave all crimson-coloured 

 eggs, while the remainder gave all divoltine white eggs which in the 

 next generation gave rise to crimson-eyed worms and moths and laid 

 all crimson-coloured eggs. We may say, therefore, that the crimson- 

 coloured characteristic is segregated from the normal-coloured ones. 

 The lineage of this series gave all crimson-coloured eggs in the succeeding 

 generations. 



(2) Normal-eyed moths inbred. 

 Eggs laid 



Back-crossing of F^ Dark-eyed Moths tuith extracted 

 Crimson-eyed Moths. 



Fi dark-eyed moths derived from the mating, $ crimson x {/" tetra- 

 voltine white, were mated with crimson-eyed males derived from the F„ 

 eggs of the mating, $ tetravoltine x </ crimson. Each mating, as the 



