322 



Journal of Agricultural Research 



Vol. IV, No. 4 



It is interesting to note that the parents with only black and white 

 seedlings produce these colors in the ratio of 3 to i and that the seed- 

 lings of the varieties yielding only black and red are reasonably close to 

 this same ratio. 



The results when different colors are combined are given in Table III. 

 The range of color in the seedlings again emphasizes the necessity of 

 knowing more of the color composition of a variety than can be deter- 

 mined from its appearance. 



Table III. — Results of crossing grapes of different colors 



Color combinations of parents. <» 



White X dark red 6 



White X black 



Black X dark red. . 



Colors of seedlings. 



Black. 



5 



41 



100 



Purple to Medium to 

 dark red. light red. 



44 



3 

 52 



14 



3 



40 



White. 



50 

 12 



32 



o Light-red varieties were not used to an extent sufficient to make the results of value. 

 ' The reciprocal cross is included in each case. 



It would take up altogether too much space to report upon the color 

 of the progeny of all the varieties studied, but a few of the more common 

 ones are given in Table IV, in order to show the wide variation in 

 different varieties of similar color. 



Table IV. — Variation in color of pure seedlings of certain varieties of grapes 

 Parent. Pure seedlings. 



Name of variety. 



Agawam. . 

 Brighton . 

 Catawba. . 

 Champion 

 Clinton . . . 

 Concord. . 



Essex 



Hartford . 

 Hercules . 

 Isabella. . 

 Merrimac . 

 Nectar . . . 

 Ozark . . . 



Pearl 



Regal.... . 

 Worden . . 

 Wyoming. 



Color. 



Purple red 



Dark red 



Purple red 



Black 



Black 



Black 



Purple black to black. 



Black 



Black 



Black 



Black 



Black 



Black 



White 



Dark red 



Black 



Dark red 



I 

 6 



2 



13 

 15 

 40 



4 

 4 

 3 

 8 



9 



4 



16 



Purple to 

 dark red. 



Medium to 

 light red. 



15 



White. 



3 

 10 



IS 

 5 



I 



3 



In the ultimate solution of the problems of color inheritance we shall 

 probably be aided in no small degree by those who are studying the 

 subject from the standpoint of the chemistry of the various colors; thus, 



