REPORT OP COMMITTEE ON PUBLICATION 



37 



Inheritance of Sex. 



Fifty-one pure male seedlings have been produced at the station from 

 known parents. A study of these makes it seem reasonable to assume that 

 hermaphrodites pollinated by pure males will give both types in equal num- 

 ber, while hermaphrodites pollinated by hermaphrodites give only herma- 

 phrodites. 



Skin Color. 



It is not easy to differentiate grape colors since they grade from the 

 so-called "white" through many shades of red and purple to black. This wide 

 range has greatly complicated the problem of determining the color composi- 

 tion of the various varieties. The several thousand seedlings which have 

 been fruited have made possible the formulation of but two general laws: 

 (1) White is a pure color and (2) it is recessive to both black and red. 



Tables I, II and III give the results from the various color combinations 

 which have been made and show what wide variations have been secured even 

 from varieties of the same color. A careful study of the varieties is being 

 continued to bring order out of these conflicting results. 



Table I Crosses of Similar Colors. 



Table II Color Groups of Pure Seedlings of Black Varieties. 



Color of Seedlings 



Table III Combination of Colors. 



Color of Seedlings. 



*Includes also the reciprocal cross. 



t Light red varieties were not used to an extent sufficient to make the 

 results of value. 



