CROSSINGS IN MELANIUM-VIOLETS 



263 



also difficult to sro in tlu' hcij^'ht of summer. It luis therefore been 

 necessary to make notes about the flower-colour several times in 

 the summer. 



TABLE 6. Tlic segregation of the flower-colour in F2 of the 



cross 2 X 10. 



The Fo-generation of the other crosses, viz. 3 X 10 and 25 X 10 

 gave the same results as the cross 2 X 10. The number of individuals 

 being very small and notices made only in the height of summer I 

 deem it useless to report the ratios. 



TABLE 7. The inheritance of the length of the honey-guide. 



As mentioned in the above a type with the whole spur-petal of 

 a dark-yellow colour (the same as that of the honey-guide) appears 

 in Fa. It is also here due to carotin, localized in the chromatophors. 

 It is therefore close at hand to suppose that the extent of the honey- 

 guide of the parents is, at least partly, due to different factors; in F> 



